@article{Rout2018,
author = "Smruti Sourav Rout and Gerhard W{\"o}rner",
abstract = "Compositional zoning and exsolution patterns of alkali feldspars in carbonatite-bearing cognate syenites from the 6.3 km3 (D.R.E) phonolitic Laacher See Tephra (LST) deposit in western Germany (12.9 ka) are reported. These rocks represent the cooler outer portion and crystal-rich products of a cooling magma reservoir at upper crustal levels. Major and trace-element difference between cores and rims in sanidine crystals represent two generations of crystal growth separated by unmixing of a carbonate melt. Trace-element differences measured by LA--ICP--MS are in accordance with silicate--carbonate unmixing. Across the core--rim boundary, we extracted gray-scale profiles from multiple accumulations of back-scattered electron images. Gray scales directly represent K/Na ratios owing to low concentrations of Ba and Sr (<{\thinspace}30 ppm). Diffusion gradients are modeled to solve for temperature using known pre-eruptive U--Th zircon ages (0--20 ky) of each sample (Schmitt et al., J Petrol 51:1053--1085, 2010). Estimated temperatures range from 630 {\textdegree}C to 670 {\textdegree}C. For the exsolution boundaries, a diffusive homogenization model is constrained by the solvus temperature of {\textasciitilde} 712{\_}725 {\textdegree}C and gives short time scales of only 15--50 days. Based on our results, we present a model for the temperature--time history of these rocks. The model also constrains the thermal variation across the cooling crystal-rich carapace of the magma reservoir over 20 ka and suggests a thermal reactivation of cumulates, the cooling carapace, and probably the entire system only a few years prior to the explosive eruption of the remaining molten core of the phonolitic magma reservoir.",
day = "23",
doi = "10.1007/s00410-018-1522-x",
issn = "1432-0967",
journal = "Contributions to Mineralogy and Petrology",
month = "Oct",
number = "11",
pages = "95",
title = "{Z}oning and exsolution in alkali feldspars from {L}aacher {S}ee volcano ({W}estern {G}ermany): constraints on temperature history prior to eruption",
url = "https://doi.org/10.1007/s00410-018-1522-x",
volume = "173",
year = "2018",
}


@article{Schaefer2018,
author = "Bruce Schaefer and John Adam and Mitchell Gerdes and Sandra Piazolo and Simon Turner and Helen Williams and Janne Blichert-Toft and Xiao-Ming Liu and Rene Maury",
abstract = "Island arcs provide insights into the origin and recycling of continental crust, but questions remain concerning source metasomatism, the depth of differentiation, the potential role of amphibole fractionation, and the time scales involved. Basaltic andesites on Batan Island (Philippines) contain >=150 Ma peridotite fragments encased in hornblendite and gabbroic rinds produced via melt-rock reaction. The peridotites have some of the lightest d7Li and d57Fe values yet measured in mantle rocks. These values are too fractionated to have been created solely by equilibrium partial melting and thus require a combination of melt depletion and slab fluid addition and may be derived from diffusion-modified melt channel wall rocks. Stable isotope signals are easily modified by diffusive equilibration between peridotite and host magma, so the preservation of light d7Li and d57Fe here suggests magma ascent rates of {\textasciitilde}10 km yr-1. We show that melt-wall rock reactions at {\textasciitilde}25-30 km depth led to the crystallization of amphibole ({\textpm} plagioclase) followed by gabbroic fractionation at {\textasciitilde}7 km depth. The former provides a location and mechanism for the "cryptic" amphibole fractionation observed in these and perhaps many other arc lavas and may obviate the requirement for delamination of cumulates.",
day = "27",
doi = "10.1130/G45359.1",
issn = "0091-7613",
journal = "Geology",
month = "Sep",
number = "11",
pages = "947-950",
title = "{S}ub-arc xenolith {F}e-{L}i-{P}b isotopes and textures tell tales of their journey through the mantle wedge and crust",
url = "https://dx.doi.org/10.1130/G45359.1",
volume = "46",
year = "2018",
}


@article{Wörner2018,
author = "Gerhard W{\"o}rner and Mirian Mamani and Magdalena Blum-Oeste",
abstract = "Active continental margins are shaped by subduction-related magmatism, and the Central Andes of South America are a prime example. The Central Andean orogen has evolved over the past 25 My via magmas ascending from the mantle and interacting with increasingly thickened continental crust. This process is reflected in the volumes and compositional variations of the magmas that erupt at the surface. These compositional variations can be traced in time and space, and, herein, we provide explanations for their cause and explore the nature of the Central Andes transcrustal magma systems that feed the iconic stratovolcanoes today.",
day = "01",
doi = "10.2138/gselements.14.4.237",
issn = "1811-5209",
journal = "Elements",
month = "Aug",
number = "4",
pages = "237-244",
title = "{M}agmatism in the {C}entral {A}ndes",
url = "https://dx.doi.org/10.2138/gselements.14.4.237",
volume = "14",
year = "2018",
}


@article{Hawellek2018,
author = "Thelonius Hawellek and Jan Hubert and Sandra Hischke and Matthias Krause and Jessica Bertrand and Burkhard C. Schmidt and Andreas Kronz and Klaus P\"uschel and Wolfgang R\"uther and Andreas Niemeier",
abstract = "Meniscal calcification is considered to play a relevant role in the pathogenesis of osteoarthritis of the knee. Little is known about the biology of acetabular labral disease and its importance in hip pathology. Here, we analyze for the first time the calcification of the acetabular labrum of the hip (ALH) and its relation to hip cartilage degeneration.",
day = "30",
doi = "10.1186/s13075-018-1595-y",
issn = "1478-6362",
journal = "Arthritis Research {{\&}} Therapy",
month = "May",
number = "1",
pages = "104",
title = "{C}alcification of the acetabular labrum of the hip: prevalence in the general population and relation to hip articular cartilage and fibrocartilage degeneration",
url = "https://doi.org/10.1186/s13075-018-1595-y",
volume = "20",
year = "2018",
}


@book{WoernerG201809,
author = "Georg August and Gerhard W{\"o}rner",
month = "09",
title = "{C}ontinental arc magmatism on thick, old and hot crust: {G}eology, volcanology and petrology along a w-e transect from {A}rica to {V}olcan {T}aapaca and {P}arinacota. {F}ield {G}uide {SOTA} 7, {S}ept. 9-15, 2018",
year = "2018",
}


@article{10.2138/gselements.14.4.286,
author = "Gerhard W{\"o}rner",
abstract = "While working on extinct volcanoes in Germany, I always wanted to see Hawaii. This dream came true in 1984 when I was on my way to study volcanoes in Antarctica when we passed through Hawaii … and I got the thrill of seeing Pu‘u ‘O‘o erupt. Later, over a beer, I was telling my friend, Russ Harmon, how my fieldwork adventures had fulfilled a long-held dream. “So, what's your next dream?”, he asked. “I want to work on the volcanoes of the Atacama in South America”, was my answer, not realizing that he and his colleagues were planning a field campaign to work on Parinacota Volcano in northern Chile the next year. I was invited to join.",
doi = "10.2138/gselements.14.4.286",
issn = "1811-5209",
journal = "Elements",
month = "08",
number = "4",
pages = "286-287",
title = "{W}hat's {Y}our {N}ext {D}ream?",
url = "https://dx.doi.org/10.2138/gselements.14.4.286",
volume = "14",
year = "2018",
}


@article{Zhang580,
author = "Hongbin Zhang and Michael L. Griffiths and John C. H. Chiang and Wenwen Kong and Shitou Wu and Alyssa Atwood and Junhua Huang and Hai Cheng and Youfeng Ning and Shucheng Xie",
abstract = "What exactly does the oxygen isotopic composition of speleothems tell us about the East Asian monsoon? They provide magnificent, detailed records of hydroclimate, but precisely what aspects of hydroclimate they record is unclear. Zhang et al. present data from two speleothems from central eastern China for the period from 21,000 to 10,000 years ago and suggest that the cause of the oxygen isotopic variability that they observe is more complex than simple changes in monsoon strength or intensity (see the Perspective by McGee). Alternatively, this variation may reflect the lengths of various phases of the monsoon and the regional heterogeneity of the East Asian hydroclimate.Science, this issue p. 580; see also p. 518Speleothem oxygen isotope records have revolutionized our understanding of the paleo East Asian monsoon, yet there is fundamental disagreement on what they represent in terms of the hydroclimate changes. We report a multiproxy speleothem record of monsoon evolution during the last deglaciation from the middle Yangtze region, which indicates a wetter central eastern China during North Atlantic cooling episodes, despite the oxygen isotopic record suggesting a weaker monsoon. We show that this apparent contradiction can be resolved if the changes are interpreted as a lengthening of the Meiyu rains and shortened post-Meiyu stage, in accordance with a recent hypothesis. Model simulations support this interpretation and further reveal the role of the westerlies in communicating the North Atlantic influence to the East Asian climate.",
doi = "10.1126/science.aat9393",
issn = "0036-8075",
journal = "Science",
number = "6414",
pages = "580--583",
publisher = "American Association for the Advancement of Science",
title = "{E}ast {A}sian hydroclimate modulated by the position of the westerlies during {T}ermination {I}",
url = "http://science.sciencemag.org/content/362/6414/580",
volume = "362",
year = "2018",
}


@article{doi:10.1111/ggr.12230,
author = "Shitou Wu and Volker Karius and Burkhard C. Schmidt and Klaus Simon and Gerhard W{\"o}rner",
abstract = "Two sample preparation techniques (ultrafine powder pellet and flux-free fusion glass) for LA-ICP-MS bulk analysis of granitoids were compared. Ultrafine powder particles produced by wet milling were characterised as d50: ~ 1.0 μm, d90: ~ 5.0 μm. Agate abrasion (balls and vial) during wet milling affects only SiO2 measurements and is negligible for other elements. For the flux-free fusion glass, a second grinding of the initial fused glass and re-melting were necessary to produce compositionally homogeneous glasses. Nickel and Cu can be contaminated during the fusion procedure, and Sn and Pb were depleted after the melting process. The homogeneity of fusion glasses was comparable to that of MPI-DING glasses, while the powder pellets were less homogeneous. This heterogeneity is ascribed to large (up to 10 μm) crystal fragments (e.g., biotite) persisting in powders even after 45 min of milling. For most elements of interest, both preparation techniques give reliable LA-ICP-MS results of granitoid reference materials within 10\% of the reference values. Thus, we can recommend both techniques to avoid common problems associated with acid dissolution ICP-MS. For high-precision measurements (especially Zr, Hf, Th and U), the flux-free fusion glass technique is a better choice than ultrafine powder pellets.",
doi = "10.1111/ggr.12230",
journal = "Geostandards and Geoanalytical Research",
keywords = "LA-ICP-MS, granitoid, ultrafine powder pellet, flux-free fusion, bulk analysis, wet milling",
number = "4",
pages = "575-591",
title = "{C}omparison of {U}ltrafine {P}owder {P}ellet and {F}lux-free {F}usion {G}lass for {B}ulk {A}nalysis of {G}ranitoids by {L}aser {A}blation-{I}nductively {C}oupled {P}lasma-{M}ass {S}pectrometry",
url = "https://onlinelibrary.wiley.com/doi/abs/10.1111/ggr.12230",
volume = "42",
year = "2018",
}


@article{WoernerG201808,
author = "Gerhard W{\"o}rner and Taylor Schildgen and Martin Reich",
doi = "10.2138/gselements.14.4.225",
journal = "Elements",
month = "08",
pages = "225-230",
title = "{T}he {C}entral {A}ndes: {E}lements of an {E}xtreme {L}and",
volume = "14",
year = "2018",
}


@article{WilliamsS201807,
author = "Siobhan Williams and Jochen Halfar and Thomas Zack and Steffen Hetzinger and Martin Blicher and Thomas Juul-Pedersen and Andreas Kronz and Brice No{\"e}l and Van den Broeke, Michiel and W.J. Berg",
doi = "10.1029/2018JG004385",
journal = "Journal of Geophysical Research: Biogeosciences",
month = "07",
title = "{C}oralline {A}lgae {A}rchive {F}jord {S}urface {W}ater {T}emperatures in {S}outhwest {G}reenland",
year = "2018",
}


@article{bg-15-5745-2018,
author = "S. Williams and W. Adey and J. Halfar and Andreas Kronz and P. Gagnon and D. B{\'e}langer and M. Nash",
doi = "10.5194/bg-15-5745-2018",
journal = "Biogeosciences",
number = "19",
pages = "5745--5759",
title = "{E}ffects of light and temperature on {M}g uptake, growth, and calcification in
the proxy climate archive \textit{C}lathromorphum \textitcompactum",
url = "https://www.biogeosciences.net/15/5745/2018/",
volume = "15",
year = "2018",
}


@article{NEKRYLOV2018212,
author = "Nikolai Nekrylov and Maxim V. Portnyagin and Vadim S. Kamenetsky and Nikita L. Mironov and Tatiana G. Churikova and Pavel Yu. Plechov and Adam Abersteiner and Natalia V. Gorbach and Boris N. Gordeychik and Stepan P. Krasheninnikov and Daria P. Tobelko and Maria Yu. Shur and Sofia A. Tetroeva and Anna O. Volynets and Kaj Hoernle and Gerhard W{\"o}rner",
abstract = "The Kamchatka volcanic arc (Russia) is one of best-studied, but most complex tectonic margins on Earth, with an extensive geologic history extending back to the Late Cretaceous. Unlike many other subduction zones, primitive basalts with Mg# > 65 are abundant in Kamchatka, thereby allowing characterization of the mantle source through compositional analyses of near-liquidus minerals in the rocks. In this paper, we present a comprehensive dataset on the composition of Cr-spinel inclusions in olivine for all main Late Quaternary volcanic zones in Kamchatka, comprising 1604 analyses of spinel inclusions and their host-olivine in 104 samples from 30 volcanic complexes (single volcanoes and volcanic fields). The studied rocks are basalts, basaltic andesites and high-Mg andesites, which cover the whole compositional range of the primitive Late Quaternary volcanic rocks in Kamchatka. The spinel composition shows large variability. Spinel inclusions with the lowest Cr# and Fe3+/Fe2+ ratios were found in basalts from Sredinny Range and Northern Kamchatka, whereas the most Cr-rich and oxidized spinel inclusions occur in basalts and high-Mg andesites from the Central Kamchatka Depression. Intermediate Cr-spinel compositions characterize the Eastern Volcanic Belt of Kamchatka. The compositions of olivine-spinel pairs were used to quantify the oxidation state of parental Kamchatka magmas and the degree of partial mantle melting. The redox conditions recorded in spinel compositions range from ΔQFM = +0.7 to +3.7. ΔQFM for spinel from the Sredinny Range and Northern Kamchatka correlates with a number of whole-rock proxies for the involvement of slab-derived components (e.g., La/Nb and Ba/La), which suggests a coupling between mantle oxidation state and slab-derived fluid/melt metasomatism. These correlations were not observed in frontal Kamchatka volcanoes with the highest estimated ΔQFM, which possibly indicates buffering of the mantle oxidation state by sulfur. The estimated degrees of partial mantle melting range from 8 to >20% for Kamchatka volcanoes. Spinel from the Central Kamchatka Depression has the highest Cr# and could crystallize from magmas generated from the most depleted sources. In contrast to the Eastern Volcanic Belt, spinel Cr# and the inferred degrees of melting in the Central Kamchatka Depression do not correlate with spinel TiO2 content. The apparent decoupling between the proxies of mantle depletion in the CKD spinel is interpreted to reflect refertilization of the CKD mantle by oxidized Ti-rich slab- or mantle lithosphere-derived melts near the northern edge of the subducting Pacific Plate. This study demonstrates that the composition of Cr-spinel in volcanic rocks in combination with bulk-rock compositions can be a powerful tool to map regional variations of the mantle source depletion, oxidation state, and involvement of various slab-derived components in island-arc magmatism.",
doi = "https://doi.org/10.1016/j.lithos.2018.10.011",
issn = "0024-4937",
journal = "Lithos",
keywords = "Cr-spinel, Olivine, Kamchatka, Redox conditions, Mantle wedge",
pages = "212 - 224",
title = "{C}hromium spinel in {L}ate {Q}uaternary volcanic rocks from {K}amchatka: {I}mplications for spatial compositional variability of subarc mantle and its oxidation state",
url = "http://www.sciencedirect.com/science/article/pii/S0024493718303761",
volume = "322",
year = "2018",
}


@article{doi:10.1111/ggr.12239,
author = "Lutz Nasdala and Fernando Corfu and Blair Schoene and Simon R. Tapster and Corey J. Wall and Mark D. Schmitz and Maria Ovtcharova and Urs Schaltegger and Allen K. Kennedy and Andreas Kronz and Peter W. Reiners and Yue-Heng Yang and Fu-Yuan Wu and Sarah E. M. Gain and William L. Griffin and Dawid Szymanowski and Chutimun Chanmuang N. and Martin Ende and John W. Valley and Michael J. Spicuzza and Bhuwadol Wanthanachaisaeng and Gerald Giester",
abstract = "Here, we document a detailed characterisation of two zircon gemstones, GZ7 and GZ8. Both stones had the same mass at 19.2 carats (3.84 g) each; both came from placer deposits in the Ratnapura district, Sri Lanka. The U-Pb data are in both cases concordant within the uncertainties of decay constants and yield weighted mean 206Pb/238U ages (95\% confidence uncertainty) of 530.26 Ma ± 0.05 Ma (GZ7) and 543.92 Ma ± 0.06 Ma (GZ8). Neither GZ7 nor GZ8 have been subjected to any gem enhancement by heating. Structure-related parameters correspond well with the calculated alpha doses of 1.48 × 1018 g−1 (GZ7) and 2.53 × 1018 g−1 (GZ8), respectively, and the (U-Th)/He ages of 438 Ma ± 3 Ma (2s) for GZ7 and 426 Ma ± 9 Ma (2s) for GZ8 are typical of unheated zircon from Sri Lanka. The mean U mass fractions are 680 μg g−1 (GZ7) and 1305 μg g−1 (GZ8). The two zircon samples are proposed as reference materials for SIMS (secondary ion mass spectrometry) U-Pb geochronology. In addition, GZ7 (Ti mass fractions 25.08 μg g−1 ± 0.18 μg g−1; 95\% confidence uncertainty) may prove useful as reference material for Ti-in-zircon temperature estimates.",
doi = "10.1111/ggr.12239",
journal = "Geostandards and Geoanalytical Research",
keywords = "zircon, reference material, SIMS, U-Pb geochronology, Ti-in-zircon geothermometry",
number = "4",
pages = "431-457",
title = "{GZ}7 and {GZ}8 – {T}wo {Z}ircon {R}eference {M}aterials for {SIMS} {U}-{P}b {G}eochronolo",
url = "https://onlinelibrary.wiley.com/doi/abs/10.1111/ggr.12239",
volume = "42",
year = "2018",
}


@article{LIU2018,
author = "Haiyang Liu and Yilin Xiao and van den Kerkhof, Alfons and Yangyang Wang and Lingsen Zeng and Haihao Guo",
abstract = "The Sumdo metamorphic belt, located in the Lhasa terrane of Tibet, is a key area for unraveling the Paleo-Tethys evolution. In order to identify the fluid evolution in oceanic subduction zones, eclogite from the Sumdo metamorphic belt, has been investigated in a combined study of petrography, mineral chemistry, fluid inclusions and oxygen isotopes. On the basis of petrography and mineral chemistry, two kinds of garnet were distinguished. The core part of Grt-I shows increasing grossular content and contains prograde mineral inclusions, suggesting that it grew during prograde metamorphism, while the rim of Grt-I shows varying grossular and pyrope contents, representing subsequent overgrowth. Grt-II displays a composition comparable with the outermost part of Grt-I, indicating that Grt-II grew at the peak or initial retrograde stage. Garnet trace element zoning patterns and P-T estimates suggest that the Sumdo eclogite experienced a heating stage during an initial exhumation after the peak metamorphic event. Based on textural criteria and host minerals, three types of fluid inclusions were distinguished: Type-I are primary NaCl dominated intermediate to high-salinity (10–22 wt% NaCl) fluid inclusions hosted by omphacite, which were most likely released during dehydration of the subducting oceanic crust and reflect the composition of eclogite-facies fluids; Type-II are defined as primary low-salinity (1–6 wt% NaCl) fluid inclusions hosted by epidote/clinozoisite, representing fluids that evolved towards low-salinity during uplift; Type-III are secondary low-salinity (0–7 wt% NaCl) fluid inclusions hosted by matrix quartz (i.e., minerals other than the mineral inclusions) and rarely by omphacite and must have formed at a very late stage. In addition, the eclogite displays δ18O values (δ18O = +5.0 to +8.9‰) similar to its protolith, low-temperature altered oceanic crust (δ18O = +4.9 to +12.7‰). The equilibrium oxygen isotope fractionations (Δ18OQtz-Min) between quartz and garnet/omphacite suggest isotopic equilibrium and a closed fluid system during eclogite facies metamorphism. Our data indicate that the Sumdo eclogite experienced “hot” exhumation, during which large amounts of fluids were released by dehydration. Fluids in the Sumdo eclogite were typically aqueous fluids of varying salinities and now preserved as fluid inclusions in HP metamorphic minerals. In comparison with continental subduction zones, we confirm previous conclusion that the fluid regime in oceanic subduction zones is relatively simple (i.e. mainly NaCl bearing brines) with seawater-altered slabs as the dominant source.",
doi = "https://doi.org/10.1016/j.jseaes.2018.09.013",
issn = "1367-9120",
journal = "Journal of Asian Earth Sciences",
keywords = "Fluid inclusions, Garnet, Exhumation-heating, P-T-t-fluid path, Oxygen isotopes, Tibet",
title = "{M}etamorphism and fluid evolution of the {S}umdo eclogite, {T}ibet: {C}onstraints from mineral chemistry, fluid inclusions and oxygen isotopes",
url = "http://www.sciencedirect.com/science/article/pii/S1367912018304048",
year = "2018",
}


@article{egqsj-67-1-2018,
author = "B. Klaes and R. Kilian and Gerhard W{\"o}rner and S. Thiele-Bruhn and H. W. Arz",
doi = "10.5194/egqsj-67-1-2018",
journal = "E{\&}G Quaternary Science Journal",
number = "1",
pages = "1--6",
title = "{M}iddle to {L}ate {H}olocene mobilization of {DOC}-bound {P}b and {Y} in the
{M}agellanic moorlands (53{\degree}\,{S}) as a function of sea spray
fertilization, climate variations and volcanic fallout? {A} preliminary
report",
url = "https://www.eg-quaternary-sci-j.net/67/1/2018/",
volume = "67",
year = "2018",
}


@article{Harmon201810,
author = "Russell Harmon and Chandra Throckmorton and Hark TT and Jennifer Gottfried and Gerhard W{\"o}rner and Harpp K and Leslie Collins",
journal = "Social Science Japan Journal",
month = "10",
pages = "112-127",
title = "{L}aser-induced breakdown spectroscopy ({LIBS}) – {A} tool for archeological studies: {P}art {I} – {D}iscriminating volcanic regions and centers using multivariate statistical analsysis of {LIBS} spectral signat",
volume = "98",
year = "2018",
}


@article{van den kerkhof_sosa_oberthür_melcher_fusswinkel_kronz_simon_dunkl_2018,
author = "van den Kerkhof, Alfons M. and Graciela M. Sosa and Thomas Oberth{\"u}r and Frank Melcher and Tobias Fusswinkel and Andreas Kronz and Klaus Simon and Istv{\'a}n Dunkl",
doi = "10.1180/mgm.2018.80",
journal = "Mineralogical Magazine",
number = "3",
pages = "751–778",
publisher = "Cambridge University Press",
title = "{T}he hydrothermal {W}aterberg platinum deposit, {M}ookgophong ({N}aboomspruit), {S}outh {A}frica. {P}art {II}: {Q}uartz chemistry, fluid inclusions and geochronology",
volume = "82",
year = "2018",
}


@article{IOVINE2018199,
author = "Raffaella Silvia Iovine and Fabio Carmine Mazzeo and Gerhard W{\"o}rner and Carlo Pelullo and Gianluca Cirillo and Ilenia Arienzo and Andreas Pack and Massimo D'Antonio",
abstract = "The origin of large variations in stable and radiogenic isotope compositions of magmas erupted from the Neapolitan volcanoes, including Somma-Vesuvius and Campi Flegrei (Southern Italy), has always been contentious. Indeed, the role and relative importance of sediment subduction versus crustal assimilation to explain the chemical and isotopic variations of the erupted magmas remain unclear. Isotopic disequilibrium between minerals and their host indicate that bulk rock analyses are incapable of constraining the isotopic composition of the source. Therefore, we use isotopic (87Sr/86Sr, 18O/16O and 17O/16O) data on separated minerals (feldspar, clinopyroxene and olivine phenocrysts) from pyroclastic successions and lava flows of the Neapolitan volcanic area (Phlegrean Volcanic District and Somma-Vesuvius complex) to better constrain magmatic oxygen and strontium isotope ratios. Magmatic values recalculated from δ18O of olivine and clinopyroxene phenocrysts range from typical mantle values of 5.2‰ to almost 9‰ relative to SMOW. These compositions are very different from those of typical mantle sources. In order to assess the degree of magma evolution from which these minerals formed, the Mg# of clinopyroxene and olivine were converted into host melt Mg#, resulting in the range 44 to 76. Simple assimilation of silicic crustal rocks is difficult to reconcile with the mafic nature of these estimated host magma compositions. This indicates that some mafic, mantle-derived magmas, having unusually heavy oxygen isotope (up to ~9‰) and high Sr isotope compositions (0.7050 to 0.7085), must exist. Crustal assimilation of carbonates can be excluded by the lack of a link between isotopes and major and trace element signatures. Assimilation of either Hercynian-like crust or altered pyroclastic rocks, however, cannot be ruled out completely. However, assimilation of partial melts from a Hercynian-like crust would have to be ~12% and ~21% to explain the heavy oxygen isotope values of Campi Flegrei and Somma-Vesuvius, respectively. Such degrees of assimilation are unlikely since the magmas are either too mafic or too alkaline to be consistent with such high proportion of crustal components. Other, less mafic Campi Flegrei, Somma-Vesuvius and Ischia magmas with more typical mantle oxygen isotopes, have been possibly generated in a mantle source affected by minor contamination by pelagic and carbonate sediments and subsequent assimilation of Hercynian-like crust. Sr-O mixing models indicate that such magmas were derived from a mantle source that was contaminated by up to 10% of a 1:1 mixture of pelagic and carbonate sediments. These findings together demonstrate the highly complex and varied magma sources in the Campania volcanic district. Triple oxygen isotope variations (Δ17O), based on measurements of both 18O/16O and 17O/16O ratios in potential assimilants are in agreement with these conclusions.",
doi = "https://doi.org/10.1016/j.lithos.2018.07.009",
issn = "0024-4937",
journal = "Lithos",
keywords = "Neapolitan volcanoes, Radiogenic and stable isotopes, ΔO variations, Mantle enrichment, Crustal assimilation",
pages = "199 - 211",
title = "{C}oupled δ18{O}-δ17{O} and 87{S}r/86{S}r isotope compositions suggest a radiogenic and 18{O}-enriched magma source for {N}eapolitan volcanoes ({S}outhern {I}tal",
url = "http://www.sciencedirect.com/science/article/pii/S002449371830241X",
volume = "316-317",
year = "2018",
}


@article{HUANG201885,
author = "Jian Huang and Xing-Chao Zhang and Sha Chen and Limen Tang and Gerhard W{\"o}rner and Huimin Yu and Fang Huang",
abstract = "Geochemical characteristics of arc magmas reflect incorporation of subducted materials to their mantle wedge sources in subduction zones. Subduction component addition has been proposed to modify the Zn isotopic budget of arc magmas. However, the lack of a systematic study on Zn isotopic compositions of arc magmas hampers a better understanding of Zn isotope behavior in subduction zones. To address this issue, we have determined Zn isotopic compositions of 37 well-characterized arc rocks from the Kamchatka and Central-Eastern Aleutian arcs. These rocks record contributions of fluids and melts derived from altered oceanic crust (AOC) without overprints of sediment melts and thus allow focus on the potential effects of AOC-derived fluids and melts on the Zn isotopic budget of arc magmas. For comparison, nine basalts from the Gakkel, Mid-Atlantic and Southeast Indian Ridges, and the Lau Basin and nine adakites from Central America were also analyzed. Rocks from the Kamchatka-Aleutian arcs have δ66Zn from 0.16 to 0.31‰ that are mostly similar to those of mid-ocean ridge basalts (MORBs), back-arc basin basalts (BABBs), and adakites (δ66Zn = 0.23–0.33‰), but a significant number of arc samples also display δ66Zn higher than that of the depleted MORB-type mantle (DMM), indicating Zn isotope fractionation during magmatic processes and/or modifications of the mantle wedge Zn isotopic budget by incorporation of AOC-derived fluids and melts. The lack of correlations of δ66Zn with geochemical indicators of magma differentiation (e.g., MgO, SiO2, and Zn/FeT) indicate that fractionation of olivine, pyroxene, and magnetite has a limited effect on the Zn isotopic compositions of arc magmas. Even though the mantle sources of arc rocks investigated here are strongly affected by AOC-derived fluids and melts that have higher δ66Zn compared to the DMM, we observe no systematic variations of δ66Zn with indicators of subduction components (e.g., Ba/La, Ba/Th, Sr/Y, Hf/Lu and 87Sr/86Sr). This suggests that insignificant transport of Zn from the subducting Pacific slab to the Kamchatka and Central-Eastern Aleutian mantle wedge. Our model calculations suggest that the observed offset of δ66Zn between the mantle and arc magmas can be attributed to isotope fractionation during partial melting with no need for contributions from subduction components.",
doi = "https://doi.org/10.1016/j.gca.2018.07.012",
issn = "0016-7037",
journal = "Geochimica et Cosmochimica Acta",
keywords = "Zn isotopes, Arc magmas, Subduction components, Partial melting, Magma differentiation",
pages = "85 - 101",
title = "{Z}inc isotopic systematics of {K}amchatka-{A}leutian arc magmas controlled by mantle melting",
url = "http://www.sciencedirect.com/science/article/pii/S0016703718303880",
volume = "238",
year = "2018",
}


@article{Gordeychik2018,
author = "Boris Gordeychik and Tatiana Churikova and Andreas Kronz and Caren Sundermeyer and Alexander Simakin and Gerhard W{\"o}rner",
abstract = "Complex core-rim zoning of Mg-Fe-Ni-Ca-Cr-Al-P in high-Mg olivine crystals from a tuff ring of Shiveluch volcano, Kamchatka, enables reconstruction of the entire olivine crystallization history from mantle conditions to eruption. Bell-shaped Fo86-92 and Ni profiles in crystal cores were formed by diffusion after mixing with evolved magma. Diffusion proceeded to the centres of crystals and completely equilibrated Fo and Ni in some crystals. Diffusion times extracted from Fo and Ni core profiles range from 100 to 2000 days. During subsequent mixing with mafic mantle-equilibrated melt, the cores were partially dissolved and overgrown by Fo90 olivine. Times extracted from Fo and Ni diffusion profiles across the resorption interface between the core and its overgrowth range within 1-10 days, which corresponds to the time of magma ascent to the surface. The overgrowth shows identical smooth Fo-Ni decreasing zoning patterns for all crystals towards the margin, indicating that all crystals shared the same growth history after last mixing event prior to eruption. At the same time, Ca, and to an even greater extent Cr, Al, and P have oscillatory growth patterns in the crystals overgrowth. Our data show that magma ascent can be extremely short during maar/tuff ring eruption.",
doi = "10.1038/s41598-018-30133-1",
issn = "2045-2322",
journal = "Scientific Reports",
number = "1",
pages = "11775",
title = "{G}rowth of, and diffusion in, olivine in ultra-fast ascending basalt magmas from {S}hiveluch volcano",
url = "https://doi.org/10.1038/s41598-018-30133-1",
volume = "8",
year = "2018",
}


@article{HETZINGER201896,
author = "S. Hetzinger and J. Halfar and Andreas Kronz and Klaus Simon and W.H. Adey and R.S. Steneck",
abstract = "The potential of crustose coralline algae as high-resolution archives of past ocean variability in mid- to high-latitudes has only recently been recognized. Few comparisons of coralline algal proxies, such as temperature-dependent algal magnesium to calcium (Mg/Ca) ratios, with in situ-measured surface ocean data exist, even rarer are well replicated records from individual sites. We present Mg/Ca records from nine coralline algal specimens (Clathromorphum compactum) from a single site in the Gulf of Maine, North Atlantic. Sections from algal mounds were analyzed using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) yielding individual Mg/Ca records of up to 30 years in length. We first test intra- and intersample signal replication and show that algal Mg/Ca ratios are reproducible along several transects within individual sample specimens and between different samples from the same study site. In addition, LA-ICP-MS-derived Mg/Ca ratios are compared to electron microprobe (EMP) analyzed data on the longest-lived specimens and were found to be statistically commensurable. Second, we evaluate whether relationships between algal-based SST reconstructions and in situ temperature data can be improved by averaging Mg/Ca records from multiple algal specimens (intersample averages). We found that intersample averages yield stronger relationships to sea surface temperature (SST) data than Mg/Ca records derived from individual samples alone. Thus, Mg/Ca-based paleotemperature reconstructions from coralline algae can benefit from using multiple samples per site, and can expand temperature proxy precision from seasonal to monthly.",
doi = "https://doi.org/10.1016/j.gca.2017.09.044",
issn = "0016-7037",
journal = "Geochimica et Cosmochimica Acta",
keywords = "Coralline algae, Sea surface temperature, Calibration, Paleotemperature",
pages = "96 - 109",
title = "{R}eproducibility of {C}lathromorphum compactum coralline algal {M}g/{C}a ratios and comparison to high-resolution sea surface temperature data",
url = "http://www.sciencedirect.com/science/article/pii/S0016703717306336",
volume = "220",
year = "2018",
}


@article{Germinario2017,
author = "Luigi Germinario and Siegfried Siegesmund and Lara Maritan and Klaus Simon and Claudio Mazzoli",
abstract = "Decay of trachyte used as building stone in urban environment was investigated through the analysis of crusts and patinas found on trachyte of the Euganean Hills in the Renaissance city walls of Padua, northeastern Italy. Mineralogical and microstructural characteristics of the alteration products, as well as major- and trace-element chemical composition, were determined by optical microscopy, SEM--EDS and X-ray mapping, XRPD, and LA-ICPMS. The results are discussed referring to environmental parameters, in particular concerning air quality and anthropic pollution sources. The influence of composition of the stone and other neighboring materials on specific weathering processes is also debated. The formation of crusts and patinas turns out to be mainly due to exogenous processes. Enrichment in heavy metals and carbonaceous matter derives from the deposition of particulate emitted during fuel combustion by road vehicles, domestic heating and, secondarily, industrial activities. The particulate is typically cemented by calcite, mainly mobilized after dissolution from nearby mortar joints, or iron, released by leaching from iron-bearing minerals, reprecipitated according to pH fluctuations. Gypsum layers were rarely observed. Generally, composition of the weathering crusts and patinas of Euganean trachyte proves to be an informative marker for the relevant environmental conditions and their evolution.",
day = "25",
doi = "10.1186/s40494-017-0156-z",
issn = "2050-7445",
journal = "Heritage Science",
month = "Oct",
number = "1",
pages = "44",
title = "{T}rachyte weathering in the urban built environment related to air quality",
url = "https://doi.org/10.1186/s40494-017-0156-z",
volume = "5",
year = "2017",
}


@article{Iovine2017,
author = "Raffaella Silvia Iovine and Lorenzo Fedele and Fabio Carmine Mazzeo and Ilenia Arienzo and Andrea Cavallo and Gerhard W{\"o}rner and Giovanni Orsi and Lucia Civetta and Massimo D'Antonio",
abstract = "Barium diffusion chronometry applied to sanidine phenocrysts from the trachytic Agnano-Monte Spina eruption (∼4.7 ka) constrains the time between reactivation and eruption of magma batches in the Campi Flegrei caldera. Backscattered electron imaging and quantitative electron microprobe measurements on 50 sanidine phenocrysts from representative pumice samples document core-to-rim compositional zoning. We focus on compositional breaks near the crystal rims that record magma mixing processes just prior to eruption. Diffusion times were modeled at a magmatic temperature of 930 {\textdegree}C using profiles based on quantitative BaO point analyses, X-ray scans, and grayscale swath profiles, yielding times ≤60 years between mixing and eruption. Such short timescales are consistent with volcanological and geochronological data that indicate that at least six eruptions occurred in the Agnano-San Vito area during few centuries before the Agnano-Monte Spina eruption. Thus, the short diffusion timescales are similar to time intervals between eruptions. Therefore, the rejuvenation time of magma residing in a shallow reservoir after influx of a new magma batch that triggered the eruption, and thus pre-eruption warning times, may be as short as years to a few decades at Campi Flegrei caldera.",
day = "24",
doi = "10.1007/s00445-017-1101-4",
issn = "1432-0819",
journal = "Bulletin of Volcanology",
month = "Jan",
number = "2",
pages = "18",
title = "{T}imescales of magmatic processes prior to the ∼4.7 ka {A}gnano-{M}onte {S}pina eruption ({C}ampi {F}legrei caldera, {S}outhern {I}taly) based on diffusion chronometry from sanidine phenocrys",
url = "https://doi.org/10.1007/s00445-017-1101-4",
volume = "79",
year = "2017",
}


@article{Thomas Kaufmann2017,
author = "Thomas Kaufmann and Joachim Reitner and  Kurt Sch{\"o}nhammer and Gerhard W{\"o}rner",
abstract = "Umbr{\"u}che markieren Stufen in der biologischen Evolution auf unserem Planeten, und sie sind Triebfeder und Ausgangspunkt grundlegender geschichtlicher, wissenschaftlicher, technologischer und gesellschaftlicher Entwicklungen und Prozesse. Ebenso wie geologische Umw{\"a}lzungen neue evolution{\"a}re Stufen erm{\"o}glichen, k{\"o}nnen geschichtliche, soziologische und technologische Umbr{\"u}che auch Innovationen und fundamentale gesellschaftliche Entwicklungen einleiten. Die Staaten und Gesellschaften der Welt stehen vor gro{\ss}en Herausforderungen und Umbr{\"u}chen, die die Zukunft der Menschen und die unseres Planeten erheblich ver{\"a}ndern werden. Diese Einsicht erzeugt nicht selten {\"A}ngste und Widerst{\"a}nde. Der Blick aus der Vergangenheit und das Lernen aus fr{\"u}heren geologischen, wissenschaftlichen, technischen, historischen und gesellschaftlichen Umbr{\"u}chen der Erd- und Menschheitsgeschichte wird daher notwendig sein, um die kommenden Umbr{\"u}che zu meistern und mit Zuversicht, aber auch politischer Kraft anzugehen. Die Zusammenfassungen ausgew{\"a}hlter Beitr{\"a}ge einer Vorlesungsserie der Akademie der Wissenschaften zu G{\"o}ttingen und der Universit{\"a}t G{\"o}ttingen zeigen an einzelnen Beispielen solche Umbr{\"u}che auf und erl{\"a}utern deren langfristige Konsequenzen.",
doi = "https://doi.org/10.17875/gup2017-1054",
issn = "978-3-86395-322-5",
title = "{V}ulkanausbr{\"u}che, {E}rdbeben, {K}limawandel: {W}ie innere {K}r{\"a}fte der {E}rde den {L}auf der {E}volution und unsere {G}eschichte pr{\"a}gen.",
year = "2017",
}


@proceedings{EMAC2017,
author = "Kibaroğlu M and Kozal E and Kl{\"u}gel A and Gerald Hartmann and Monien P",
abstract = "European Meeting on Ancient Ceramics. Bordeaux (France). ",
title = "{P}reliminary {R}esults of {C}hemical, {S}r and {N}d {I}sotopic {A}nalysis and {A}rchaeological {I}nterpretation",
year = "2017",
}