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The use of LA-ICP-MS in a pilot study for determining the concentration of selected trace elements in rudist shells

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Year:
2015
Type of Publication:
Article
Authors:
Sánchez-Beristain, F.; L, Pérez-Cruz; P, García-Barrera; LLE, Kranksith; J, Urrutia-Fucugauchi; JP, Duda
Journal:
BOLETÍN GEOLÓGICO Y MINERO
Volume:
126
Number:
1
Pages:
159-168
BibTex:
Abstract:
A protocol for the determination of the concentration of selected elements in two rudist shells was developedusing Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). Element analysis in rud-ists has never been performed beyond including major and some minor elements, and thus this work pres-ents the first results in this field. The concentrations of 35 isotopes were analyzed. Low iron and manganeseconcentrations reflect the absence of a diagenetical imprint on both shells. There is a negligible amount ofcrust-associated elements, which reveal little evidence of terrigenous input. Phosphorus amount is also low;however, it is high enough to mask reliable Rare Earth + Yttrium (REY) pattern measurements. Strontium andmagnesium concentrations in the inner layers of a shell of Titanosarcolitesshow relicts of an original arago-nitic composition. On the contrary, concentrations of these elements in a shell of Biradiolites rudissimusreveal an original low Mg-calcite mineralogy in its outer layers. The two shells were selected, consideringtheir apparently a priorigood preservation, based on the petrological examination of thin sections. No sig-nificant concentrations of elements such as chromium, cobalt, nickel, copper, zinc, molybdenum or antimo-ny could be found. The concentrations of vanadium and barium may reflect evidence of biological activity,since they apparently do not correlate significantly with silicon, aluminium or sulphur. The low cost and pre-cision of this method in comparison to others such as the use of electron microprobe, or X-ray fluorescence,makes it an optimum alternative for geochemical analyses of fossils, thus opening a new line of research.

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