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Erosion rates and erosion patterns of Neogene to Quaternary stratovolcanoes in the Western Cordillera of the Central Andes: An SRTM DEM based analysis

Hits: 1007
Year:
2012
Type of Publication:
Artikel
Schlüsselwörter:
Volcanic geomorphology, DEM-morphometry, Stratovolcano erosion, Central Andes, Climate
Autoren:
Karátson, D; Telbisz, T; Wörner, Gerhard
Journal:
Geomorphology
Volume:
139–140
Seiten:
122-135
Monat:
2012/2/15/
ISSN:
0169-555X
BibTex:
Kurzzusammenfassung:
Erosion patterns and rates of 33 stratovolcanoes in the arid to hyperarid Central Andean Volcanic Zone (14°S to 27°S) have been constrained by morphometric modelling. All selected volcanoes belong to the short-lived, symmetrical, circular andesitic stratocone type, with ages spanning 14 Ma to recent. Starting from the initial, youthful volcano morphology of this type, represented in our study by Parinacota volcano, and comparing reconstructed volumes of progressively eroded volcanoes, such a time span allows us to infer long-term erosion rates. Typical erosion rates of wn to approximately one tenth of this after a few Ma. An inverse correlation is observed between the degree of denudation (defined as volume removed by erosion/original volume) and edifice height from base to top after erosion. This relationship is independent of climate and original edifice elevation. The degree of denudation vs. volcano age provides a rough morphometric tool to constrain the time elapsed since the extinction of volcanic activity. This method can, however, only be applied to the volcanoes of the Altiplano (i.e. under uniform, long-term arid climate) with an uncertainty of ~ 1 Ma. Finally, an erosional pathway is suggested for volcanoes of the Altiplano–Puna preserving a peculiar “edelweiss” valley pattern related to glaciations. This pattern may have overprinted previous drainages and resulted in a discontinuous height reduction of the degrading stratovolcanoes.
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