A re-appraisal of the stratigraphy and volcanology of the Cerro Galan volcanic system, NW Argentina

Christopher Folkes, Heather Wright, Raymond Cas, Shanaka De Silva, Chiara Lesti, Jose Viramonte

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    Abstract

    From detailed fieldwork and biotite (40)Ar/(39)Ar dating correlated with paleomagnetic analyses of lithic clasts, we present a revision of the stratigraphy, areal extent and volume estimates of ignimbrites in the Cerro Galan volcanic complex. We find evidence for nine distinct outflow ignimbrites, including two newly identified ignimbrites in the Toconquis Group (the Pitas and Vega Ignimbrites). Toconquis Group Ignimbrites (similar to 5.60-4.51 Ma biotite ages) have been discovered to the southwest and north of the caldera, increasing their spatial extents from previous estimates. Previously thought to be contemporaneous, we distinguish the Real Grande Ignimbrite (4.68 +/- 0.07 Ma biotite age) from the Cueva Negra Ignimbrite (3.77 +/- 0.08 Ma biotite age).
    Original languageEnglish
    Pages (from-to)1427 - 1454
    Number of pages28
    JournalBulletin of Volcanology
    Volume73
    Issue number10
    DOIs
    Publication statusPublished - 2011

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