Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9462008 | Comptes Rendus Geoscience | 2005 | 10 Pages |
Abstract
Four ignimbritic units have filled the Arequipa Basin and outcrop around the Chachani Volcano. (1) The oldest RÃo Chili ignimbrite is 13.33 Ma old; (2) the most widespread La Joya ignimbrite is 4.9 Ma old; (3) the Arequipa Airport ignimbrite (1.65 Ma) flowed from an area buried beneath Chachani; (4) the Yura Tuffs, 1.02 Ma old, are restricted to the west of Chachani. All are calc-alkaline rhyolites with plagioclase, biotite, quartz, sanidine, and opaques, but the RÃo Chili and La Joya ignimbrites also contain amphibole. Trace elements of the older ignimbrites reflect stronger crustal influence. To cite this article: P. Paquereau et al., C. R. Geoscience 337 (2005).
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
Perrine Paquereau, Jean-Claude Thouret, Gerhard Wörner, Michel Fornari, Orlando Macedo, Pierrick Roperch,