Caractérisation des ignimbrites néogènes du bassin d'Arequipa,Pérou |
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| Authors: | Perrine Paquereau Jean-Claude Thouret Gerhard Wörner Michel Fornari Orlando Macedo Pierrick Roperch |
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| Institution: | 1. Laboratoire « Magmas et Volcans », UMR 6524, CNRS et OPGC, université Blaise-Pascal–Clermont-2, 5, rue Kessler, 63038 Clermont-Ferrand cedex, France;2. Geowissenschaftliches Zentrum der Universität Göttingen, Abt. Geochimie, Universität Göttingen, 37077 Göttingen, Allemagne;3. Géosciences Azur UMR 6526 CNRS et IRD UR 104, université de Nice–Sophia Antipolis, parc Valrose, 06108 Nice cedex 02, France;4. Instituto Geofísico del Perú, Oficina regional Arequipa, Cayma, Arequipa, Pérou;5. IRD UR 104 et université de Rennes-1, campus de Beaulieu, av. du Général-Leclerc, 35042 Rennes cedex, France |
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| Abstract: | Four ignimbritic units have filled the Arequipa Basin and outcrop around the Chachani Volcano. (1) The oldest Río 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 Río 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). |
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| Keywords: | Ignimbrite Pérou Stratigraphie Rhyolite Éléments en traces Ignimbrite Peru Stratigraphy Rhyolite Trace elements REE |
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