Caractérisation des ignimbrites néogènes du bassin d'Arequipa, Pérou

Translated title of the contribution: Characteristics of the Neogene ignimbrites in the Arequipa area

Perrine Paquereau, Jean Claude Thouret, Gerhard Wörner, Michel Fornari, Orlando Efrain Macedo Sánchez, Pierrick Roperch

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Translated title of the contributionCharacteristics of the Neogene ignimbrites in the Arequipa area
Original languageFrench
Pages (from-to)477-486
Number of pages10
JournalComptes Rendus - Geoscience
Volume337
Issue number5
DOIs
StatePublished - Apr 2005
Externally publishedYes

Keywords

  • Ar-Ar ages
  • Ignimbrite
  • Peru
  • REE
  • Rhyolite
  • Stratigraphy
  • Trace elements

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