Chemical and isotopic evolution of the Coastal Batholith of southern Peru

M. Boily, C. Brooks, J. N. Ludden, D. E. James

Research output: Contribution to journalArticle

Abstract

Southeast of Arequipa, the Coastal Batholith of southern Peru is composed of two segments (Arequipa and Toquepala) including five superunits which were emplaced in discrete magmatic pulses from the Jurassic to the Paleocene eras (190-61 Ma). Most superunits intruded a Precambrian basement dominated by granulitic and amphibolitic rocks. Major and trace element analyses reveal that each superunit is formed by distinct suites of calc-alkaline plutons (i.e., "I' type) that range in composition from quartz gabbro to monzogranite. For the whole plutonic suite located in southern Peru, the evolution toward negative εnd i and positive εSr i values is followed by a significant decrease in 206Pb/204Pbi ratios but is also related to the density of Precambrian outcrops. This led us to classify the intrusives into three groups. There are several petrogenetic models which can explain the trace element, isotopic, and geographic correlations observed within the Coastal Batholith of southern Peru. -from Authors

Original languageEnglish
Pages (from-to)12483-12498
Number of pages16
JournalJournal of Geophysical Research
Volume94
Issue numberB9
DOIs
Publication statusPublished - 10 Sep 1989

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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