Geochemistry of exposed granulite facies terrains and lower crustal xenoliths in Mexico

S. J. Roberts, J. Ruiz

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

The trace element compositions of 13 samples from exposed granulite facies terrains and 17 granulitic lower crustal xenoliths were determined using an inductively coupled plasma-mass spectrometer to constrain the composition and evolution of the Mexican lower crust. Most xenoliths found are pyroxene-plagioclase orthogneisses, although quartzo-feldspathic paragneisses form up to 50% of the xenolith population in some areas. Lithologies in the exposed terrains consist of pelitic and carbonate-rich paragneisses, charnockites, and less abundant basic, intermediate, and felsic orthogneisses. The differences observed between the xenoliths and exposed granulites indicate that there may be chemical and lithologic zonation in the Mexican lower crust. The lowermost crust in Mexico consists of crystallized basaltic liquids, cumulates, and/or residue after the removal of a partial melt as well as garnet-rich metasediments. -from Authors

Original languageEnglish (US)
Pages (from-to)7961-7974
Number of pages14
JournalJournal of Geophysical Research
Volume94
Issue numberB6
DOIs
StatePublished - Jan 1 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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