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

S. J. Roberts, Joaquin Ruiz

Research output: Contribution to journalArticle

72 Citations (Scopus)

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: Space Physics
Volume94
Issue numberB6
StatePublished - 1989

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Geochemistry
Carbonates
Mexico
Trace Elements
geochemistry
granulite facies
lower crust
crusts
Lithology
xenolith
Garnets
Inductively coupled plasma
Mass spectrometers
metasediment
cumulate
Trace elements
Chemical analysis
pyroxene
Population
zonation

ASJC Scopus subject areas

  • Medicine(all)
  • Engineering(all)

Cite this

Geochemistry of exposed granulite facies terrains and lower crustal xenoliths in Mexico. / Roberts, S. J.; Ruiz, Joaquin.

In: Journal of Geophysical Research: Space Physics, Vol. 94, No. B6, 1989, p. 7961-7974.

Research output: Contribution to journalArticle

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