Geochemical and isotopic constraints on the origin and source of Archaean granites

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Abstract

Archaean granites (including quartz monzonites) can be divided into three geochemical classes based chiefly on REE distributions. Geochemical model studies, initial 87Sr/86Sr ratios, and O-isotope data are consistent with an origin for most Archaean granites by partial melting (approx 20%) of one of three rock types in the lower crust with short crustal residence times: tonalite-trondhjemite, high-grade gneiss (of intermediate composition), or less likely, greywacke. Only a few percent of subcontinental mantle heat is needed to account for Archaean granite magma production by partial melting of the lower crust. (Author's abstract) J.A.H.

Original languageEnglish
Pages (from-to)469-479
Number of pages11
JournalSpecial Publication, Geological Society of Australia
Volume7
Publication statusPublished - 1981
Externally publishedYes

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