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GranitesPetrology, Structure, Geological Setting, and Metallogeny$
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Anne Nédélec and Jean-Luc Bouchez

Print publication date: 2015

Print ISBN-13: 9780198705611

Published to Oxford Scholarship Online: April 2015

DOI: 10.1093/acprof:oso/9780198705611.001.0001

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Precambrian granitic rocks

Precambrian granitic rocks

Chapter:
(p.252) 13 Precambrian granitic rocks
Source:
Granites
Author(s):

Anne Nédélec

Jean-Luc Bouchez

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198705611.003.0013

Granitic rocks represent the dominant part of the Precambrian continental crust and have characters different from younger granites. Methods for and the significance of age determinations are briefly reviewed. The Archaean TTGs (tonalites, trondhjemites and granodiorites) are examined with respect to their geochemistry, petrogenesis and setting, namely subduction environments or others, and exemplified by the melt products of the Barberton (South Africa) amphibolites. Late-Archaean potassic granitoids and sanukitoids, Proterozoic granitoids (Eburnian from West Africa, AMCG (anorthosite–mangerite–charnockite–granite) associations from Finland and Norway, etc.) and granitic rocks derived from impacts are examined in some detail. Sections include those on age determination, Archaean TTG granitoids, late-Archean granitoids, Proterozoic granitoids and impact granites, including the Sudbury igneous complex.

Keywords:   Precambrian granite, age determination, Archaean TTGs, Barberton amphibolites, Eburnian orogeny, AMCG association, Sudbury igneous complex, impact granite, sanukitoids

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