SM-ND ISOTOPIC SYSTEMATICS OF THE KURUMKAN SUBGROUP, THE IENGRA GROUPOF ALDAN SHIELD

Citation
Vp. Kovach et al., SM-ND ISOTOPIC SYSTEMATICS OF THE KURUMKAN SUBGROUP, THE IENGRA GROUPOF ALDAN SHIELD, Stratigraphy and geological correlation, 4(3), 1996, pp. 213-219
Citations number
39
Categorie Soggetti
Geology,Paleontology
ISSN journal
08695938
Volume
4
Issue
3
Year of publication
1996
Pages
213 - 219
Database
ISI
SICI code
0869-5938(1996)4:3<213:SISOTK>2.0.ZU;2-C
Abstract
The first data on the Nd isotopic composition in high-Al gneisses and associated garnet-hypersthene-biotite plagiogneisses of the Kurumkan S ubgroup, the Iengra Group of Aldan Shield are presented. The obtained results show that rocks of the subgroup accumulated after similar to 2 .9 Ga, i.e., during the Late Archean or Early Proterozoic, and not the Early Archean evolutionary stage of the shield. Protoliths of garnet- hypersthene-biotite gneisses were not older than 2.3 Ga, and their for mation marks the Early Proterozoic stage of continental crust generati on in the Aldan granulite-gneiss region.