NDLI: Early Precambrian granite-gneiss complexes in the Central Aldan Shield

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Early Precambrian granite-gneiss complexes in the Central Aldan Shield

Content Provider	Springer Nature Link
Author	Velikoslavinskii, S. D. Kotov, A. B. Tolmacheva, E. V. Sal’nikova, E. B. Kovach, V. P. Larin, A. M.
Copyright Year	2011
Abstract	The central portion of the Aldan Shield hosts very widely spread Archean and Early Proterozoic granitoids, much of which are granite-gneisses. Geochemical lines of evidence, data on inclusions in minerals, and Sm-Nd isotopic geochemical data suggest that the protoliths of granite-gneisses in the central part of the Aldan Shield were granitoids that had various composition, age, and were derived from distinct sources and under different parameters and were then emplaced in different geodynamic environments. The granitoids belong to at least two types of different composition that occur within spatially separated areas. The protoliths of granite-gneisses in the western part of the Western Aldan Megablock and the junction zone of the Chara-Olekma and Aldan geoblocks (granite-gneisses of type I) had the same age and affiliated to the same associations as the within-plate granitoids of the Nelyukinskii Complex. Their parental melts were derived at 2.4–2.5 Ga by the melting of Archean tonalite-trondhjemite orthogneisses of the Olekma and Aldan complexes. The protolith of granite-gneisses in the eastern portion of the Western Aldan Megablock (granite-gneisses of type II) can be subdivided into two groups according to their composition: granitoids with geochemical characteristics of subduction- and collision-related rocks. The protoliths of the type-II granite-gneisses with geochemical characteristics of subduction granitoids were produced simultaneously with the development of the Fedorovskaya island arc (at 2003–2013 Ma), whereas the protoliths of the type-II granite-gneisses with geochemical characteristics of collision granitoids were formed in the course of accretion of the Fedorovskaya island arc and the Olekma-Aldan continental microplate at 1962–2003 Ma, via the melting of magmatic rocks of the Fedorovskaya unit and older continental crustal material.
Starting Page	382
Ending Page	398
Page Count	17
File Format	PDF
ISSN	08695911
Journal	Petrology
Volume Number	19
Issue Number	4
e-ISSN	15562085
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-07-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemistry Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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