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Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault We performed U-Pb dating by the SHRIMP II method of zircon from granites and pegmatites in the southeastern part of the Main Sayan Fault (northern part of Khamar-Daban and southeastern part of the Belya-Kitoi Terrains in the Central Asian fold belt). According to the results obtained, along with the Late Ordovician granitoid magmatism, the Khamar-Daban and Belya-Kitoi Terrains were characterized by a less massive Carboniferous period at their boundary with the Siberian Craton accompanied by granite and pegmatite formation and reflecting tectonomagmatic activation of the Main Sayan Fault. Three stages of magmatic activation were noted. The earliest stage (about 350 million years ago) implies the formation of pegmatoid quartz-albite-microcline (amazonite) granite veins with Nb-Y mineralization in the fault zone. Oligoclase-microcline pegmatite veins with graphite were crystallized in the fault zone at the second stage (about 330 million years ago). The final stage of endogenetic activity (about 310 million years ago) was characterized by migmatization of the Khangarul Group of the Khamar-Daban Terrain and formation of potassium granites (Fig. 3; Table 1). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Doklady Earth Sciences Springer Journals

Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

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References (5)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Earth Sciences; Earth Sciences, general
ISSN
1028-334X
eISSN
1531-8354
DOI
10.1134/S1028334X12010291
Publisher site
See Article on Publisher Site

Abstract

We performed U-Pb dating by the SHRIMP II method of zircon from granites and pegmatites in the southeastern part of the Main Sayan Fault (northern part of Khamar-Daban and southeastern part of the Belya-Kitoi Terrains in the Central Asian fold belt). According to the results obtained, along with the Late Ordovician granitoid magmatism, the Khamar-Daban and Belya-Kitoi Terrains were characterized by a less massive Carboniferous period at their boundary with the Siberian Craton accompanied by granite and pegmatite formation and reflecting tectonomagmatic activation of the Main Sayan Fault. Three stages of magmatic activation were noted. The earliest stage (about 350 million years ago) implies the formation of pegmatoid quartz-albite-microcline (amazonite) granite veins with Nb-Y mineralization in the fault zone. Oligoclase-microcline pegmatite veins with graphite were crystallized in the fault zone at the second stage (about 330 million years ago). The final stage of endogenetic activity (about 310 million years ago) was characterized by migmatization of the Khangarul Group of the Khamar-Daban Terrain and formation of potassium granites (Fig. 3; Table 1).

Journal

Doklady Earth Sciences – Springer Journals

Published: Jan 1, 2012

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