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Geochronology, geochemistry and tectonic implications of late Carboniferous Daheyan intrusions from the Bogda Mountains, eastern Tianshan

Published online by Cambridge University Press:  29 July 2019

Xuebing Zhang
Affiliation:
College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China
Fengmei Chai
Affiliation:
College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China
Chuan Chen
Affiliation:
College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China
Hongyan Quan
Affiliation:
School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, New South Wales 2052, Australia
Xiaoping Gong*
Affiliation:
College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China
*
Author for correspondence: Xiaoping Gong, Email: [email protected]

Abstract

The Daheyan region, situated in the SW of the Bogda Mountains in eastern Tianshan, is important for understanding the accretionary history of the Central Asian Orogenic Belt. We investigated Carboniferous intrusions from the Daheyan area, SW Bogda Mountains, obtaining new zircon U–Pb ages, whole-rock geochemical data and Hf isotope data for these intrusions. Zircon U–Pb dating indicates that syenogranite, diorite, granodiorite and monzonite of the Daheyan intrusions were all formed during late Carboniferous (311–303 Ma) magmatism. The syenogranite has geochemical characteristics of A-type granites that were mainly sourced from melting of juvenile crust. In comparison, the low-Mg-number diorite intrusion, with tholeiite and metaluminous features, was derived from young crust and mixed some mantle materials. The granodiorite and monzonite are both I-type granites, and are both sourced from the melting of juvenile crust. Based on a comprehensive analysis of previous geochronological, geochemical and isotopic data of magmatic and sedimentary rocks in the Bogda–Harlik belt, we consider that late Carboniferous intrusive rocks of the Bogda Mountains formed in an intra-arc extension related to a continent-based arc setting.

Type
Original Article
Copyright
© Cambridge University Press 2019 

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