Zircon SHRIMP Dating for the Weiya P

Zircon SHRIMP Dating for the Weiya Pluton, Eastern Tianshan: Its Geological Implications

The timing of the emplacement of the Weiya pluton remains controversial due to the absence of systematic and precise dating.This paper reports zircon SHRIMP U-Pb dating of different lithologic phases in the Weiya pluton,and discusses the genesis and tectonic environment.The ages of gabbro,quartz syenite,diorite porphyrite and fine-grained granite are 236±6 Ma,246±6 Ma,233±8 Ma and 237±8 Ma,respectively.All these phases were formed in early-middle Indosinian (Triassic) in a post-orogenic environment.In addition to underplating,intraplating of mantle-derived magmas is also a substantial mechanism for magma generation and vertical accretion of the continental crust.Granitoid rocks are important products of vertical continental accretion as underplating evolves gradually to intraplating.The existence of post-orogenic Indosinian granites shows that the middle Tianshan orogenic belt underwent an important tectonic conversion from the Paleo-Asian ocean subduction-collision system to the Paleo-Tethys ocean regime.

作 者： ZHANG Zunzhong GU Lianxing WU Changzhi Li Weiqiang XI Aihua WANG Shuo   作者单位： State Key Laboratory of Mineral Deposit Research (Nanjing University),Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu 210093  刊 名： 地质学报（英文版）  SCI 英文刊名： ACTA GEOLOGICA SINICA  年，卷(期)： 2005 79(4)  分类号： P5  关键词： SHRIMP dating   post-orogenic   Indosinian   Weiya pluton   eastern Tianshan   Xinjiang  

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