Geochronology, geochemistry and petrogenesis of granites in Weixi-Deqin, West Yunnan

被引：33
作者：
Gao R. [1 ]
Xiao L. [2 ]
He Q. [1 ]
Yuan J. [1 ]
Ni P.-Z. [1 ]
Du J.-X. [1 ]
机构：
[1] Graduate School, China University of Geosciences
[2] Faculty of Earth Sciences, China University of Geosciences
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2010年 / 35卷 / 02期
关键词：
Adakitic rock; Geochemistry; Geochronology; I-type granite; Paleo-Tethys; Petrogenesis; Sr-Nd isotope;
D O I：
10.3799/dqkx.2010.019
中图分类号：
学科分类号：
摘要：
There is still much dispute over the exact subduction and collision time of Jinshajiang arc-basin system, which reveals geological evolution history of the paleo-Tethys in West China. This study provides chronological, petrological, and geochemical data of Gongka and Yangla granitoid plutons that are situated on the western margin of Jinshajiang suture zone but poorly studied in Deqin-Weixi area, Yunnan Province. The Yangla granitoid complex is divided into granodiorite and monzonite. LA-ICP-MS zircon dating results are 229.6 Ma (Yangla granodiorite), 232 Ma (Gongka granodiorite) and 261 Ma (Yangla monzonite), respectively. Yangla monzonites, showing O-adakitic affinity, was generated through partial melting of oceanic slab when subducting, probably subjected to metasomatism of the mantle wedge. Gongka granodiorites and Yangla granodiorites were derived from partial melting of lower crustal rocks. In general, we conclude that the subduction started from Middle Permian to Late Permian and the collision started in Late Permian and terminated in early Middle Triassic.
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页码：186 / 200
页数：14
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