滇西维西—德钦一带花岗岩年代学、地球化学和岩石成因

高睿; 肖龙; 何琦; 袁静; 倪平泽; 杜景霞

doi:10.3799/dqkx.2010.019

Volume 35 Issue 2

Mar. 2010

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Article Navigation > Earth Science > 2010 > 35(2): 186-200

GAO Rui, XIAO Long, HE Qi, YUAN Jing, NI Ping-ze, DU Jing-xia, 2010. Geochronology, Geochemistry and Petrogenesis of Granites in Weixi-Deqin, West Yunnan. Earth Science, 35(2): 186-200. doi: 10.3799/dqkx.2010.019

Citation:

GAO Rui, XIAO Long, HE Qi, YUAN Jing, NI Ping-ze, DU Jing-xia, 2010. Geochronology, Geochemistry and Petrogenesis of Granites in Weixi-Deqin, West Yunnan. Earth Science, 35(2): 186-200. doi: 10.3799/dqkx.2010.019

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Geochronology, Geochemistry and Petrogenesis of Granites in Weixi-Deqin, West Yunnan

doi: 10.3799/dqkx.2010.019

1.
Graduate School, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2009-01-11
Publish Date: 2010-03-01

Abstract

Abstract

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.
- paleo-Tethys,
- adakitic rock,
- Ⅰ-type granite,
- geochronology,
- geochemistry,
- Sr-Nd isotope,
- petrogenesis

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References(74)

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Geochronology, Geochemistry and Petrogenesis of Granites in Weixi-Deqin, West Yunnan

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