东昆仑中灶火地区超镁铁质辉石岩的成因

罗文行; 钱莉莉; 李德威; 朱云海; 刘德民; 高成

doi:10.3799/dqkx.2013.119

Volume 38 Issue 6

Jun. 2013

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Article Navigation > Earth Science > 2013 > 38(6): 1214-1228

LUO Wen-xing, QIAN Li-li, LI De-wei, ZHU Yun-hai, LIU De-min, GAO Cheng, 2013. Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton, East Kunlun: Constraints from Petrology, Geochemistry and Genetic Mineralogy. Earth Science, 38(6): 1214-1228. doi: 10.3799/dqkx.2013.119

Citation:

LUO Wen-xing, QIAN Li-li, LI De-wei, ZHU Yun-hai, LIU De-min, GAO Cheng, 2013. Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton, East Kunlun: Constraints from Petrology, Geochemistry and Genetic Mineralogy. Earth Science, 38(6): 1214-1228. doi: 10.3799/dqkx.2013.119

Citation:

LUO Wen-xing, QIAN Li-li, LI De-wei, ZHU Yun-hai, LIU De-min, GAO Cheng, 2013. Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton, East Kunlun: Constraints from Petrology, Geochemistry and Genetic Mineralogy. Earth Science, 38(6): 1214-1228. doi: 10.3799/dqkx.2013.119

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Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton, East Kunlun: Constraints from Petrology, Geochemistry and Genetic Mineralogy

doi: 10.3799/dqkx.2013.119

LUO Wen-xing^{1, 2
,},
QIAN Li-li^{1, 2},
LI De-wei^{2, 4
,
,},
ZHU Yun-hai^{2, 3},
LIU De-min²,
GAO Cheng²

1.
Three Gorges Geotechnical Consultants Co., Ltd, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China
4.
Research Center of Tibetan Plateau, China University of Geosciences, Wuhan 430074, China

Received Date: 2012-12-11
Publish Date: 2013-06-01

Abstract

Abstract

A ultramafic pyroxenite pluton has been discovered in Zhongzaohuo area in the East Kunlun orogen Recently. This paper reports the results of petrological, geochemical and genetic mineralogy research on the pyroxenite pluton. The rock is mainly composed of clinopyroxene, orthopyroxene and amphibole, and minor plagioclase, quartz, biotite and iron opaque minerals. Amphibole and biotite were formed during retrograde metamorphism. The discriminant analysis results suggest that the Opx are magmatogenic, thus the rock should be named pyroxenite rather than granulite. The rock has high MgO, CaO and low Al₂O₃ and enriched in Rb and Th and depleted in Nb and Ti, showing clear evidence for an enriched mantle source. Field occurrence of the pyroxenite pluton suggests that the pyroxenite pluton was formed after the mylonization of the surrounding rocks. Combined with the tectonic evolution of East Kunlun, we come to the conclusion that the subduction of an Paleo-Tethys(A'nyemaqen) oceanic slab at the Middle Permian led to fluid and Si-rich?melt metasomatism, inducing partial melting of an enriched lithospheric mantle(peridotites) to form the ultramafic pyroxenite magma. The pyroxenite magma underplated the overlying lower crust, captured the metamorphic zircons of the granulite and exchanged some trace elements, but didn't result in the lower crust partial melting to form any felsic magma. The pyroxenite magma emplaced alone eventually.
- pyroxenite,
- geochemistry,
- mineralogy,
- metasomatic,
- the East Kunlun

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Petrogenesis of the Zhongzaohuo Ultramafic Pyroxenite Pluton, East Kunlun: Constraints from Petrology, Geochemistry and Genetic Mineralogy

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