Geochemical Characteristics and Petrogenesis of Hongbaoshan-Jianquan Mafic-Ultramafic Intrusions in East Tianshan, Xinjiang

MA Fangbin; XI Guoqing; WANG Kaihu; FANG Fukang; BAI Yu; LIU Wenjian

Northwestern Geology > 2016 > 49(2): 176-188.

MA Fangbin, XI Guoqing, WANG Kaihu, et al. Geochemical Characteristics and Petrogenesis of Hongbaoshan-Jianquan Mafic-Ultramafic Intrusions in East Tianshan, Xinjiang[J]. Northwestern Geology, 2016, 49(2): 176-188.

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Geochemical Characteristics and Petrogenesis of Hongbaoshan-Jianquan Mafic-Ultramafic Intrusions in East Tianshan, Xinjiang

1. Geological Research Institute of China Chemical Geology and Mine Bureau, Zhuozhou 072754, Hebei, China;
2. Xinjiang Institute of Geological Exploration, General Bureau of Geology and Mine, Wulumuqi 830000, Xinjiang, China;
3. China Coal Geology Engineering Corporation, Beijing 100073, China;
4. Shanghai Shenfeng Institute of Novel Geological Techniques Co., Ltd. Shanghai 201702, China;
5. Xi'an Institute of Geological and Mineral Exploration, Xi'an 710100, Shaanxi, China

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Received Date: April 22, 2015
Revised Date: December 25, 2015
Available Online: July 28, 2022
Published Date: June 04, 2016

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Abstract

Located in the Kawabulake area of east Tianshan, the Hongbaoshan-Jianquan manfic-ultramafic intrusions exhibit as vein and lenticular, with outcropped area of ~8km². It mainly consists of dunite, peridotite and wehrlite. The geochemical data shows that these intrusions belong to magnesian ultramafic rocks, which are characterized by high Mg^# and gently LREE-rich pattern with low ∑REE values (0.96×10^-6~10.02×10^-6) and enrichment of LREE ((La/Yb)_N=2.14~4.08). Additionally, they are enriched LILE (Rb and Sr) and HFSE (U and Pb), and depleted HFSE (Nb(Ta), Hf and Ti). The δEu values vary from 0.63 to 1.08, which may be related with the crystallization of plagioclase.The geochemical diagrams of major and trace elements correlation indicate that the primary magma of Hongbaoshan-Jianquan intrusions is cal-alkaline basaltic magma that formed in mantle, their diagenesis are mainly controlled by the magmatic crystallization, and contaminated by the crust during upward of magma.
- manfic-ultramafic,
- geochemistry,
- crystallization differentiation,
- contamination,
- East Tianshan

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Geochemical Characteristics and Petrogenesis of Hongbaoshan-Jianquan Mafic-Ultramafic Intrusions in East Tianshan, Xinjiang

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