西南天山阔克萨彦岭地区巴雷公地幔橄榄岩成因及其地质意义

王超; 刘良; 罗金海; 车自成; 张静艺; 桂小军

Volume 33 Issue 2

Mar. 2008

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Article Navigation > Earth Science > 2008 > 33(2): 165-173

WANG Chao, LIU Liang, LUO Jin-hai, CHE Zi-cheng, ZHANG Jing-yi, GUI Xiao-jun, 2008. Petrogenesis and Geological Implication of Serpentinized Peridotites in the Kokshal Segment, South Tianshan. Earth Science, 33(2): 165-173.

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Petrogenesis and Geological Implication of Serpentinized Peridotites in the Kokshal Segment, South Tianshan

1.
Xi'an Institute of Geology and Mineral Resource, China Geological Survey, Xi' an 710054, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
3.
Institute of Exploration and Development, Changqing Oilfield Company, Xi'an 710021, China

Received Date: 2007-09-25
Publish Date: 2008-03-25

Abstract

Abstract

South Tianshan is a prominent intracontinental collisional orogenic belt and a key to understand the central Asia tectonic evolution.The serpentinized peridotites from Baleigong ophiolitic mélange was emplaced in the southwestern Kokshal area, which represents lithosphere remnants of the Early Paleozoic Southwestern Tianshan Ocean.The serpentinized peridotites are characterized by low Ti, Al contents and high Cr (1 604-3 863), Ni (1 719×10^-6-2 375×10^-6), Mg^# (0.90-0.92).The right slopping PUM-normalized trace element patterns and the U-shape chondrite-normalized REE pattern reveal that these rocks cannot be residues of simple melt extraction.They can be modeled as restites after 20%-30% partial melting from already depleted mantle in a supra-subduction zone (SSZ) geotectonic setting, in which a constant flux of a slab-derived fliud component added to the mantle wedge during melting.Combined with recent studies, it is concluded that the Paleozoic Southwestern Tianshan Ocean was a mature one that had even experienced a subduction event in Early Paleozoic.The serpentinized peridotites were formed at the fore-arc of the intra-oceanic subduction zone.
- mantle peridotite,
- supra-subduction zone,
- mantle melting,
- Baleigong,
- Kokshal,
- South Tianshan

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Petrogenesis and Geological Implication of Serpentinized Peridotites in the Kokshal Segment, South Tianshan

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