柴北缘从大洋俯冲到陆陆碰撞:来自开屏沟造山带M型橄榄岩的证据

蔡鹏捷; 许荣科; 郑有业; 陈鑫; 刘嘉; 俞军真

doi:10.3799/dqkx.2018.112

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2875-2892

Cai Pengjie, Xu Rongke, Zheng Youye, Chen Xin, Liu Jia, Yu Junzhen, 2018. From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite. Earth Science, 43(8): 2875-2892. doi: 10.3799/dqkx.2018.112

Citation:

Cai Pengjie, Xu Rongke, Zheng Youye, Chen Xin, Liu Jia, Yu Junzhen, 2018. From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite. Earth Science, 43(8): 2875-2892. doi: 10.3799/dqkx.2018.112

Citation:

Cai Pengjie, Xu Rongke, Zheng Youye, Chen Xin, Liu Jia, Yu Junzhen, 2018. From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite. Earth Science, 43(8): 2875-2892. doi: 10.3799/dqkx.2018.112

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From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite

doi: 10.3799/dqkx.2018.112

Cai Pengjie^1
,,
Xu Rongke^{1
,
,},
Zheng Youye^1,2,
Chen Xin²,
Liu Jia^1,3,
Yu Junzhen²

1.
Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China
2.
The Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geological Survey of Hubei Province, Wuhan 430074, China

Received Date: 2018-04-27
Publish Date: 2018-08-15

Abstract

Abstract

Orogenic peridotites(M-type) are uncommon in high-pressure(HP) and ultrahigh-pressure(UHP) metamorphic belts. However, they are not only a key to study the metamorphic and metasomatic information from subducting slabs and mantle wedges in subduction channel, but also of great significance to the evolution of orogenic belt. There is a set of peridotite in Kaipinggou near the edge of the Iqe eclogite-gneiss region, of which rock types, genesis, and age are short of research. Whole-rock major and trace and platinum-group elements, olive mineral elements, and zircon U-Pb dating and Hf isotopes for peridotite at Kaipinggou are studied in this paper. Kaipinggou peridotites are characterized by high contents of Mg^#, Mg/Si and Ni, showing similar distribution patterns of REE and trace elements, depletion in HFSE and HREE, and slightly enrichment in LILE and LREE. Olivines have high Fo(90.11-92.77)and NiO(0.32%-0.45%) contents, but low contents of CaO(0.02%). Whole-rock platinum group elements(PGEs) are similar to those of metamorphic and residual peridotites. There are two groups of metamorphic zircons in the Kaipinggou peridotites, with ages of 459.5±3.6 Ma and 417.5±2.7 Ma, corresponding to ε_Hf(t) of -0.71 to 9.45 and -11.96 to -1.20, respectively, indicating the nature and timing of the fluid derived from oceanic crust(or early continental crust subduction) and continental crust. In conclusion, the Kaipinggou peridotites are derived from the mantle wedge of the lithosphere and record the crustal features due to the metasomatism of the oceanic and continental crust fluids. The novel findings provide new evidence for the evolution of oceanic lithosphere subduction to continental collision/subduction in the North Qaidam.
- North Qaidam,
- Kaipinggou,
- orogenic belt,
- M-type peridotite,
- zircon U-Pb-Hf isotopes,
- geochemistry,
- geochronology

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References(44)

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From Oceanic Subduction to Continental Collision in North Qaidam: Evidence from Kaipinggou Orogenic M-Type Peridotite

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