东昆仑祁漫塔格晚古生代末期幔源岩浆活动成因及地质意义:以鹰爪沟岩体为例

胡朝斌; 李猛; 查显锋; 高晓峰; 李婷

doi:10.3799/dqkx.2018.120

Volume 43 Issue 12

Dec. 2018

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Article Navigation > Earth Science > 2018 > 43(12): 4334-4349

Hu Chaobin, Li Meng, Zha Xianfeng, Gao Xiaofeng, Li Ting, 2018. Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou. Earth Science, 43(12): 4334-4349. doi: 10.3799/dqkx.2018.120

Citation:

Hu Chaobin, Li Meng, Zha Xianfeng, Gao Xiaofeng, Li Ting, 2018. Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou. Earth Science, 43(12): 4334-4349. doi: 10.3799/dqkx.2018.120

Citation:

Hu Chaobin, Li Meng, Zha Xianfeng, Gao Xiaofeng, Li Ting, 2018. Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou. Earth Science, 43(12): 4334-4349. doi: 10.3799/dqkx.2018.120

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Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou

doi: 10.3799/dqkx.2018.120

Hu Chaobin^{1,3
,},
Li Meng^1,2,
Zha Xianfeng^1,2,
Gao Xiaofeng^1,2,
Li Ting^1,2

1.
Xi'an Center of Geological Survey, Orogen Research Center, China Geological Survey, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an 710054, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2018-05-07
Publish Date: 2018-12-15

Abstract

Abstract

The study of the origin of mantle-derived magmatism is of great significance to the tectonic evolution history. Located in the Yingzhuagou area of Qimantag, East Kunlun, the mafic-ultramafic layered intrusion consists of olivine gabbro-norite, feldspar-olivine websterite and olivine websterite.The LA-ICP-MS zircon U-Pb dating results suggest that the olivine gabbro-norite intruded at 263±4 Ma, belonging to late Middle Permian. All the rocks are characterized by low SiO₂, high MgO and FeO_t, enrichment of LREE and LILE, depletion of HREE and incompatible elements (e.g.Th, U, Nb, Ta, Ti). ε_Nd(t)=0.73-0.92, ε_Hf(t)=8.33-13.50. Based on the regional geological background, it is suggested that the rocks were formed in an active continental margin rift setting with the subduction of Paleo-Tethys Ocean. The magma came from the lithospheric mantle metasomatized by subduction fluid and asthenosphere melt. Combining the data of granite that originated from mixing of crustal and mantle materials in the same period, it is concluded that underplating of mantle-derived magmas should have started before Middle Permian in East Kunlun area and should have been controlled by the regional extensional setting in the subduction of Paleo-Tethys Ocean.
- Qimantag,
- Middle Permian,
- mafic-ultramafic rock,
- lithospheric mantle metasomatism,
- underplating of mantle-derived magma,
- geochemistry

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Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou

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