东昆中构造混杂岩带清泉沟弧前玄武岩地质、地球化学特征及构造环境

李瑞保; 裴先治; 李佐臣; 裴磊; 陈国超; 李小兵; 陈有炘; 刘成军; 魏博

doi:10.3799/dqkx.2018.540

Volume 43 Issue 12

Dec. 2018

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Article Navigation > Earth Science > 2018 > 43(12): 4521-4535

Li Ruibao, Pei Xianzhi, Li Zuochen, Pei Lei, Chen Guochao, Li Xiaobing, Chen Youxin, Liu Chengjun, Wei Bo, 2018. Geochemistry and Tectonic Setting of Qingquangou Forearc Basalts in Central Tectonic Mélange of East Kunlun Orogen. Earth Science, 43(12): 4521-4535. doi: 10.3799/dqkx.2018.540

Citation:

Li Ruibao, Pei Xianzhi, Li Zuochen, Pei Lei, Chen Guochao, Li Xiaobing, Chen Youxin, Liu Chengjun, Wei Bo, 2018. Geochemistry and Tectonic Setting of Qingquangou Forearc Basalts in Central Tectonic Mélange of East Kunlun Orogen. Earth Science, 43(12): 4521-4535. doi: 10.3799/dqkx.2018.540

Citation:

Li Ruibao, Pei Xianzhi, Li Zuochen, Pei Lei, Chen Guochao, Li Xiaobing, Chen Youxin, Liu Chengjun, Wei Bo, 2018. Geochemistry and Tectonic Setting of Qingquangou Forearc Basalts in Central Tectonic Mélange of East Kunlun Orogen. Earth Science, 43(12): 4521-4535. doi: 10.3799/dqkx.2018.540

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Geochemistry and Tectonic Setting of Qingquangou Forearc Basalts in Central Tectonic Mélange of East Kunlun Orogen

doi: 10.3799/dqkx.2018.540

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Chang'an University, Xi'an 710054, China

Received Date: 2018-02-10
Publish Date: 2018-12-15

Abstract

Abstract

The research on magmatic source and tectonic setting of Qingquangou basalts in eastern section of East Kunlun is important for discussion of the tectonic evolution of East Kunlun ocean. This paper presents a systematic field geology, geochemistry, and tectonic setting research. The results show that the SiO₂ contents of Qingquangou basalts range from 48.60% to 49.28%, MgO contents range from 7.72%-8.00%, TiO₂ contents range from 1.07%-1.10% (average values, 1.09%), which are similar to the values of Izu-Bonin-Mariana forearc basalt, West Pacific. The basalts are classified into the tholeiitic basalt of subalkaline series based on the major elements feature. Qingquangou basalts are characterized by the ∑LREEs range from 22.64×10^-6-33.31×10^-6, ∑HREEs range from 13.13×10^-6-18.37×10^-6, ∑REEs range from 36.02×10^-6-51.68×10^-6, and (La/Yb)_N range from 0.88-1.10. The chondrite normalized REE patterns show the widely enriched-depleted feature of LREE, resembling the feature of NMORB basalts and IBM forearc basalts, West Pacific. Moreover, the samples have low ratios of Ti/Y (312) and Ti/V (< 20), also indicative of the forearc basalt feature. The primitive mantle normalized trace element spider diagram shows enriched LILEs and undifferentiated HFSEs (e.g., Nb, Ta, Zr, Hf, etc.) features. Petrogenesis research shows that its source was derived from the depleted mantle, and further proves that its partial melting degree is higher than that of NMORB-type basalts. Additionally, the tectonic discrimination diagram suggests that the basalts formed in forearc tectonic setting. Combined with the previous data, it is concluded that East Kunlun ocean began to subduct northward at Middle Cambrian (ca.510 Ma), and that Qingquangou forearc basalts were generated meanwhile, forming the nascent island arc crust.
- East Kunlun,
- ophiolite,
- Qingquangou,
- forearc basalt,
- geochemistry

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References(111)

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Geochemistry and Tectonic Setting of Qingquangou Forearc Basalts in Central Tectonic Mélange of East Kunlun Orogen

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