西大别南缘印支期吕王-高桥-永佳河构造混杂岩带的厘定及其构造意义

徐扬; 杨振宁; 邓新; 王令占; 刘浩; 金鑫镖; 张维峰; 魏运许; 彭练红; 黄海永

doi:10.3799/dqkx.2020.311

Volume 46 Issue 4

Apr. 2021

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Xu Yang, Yang Zhenning, Deng Xin, Wang Lingzhan, Liu Hao, Jin Xinbiao, Zhang Weifeng, Wei Yunxu, Peng Lianhong, Huang Haiyong, 2021. Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance. Earth Science, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311

Citation:

Xu Yang, Yang Zhenning, Deng Xin, Wang Lingzhan, Liu Hao, Jin Xinbiao, Zhang Weifeng, Wei Yunxu, Peng Lianhong, Huang Haiyong, 2021. Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance. Earth Science, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311

Citation:

Xu Yang, Yang Zhenning, Deng Xin, Wang Lingzhan, Liu Hao, Jin Xinbiao, Zhang Weifeng, Wei Yunxu, Peng Lianhong, Huang Haiyong, 2021. Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance. Earth Science, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311

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Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance

doi: 10.3799/dqkx.2020.311

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.
College of Resources, Hebei GEO University, Shijiazhuang 050031, China

Received Date: 2020-06-29
Publish Date: 2021-04-15

Abstract

Abstract

Recently, a series of the Late Mesoproterozoic to Neoproterozoic tectonic blocks in the southern part of the West Dabie orogenic belt were identified by geological field mapping. These tectonic blocks are distributed along NNW-SSE trending fault, from the Lüwang in the west, to the Gaoqiao and Yongjiahe in the east, forming a tectonic mélange belt within the West Dabie orogenic belt. This tectonic mélange belt is composed of various metamorphic blocks, including ultramafic to mafic rock, silica-pelitic rock, quartzose rock, marble, carbonaceous clastic rock, bimodal volcanic rock, and eclogites. The matrix mainly consists of mica schist with strong deformation. Their protolith ages have a wide range that cluster as two age populations including 1 200-1 000 Ma and 800-700 Ma. Moreover, the 240-200 Ma ages are also recorded by the metamorphic zircons. On the basis of contact relationship and lithological assemblages, as well as their geochronologic and geochemical data, it is proposed that the tectonic blocks in the Lüwang-Gaoqiao-Yongjiahe tectonic mélange have two different geotectonic affinities, including the Late Mesoproterozoic to Early Neoproterozoic arc to back-arc basin system, and Middle to Late Neoproterozoic continental rift system. These blocks may have been brought into a deep depth by the subduction of the South China block beneath North China block during the Triassic, followed by subsequent exhumation to the surface and emplacement along the Taohua-Qijiaoshan fault. Furthermore, considering the close temporal and spatial relationships, it is inferred that the Late Mesoproterozoic to Early Neoproterozoic arc to back arc basin system in this study extended westward to the 970-820 Ma Dahongshan arc to back arc basin and 1 100-1 000 Ma Miaowan ophiolite.
- zircon U-Pb-Hf isotope,
- Indosinian tectonic mélange belt,
- Late Mesoproterozoic block,
- northern margin of Yangtze craton,
- structural geology

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