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Deformation Stages and Ar-Ar Age Data of the Wan-Zhe-Gan Tectonic Zone,Southeast China,and Their Tectonic Significance

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1373-1389页

作者： YU Xinqi WANG De＇en JIANG Dazhi JIANG Laili ZHOU Xiang LI Chunlin State Key Laboratory of Geoprocesses and Mineral Resources China University of Geosciences Beijing 100083 China No. 332 Geological Team of Anhui Bureau of Geology and Mineral Resources Huangshan Anhui 245000 China Department of Earth Sciences University of Western Ontario London Ontario Canada N6A 5B7 Anhui Institute of Geological Survey Hefei Anhui 230001 China

The major tectonic zone that passes through the border regions of the Anhui, Zhejiang, and Jiangxi Provinces in southeast China has been commonly referred to as the Wan-Zhe-Gan fault zone. Geologically, this zone consists of several regional fault belts of various ages and orientations. We have categorized the faults into four age groups based on field investigations. The Neoproterozoic faults are northeast striking. They start from the northeast Jiangxi Province and extend northeastward to Fuchuan in Anhui Province, the same location of the northeast Jiangxi-Fuchuan ophiolite belt. The faults probably acted during the Neoproterozoic as a boundary fault zone of a plate or a block suture with melange along the faults. The nearly east-west- or east-northeast-striking faults are of Silurian ages （40Ar/39Ar age 429 Ma）. This group includes the Qimen-Shexian fault and the Jiangwang-Jiekou ductile shear belt. They represent a major tectonic boundary in the basement because the two sides of the fault have clear dissimilarities. The third group of faults is north-northeast striking, having formed since the early-middle Triassic with 40Ar/39Ar ages of 230-254 Ma. They form a fault belt starting from Yiyang in northern Jiangxi and connect with the Wucheng as well as the Ningguo-Jixi faults. This fault belt is a key fault-magmatic belt controlling the formation of Jurassic-Cretaceous red basins, ore distribution, magmatic activity, and mineralization. When it reactivated during the late Cretaceous, the belt behaved as a series of reverse faults from southeast to northwest and composed the fourth fault group. Therefore, classifying the Wan-Zhe-Gan fault zone into four fault groups will help in the analysis of the tectonic evolution of the eastern segment of the Jiangnan orogen since the Neoproterozoic era.

关键词： The Wan-Zhe-Gan fault zone changes of orientations different evolution stages 40Ar/39Ar geochronology the border region of Zhejiang Jiangxi and Anhui Provinces

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