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Journal of Geological ResearchVolume 2012 2012, Article ID 369513, 8 pages

Research Article

Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Institute of Geology and Geophysics, The Chinese Academy of Sciences, Beijing 100029, China

MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China

Received 10 May 2012; Revised 31 July 2012; Accepted 22 August 2012

Academic Editor: Yi-Wen Ju

Copyright © 2012 Quanlin Hou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A previous study of the Dabie area has been supposed that a strong extensional event happened between the Yangtze and North China blocks. The entire extensional system is divided into the Northern Dabie metamorphic complex belt and the south extensional tectonic System according to geological and geochemical characteristics in our study. The Xiaotian-Mozitan shear zone in the north boundary of the north system is a thrust detachment, showing upper block sliding to the NNE, with a displacement of more than 56 km. However, in the south system, the shearing direction along the Shuihou-Wuhe and Taihu-Mamiao shear zones is tending towards SSE, whereas that along the Susong-Qingshuihe shear zone tending towards SW, with a displacement of about 12 km. Flinn index results of both the north and south extensional systems indicate that there is a shear mechanism transition from pure to simple, implying that the extensional event in the south tectonic system could be related to a magma intrusion in the Northern Dabie metamorphic complex belt. Two

Ar-

Ar ages of mylonite rocks in the above mentioned shear zones yielded, separately, ~190 Ma and ~124 Ma, referring to a cooling age of ultrahigh-pressure rocks and an extensional era later.





Author: Quanlin Hou, Hongyuan Zhang, Qing Liu, Jun Li, and Yudong Wu

Source: https://www.hindawi.com/



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