[an error occurred while processing this directive] ������� 2019, 38(3) 623-635 DOI:   10.3969/j.issn.1004-5589.2019.03.005  ISSN: 1004-5589 CN: 22-1111/P

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Article by Gan Y
Article by Dong Y
Article by Wang P
Article by Chen M
Article by Wang C
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Metamorphism and its geological implication of Al-rich gneiss in Wangjiapuzi of northern Xiuyan area, East Liaoning
GAN Yi-cheng, DONG Yong-sheng, WANG Peng-sen, CHEN Mu-sen, WANG Cheng-zhi
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The study on petrography and metamorphism of aluminum-rich gneiss occurred in South Liaohe Group in Wangjiapuzi of northern Xiuyan area,East Liaoning has been carried out. The peak mineral assemblage consists of garnet + sillimanite+cordierite+biotite+plagioclase+k-feldspar+quartz, and there is a typical decompression reaction of garnet+sillimanite+quartz��cordierite after peak stage. Early prograde metamorphic stage is characterized by the occurrence of staurolite and kyanite, whereas the late retrograde metamorphic stage is characterized by the transformation of garnet and biotite into chlorite. Traditional P-T estimation suggests that the metamorphic conditions for peak stage are 640��~690�� and 5.5~7.0 kbar of aluminum-rich gneiss, 560��~660�� and 4.7~4.9 kbar for post-peak near-isothermal decompression stage, and 520��~560�� and 2.9~3.0 kbar for late retrograde metamorphic stage. The characteristics of mineral assemblage, transition structure of mineral phase and P-T conditions of aluminum-rich gneiss indicate a clockwise P-T path with near isothermal decompression, which is different from the counterclockwise P-T path obtained by predecessors. The results show that South Liaohe Group and North Liaohe Group probably underwent the same metamorphic evolution process in Paleoproterozoic.
Keywords: Liao-Ji orogenic belt   South Liaohe Group   Al-rich gneiss   metamorphism   P-T path   East Liaoning  
�ո����� 2019-04-12 �޻����� 2019-04-20 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2019.03.005
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