[an error occurred while processing this directive] ������� 2019, 38(3) 721-730 DOI:   10.3969/j.issn.1004-5589.2019.03.013  ISSN: 1004-5589 CN: 22-1111/P

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Article by Zheng C
Article by Cui Y
Article by Hu P
Article by Xu X
Article by Liu Y
Article by Huang M
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2. ��Ȼ��Դ�������ǿ����Դ�����ص�ʵ����, ���� 130061
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Contact metamorphism of buried granite in the lower part of Yangjiazhangzi syncline, western Liaoning
ZHENG Chang-qing1,2, CUI Yi-bing1,2, HU Peng-yue1,2, XU Xue-chun1,2, LIU Yun-hu1,2, HUANG Ming-guo1,2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia of Ministry of Natural Resources, Changchun 130061, China
Abstract: Magnetotelluric sounding and borehole drilling are carried out to confirm the occurrence of concealed granite and its contacting metamorphism in the lower part of the Yangjiazhangzi syncline. Granites were encountered at 1 727 m at the Well JK-1 of Shangfuergou, 1 514.79 m at Well JK-2 of Nangou, and 1 159.92 m at Well JK-5 of Xiquegou, respectively. Magnetotelluric data also show that concealed granite occurred at depth between 1 160 to 1 750 m in the lower part of Yangjiazhangzi syncline, and is connected with the Hongluoshan batholith. Taking Well JK-5 of Xiquegou as an example, the thickness of contact metamorphic zone for the granite is~780 m. The inner part of contact metamorphic zone, i.e., hornfel-skarn zone, is~500 m thick, which was metamorphosed at pyroxene-hornfel facies, and accompanied by molybdenite mineralization. The middle part of contact metamorphic zone, i.e., diopside-marble zone, is~100 m thick, which was metamorphosed at hornblende-hornfel facies. The outer part of contact metamorphic zone composed of tremolite-bearing microcrystalline marble is 180 meters thick, which was at metamorphosed albite-epidote hornfel facies. The main ore bodies of the Yangjiazhangzi molybdenum deposit are produced in skarn and porphyritic granite in the contact zone of limestone and granite, which are skarn-porphyry type molybdenum deposit.
Keywords: contact metamorphism   concealed granite   magnetotelluric sounding   borehole   Yangjiazhangzi  
�ո����� 2019-03-13 �޻����� 2019-05-14 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2019.03.013
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