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《GEOSCIENCE》 1999-01
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STUDY ON THE HANGING WALL ROCK ALTERATION AND TYPO MORPHIC CHARACTERISTICS OF PYRITES IN CANGSHANG GOLD DEPOSIT,NORTHWESTERN JIAODONG

Yang Zhusen Chen Guangyuan Sun Daisheng Wang Zhijing(China University of Geosciences, Beijing, 100083)Yuan Dongcheng Song Zhaofa(Cangshang Gold Mine, Laizhou, 261417)  
It is important for gold prospecting to study the alteration and mineralization of hanging wall rock of gold deposit because that the hanging wall rock is first encountered during drilling in ore prospecting and exploration. Detailed studies in the open pit in Cangshang gold deposit, northwestern Jiaodong, indicate that the main alteration of hanging wall rock is chloritization, and the alteration zonation can be divided into calcitization chloritization zone, hematitization chloritization zone, epidotization zone, and phyllic alteration zone from the hanging wall rock to the ore body. The typomorphic characteristics of pyrite, which is crystal form, chemical composition and thermoelectricity show that many ore forming elements such as Fe, Co, Ni, Cu, Pb, Zn, Au and Pt were taken out from the hanging wall rock during mineralization. The indicators of closing to ore body in the hanging wall rock are the strengthening of phyllic alteration, the increasing of {100}+{210} crystal form of pyrite, the percentage of P type pyrite, the gold content in altered rock, and the contents of S,Cu,Pb,Zn,Au and Pt in pyrite, and the decreasing of the ratio of S 2- /Fe 2+ and w (Co+Ni)/ w (As+Sb).
【Fund】: 国家科委攀登计划
【CateGory Index】: P618.510.5
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