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ORIGIN OF ZHILINGTOU Au Ag DEPOSIT IN ZHEJIANG PROVINCE |
Ji Guiqing1, Shao Jun2 |
1. Ji'nan Geological Artisan School, Shandong; 2. Shenyang Institute of Geology and Mineral Resources |
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Abstract The ore bodies in Zhilingtou Au-Ag deposit,Zhejiang Province, are chalcedonic quartz veins containing adularia and rhodonite The ores occur in circular-zonal structure and grained,metasomatic and poikiloblastic texture Wall rocks are strongly altered and with typical features of epithermal alteration Ore-forming fluid is low-salinity,approximate neutral and reduced hydrothermal The S and Pb isotopes of the Au-Ag doposit suggest that the ore forming materials are mostly from deep crust(down to upper mantle) The ore-forming hydrothermal is derived from magmatic water and meteoric water,and evolves as low temperature hydrothermal suggested by H,O and C isotopes The mineralization of Zhilingtou Au-Ag doposit are genetically associated with hypabyssal magmatic activities in Caledonian period It is a typical epithermal or sub volcanic hydrothermal Au-Ag deposit.
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Received: 29 May 1998
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