Geological and Geochemical Characteristics and Genesis of the Shaxi Porphyry Copper (Gold) Deposits, Anhui Province |
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| Authors: | XU Zhaowen QIU Jiansheng REN Qijiang XU Wenyi NIU Cuiyi and Fu Bin |
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| Institution: | XU Zhaowen,QIU Jiansheng,REN Qijiang,XU Wenyi,NIU Cuiyi and Fu Bin Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu Department of Earth and Space Sciences,University of Science and Technology of Chin,Hefei,Anhui Fei Zhenbi |
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| Abstract: | Abstract The Shaxi porphyry copper (gold) deposits are a typical example of porphyry copper deposits associated with diorite in eastern China. Quartz diorite, which hosts the deposits, has a Rb-Sr isochron age of 127.9 ± 1.6 Ma. Geochemically, the rock is rich in alkalis (especially sodium), light rare earth elements (LREE) and large-ion lithophile elements (LILE), and has a relatively low initial strontium isotopic ratio (Isr=0.7058); thus it is the product of differentiation of crust-mantle mixing source magma. The model of alteration and mineralization zoning is similar to the Hollister (1974) diorite model. The ore fluids have a relatively high salinity and contain significant amounts of CO2, Ca2+, Na+ and ***CI?. The homogenization temperatures of fluid inclusions for the main mineralization stage range from 280 to 420°C, the δ18O values of the ore fluids vary from 3.51 to 5.52 %, the δD values are in the range between ?82.4 and ?59.8 %, the δ34S values of sulphides vary from ?0.3 to 2.49 %, and the δ13C values of CO2 in inclusions range between ?2.66 and ?6.53 %. Isotope data indicate that the hydrothermal ore fluids and ore substances of the Shaxi porphyry copper (gold) deposits were mainly derived from magmatic systems. |
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| Keywords: | geological and geochemical characteristics genesis of the deposit porphyry copper (gold) deposit Shaxi Anhui |
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