Ore-forming epoch of Hengjiang Pb-Zn-Cu deposit on western margin of Sanshui basin, Guangdong Province,and its significance in prospecting for Cenozoic copper deposits
Ore-forming epoch of Hengjiang Pb-Zn-Cu deposit on western margin of Sanshui basin, Guangdong Province,and its significance in prospecting for Cenozoic copper deposits
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作者：
W. Deng
三水盆地及其西缘地区新发现了长坑大型金存款、富湾超大型银存款、横江铅锌铜存款、茶山铅锌存款等矿床。本文报道了横江多金属存款矿床的成矿时代。矿石中石英包裹体的Rb-Sr等时线年龄为35 Ma，与40 Ar/39 Ar坪年龄37.39Ma一致。这一结果表明，横江多金属存款形成于新生代渐新世，晚于长坑Au存款和富湾银存款的形成。近年来，在横江发现的黄铜矿-辉铜矿-闪锌矿-方铅矿矿石中，铜含量较高（18.39%~19.72%），与三水盆地西缘自然铜及其他高铜矿点的形成相对应。这表明三水盆地及其边缘地区具有寻找新生代铜矿的潜力。
Some new ore deposits, such as the Changkeng large-size gold deposit, the Fuwan superlarge silver deposit, the Hengjiang Pb-Zn-Cu deposit and the Chashan Pb-Zn deposit, were discovered in Sanshui basin and its western marginal area. This paper has reported the ore-forming epoch of the Hengjiang polymetallic deposit. The Rb-Sr isochron age of fluid inclusions hosted within quartz from the ores is 35 Ma, in agreement with its ~ 40 Ar/ ~ 39 Ar plateau age of 37.39 Ma. This result shows that the Hengjiang polymetallic deposit was formed in the Oligocene period of Cenozoic era, later than the formation of the Changkeng Au deposit and the Fuwan Ag deposit. Recently, high content of copper (up to 18.39%～19.72%) was noticed in the chalcopyrite-chalcocite-sphalerite-galena ores from Hengjiang, which corresponds to the formation of native copper and other high Cu ore spots on the western margin of Sanshui basin. This suggests the potential of Sanshui basin and its marginal areas in search for Cenozoic copper deposits.