【摘要】 矿床产于上泥盆统大乌石组底部的一套碎屑岩夹碳酸盐岩地层中 ,受区域上东西向茶头山、大塘岭断裂带控制 ,层间破碎带和东西向断裂为其容矿构造。矿床的铅同位素组成为 2 0 6 Pb/2 0 4 Pb=1 8.5 80～ 1 8.63 4,2 0 7Pb/ 2 0 4 Pb=1 5 .667～ 1 5 .746,2 0 8Pb/ 2 0 4 Pb=3 8.82 8～ 3 9.0 42 ,模式年龄为 89～ 1 86Ma。方铅矿和闪锌矿的 δ34 S=-0 .93‰～ 3 .2 3‰。含矿围岩及矿石的 δ1 3C=-5 .86‰～ -1 .5‰ ,δ1 8O=8.65‰～ 9.2 4‰。流体包裹体的均一温度为 1 2 0～ 3 70℃ ,呈双峰态分布 ,峰值分别为 1 70～ 1 90℃、2 40～ 2 60℃。成矿流体的盐度 w( Na Cl)为 7%～ 1 0 %。地质地球化学特征说明荷树下矿床是一个浅成中低温岩浆源矿床 ,成矿物质主要来自中生代岩浆 (体 ) ,部分来自地层 ,成矿时代为燕山中晚期。更多还原

【Abstract】 The Heshuxia lead-zinc deposit is hosted in the late Devonian volcaniclastic rock in the bottom of Dawushi Formation, controlled by EW-striked Chatoushan and Datangling fault zones as well as interlayer fracture belts. Orebodies are usually stratiform-like or veined and galena and sphalerite are the dominant components. Lead isotope compositions of the ores are as follows: 206Pb/ 204Pb=18.580～18.634, 207Pb/ 204Pb=15.667～15.746 and 208Pb/ 204Pb=38.828～39.042 with a model age ranging from 89 Ma to 186Ma. Sulfur isotope compositions(δ 34S) of galena and sphalerite change from -0.93‰ to -3.23‰. Carbon and oxygen isotope compositions of ore-bearing beds and ores are as the follows: δ 34S= -5.86‰～-1.5‰, δ 18O=8.65‰～9.24‰. Homogenization temperatures of fluid inclusions range from 120℃ to 370℃ with two peak temperatures respectively being 170～190℃ and 240～260℃. The salinity [w(NaCl)] of mineralization fluids changes from 7% to 10 %. The geochemical characteristics suggest that the deposit is an epithemal low-to-moderate temperature deposit with its ore-forming material and fluid mainly derived from Mesozoic magma and partly from the strata, and mineralization happened during middle to later Yanshanian Period.更多还原