【摘要】 新地沟金矿床产于新太古界色尔腾山群绿片岩系中,属层控绿岩型金矿床。矿床流体包裹体研究表明,矿床形成于中温(220～320℃)、中等深度(2.8～3.8km),压力降低流体发生相分离的条件下。主成矿阶段矿液属低盐度(为1.2～3.5Wt%NaCl)的Cl--Na+-K+型溶液。矿石中石英的包裹体成分比值特点及包裹体氢-氧同位素特征表明,成矿流体具深部来源特征,为深部原始岩浆水与天水或地下水混合来源。矿床硫同位素组成接近陨石值,属深源硫,矿石铅亦具深部来源特征,表明成矿物质来源于地壳深部或上地幔与下地壳之过渡带。上述矿床地球化学特征进一步证实该矿床属层控绿岩型金矿类型。更多还原

【Abstract】 Xindigou gold deposit occurring in the greenschist series of the Neoarchean Sertengshan Group, belongs to greenstone-type gold deposit in Daqing Mts., Inner Mongolia. Based on the （study） on the fluid-inclusion geochemistry of the ore deposit, it is suggested that the ore formed under the conditions of middle temperature（220 ～ 320 ℃）,middle depth（2.8 ～ 3.8 km）and the fluid phases （separating） with the pressure decreasing. And the ore-forming fluid belongs to the Cl^--Na⁺-K⁺ type with low salinity（1.2 ～ 3.5 Wt%（NaCl））,and it originally derived from the magma water mixxing with meteoric water in its evolution according to the isotopes of hydrogen, oxygen (δD_water -67.30‰ to -98.90‰, δ¹⁸O_water 2.662‰ to 6.985‰). And the Pb isotope and δ³⁴S of the sulfides in the ore suggest that the ore-forming substance derived from the deep part of the crust or the transitional belt between the upper mantle and lower crust.更多还原