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引用本文:高菊生1 王瑞廷1 张复新2 齐亚林2 梁小勇1. 南秦岭寒武系黑色岩系中夏家店金矿床地质地球化学特征[J]. 中国地质, 2006, 33(6): 1371-1378.
GAO Ju-sheng1, WANG Rui-ting1, ZHANG Fu-xin2, QI Ya-lin2, LIANG Xiao-yong1. Geology and geochemistry of the Xiajiadian gold deposit in the Cambrian black rock series in the South Qinling[J]. Geology in China, 2006, 33(6): 1371-1378(in Chinese with English abstract).
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南秦岭寒武系黑色岩系中夏家店金矿床地质地球化学特征
高菊生1 王瑞廷1 张复新2 齐亚林2 梁小勇11,2
1.西北有色地勘局713总队,陕西 西安 710054;2.西北大学地质系,陕西 西安 710069
摘要:
提要:研究取得如下成果和认识:确定了微细浸染型金矿床赋存于含矿性好的重晶石-硅质岩热水沉积岩系之中;矿床形成经历同生沉积成矿预富集,韧-脆性剪切构造叠加和后生热液改造金的工业富集过程,与本区古大陆俯冲-碰撞造山大地构造演化密切耦合。成矿作用共划分为3期8阶段,矿石由3类11亚类型组成,体现出复杂改造的成矿过程。矿化矿物流体包裹体均一温度集中在199~300℃,成矿压力为370×105~820×105 Pa,具中-低温热液成矿特征;成矿早期流体包裹体盐度3.27(NaCl)%,中晚期5.25(NaCl)%;6件矿化矿物氢氧同位素组成δ18OH O为-7.86‰~0.37‰,δDH O为-80.70‰~66.30‰,具有由大气降水向右横向漂移的以天水为主的成矿流体受到较强烈的改造;金矿床属于热水沉积-韧脆性构造叠加-大气降水为主含矿热液改造的微细粒浸染型(类卡林型)金矿床。
关键词:  热水沉积岩系  矿床地质地球化学  微细浸染型(类卡林型)金矿床  夏家店  南秦岭
DOI:
分类号:
基金项目:国家自然科学基金项目(40572065)与西北有色地勘局项目联合资助。
Geology and geochemistry of the Xiajiadian gold deposit in the Cambrian black rock series in the South Qinling
GAO Ju-sheng1, WANG Rui-ting1, ZHANG Fu-xin2, QI Ya-lin2, LIANG Xiao-yong11,2
1. 713 Party, Northwest Bureau of Geology and Mineral Exploration, China National Nonferrous Metals Industry Corporation (CNNC), Xi'an 710054, Shaanxi, China;2. Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China
Abstract:
Abstract:Study of the Xiajiadian gold deposit, South Qinling, has led to the following understanding: microdisseminated gold deposits are hosted in gold-rich barite-chert hydrothermal sedimentary rock series, and the formation of the ore deposits has gone through synsedimentary preconcentration and a process of industrial concentration from brittle-ductile shear structural overprinting to post-hydrothermal reworking. The gold mineralization has close coupling relations to the tectonic evolution of continental subduction-collisional orogeny in the area. The ore-forming processes of this gold deposit may fall into three epochs and eight stages. The ores are composed of three types and eleven subtypes, showing complex ore-forming processes. The homogenization temperatures of fluid inclusions in ore minerals cluster at the range of 199-300℃ and the mineralization pressures range from 370×105 to 820×105 Pa, showing the features of meso- and epithermal mineralization. The salinities of the fluid inclusions were 3.27 wt.% NaClequiv. in the early mineralizing stage and 5.25 wt.% NaClequiv. in the middle and late stages. The hydrogen and oxygen isotopic compositions of the ore minerals form six samples are δ18OH O=-7.86‰ to +0.37‰ and δDH O=-80.70‰ to -66.30‰. The data points in the plot shift laterally from meteoric water to the right, suggesting that the ore fluids consisting predominantly of meteoric water have been subjected to intense reworking. The Xiajiadian gold deposit is a microdisseminated (Carlin-like type) gold deposit. The mineralization has the features of hydrothermal deposition-brittle-ductile structural overprinting-reworking of hydrothermal ore fluids dominated by meteoric water.
Key words:  exhalation-sedimentary  geology-geochemistry of gold deposit  microdisseminated (Carlin-like type) gold deposit  Xiajiadian gold deposit  South Qinling