投稿时间：2016-08-30
修订日期：2017-01-09
网络发布日期：2017-05-13
中文摘要:谢家沟金矿床位于胶东隆起西北缘的焦家断裂带和招平断裂带之间。矿床赋存在中生代玲珑花岗岩体中，矿体主要受NNE向和NNW向断裂构造控制，主要呈脉状或透镜状产出。矿石矿物主要有黄铁矿、黄铜矿、方铅矿、闪锌矿、自然金、银金矿以及少量的碲银矿和辉银矿。围岩蚀变主要有钾长石化、硅化、黄铁绢英岩化、绿泥石化和碳酸盐化等。成矿作用从早到晚可划分为4个阶段：石英-黄铁矿阶段（Ⅰ）、石英-绢云母-黄铁矿阶段（Ⅱ）、石英-多金属硫化物阶段（Ⅲ）、碳酸盐-萤石阶段（Ⅳ）。流体包裹体显微测温和激光拉曼成分分析表明，成矿早期流体温度为308~377℃，盐度为6.29%~8.55%，压力为350 MPa，属于H2
O-CO2-NaCl流体体系；主成矿期的流体温度为226~331℃，盐度为4.87%~10.29%，压力为280~300 MPa，属于H2O-CO2-NaCl±CH4流体体系。包裹体显微测温及岩相学观察发现，主成矿期的成矿流体发生了不混溶作用，这可能是导致金矿化的主要原因之一。硫同位素研究表明，谢家沟金矿床主成矿期黄铁矿的δ34S值接近或略低于胶东典型金矿床成矿期黄铁矿的δ34S值，暗示这些金矿床的成矿物质可能来自相同的源区；氢、氧同位素对比研究表明，谢家沟金矿床成矿流体表现出较明显的岩浆水特征，可能有大气降水的参与，但参与程度较弱。大气降水与岩浆水混合引起的温度降低、挥发分含量的降低可能是导致金矿化的另一原因。
Abstract:The Xiejiagou gold deposit is one of numerous gold deposits in Jiaodong peninsula. Tectonically, it is located on the southwestern margin of Jiaodong uplift and between Jiaojia fault zone and Zhaoyuan-Pingdu fault zone. Orebodies are mainly controlled by NNE- and NNW- trending fracture structure. Gold mineralization is hosted in Mesozoic Linglong granite and consists of auriferous quartz veins and subordinate disseminated ores in the vein-proximal alteration zone. Ore-related hydrothermal alteration is dominated by sericite+quartz+sulfide assemblage close to gold veins, and K-feldspar, chlorite and carbonate alteration. Pyrite is the predominant sulfide mineral, locally coexisting with minor amounts of chalcopyrite, sphalerite, and galena. Gold occurs mostly as free gold and electrum enclosed in or filling microfractures of pyrite and quartz and is also present in equilibrium with hessite and argentite. Fluid inclusion studies suggest that gold was deposited at intermediate temperatures (226~331℃) from H2O-CO2-NaCl±CH4 fluids with moderate salinity (w(Nacleq) 4.87%~10.29%). δ34S values of pyrite range mainly from 5.9‰ to 7.8‰, which are close to or slightly less than the values of typical gold deposits in Jiaodong peninsula, suggesting that the ore-forming material of these gold deposits might have come from the same reservoir. In comparison with other deposits in Jiaodong peninsula, the hydrogen and oxygen isotopic composition shows that the ore-forming fluid of the Xiejiagou gold deposit was mainly from magmatic water accompanied by participation of meteoric water. The ore-forming fluids of the main mineralization stage exhibit features of multiple sources. Temperature decrease and fluid immiscibility constitute the important mechanism for deposition and enrichment of gold and other ore-forming elements.
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中图分类号：P618.31
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基金项目:本文得到国家自然科学基金项目（编号：41303008）和招金矿业股份有限公司"山东金亭岭金矿床成因模式及找矿靶区预测"项目资助
引用文本：
丁东胜,陈蕾,巩恩普,时文革,邵周伟,张永利.2017.山东谢家沟金矿床流体包裹体研究及成矿机制的探讨[J].矿床地质,36(2):345~363DING DongSheng,CHEN Lei,GONG EnPu,SHI WenGe,SHAO ZhouWei,ZHANG YongLi.2017.Fluid inclusion study and metallogenic mechanism of Xiejiagou gold deposit in Shandong Province[J].Mineral Deposits36(2):345~363
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