本文選題：山東招遠(yuǎn) + 河?xùn)|金礦��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：河?xùn)|金礦位于焦家斷裂帶的分枝斷裂一望兒山斷裂南段,礦體圍巖蝕變發(fā)育,構(gòu)造復(fù)雜。本文通過對(duì)河?xùn)|金礦成礦地質(zhì)特征、H-O-S穩(wěn)定同位素地球化學(xué)特征和流體包裹體的研究,礦床控礦條件的分析,探討成礦流體的性質(zhì)與成礦的關(guān)系以及該礦床的成礦機(jī)制,得出以下認(rèn)識(shí):(1)河?xùn)|金礦分布在NE向焦家斷裂帶的分支斷裂望兒山斷裂帶內(nèi)的破碎蝕變巖中,并受其控制。望兒山斷裂控制著成礦流體熱液活動(dòng),從而為河?xùn)|金礦床形成所需的成礦流體和成礦物質(zhì)提供了運(yùn)移通道和沉淀場(chǎng)所。(2)河?xùn)|金礦床的成礦作用與區(qū)內(nèi)郭家?guī)X花崗巖和玲瓏花崗巖沒有直接關(guān)系,它們僅是礦床的直接圍巖,根據(jù)區(qū)內(nèi)脈巖與礦床的空間和時(shí)間上的關(guān)系,河?xùn)|金礦的成礦作用應(yīng)該與區(qū)內(nèi)中基性脈巖有關(guān)。(3)H-O-S穩(wěn)定同位素地球化學(xué)研究表明,河?xùn)|金礦床成礦流體來源于幔源,到成礦中晚期,有大氣降水參與,表現(xiàn)為混合來源特征;河?xùn)|金礦硫源與郭家?guī)X花崗巖中硫的來源一致,成礦物質(zhì)來源于前寒武紀(jì)變質(zhì)基底巖石和白堊紀(jì)殼幔相互作用上涌的巖漿組分中所攜帶的成礦物質(zhì),具有混合來源特征。(4)根據(jù)流體包裹體顯微測(cè)溫結(jié)果,成礦流體溫度為222℃~302℃,屬于中低溫度熱液流體,熱液沿著斷裂裂隙充填并與圍巖發(fā)生水-巖反應(yīng)發(fā)生交代作用(如硫化作用),流體具有不混溶性,礦體分布在破碎蝕變巖帶中,礦石具有明顯的交代充填結(jié)構(gòu),據(jù)此推測(cè),河?xùn)|金礦應(yīng)該為中低溫?zé)嵋毫严冻涮罱淮g變巖型金礦床,流體的不混溶以及Au(HS)2-的溶解度降低可能是河?xùn)|金礦床金沉淀富集成礦的最主要因素。
[Abstract]:Hedong gold deposit is located in the south section of the branch fault-Wangershan fault of Jiaojia fault zone. Based on the study of the ore-forming geological characteristics of Hedong gold deposit, the stable isotopic geochemical characteristics of H-O-S and fluid inclusions, and the analysis of ore-controlling conditions of the deposit, the relationship between the ore-forming fluid properties and mineralization and the metallogenic mechanism of the deposit are discussed in this paper. The following conclusions are obtained: (1) the Hedong gold deposit is distributed in and controlled by the broken altered rocks in the Wangershan fault zone of the branch fault zone of the NE-trending Jiaojia fault zone. The Wangershan fault controls the hydrothermal activity of ore-forming fluids. The ore-forming process of the Hedong gold deposit is not directly related to the Guojialing granite and Linglong granite in the Hedong area, which provides a migration passage and a sedimentation place for the ore-forming fluids and ore-forming materials needed for the formation of the Hedong gold deposit. They are only the direct surrounding rock of the deposit. According to the relationship between dike rocks and the space and time of the deposit, the mineralization of Hedong gold deposit should be related to the stable isotopic geochemistry of the middle and basic dike rocks in the area. The ore-forming fluid of the Hedong gold deposit comes from mantle source, and from the middle to the late metallogenic period, there is the participation of atmospheric precipitation, which is characterized by mixed source, and the sulfur source of Hedong gold deposit is the same as that of Guojialing granite. The ore-forming materials derived from the Precambrian metamorphic basement rocks and the minerals carried in the Cretaceous crust-mantle interaction upwelling magma have mixed source characteristics. The ore-forming fluid temperature is 222 鈩，

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