沂沭断裂带中段牛家小河金矿主微量元素特征与地质意义  

Characteristics of Main and Trace Elements and Geological Significance of Niujiaxiaohe Gold Deposit in Middle of Yishu Fault Belt

作　　者：刘晓通[1,2] 王向军 安鹏瑞 孟令强 唐重阳 杨锋杰 陈雷[1] 毛光周 LIU Xiaotong;WANG Xiangjun;AN Pengrui;MENG Lingqiang;TANG Chongyang;YANG Fengjie;CHEN Lei;MAO Gaungzhou(Key Laboratory of Sedimentary Metallogeny and Sedimentary Mineral Resources of Shandong University of Science and Technology,Shandong Qingdao 266590, China;Shandong Institute of Geological Sciences,Key Laboratory of Gold Mineralization Processes and Resources Utilization Subordinated to the Ministry of Land and Resources,Shandong Key Laboratory of Geological Processes and Resource Utilization in Metallic Minerals,Shandong Jinan 250013, China;Xinglongzhuang Coal Mine of Yanzhou Coal Mining Limited Company, Shandong Jining 272100, China)

机构地区：[1]山东科技大学,山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266590 [2]山东省地质科学研究院,国土资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室,山东济南250013 [3]兖州煤业有限公司兴隆庄煤矿,山东济宁272100

出　　处：《山东国土资源》2018年第6期8-16,共9页Shandong Land and Resources

基　　金：国土资源部金矿成矿过程与资源利用重点实验室和山东省金属矿产成矿地质过程与资源利用重点实验室开发课题(2013003);国家自然科学基金项目(41572063,41772125);山东省沉积成矿作用与沉积矿产重点实验室开放课题(DMSM201403)联合资助

摘　　要：牛家小河金矿是沂沭断裂带内破碎蚀变岩型金矿的典型代表。通过对牛家小河金矿中矿石、围岩的岩石学特征及其主、微量元素地球化学特征研究发现,矿石NJXH-1富集Fe,Co,Ni等成矿温度较高的成矿元素,矿石NJXH-2相对富集低温成矿元素;沂水岩群成矿元素具有较高的变异系数且分布极不均匀,表明沂水岩群可能是牛家小河金矿的主要矿源层;矿石REE配分曲线均为轻稀土富集型,矿石NJXH-2与沂水岩群的稀土元素分布特征相似,矿石NJXH-2与沂水岩群具有同源性;矿石的Y/Ho特征显示成矿流体可能来自变质热液。综合分析认为,牛家小河金矿可能经历了两期成矿作用,且成矿温度存在一定差异;成矿物质可能来源于沂水岩群和燕山期花岗岩。成矿流体显示弱还原性,变质热液也可能参与成矿作用。Niujiaxiaohe gold deposit is a typical representative of the fractured altered rock type gold deposit in Yishu fault belt.Through study on petrological characteristics of ores and country rocks,and geochemical characteristics of main and trace elements,it is found that metallogenic elements with high metallogenic temperature,such as Fe,Co and Ni enriched in NJXH-1 sample;while metallogenic elements with low temperature enriched in NJXH-2 sample.The variable coefficient of Yishui group is high,and ore-forming elements distribute unevenly.It indicates that it is the main source bed of Niujiaxiaohe gold deposit.The REE distribution curve is rare earth element enrichment type.The characteristics of REE distribution from the ore of NJXH-2 are similar to these from Yishui group.It indicates that they may be from the same source.The characteristics of Y/Ho in the ore shows that the ore-forming fluids may come from metamorphic hydrotherm.Through summary and analysis,Niujiaxiaohe gold deposit may experience two stages of mineralization,and there is a significant difference in mineralization temperature.The main source of metallogenic minerals may come from granites in Yishui group and Yanshan period.The ore-forming fluid is weak reduction and metamorphic hydrotherm may participate in mineralization.

关 键 词：成矿物质 成矿流体 地球化学 矿床成因 沂沭断裂带 牛家小河 

分 类 号：P618.5[天文地球—矿床学]