| 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 |
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| 引用本文： | 刘晓通,王向军,安鹏瑞,孟令强,唐重阳,杨锋杰,陈雷,毛光周.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[J].山东国土资源,2018,34(6). |
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| 作者姓名： | 刘晓通 王向军 安鹏瑞 孟令强 唐重阳 杨锋杰 陈雷 毛光周 |
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| 作者单位： | 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;兖州煤业有限公司兴隆庄煤矿 |
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| 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。
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| 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 |
Characteristics of Main and Trace Elements and Geological Significance of Niujiaxiaohe Gold Deposit in Middle of Yishu Fault Belt |
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| LIU Xiaotong,WANG Xiangjun,AN Pengrui,MENG Lingqiang,TANG Chongyang,YANG Fengjie,CHEN Lei and MAO Gaungzhou.Characteristics of Main and Trace Elements and Geological Significance of Niujiaxiaohe Gold Deposit in Middle of Yishu Fault Belt[J].Land and Resources in SHANDONG Province,2018,34(6). |
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| Authors: | LIU Xiaotong WANG Xiangjun AN Pengrui MENG Lingqiang TANG Chongyang YANG Fengjie CHEN Lei and MAO Gaungzhou |
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| Abstract: | 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 NJXH1 sample; while metallogenic elements with low temperature enriched in NJXH2 sample. The variable coefficient of Yishui group is high, and oreforming 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 NJXH2 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 oreforming 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 oreforming fluid is weak reduction and metamorphic hydrotherm may participate in mineralization. |
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| Keywords: | Metallogenic materials oreforming fluid geochemistry ore origin Yishu fault belt Niujiaxiaohe area |
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