黑龙江老柞山金矿标型矿物及其意义

发布时间：2018-06-20 01:09

  本文选题：老柞山金矿 + 地质特征　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：老柞山金矿田是黑龙江省重要的黄金产地之一,也是该省的第二大岩金矿床。本文通过对前人工作、资料的整理和概括,结合野外地质勘查及样品的处理,对矿区金矿物及标型矿物进行研究,为进一步探讨矿床成因、成矿形成温度和指导找矿提供依据。通过前人资料和实验分析得出了以下一些认识:老柞山金矿床位于黑龙江省双鸭山市、七台河市两市和宝清县的交界处。矿区出露的地层主要有古元古界兴东群大马河组(Pt1d)、中生界侏罗系上统(J3sh)及新生界第四系松散沉积层(Q4)。老柞山金矿的主要赋矿层位是兴东群大马河组(Pt1d)大理岩和大面积出露的混合岩。金矿田主要分为东矿带、中矿带和西矿带。东矿带分布在老柞山金矿区的北东部;中矿带矿体分布于矿区中部;西矿带矿体位于西南部。老柞山金矿矿区围岩蚀变种类较多,主要有硅化、矽卡岩化、钾化、碳酸盐化、绿泥石化等。老柞山金矿床热液作用分为早、晚两个成矿期,早成矿期分为磁黄铁矿-毒砂-方解石阶段、胶状黄铁矿-白铁矿-石英阶段和粗粒毒砂-方解石-石英阶段三个成矿阶段,晚成矿期可分为纯石英阶段、粗粒毒砂-石英脉阶段、细粒毒砂-多金属硫化物-石英和方解石-石英阶段四个成矿阶段。矿石中自然金的颗粒粗粒不均,形态多为等轴状,次为不规则状,金呈明金的形式主要存在于毒砂、黄铁矿中。实验结果表明金以包裹体金、粒间金形式赋存于毒砂、磁黄铁矿等矿物中。通过对黄铁矿、毒砂、磁黄铁矿、黄铜矿和闪锌矿进行显微镜下观察和电子探针分析可知,以上五种矿物金矿化比较普遍,均可作为载金矿物。部分标型矿物主量元素和微量元素可以反映标型矿物的成矿温度,通过实验分析,该矿区成矿温度可能形成中高温和较深的环境下。
[Abstract]:Laozuoshan gold ore field is one of the important gold producing areas in Heilongjiang Province and the second largest rock gold deposit in the province. In this paper, through the collation and generalization of previous work and data, combined with field geological exploration and sample processing, gold deposits and standard minerals in the mining area are studied, which provides the basis for further discussion on the genesis of the deposit, the metallogenic temperature and the guidance for prospecting. Based on the previous data and experimental analysis, the following conclusions are obtained: Laozuoshan gold deposit is located at the junction of Shuangyashan City, Qitaihe City and Baoqing County, Heilongjiang Province. The strata exposed in the mining area are mainly composed of Pt1dU of the Dama River formation of the Xindong Group of the Paleoproterozoic, and J3sh of the Upper Jurassic of the Mesozoic, and the loose sedimentary bed Q4 of the Quaternary of the Cenozoic. The main ore-bearing strata of Laozuoshan gold deposit are marble of Damahe formation of Xingdong group and mixed rock of large area. The gold ore field is mainly divided into east ore belt, middle ore belt and west ore belt. The east ore belt is located in the north and east of Laozuoshan gold deposit, the middle ore belt is located in the middle of the mining area, and the west ore belt is located in the southwest. There are many kinds of alteration in the surrounding rock of Laozuoshan gold mine, such as silicification, skarn, potassium, carbonation, green mud and so on. The hydrothermal process of Laozuoshan gold deposit can be divided into early and late metallogenic periods, and the early metallogenic period is divided into three stages: pyrrhotite-arsenopyrite-calcite-quartz, colloidal pyrite-albite-quartz and coarse-grained arsenopyrite-calcite-quartz. The late metallogenic period can be divided into four stages: pure quartz stage, coarse arsenopyrite quartz vein stage, fine granulated arsenopyrite polymetallic sulphide quartz stage and calcite quartz stage. The coarse grain of natural gold in the ore is uneven, the shape is equiaxed and irregular, the form of gold is mainly in arsenopyrite and pyrite. The results show that gold occurs in the form of inclusions and intergranular gold in arsenopyrite, pyrrhotite and other minerals. Through the microscopic observation and electron probe analysis of pyrite, arsenopyrite, pyrrhotite, chalcopyrite and sphalerite, it can be seen that the gold mineralization of the above five minerals is quite common and can be used as gold carrier. The main elements and trace elements of some standard minerals can reflect the metallogenic temperature of the standard minerals. Through the experimental analysis, the ore-forming temperature of this ore area may be formed in a medium high temperature and deeper environment.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51
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本文编号：2042205