内蒙古哈达门沟—柳坝沟金矿田成因矿物学与找矿矿物学研究

发布时间：2018-04-08 10:12

本文选题：成因矿物学　切入点：矿物标型　出处：《中国地质大学(北京)》2015年硕士论文

【摘要】：华北地台北缘是我国重要的金矿床(点)聚集区,成矿地质条件非常优越,是进行金矿勘探的理想区块。哈达门沟-柳坝沟金矿床位于位华北地台北缘,是一类与钾长石化关系密切的超大型金矿床。本文在综合研究前人研究成果的基础上,从成因矿物学与找矿矿物学角度,对与成矿关系密切的黄铁矿、石英、钾长石矿物进行研究,并通过哈达门沟-柳坝沟金矿床对比研究成果,为矿区深部预测提供有用的信息。研究区黄铁矿均为N型导电类型,柳坝沟黄铁矿形成温度主要集中于260oC~360oC,哈达门沟矿区形成温度主要集中于205 oC~289oC。晶胞参数ao介于0.54167~0.54252nm之间,略大于理论值,与高程呈负相关。黄铁矿以强烈富集Mo、Pb元素,强烈亏损Cr、Rb、Nb等元素为主要特征。(Co+Ni)/As比值较大、As含量极低是该矿床的典型标型特征。石英晶胞参数与高程呈一定的正相关关系。微量元素以强烈富集Mo、As、Ba、Pb,相对富集Sr为特征。钾长石微量元素以Ba、Pb的强烈富集和Cr、Ni、Zr、Nb、Hf、Ta元素的强烈亏损为主要特征。黄铁矿亏损Nb、Ta、Zr、Hf等高场强元素,相对富集LREE,Hf/Sm、Nb/La和Th/La值均小于1,说明成矿流体是富Cl的流体。成矿阶段黄铁矿、石英、钾长石稀土元素具明显的铕正异常,表明成矿流体是一种中高温强还原性流体。综合黄铁矿热电性、晶胞参数和石英晶胞参数研究成果,认为柳坝沟矿区较哈达门沟矿区剥蚀程度小,深部有很大的找矿潜力。313号脉东段是下一步找矿工作的重点区域。哈达门沟矿区28、62号脉相对矿区内其他脉体剥蚀程度较小,具有较好的找矿潜力。
[Abstract]:The Taibei margin of North China is an important gold deposit (spot) accumulation area in China with excellent metallogenic geological conditions and is an ideal area for gold exploration.The Hadamengou-Liubagou gold deposit, which is located on the Taipei margin of the North China platform, is a kind of super large gold deposit closely related to the potash petrifaction.In this paper, based on the comprehensive study of the previous research results and from the perspective of genetic mineralogy and prospecting mineralogy, the pyrite, quartz and potash feldspar minerals, which are closely related to metallogenesis, are studied in this paper.The results of comparative study on the Hadamengou-Liubagou gold deposit provide useful information for the deep prediction of the ore area.The pyrite in the study area is of N-type conductive type. The formation temperature of Liubagou pyrite is mainly concentrated at 260oCn360oC, and the formation temperature of Hadamenggou mine is 205oC ~ (289oC).The unit cell parameter ao is between 0.54167~0.54252nm, slightly larger than the theoretical value, and negatively correlated with height.Pyrite is characterized by strong enrichment of Mo-Pb elements and strong depletion of Cr-RbNb, etc. The typical typomorphic characteristics of the deposit are the high ratio of Ni)/As and the extremely low content of as.There is a positive correlation between quartz cell parameters and height.The trace elements are characterized by strong enrichment of Mo-As-BaPb and relative enrichment of Sr.The main characteristics of the potassium feldspar trace elements are the strong enrichment of Bahl Pb and the strong depletion of the elements such as Cr, Ni, Zr, NB, HfU, Ta.Pyrite is depleted in high field strength elements such as TaZrZrHf, and is relatively enriched in LREEN HF / SmNb / La and Th/La values less than 1, indicating that the ore-forming fluid is a Cl-rich fluid.In the metallogenic stage, the rare earth elements of pyrite, quartz and potassium feldspar have obvious europium positive anomalies, indicating that the ore-forming fluid is a medium and high temperature strongly reductive fluid.Based on the research results of pyrite thermoelectric properties, unit cell parameters and quartz cell parameters, it is considered that the denudation degree of Liubagou mining area is smaller than that of Hadamenggou mining area, and the east section of No. 313 vein in the deep part is the key area of the next prospecting work.Compared with other veins in Hadamenggou mining area, No. 28C62 vein has a relatively small denudation degree and has better prospecting potential.
【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】：2015
【分类号】：P618.51

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