摘要:
槐树坪金矿是豫西熊耳山地区新发现的大型含金石英脉型金矿床,成矿具有多期次性等特点.为确定槐树坪金矿成矿物质共生组合及成矿期次,通过地球化学数据多元统计分析,得出矿床中Au的富集与成矿指示元素Bi、Ag密切相关,其中与Au矿化阶段相一致的3个主要阶段为:As-Ag-Hg组合沉淀作用阶段、Pb-Zn多金属硫化物矿化阶段和Cu-W-Mo组合沉淀作用阶段.通过岩矿鉴定及野外调研确定的矿石矿物共生组合为(黄铁矿、赤铁矿)—白铁矿—闪锌矿—方铅矿—(黄铜矿、斑铜矿)—蓝辉铜矿;围岩蚀变组合为钾长石、石英、黑云母、高岭土、方解石、白云石、绢云母、绿泥石、绿帘石.矿床成矿期次可划分为蚀变期、热液期及表生期,热液期又包括乳白色石英脉阶段、烟灰色石英—多金属硫化物阶段、白色石英脉—黄铁矿细脉状矿化阶段和石英—碳酸盐化阶段.
关键词:
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成矿物质
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共生组合
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成矿期次
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金矿
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槐树坪
Abstract:
The Huaishuping gold deposit is a large quartz vein gold deposit recently discovered in the Xionger Mountain of western Henan Province. The mineralization has the characteristics of multiple periods, and determining the gold metallogenic material associa-tion and metallogenic period of this ore deposit would be helpful to further development of the geological prospecting work . The multiva-riate statistical analysis of geochemical data shows that the enrichment of Au is closely related to the elements of Bi, Ag, the main ore-forming stages of Au is consistent with the As-Ag-Hg combination precipitation phase, the Pb-Zn polymetallic sulfide mineralization stage and the Cu-W-Mo combination precipitation phase. As shown by rock and ore appraisal and field survey, the paragenetic associa-tion of minerals is ( pyrite, hematite) -marcasite-sphalerite-galena-( chalcopyrite, bornite) -digenite, whereas the wall rock al-teration assemblage is potassium feldspar,quartz, biotite, kaolin clay, calcite, dolomite, sericite, chlorite, and epidote. The metallo-genic period can be divided into alteration period,hydrothermal period and supergene period, whereas the hydrothermal period can be divided into milky-white quartz vein stage,gray quartz-polymetallic sulfide stage, white quartz vein-pyrite veinlet mineralization stage and quartz-carbonatization stage.
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