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Geochemical Characteristics And Genesis Of Xiajinbao Au Deposit, Pingquan, Hebei Province

Posted on:2015-03-03Degree:MasterType:Thesis
Country:ChinaCandidate:H B LiFull Text:PDF
GTID:2180330434953405Subject:Geology
Abstract/Summary:PDF Full Text Request
Abstract:Xia Jin Bao gold deposit which is gold-polymetallic ore deposit belongs to Pingquan Xia Ying Fang Gold Mine.Base on the study of ore-forming processes condition,ore deposit geochemical characteristics,fluid inclusion and the analysis of metallogenic geologic conditions,this thesis focus on the investigation of ore-forming materials sources,ore-controlling factors,genesis of mineral deposit etc. The achievements and innovations are followed:1.The rock body of Xia Jin Bao which is light rare earth enrichment belongs to silicate rock of supersaturated calcium alkaline rocks. The Formation environment of the rock is not stable. Rare earth elements analysis shows that light rare earth have a enrichment. Rock body with Eu negative anomaly, La/Sm and La relations into a smooth curve, that indicate it have a crystallization separation process in the formation of magmatic rocks, LREE/REE greater than1, that indicat the light rare earth have a concentration, combinate with the Y-Nb and Igt-lgσ relations analysis, the tectonic environment of the rock body should be the volcanic rocks in orogenic belt.2.The result of microelement variation in rock body of Xia Jin Bao shows that the rock body could be formed as the lower crust rocks deep melting or remelting, hence the rock body was magma contaminated with the upper mantle material.3.To study the metal sulfide mineral typomorphic characteristics, the electron probe test method have been employed. The results show that in the pyrite, S/Fe<2, w(Mo) is0.5%-0.7%, w(Co)is more than w(Ni), that indicate the metal sulfide in this area conforms to be the sub-volcanic hydrothermal type gold iron ore.4.The analysis of characteristics of isotopes and fluid inclusions led the solution of issue in ore-forming materials and sources of ore-forming fluid, and the conclusions declare that ore-forming materials and sources are derived from granite porphyry and old strata and the metallogenic fluid is medium-high heat,medium-high density,High salinity of fluid which came from the magmatic water. The union type of metallogenic fluid is H2O-CO2-K+(Na+)-Cl--SO42-.5.The magma of Xia Jin Bao area is the source of materials, fluid and heat, and most likely the stratum play the same role as well. Geological structure is the necessary factors of the ore-forming to control the magmatic emplacement and the position setting of ore body, furthermore, the structure provide the enough place, especially for the sub-tectonic position among the fractures of bed rock and metamorphic rock or fault structure.6.Combining the study of the geological characteristics, ore deposit geochemical characteristics of ore deposits in this area,and analysis of the ore-forming geological conditions, the source of ore-forming materials, ore-controlling factors and metallogenesis of analysis, conclusion have been made to indicate the Jinbao gold mine is a type of porphyry deposit related to sub-volcanic hydrothermal.
Keywords/Search Tags:Xiajinbao Au deposit, geological characteristics, geochemicalcharacteristics, ore deposit genesis
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