| Jiangxi Copper Yinshan polymetallic deposit is located in the eastern part ofChin Hang metallogenic belt, Pingxiang-Qiantang depression belt, Wannian upliftbelt, northeastern Jiangxi deep faults on the disk, into the Yangtze plate andCathaysian plate splicing site, is an important magmatic belt in East China, rich inminerals, is distributed with a plurality of large metal deposits at in our country, butalso an important metallic mineral origin.The Dexing porphyry copper deposit,Dahutang tungsten and other large deposits are distributed in this area.Papers by field investigation, laboratory tests samples, combined withcomprehensive data mining research area focuses on the copper ore constituentsYinshan polymetallic deposit, fabric and its relationship with mineralization process.Experimental Test of the rock, ore type, the contact zone, rock samples, grindingflakes, rays, inclusions important piece of ore. Through a lot, under the microscopesystem, mineral identification and advanced analytical tools combined (scanningelectron microscopy, X fluorescence spectroscopy) combined features of Yinshan oremine, diagenetic times, special mineral-depth study. Rocks collected a large numberof chemical and isotopic data deposit, applying the data to complete the Yinshandeposit diagenetic tectonic setting analysis, mineral sources and research into themineralization process.Where the exposed strata are mainly the Middle Proterozoic Shuangqiaoshan group inparagraph fourth(Pt3sh) phyllite, Upper Jurassic ehuling formation(J3e) volcano clastic rock,the lower Cretaceous Shixi formation(K1s) siltstone. Shuangqiaoshan group phyllite is the mainore bearing strata, Rock Creek formation in southern area of only a small part of the exposed.Acid intrusive rock ore rock as early Yanshanian magmatism formed. Magma fromacidic to neutral nature of reverse evolution, the formation of quartz porphyry-daciteporphyry-andesitic porphyry rock assemblages, where the causes of dacite porphyry depositsin the second period and the formation of magmatic intrusions most closely, is the principalcomponent mine period. Rock SiO2content of57.18%-66.38%concentrated, and K2O+ Na2O concentrated between3.73-7.16, quartz porphyry and dacite porphyry with K2O> Na2Ofeatures andesitic porphyry Na2O and K2O have roughly the same genus K calc-alkaline-shoshonitic series rocks, K2O enrichment obvious. Yinshan rock relatively light rare earthenriched HREE loss, LREE separation significantly, REE content δEu of0.83-1.22, indicatingpositive anomaly, reflecting the mantle magma source and sialic material contamination.Deposit with a clear zonation of mineralization, with nine districts3#daciteporphyry and Nishiyama1#brecciated dacitic lava body as the center, the ore bodywas nearly east-west distribution, on the plane, which with copper, sulfur, gold belt,packed as lead, zinc, silver belt;previous sections, the upper part of the transition oflead, zinc, silver belt, deep copper, sulfur, gold belt, gold and copper sulphidemineralization of space close. The main ore deposit types can be divided into pyritestone, copper sulfide ore, lead-zinc-lead-zinc ore and copper sulfide ores. The mainore minerals are pyrite,chalcopyrite, enargite, tennantite, galena, sphalerite, theamount of covellite, chalcocite, bornite, sphalerite, galena, rutile, ilmenite, anatase,wolframite, jamesonite, boulangerite, sulfur and antimony lead silver, bismuthinite,bismuth telluride ore, wolframite, etc.;crystalline granular structure of the main orestructure (grain size from fine to coarse), account structure, colloidal structures, sub-culture like structure, the structure of the solid solution separation grid-like structure,crush structure; mainly constructed with massive structure, followed by constructionand veinlet stockwork disseminated structure, brecciated structure, banded structureand twisted structure and so on.Yinshan polymetallic deposit is porphyry copper type deposits and subvolcanichydrothermal activity related to the early Yanshanian metallogenic epoch, its causesare closely related to the Yanshan felsic magmatism. Sericite40Ar-39Ar age of175-180Ma. Quartz veins containing ore body features wrapped in a display, themain mineralization deposit mineralization temperature132.8℃~304.1℃, mainlyconcentrated in about120℃~150℃and210℃. The average temperature of204.47℃, genus-low temperature conditions; mineralization pressure120.88×105Pa~214.71×105Pa, is a low-light environment; intron crystal inclusions salinityof42.25%~48.5%, a high salinity fluids. The fluid inclusions characteristics of thedeposit, the mineralization of the mineral build order and divided into sub-volcanichydrothermal mineralization period, weathered supergene mineralization of both ofwhich sub-volcanic hydrothermal mineralization further divided into Pyritizationstage, copper-gold and lead-zinc-silver stage stage. |
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