| 新疆小热泉子铜(锌)矿床硫化物显微结构及稀土、微量元素研究 |
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| 关键词:copper (zinc) deposit sulfide microstructure trace elements rare earth elements (REE) Xiaorequanzi |
| 基金项目:“十二五”国家科技支撑计划新疆305项目“库鲁克塔格铜金铁成矿带成矿条件研究与找矿靶区评价”(编号: 2011BAB06B04-05) |
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| A Study of Rare Earth and Trace Elements and Microstructure of Sulfide Minerals from the Xiaorequanzi Copper (Zinc) Deposit of Xinjiang |
| The Xiaorequanzi Cu(Zn)deposit of Xinjiang is located in the late Paleozoic island-arc of Danan Lake area, its ore bodies are hosted in a sedimentary rock suite of tuffaceous detritus, and its ore types are mainly massive chalcopyrite, sphalerite and other lodes. Researches on the microstructure of these sulfides suggest that pyrite has undergone brittle deformation, and formed such structures as clastic structure, fining structure, infilling and metasomatic structure, “pudding” structure and porphyroblast structure, while chalcopyrite and sphalerite have undergone flexibble deformation and resulted in the “S”-shaped foliation of chalcopyrite and the porphyritic structure of sphalerite. Electron microprobe analysis indicates that chalcopyrite has experienced the processes of activation, removal and concentration. The concentrations of REE and trace elements demonstrate that Mn, Ga and As in sphalerite have a low REE concentration and the Ga/In ratios are much lower than 1, most Ge/In ratios are also lower than 1, Zn/Cd ratios range from 174 to 482, In/Cd ratios range from 0.1 to 0.35, and pyrites formed in different metallogenic periods have different Co/Ni ratios, S/Se ratios and S/Fe ratios. There is a remarkable difference in the REE distribution pattern between this pyrite and pyrite in granite-porphyry and rhyolite-porphyry. Based on a comparison of microstructures as well as distribution patterns of REE and trace elements between these sulfides, the authors hold that chalcopyrite has a better flowability than sphalerite, and the chalcopyrite tended to become active and move more easily than sphalerite under tense shear strain, and large-scale movement would lead to the concentration of chalcopyrite and finally the formation of the Xinjiang Xiaorequanzi Cu(Zn)deposit. It is thus concluded that the metallogenic fluid was the mixture of several different fluids, and this ore deposit was genetically volcanic sedimentation at the early stage which was then modified by hydrothermal solution at the late stage. |
| LIU Shen-tai,Lü Xin-biao,CAO Xiao-feng,ZHANG Ping.2012.A Study of Rare Earth and Trace Elements and Microstructure of Sulfide Minerals from the Xiaorequanzi Copper (Zinc) Deposit of Xinjiang[J].Acta Geoscientica Sinica,33(2):197-208. |
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