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《Acta Petrologica Sinica》 2012-10
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Element geochemistry zoning of Tongshan copper deposit in Chizhou,Anhui Province,and its implications

ZHANG ZhiYu1,DU YangSong1,PANG ZhenShan2,ZHANG Jing1 and TENG ChuanYao1 1.State Key Laboratory of Geological Process and Mineral Resources,School of the Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China 2.Development Research Center,China Geological Survey,Beijing 100037,China  
The Tongshan copper deposit is a medium-sized skarn deposit,which is located in the Anqing-Guichi ore concentration area along the Middle and Lower Yangtze River metallogenic belt.Ore bodies occur in the contact zone between the Tongshan intrusion and carbonate of the Qixia Formation of the Lower Permian series.Element analyses of the samples systematically collected along a typical section show zoning with gradual variation in elements from magmatic rocks through skarns to carbonates.Skarns near the intrusion are rich in Si,Fe,Mg,siderophile element Co,chalcophile elements Cu and Ag,while those far from the intrusion are rich in Ca,Mn,Al,Ti,REE,chalcophile elements Pb and Zn.Strongly silicated rock far from the marble zone is enriched in Si,Fe,Li and Co,but strongly depleted in Ca,Sr and REE.This zoning may be explained based on the element remobilization theory.During the formation of skarns,Si,Fe,Mg,Al,Li,REE,LILEs(e.g.,Rb and Cs),siderophile elements(Co and V),chalcophile element Zn,and HFSEs(e.g.,Ta,Zr,Nb,Hf,Ga and Be) carried by magmatic-hydrothermal fluids might be transferred into the marble and enriched in skarns,while Ca in the marble activated and enriched in skarns,with moving out of Sr,K and Pb.Weakly altered and mineralized skarn is enriched in REE(ΣREE=122.0×10-6),especially LREE [(La/Sm)N=3.99],but depleted in HREE [(Gd/Yb)N=2.85],with a negative Eu anormaly(δEu=0.69).Chondrite-normalized HREE pattern of skarn is similar to that of fresh quartz-monzonite-porphyry,but it is relative low in LREE(e.g.,La,Ce).The variation of elements along the section and REE pattern of skarns indicate a contact metasomatic origin of the Tongshan skarn copper deposit.The data mentioned above combined with H-O isotopic analyses indicate the derivation of ore-forming fluids is mainly from magmatic hydrothermal solution,with addition of meteoric water into the fluids at the stage of retrogressive alteration and mineralization.
【Fund】: 国家自然科学基金项目(40672045);; 中国地质调查局项目(20089938);; 地质过程与矿产资源国家重点实验室开放课题基金项目(GPMR201101)联合资助
【CateGory Index】: P618.41
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