地质学报2017，Vol.91Issue(6)：1285-1298,14.
湖南祁东清水塘铅锌矿床成矿物质来源同位素示踪
Isotopic Tracer of Ore-Forming Material Source from the Qingshuitang Lead-Zinc Deposit, Qidong County, Hunan Province
摘要
Abstract
Qingshuitang Pb-Zn deposit,a medium-size deposit,is located in the northeast of Qidong County,Hunan Province.Based on field geological investigation,we carried out the sulfur and lead isotopic compositions of the ores,hydrogen and oxygen isotopic compositions of the ore-bearing quartz,as well as carbon and oxygen isotopic compositions of the ore-bearing calcites and limestone,to discuss the oreforming material source and genesis of the Qingshuitang Pb-Zn deposit.The δ34S values of pyrite,galenite and sphalerite range from-7.41 to 2.91‰,and the δ34S values of barite range from 11.49 to 12.34 ‰,indicating a deep source for magma and may be partly contaminated by the crustal substance.The 206Pb/ 204Pb,207Pb/204Pb and208 Pb/204 Pb ratios for ores range from of 17.810 to 18.710,15.497 to 15.726,37.858 to 38.834,respectively,indicating Pb was mainly derived from crust and may be mixed some mantle source.The δDSMOW and δ18O H2O values of ore-bearing quartz range from-87.4 to-79.3‰ and from 8.10 to 0.63‰,respectively,indicating that the ore-forming fluid came mainly from a magmatic hydrothermal source,with meteoric water added in the late mineralization stage.The δ13 CvPDBvalues for limestone in strata range from 0.9 to 2.6‰,the δ18 OSMOW values range from 21.86 to 23.39 ‰;The δ13CvPDB and the δ18O SMOWvalues of ore-bearing calcites range from-5.3 to-4.6 ‰ and from 12.30 to 13.48‰,respectively,which are not consistent with δ13C PDB(0.9 ‰ ～ 2.6 ‰) and δ18O SMOW(21.86 ‰ ～ 23.39 ‰)of the limestone,indicating that carbon in the ore-forming fluid mainly originated from deep magma.The research above shows that the ore-forming materials of the Qingshuitang deposit mainly came from the partial melting of the crust and the mixing effect was the main ore-forming mechanism.关键词
同位素示踪/成矿物质来源/矿床成因/清水塘铅锌矿床/湖南省祁东县Key words
isotopic tracer/ore-forming material source/genesis of deposits/Qingshuitang Pb-Zn deposit/Qidong County, Hunan Province引用本文复制引用
路睿,缪柏虎,徐兆文,陆建军,王汝成,左昌虎,屈金宝,赵增霞..湖南祁东清水塘铅锌矿床成矿物质来源同位素示踪[J].地质学报,2017,91(6):1285-1298,14.基金项目
本文为国家自然科学基金项目(编号:41173050) （编号:41173050）
中国地质调查局调查项目(编号:1212011085407)联合资助的成果. （编号:1212011085407）
