摘要
大平掌矿区位于滇西南澜沧江火山岩带中南段的南部,夹持于NNW向区域性李子箐断裂(F4)和酒房断裂(F1)。是典型的与中酸性火山岩有关的VHMS型矿床。通过对硫、铅、氢氧同位素地球化学特征研究,探讨了成矿流体来源及演化。同位素(S、Pb、H、O)研究结果显示:硫同位素δ34S(-2.4‰～2.7‰,平均值为-0.4‰),铅同位素组成(206Pb/204Pb≈18.195—18.942;207Pb/204Pb≈15.408—15.641;208Pb/204Pb≈37.599—38.659),δD值介于-78‰—-59‰,石英矿物的δ18O≈7.2‰—11‰,石英中的水δ18OH2O≈-3‰—0.35‰,研究结果表明:硫主要来源于火山喷气作用,海水硫酸盐对成矿作用的贡献很小;铅同位素组成具有壳-幔混合源铅的特点,深源物质参与成矿明显;成矿热液流体应是深循环海水与岩浆水的混合流体。
The Dapingzhang Deposit is located on the southern of the lancang river volcanic rock belt of central and southern,holding in NNW to regional Lizhiqing fault（F4） and Jiufang fault（F1）,which is typical with VHMS deposits related to intermediate-acidic volcanic.Based on sulfur,lead,hydrogen and oxygen isotope geochemical characteristics was analysised ore-forming fluid source and evolution.Isotope（S、Pb、H、O） studied show thatδ34S =-2.4‰—2.7‰,averaged-0.4‰,peak values being-1.5‰—0.5‰.Lead isotopes of 206Pb /204Pb,207Pb /204 Pb and 208Pb /204Pb vary from 18.195 to18.942,From 15.408 to15.641 and from 37.599 to 38.659.Quartz mineral δD vary from-78‰ to-59‰,δ18O from 7.2‰to 11‰ 18OH 2O from-3‰ to 0.35‰.Implying that the oreforming fluid was mainly derived from volcanic blowing,seawater sulfate to mineralization contribution is poor.Lead isotopic composition has characteristics what the crust-mantle mixed source lead,deep source material is participate in metallogenic obvious.And metallogenic hydrothermal fluid should be the mixed fluid of deep circulating seawater and magmatic water.
出处
《科学技术与工程》
北大核心
2013年第18期5265-5271,共7页
Science Technology and Engineering
基金
云南铜业(集团)有限公司重点科技计划项目(20100101)资助
关键词
硫同位素
铅同位素
氢氧同位素
地球化学
铜多金属矿床
sulfur isotope lead isotope hydrogen and oxyen isotope geochemistry Cu polymetallic deposits
