西藏甲玛铜多金属矿床铜山矿体为manto型矿体?*
投稿时间:2017-04-26  修订日期:2017-06-23  点此下载全文
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唐攀 成都理工大学地球科学学院 694114592@qq.com 
唐菊兴 中国地质科学院矿产资源研究所  
郑文宝 中国地质科学院矿产资源研究所  
冷秋锋 西藏华钰矿业股份有限公司  
林彬 中国地质科学院矿产资源研究所  
唐晓倩 中矿联资源储量评审咨询中心  
王豪 成都理工大学地球科学学院  
高昕 成都理工大学地球科学学院  
张泽斌 中国地质大学北京  
周洪兵 四川省煤田地质局一四一队  
中文摘要:manto型矿化是指“沿层交代”并受地层控制,构造控矿,品位高富含硫化物矿石。甲玛铜多金属矿床位于西藏冈底斯成矿带东段,在公益性与商业性勘查结合下,取得重大找矿突破的世界级超大型斑岩-矽卡岩型铜多金属矿床。铜山(南坑)矿体是继揭露甲玛深部斑岩矿体之后的又一找矿重大突破。铜山矿体规模达到大型,铜金属量70多万吨,钼金属量2万吨,铅+锌金属量120多万吨,伴生金金属量20多吨,伴生银金属量2000多吨。铜山矿体距离斑岩体中心1km,受铜山滑覆构造控制,滑覆体内部次级褶皱、裂隙发育,为热液流体运移、沉淀提供了良好的空间;赋存于林布宗组角岩、林布宗组角岩和多底沟组大理岩层间及多底沟组大理岩中,呈透镜体、脉状、囊状、豆荚状;富含硫化物,主要为黄铜矿、闪锌矿、方铅矿、斑铜矿、磁黄铁矿、黄铁矿、辉钼矿等;品位较高,铜平均品位0.99%,铅+锌平均品位2.88%。通过野外地质调查,并与世界上其他manto型矿体对比,甲玛铜山矿体属于斑岩成矿系统远端的manto型富矿体。甲玛manto型矿体的发现和确定在西藏冈底斯成矿带上尚属首例,对该成矿带其他斑岩、矽卡岩矿床寻找外围manto型富矿体具有极其重要的指导意义,其经济意义也十分巨大,目前已经建成日处理4万吨的露天采场。
中文关键词:manto  矽卡岩  斑岩铜成矿系统  甲玛  西藏  冈底斯成矿带
 
Is Tongshan orebody in Jiama copper- polymetallic deposit manto-type ore?
Abstract:Manto- type mineralization is replacement along strata, generally strata bound, obviously structural ore-control, high grade, and sulfide-rich ore. Jiama deposit, super- large porphyry-skarn deposit, is located in the east of Gangdese metallogenic belt, Tibet. It has been the important achievements of the combination of nonprofit with commercial prospecting. Tongshan (south pit) orebody is a prospecting breakthrough after exposing Jiama concealed porphyry orebody. The proven resources of the Tongshan orebody is >0.7 Mt Cu, 0.02Mt Mo, 1.2Mt Pb+Zn, 20t Au, and 2000t Ag. Tongshan orebody are 1km distant from the porphyry center. Tongshan orebody is control by Tongshan gliding nappe tectonic, in which there are many secondary folds and fractures that space for hydrothermal fluid migration and precipitation. Tongshan orebody, hosted in the Linbuzong Formation hornfels, the Duodigou Formation marbles, and the interlayer detachment zone between the Linbuzong Formation hornfels and the Duodigou Formation marbles, is lenses, veined, cystic, and podiform. Tongshan orebody is sulfide-rich that include Chalcopyrite, sphalerite, galena, bornite, magnetic pyrite, pyrite, and molybdenite. The average grade of Cu is 0.99%, and Pb+Zn is 2.88%. These geological findings led the authors to believe that Tongshan orebody are distal manto- type ore of porphyry copper systems through field geological investigation and comparison with other manto-type deposits. This is for the first time a deposit of this significant type was found and verified in Gangdise belt, which is of great guiding significance in prospecting peripheral manto-type ore for the other porphyry, skarn deposits in Gangdise metallogenic belt. It has high economic significance, and at present the south open pit of day processing forty thousand tons has been built.
keywords:manto  skarn  porphyry copper metallogenic systems  Jiama  Tibet Gangdese metallogenic  belt
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