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    孙兴国, 冯道永, 粟登逵, 王思德, 侯俊富, 印贤波, 袁华山, 江少卿. 西藏班公湖带铁格隆南超大型斑岩铜(金)矿床的勘查突破及区域找矿意义[J]. 中国地质, 2014, 41(4): 1314-1327.
    引用本文: 孙兴国, 冯道永, 粟登逵, 王思德, 侯俊富, 印贤波, 袁华山, 江少卿. 西藏班公湖带铁格隆南超大型斑岩铜(金)矿床的勘查突破及区域找矿意义[J]. 中国地质, 2014, 41(4): 1314-1327.
    SUN Xing-guo, FENG Dao-yong, SU Deng-kui, WANG Si-de, HOU Jun-fu, YIN Xian-bo, YUAN Hua-shan, JIANG Shao-qing. The exploration breakthrough of the Tiegelongnan superlarge porphyry Cu(Au)deposit, Bangong Lake arc, Tibet, and its significance[J]. GEOLOGY IN CHINA, 2014, 41(4): 1314-1327.
    Citation: SUN Xing-guo, FENG Dao-yong, SU Deng-kui, WANG Si-de, HOU Jun-fu, YIN Xian-bo, YUAN Hua-shan, JIANG Shao-qing. The exploration breakthrough of the Tiegelongnan superlarge porphyry Cu(Au)deposit, Bangong Lake arc, Tibet, and its significance[J]. GEOLOGY IN CHINA, 2014, 41(4): 1314-1327.

    西藏班公湖带铁格隆南超大型斑岩铜(金)矿床的勘查突破及区域找矿意义

    The exploration breakthrough of the Tiegelongnan superlarge porphyry Cu(Au)deposit, Bangong Lake arc, Tibet, and its significance

    • 摘要: 提要:在详细分析区域成矿地质背景、区域成矿地质条件的基础上,笔者认为班公湖西段的多龙矿集区还有较大的斑岩Cu-Au矿床成矿前景和资源潜力。通过2013年一年的勘查工作,率先在铁格隆南取得突破,获得的铜资源量达到超大型矿床规模,使其一跃为多龙矿集区规模最大斑岩铜(金)矿床,成为2013年全国重大勘查突破之一。该矿床位于多龙矿集区中部早白垩世美日切错组火山岩分布区,成矿与早白垩世以浅成相侵入的花岗闪长斑岩、花岗斑岩及其相伴产生的热液角砾岩有密切时空关系。矿体主要产于下中侏罗统色哇组长石石英砂岩、岩屑砂岩夹深灰色至深黑色粉砂质板岩和成矿斑岩体中。矿体呈隐伏穹隆状,延深巨大,铜矿化呈网脉状、细脉状和浸染状,热液蚀变发育、分带明显,以硅化强烈、绢云母化以及广泛叠加的高级泥化蚀变为显著特征。矿区剥蚀程度甚低,地表只局部出现褐铁矿化和粘土化,但未见铜矿化,向深部蚀变矿化逐渐增强,矿化延深达千米未封闭。铜矿化上部表现为以辉铜矿-蓝辉铜矿-硫砷铜矿为特征的Cu-S体系,向下转变以斑铜矿-黄铜矿为特征的为Cu-Fe-S体系,铜矿化伴生Au、Ag矿化,并呈正相关关系,与多龙矿集区内其他斑岩Cu-Au矿床相比贫金。该矿床的勘查突破,为矿业公司勘查选区提供了范例,对区域找矿勘查具有重要意义。

       

      Abstract: Abstract: Based on detailed analysis of regional metallogenic geological background and conditions, it is held that the Duolong ore district of the West Bangong Lake arc has metallogenic prospecting and resources potential for porphyry Cu-Au deposits. Through the exploration in 2013, the authors made a breakthrough in Tiegelongnan. Copper reserves of the Tiegelongnan ore district has reached a superlarge ore deposit, and this deposit has thus become the largest porphyry Cu(Au) ore deposit in the Duolong ore district as well as the major exploration breakthrough in 2013. The deposit is located in early Cretaceous Meiriqiecuo formation of the middle Duolong ore district, and has a close temporal relationship with early Cretaceous intrusive granodiorite porphyry, granite porphyry and concomitant hydrothermal mineralization breccia. The orebodies mainly occur in the lower middle Jurassic Sewa Formation feldspar quartz sandstone, lithic sandstone intercalated with dark gray to deep black silty slate and mineralized porphyry. Orebodies exhibit concealed dome and are characterized by great downward extension in the forms of network veins, veinlets, and disseminations. Hydrothermal alteration is well developed, with obvious zonation, strong silicification, sericitization, and widely superimposed advanced argillic alteration. The denudation degree of the ore district is very low. The surface only develops limonite and clay, with no copper mineralization. Alteration and mineralization increased gradually downward, and the mineralization extension reaches one thousand kilometers at depth without closure. The upper copper mineralization is of chalcocite-digenite-enargite association, exhibiting characteristics of the Cu-S system, which gradually changes into bornite and chalcopyrite characteristics of the Cu-Fe-S system. Copper mineralization is associated with Au, Ag mineralization and assumes positive correlation. Compared with other porphyry Cu-Au ore deposits in the Duolong ore district, this deposits is poor in gold. The exploration breakthrough of the deposit provides a good example for the exploration work of the mining company and also has significance for regional ore-prospecting.

       

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