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夏塞银矿床中硫盐矿物成矿作用的重要意义
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  • 英文篇名:The important significance of mineralization concerning sulfosalt minerals in Xiasai deposit
  • 作者:丁奎首 ; 郭敬辉 ; 刘秉光 ; 韩秀伶 ; 杨赛红
  • 英文作者:DING Kuishou;GUO Jinghui;LIU Binguang;HAN Xiuling;YANG Saihong;Institute of Geology and Geophysics,Chinese Academy of Sciences;
  • 关键词:夏塞超大型银矿床 ; 大陆碰撞成矿 ; 辉锑铅银矿 ; 正交格子网格状构造
  • 英文关键词:Xiasai super-large Ag deposit;;continental collision deposit;;diaphorite;;othorombic lattice texture
  • 中文刊名:DZXE
  • 英文刊名:Acta Geologica Sinica
  • 机构:中国科学院地质与地球物理研究所;
  • 出版日期:2019-01-15
  • 出版单位:地质学报
  • 年:2019
  • 期:v.93
  • 语种:中文;
  • 页:DZXE201901013
  • 页数:12
  • CN:01
  • ISSN:11-1951/P
  • 分类号:222-233
摘要
夏塞银多金属矿床地处我国四川省巴塘县茶洛乡,按照大地构造单元划分其位于川西义敦岛弧造山带的中央地段。它是我国最早发现的大陆碰撞型矿床。该矿床以含高品位的Ag,伴生Sn、Cu、Bi、Cd、Au,以及众多的硫化物及硫盐为特征,其种类多达50种,尤以辉锑铅银矿及银锑黝铜矿系列最丰富,系该矿山银资源的主要矿石矿物。其他如锑端元硫砷锑铅矿、脆硫锑银铅矿、硫锑铅矿-脆硫锑铅矿系列亦有发育。本文旨在查明此类矿物的成因并探索其重要的成矿作用。本文通过EMP及SEM-EDS等方法查明上述矿物的赋存形式并分析其化学组成。结果表明上述矿物均以显微包裹体状态散布于硫化物方铅矿及铁闪锌矿中。代表性的辉锑铅银矿包裹体粒径大小悬殊,形态各异,粒度从1μm至50μm不等,且以两组成90°正交的网状构造分布在方铅矿中,此种构造实属罕见,此外尚见有其他多种奇特形态。将银锑黝铜矿系列的Ag/(Ag+Cu)与Zn/(Zn+Fe)比值在Sack等温曲线中投图,估算生成银锑黝铜矿系列的流体温度为200~350℃。参照以往包裹体测温数据认为夏塞地区Ag、Sn多金属矿床应属岩浆期后的中温热液类型矿床。本文再次强调硫盐矿物在夏塞银矿床成矿作用中的重要性,有助于深刻认识夏塞矿床成因机制。
        The Xiasai Ag polymetallic deposit is located at Chaluo Village,Batang County in Sichuan Province,and belongs to middle range of Yidun island arc orogenic belt in western Sichuan.It is a typical continental collision of Ag-polumetallic deposit that firstly discovered in China.The deposit is featured by high-grade Ag and associated with Sn,Cu,Bi,Cd,Au,with plenty of sulfides and sulfosalt minerals,about 50 species,especially diaphorite and tetrahedrite-Ag series which are the main ore minerals.Moreover,other sulfosalt minerals,such as geocronite-(Sb),owyheetie-(Pb),boulangerite-jamesonite series are also found.This study is focused on genesis of these sulfosalt minerals and figuring out their roles in mineralization.Analysis by EMP and SEM-EDS indicate that these sulfosalt minerals are mostly included in galena or marmatite as inclusions,and chemical composition of them are analyzed.The grain size of diaphorite varies from 1μm to 50μm.It is interesting that diaphorite perform as orthogonal littice texture in galena which is rare found.In addition,other unique occurrences also appear.In order to estimate the temperature of the ore-forming of the deposit,the value of Ag/(Ag+Cu)and Zn/(Zn+Fe)ratios of Agtetrahedrite series are ploted on sack's isothermal curves,thus ore-forming temperature of tetrahedrite-Ag series is assumed 200~350℃.Combining with former data of temperature measured by quartz inclusions,it is considered that the Xiasai deposit should be a post-magmatic mesothermal deposit.Briefly,the importance of metallization of sulfosalt minerals should be noticed.
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