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翟伟,郑思琦,孙晓明,韦慧晓,莫儒伟,张凌宇,周峰,易建洲. 2018. 藏南喜马拉雅造山带造山型马扎拉Au-Sb矿床和沙拉岗Sb矿床流体包裹体He-Ar同位素组成:对成矿流体来源的制约. 岩石学报, 34(12): 3525-3538
藏南喜马拉雅造山带造山型马扎拉Au-Sb矿床和沙拉岗Sb矿床流体包裹体He-Ar同位素组成:对成矿流体来源的制约
作者单位
翟伟 中山大学海洋科学学院, 广州 510006
广东省海洋资源与近岸工程重点实验室, 广州 510006 
郑思琦 中山大学海洋科学学院, 广州 510006 
孙晓明 中山大学海洋科学学院, 广州 510006
广东省海洋资源与近岸工程重点实验室, 广州 510006
中山大学地球科学与工程学院, 广州 510275 
韦慧晓 中山大学地球科学与工程学院, 广州 510275 
莫儒伟 广东省有色金属地质勘查局地质调查院, 广州 510080 
张凌宇 中山大学海洋科学学院, 广州 510006 
周峰 中山大学地球科学与工程学院, 广州 510275 
易建洲 西藏地质矿产勘查局地质调查院, 拉萨 851400 
基金项目:本文受国家自然科学基金项目(40873034、40830425、41573034)资助.
摘要:
      马扎拉Au-Sb矿床和沙拉岗Sb矿床是藏南金锑成矿带中典型的造山型矿床。马扎拉Au-Sb矿床中矿体以含金辉锑矿石英脉的形式产于下中侏罗统陆热组地层中,主要组成矿物有自然金、辉锑矿、石英和碳酸盐矿物;沙拉岗Sb矿床中矿体主要以辉锑矿石英脉的形式产于下白垩统多久组地层和辉长岩体中,主要组成矿物为辉锑矿、辰砂、锑华、石英和少量碳酸盐矿物。在两个矿床的矿脉石英和辉锑矿中均发现有三类原生和假次生包裹体:水溶液包裹体、CO2-水溶液包裹体和有机包裹体。流体包裹体显微测温结果显示:马扎拉Au-Sb矿床的成矿温度为160~280℃,沙拉岗Sb矿床的成矿温度为140~240℃。He-Ar同位素分析显示马扎拉Au-Sb矿辉锑矿石英脉矿石中辉锑矿和石英以及赋矿地层中沉积层状硫化物中黄铁矿的流体包裹体均具有低的3He/4He比值,分别为0.01382~0.05642Ra和0.03353~0.08744Ra,40Ar/36Ar比值具有比较大的变化范围,分别为346.8~4770.1和349.4~2689.1;沙拉岗Sb矿床中辉锑矿样品的3He/4He比值为0.02385~0.11488Ra,40Ar/36Ar比值变化小,为300.6~537.5。与藏南Au-Sb成矿带中造山型Au矿床成矿流体中含一定量的幔源挥发份相对比,马扎拉Au-Sb矿床和沙拉岗Sb矿床成矿流体中均无幔源流体的参与,马扎拉Au-Sb矿床成矿流体为壳源变质流体与改造型饱和大气水形成的混合流体;沙拉岗Sb矿床成矿流体以改造型饱和大气水为主,并有壳源变质流体的加入。
英文摘要:
      The Mazhala Au-Sb and Shalagang Sb deposits are two typical orogenic deposits in the southern Tibet Au-Sb metallogenic belt in the Himalayan orogeny. At Mazhala, the gold-and stibnite-bearing quartz vein orebodies are hosted in Lower to Middle Jurassic Lure Formation. Minerals comprising the ore are native gold, stibnite, quartz and carbonate. At Shalagang, the host rocks are Lower Cretaceous Duojiu Formation and gabbro body. Orebodies consist mainly of stibnite-bearing quartz veins. Minerals comprising the ore are stibnite, cinnabar, valentinite, quartz and trace amount of carbonate. Three types of primary and/or pseudosecondary fluid inclusions were recognized in quartz and/or stibnite from the ore vein of the both deposits:type Ⅰ aqueous inclusions, type Ⅱ CO2-aqueous inclusions and type Ⅲ hydrocarbon inclusions. The microthermometric results show the mineralization temperatures are from 160℃ to 280℃ for Mazhala, and from 140℃ to 240℃ for Shalagang. Isotopic rations of He and Ar show, at Mazhala, 3He/4He of inclusion fluids in stibnites and quartzs from gold-and stibnite-bearing quartz vein, and pyrites from sedimentary sulfide layer are low, varying from 0.01382Ra to 0.05642Ra and 0.03353Ra to 0.08744Ra, respectively, 40Ar/36Ar varies widely, from 346.8 to 4770.1 and from 349.4 to 2689.1; at Shalagang, 3He/4He of inclusion fluids in stibnites are also low, varying from 0.02385Ra to 0.11488Ra, 40Ar/36Ar varies narrowly, from 300.6 to 537.5. Contrasting with a certain amount of mantle volatile involvement in ore fluid of orogenic gold deposits in the southern Tibet Au-Sb metallogenic belt, there are no occurrence of mantle component in ore-forming fluid of Mazhala Au-Sb and Shalagang Sb deposits. The ore-forming fluid for Mazhala and Shalagang consisted of a mixture of crustal metamorphic fluid and modified air-saturated water, and predominantly modified air-saturated water with involvement of crustal metamorphic fluid, respectively.
关键词:造山型Au-Sb矿床  He-Ar同位素  幔源流体  变质流体  改造型饱和大气水
投稿时间:2018-04-20  修订日期:2018-07-20
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