东昆仑那更康切尔银矿床S-Pb-C-O同位素地球化学特征

发布时间：2018-03-01 18:00

  本文关键词： 银矿床 S-Pb-C-O同位素 硫化物 方解石 东昆仑　出处：《矿物学报》2017年06期 　论文类型：期刊论文

【摘要】：那更康切尔银矿床位于东昆仑成矿带中部,紧邻昆中构造带。矿体主要以脉状产出于古元古代金水口群片麻岩以及晚古生代花岗闪长岩和二长花岗岩中。本文在矿床地质特征研究基础上,采集12件样品对其硫化物(黄铁矿、方铅矿、闪锌矿)和方解石分别开展了S-Pb和C-O同位素研究。结果表明,矿床硫同位素组成稳定,δ~(34)S主要集中于-3.4‰~0.6‰之间,主要来源于岩浆作用;硫化物~(206)Pb/~(204)Pb值介于18.28~18.62,平均值为18.37,~(207)Pb/~(204)Pb值介于15.60~15.73,平均值为15.65,~(208)Pb/~(204)Pb值介于38.38~39.10,平均值为38.63,铅同位素组成稳定,矿石铅主要来源于地壳;方解石δ~(13)C值介于-6.0‰~-2.8‰,平均值为-4.25‰,δ~(18)O值介于6.1‰~20.5‰,平均值为12.49‰,表明C可能主要由岩浆作用提供。综合矿床地质特征和区域成矿背景认为该矿床应属于岩浆期后热液矿床,受构造和岩浆作用的双重控制。
[Abstract]:The Nagan Kangchell silver deposit is located in the middle of the East Kunlun metallogenic belt. The orebody mainly occurs in the ancient gold mouth group gneiss of Gu Yuan and in the late Paleozoic granodiorite and monzomorphic granite. Based on the study of geological characteristics of the deposit, the orebody is located in the middle Kun tectonic belt. S-Pb and C-O isotopic studies on sulphide (pyrite, galena, sphalerite) and calcite were carried out in 12 samples. The results show that the sulfur isotopic composition of the deposit is stable, and 未 ~ (34) ~ (34) S is mainly concentrated in the range of -3.4 鈥，

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