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四川大水沟碲矿床是世界唯一的独立碲矿床,楚碲铋矿是该矿床中重要的碲矿物之一。它存在于辉碲铋矿和磁黄铁矿晶粒之间,或包裹在辉碲铋矿中。呈银灰色,金属光泽,一组底面解理发育。显微压入硬度为80.5kg/mm2(15g负荷)。反光显微镜下为白色,非均质性清楚,反射率为58.0~59.9(λ=546nm)。X射线粉晶衍射分析的主要谱线有:4.797(60),3.229(100),2.368(80),2.169(50)。矿物的化学组成据11个电子探针分析的平均值为(重量%);Fe0.13,S0.04,Cu0.03,Te37.84,Bi61.37,Se0.01,Sb0.16;总量99.58,其化学成分式为;BiTe。楚碲铋矿形成于贫硫环境中。 相似文献
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楚碲铋矿、赫磅铋矿是两种光见矿物,其化学成分特征是亏Bi而富S,An,Cu等杂质,它们呈细小的(0.05-0.15mm)的嵌晶被包裹在黄铁矿晶体中,在黄铁矿(单矿物)中含量最高可达2300ug/g,使其具有重要的综合利用价值。它们的生成是由于两种不同性质的初始热液在运移途中相偶,引起磅元素迅速淀积的结果,其化学成分特征反映出S,Au,Cu等都是该区可利用的重要有益组分,因此具找矿意义。 相似文献
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四川大水独立碲矿床中的楚碲铋矿 总被引:2,自引:0,他引:2
四川大水沟碲矿床是世界唯一的独立碲矿床,楚碲铋矿是该矿床中重要的碲矿物之一。它存在于辉碲铋矿和磁黄铁矿晶粒之间,或包裹在辉碲铋矿中,呈银灰色,金属光泽,一组底面解理发育。显微压入硬度80.5kg/mm^2。反光显微镜下为白色,非均质性清楚,反射率为58.0-59.0,X射线衍晶衍射分析的主要谱线有:4.797,3.229,2.368,2.169。矿物的化学组成据11个电子探针分析的平均值为:Fe0 相似文献
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银剑钊 《矿物岩石地球化学通报》1996,(4)
辉碲铋矿矿物学数据补充资料银剑钊(地质矿产部矿床地质研究所,北京100037)关键词辉碲铋矿,热电系数,四川四川石棉县大水沟碲矿床为世界首例独立碲矿床,作者已对其产出的辉碲铋矿化学成分和X射线衍射数据作过报道[1]。本文仅就辉碲铋矿的反射率、显微压入... 相似文献
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大水沟碲矿床流体包裹体的He、Ar同位素组成及其示踪成矿流体的来源 总被引:29,自引:1,他引:29
大水沟碲矿床作为一种新矿床类型 ,自发现以来 ,已进行了大量的研究 ,但对其成矿过程和成矿物质来源仍有不同的认识。本次工作选取磁黄铁矿黄铁矿阶段中的 3件磁黄铁矿和辉碲铋矿阶段的 3件辉碲铋矿和 6件白云母进行成矿流体He、Ar同位素测试 ,获得3He/ 4 He比值为 0 .2~ 2 .8R/Ra ,其中磁黄铁矿的比值在 1.6~ 2 .8R/Ra之间 ,平均 2 .1R/Ra ;辉碲铋矿1.2~ 1.5R/Ra ,平均 1.3R/Ra ;白云母为 0 .2~ 2 .2R/Ra ,平均 1.1R/Ra。成矿流体的40 Ar/ 4 He比值变化较大 ,磁黄铁矿黄铁矿阶段的磁黄铁矿为 2 37~ 379,辉碲铋矿阶段的辉碲铋矿为 7~ 66。这些数据表明大水沟碲矿床在成矿过程中有大量地幔物质参与。 相似文献
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Dashuigou Tellurium Deposit in Sichuan Province, China: S, C, O, and H Isotope Data and Their Implications on Hydrothermal Mineralization 总被引:6,自引:0,他引:6
Jingwen MAO Yitian WANG Tiping DING Yuchuan CHEN Jiaxiu WEI Jianzhao YIN 《Resource Geology》2002,52(1):15-23
Abstract: Dashuigou, a unique tellurium‐dominated deposit over the world, is located in the western margin of the Yangtze cra‐ton in southwestern China. It is characterized by high‐grade tellurium accompanied by bismuth, gold, silver, and sulfur, and occurs in the area of less than one km2. The mineralization is divided into three stages, i.e. (1) tellurium‐bearing pyrrhotite–pyrite stage, (2) tetradymite stage, and (3) auriferous quartz veins stage. Tellurium mineralization coexisting with bismuth, silver, selenium, and gold predominantly develops in the stage 2, while the stage 1 is enriched only in sulfur and iron, and the stage 3 is very weakly mineralized with gold. The δ34S values of sulfides in the ore of the deposit vary in a narrow range of –3.1 ‐ +2.8 per mil with –3.1 ‐ +2.8 per mil for the stage 1 and –0.5 ‐ +2.1 for the stage 2, showing the isotopic characteristics of mantle derived sulfur. The δ13C values of vein dolomites vary from –5.3 to –7.2 per mil, with –5.3 ‐ –6.6 per mil for the stage 1 and –5.3 ‐ –7.2 per mil for the stage 2, which are significantly different from those of surrounding Triassic marble with δ13C values of –0.3 ‐ +2.8 per mil, and show characteristics of mantle derived carbon. The δ18O values of vein dolomites range from +10.2 to +13.1 per mil, which are higher than those of carbonatite, but lower than those of the marble. Their corresponding δ18Owater values are +0.6 ‐ +3.9 per mil, with +2.7 ‐ +3.8 per mil for the stage 1 and +0.6 ‐ +3.9 per mil for the stage 2. The data implies that these vein carbonates were formed by the mixing fluids of magmatic or mantle source with meteoric or formation water. The δ18O values of ore‐forming fluids responsible for the formation of vein quartz are estimated to be +3.2 to +6.8, the δD values of inclusion fluids of the quartz are measured to be –54 to –82 per mil. All those stable isotopic data suggest the involvement of the fluids from mantle and/or mantle‐derived magmas through fault system in the forming process of the Dashuigou tellurium deposit. 相似文献
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四川省石棉县大水沟碲矿床地质,矿物学和地球化学 总被引:3,自引:0,他引:3
位于杨子地台西缘的大水沟碲矿床是世界迄今唯一一例独立碲矿床。成矿围岩为一层30一50m厚的三叠纪变基性火山岩及厚层状大理岩。矿体呈脉状平行排列,走向NNE。成矿作用可以分为磁黄铁矿黄铁矿阶段、辉碲铋矿阶段和黄铜矿黄铁矿(自然金)阶段,其中第二阶段是主要碲矿化阶段。该阶段矿石的碲品位一般为0.2%一5%,富矿石达15%一25%。在矿脉两侧围岩蚀变十分发育,于磁黄铁矿黄铁矿阶段矿脉和辉碲铋矿阶段矿脉两侧分别形成以黑云母为主和以白云母为主的两套蚀变组合及分带。岩石地球化学研究表明,从矿脉边侧向外,K、Na和Ca组分降低,Fe和Mg组分增高。矿脉中白云母的K-Ar年龄测定为149.86±2.72Ma。黄铁矿的Co/Ni比值为56一652。成因矿物学和地球化学特征反映出大水沟碲矿床的成矿物质来自深源,其成矿作用可能与区域上燕山期碱性岩浆或碱质花岗岩活动有关。成矿时磁黄铁矿黄铁矿阶段的硫逸度(fs_2)为10 ̄(-16.7),碲逸度(fTe_2)为10 ̄(-15)一10 ̄(-14);辉碲铋矿阶段的fs_210 ̄(-14)一10 ̄(-11.5)和fTe_210 ̄(-11.2)一10 ̄(-10.5)。 相似文献
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《International Geology Review》2012,54(6):526-546
The Dashuigou tellurium deposit, located on the western margin of the Yangtze platform, is unique. The deposit is hosted by Triassic metabasalt 50 to 80 meters thick. The orebodies occur as a group of NNE-striking parallel veins. Mineralization developed in three stages: Stage I— pyrrhotite-pyrite, Stage II—tetradymite, and Stage III—chalcopyrite-pyrite. Stage II is the principal tellurium mineralization stage and the tellurium-bearing minerals are mainly tetradymite, tsumoite, tellurbismuth, joseite, calaverite, stuetzite, and native tellurium. The general ore grade of the tellurium in Stage II ranges from 0.2 to 5 wt%, and it reaches 15 to 25 wt% for the massive ores. The dominant gangue minerals are calcite and dolomite, with minor biotite, muscovite, albite, quartz, and chlorite. Fluid-inclusion studies of calcite, dolomite, and quartz from Stages I, II, and III yield homogenization temperatures of 356° to 260° C (mean = 320° C), 295° to 198° C (mean = 240°), and 235° to 152° C (mean = 170° C), respectively. Salinities of primary fluid inclusions in all three stages are 1.5 to 5.8 wt% NaCl equivalent, 9 to 15.2 wt% NaCl equivalent, and 2.8 to 3.0 wt% NaCl equivalent, respectively. Isotopic studies show that δ34 values of sulfides range from -2.2 to +2.8 per mil. δ13C values of calcites and dolomites in the ore veins range from -5.3 to -7.42 per mil, and δ18O values range from +10.9 to +13.1 per mil, which are quite different from the δ13C values of+1.0 to +2.8 per mil and δ18O values of +16.8 to +28.5 per mil for the calcites from the Triassic carbonates in the deposit. The δD and δ18O values of muscovite and quartz were measured to be -61 to -54 per mil and +9.9 to +13.0 per mil, respectively. Values of δ18Owater computed from fluid-inclusion trapping temperatures are +3.9 and +7 per mil. A date of 93 Ma was obtained through measurement of muscovite from the No. 12 ore vein. Sulfur-, oxygen-, carbon-, and hydrogenisotope data indicate that the ore-forming substances of the Dashuigou tellurium deposit were derived from deep-seated sources, and the mineralizations probably are associated with Late Mesozoic alkaline or alkaline granitic magmatism. The estimated sulfur fugacities (fs2) are 10?16.7 for Stage I and 10?14 to 1015.5 for Stage II, whereas the tellurium fugacities (fTe2) are 10?15 to 10?14 and 10?11.2 to 10?10.5, respectively. 相似文献