德国上哈尔茨山脉劳滕塔尔后瓦利斯纪锌-铅-银矿脉的铟-镓-锑关联:闪锌矿矿物化学

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2024-04-13 DOI:10.1007/s00126-024-01261-8
Torsten Graupner, Sören Henning, Simon Goldmann, Sebastian Fuchs, Klaus Stedingk, Wilfried Liessmann, Sven Birkenfeld
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引用次数: 0

摘要

劳滕塔尔闪锌矿-方铅矿脉矿床是德国古生代瓦里斯坎褶皱带哈尔茨隆起区世界级上哈尔茨铅锌金矿区的一部分。该矿床以闪锌矿为主,采用大块孔化学、电子探针显微分析和激光烧蚀-ICP-质谱法对其矿物关联进行了研究。镓和铟是闪锌矿中主要的高科技相关微量元素,在手工挑选的闪锌矿样品中,镓含量高达 150 ppm,铟含量高达 380 ppm(平均铟/锌,0.70 × 10-3)。矿石精矿(≤ 50 千克)的镓含量高达百万分之 65,铟含量高达百万分之 109(In/Zn 平均值为 0.36 × 10-3)。在早期的石英-硫化物矿石阶段出现了富含铁-铜的格氏闪长岩-1,在晚期的碳酸盐-硫化物阶段出现了富含锑的格氏闪长岩-2。铟的富集模式要么是由早期阶段富铁闪锌矿-1中的叠印纹理确定的,要么与后期阶段贫铁闪锌矿-2中的原生生长分带有关。利用闪锌矿地温计 GGIMFis,估计劳滕塔尔矿体闪锌矿-1 的形成温度(中位数)约为 230 °C,布罗姆贝格矿体的形成温度约为 175 °C,这可能表明早期矿石阶段存在横向 T 型分带。闪锌矿-2 的数据表明其形成温度约为 185 °C(中位数)。碳酸盐-硫化物阶段的含铜盐水假定温度约为 250 °C,这促使黄铜矿取代贫铟闪锌矿-1,并使锌和微量元素重新移动。富铟闪锌矿-2 与方解石和细粒方铅矿伴生。矿石形成在空间或时间上与岩浆热液系统直接相关的可能性不大,这与世界各地的富铟表生矿床和锡多金属矿床形成鲜明对比。
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The In-Ga-Sb association of the post-Variscan Zn-Pb-Ag vein deposit at Lautenthal, Upper Harz Mountains, Germany: sphalerite mineral chemistry

The Lautenthal sphalerite-galena vein deposit is part of the world-class Upper Harz Pb-Zn-Ag district in the Harz uplift block of the Paleozoic Variscan fold belt in Germany. Its sphalerite-dominated mineral association was studied using bulk-ore chemistry, electron probe microanalysis, and laser ablation-ICP-mass spectrometry. Gallium and locally In are the main high-tech-relevant trace elements hosted by sphalerite, with up to 150 ppm Ga and up to 380 ppm In in hand-picked sphalerite samples (mean In/Zn, 0.70 × 10−3). Ore concentrates (≤ 50 kg) contain up to 65 ppm Ga and up to 109 ppm In (mean In/Zn, 0.36 × 10−3). Accessory Fe-Co-rich gersdorffite-1 occurs in the earlier quartz-sulfide ore stage and Sb-rich gersdorffite-2 in the later carbonate-sulfide stage. Enrichment patterns of In are either defined by overprinting textures in the Fe-richer sphalerite-1 of the earlier stage, or relate to primary growth zoning in Fe-poor sphalerite-2 of the later stage. Using the sphalerite geothermometer GGIMFis, formation temperatures (median) of sphalerite-1 were estimated at ~ 230 °C for the Lautenthal orebody and at ~ 175 °C for the Bromberg orebody, which may indicate lateral T-zonation for the earlier ore stage. Sphalerite-2 data indicate formation temperatures of ~ 185 °C (median). Copper-bearing brines of the carbonate-sulfide stage with assumed temperatures of ~ 250 °C initiated replacement of In-poor sphalerite-1 by chalcopyrite and remobilization of Zn and trace elements. Indium-rich sphalerite-2 occurs associated with calcite and fine-grained galena. A direct spatial or temporal link of ore formation to a magmatic-hydrothermal system is unlikely, which contrasts to In-rich epithermal and tin-polymetallic vein deposits worldwide.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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