| 西藏多龙尕尔勤——一个遭受过剥蚀的浅成低温热液金矿床 |
| Received:May 21, 2022 Revised:February 12, 2023 点此下载全文 |
| 引用本文：SUN Hao,SONG Yang,LI FaQiao,LI ZiChen,WANG Xu,LI Yang,ZHENG Ming,FANG Ying.2023.Gaerqin deposit in Duolong ore district, Tibet: An epithermal gold deposit that suffered from erosion[J].Mineral Deposits,42(2):287~309 |
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| Author Name | Affiliation | E-mail | | SUN Hao | MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | SONG Yang | MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | songyang100@126.com | | LI FaQiao | School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China | | | LI ZiChen | School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China | | | WANG Xu | School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China | | | LI Yang | MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | ZHENG Ming | MNR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | FANG Ying | School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China | |
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| 基金项目:本文得到国家自然科学基金（编号：42172100）、自然资源部杰出青年人才项目（编号：KY-BR-XZ-202006）和中央级公益性科研院所基本科研业务费专项资金（编号：KK2102）联合资助 |
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| 中文摘要:西藏具有形成巨型斑岩铜成矿系统的地质背景。浅成低温热液型金矿常发育于斑岩铜成矿系统上部，极具经济价值，但由于形成深度较浅，易于剥蚀，目前西藏地区尚未发现独立的浅成低温热液型金矿床。多龙超大型铜金矿集区位于西藏班公湖-怒江成矿带西段，产出有大型-超大型斑岩-浅成低温热液型铜金矿床，而是否存在独立的浅成低温热液型金矿，既是重大科学问题，也是勘查的重点方向。文章运用超景深高分辨数码显微镜、扫描电镜及电子探针等手段，系统研究了多龙矿集区尕尔勤矿区内的残坡积物和外围水系沉积物中746颗砂金的大小、形貌、核部元素及不透明矿物包体特征，发现尕尔勤矿区内广泛分布的砂金不是表生环境下生物化学或化学成因金，而是尕尔勤产出的金矿（化）体剥蚀的产物。砂金普遍含有较高的w（Bi）、极低的w（Cu），部分含有高的w（Hg）、w（Te）；砂金w（Ag）变化较大（0.05%~40.21%）；金成色变化范围较大（588~999）；砂金富含Bi-Pb-Te-S系列矿物包体等，显示尕尔勤矿区可能存在一个遭受过剥蚀的浅成低温热液金矿床。 |
| 中文关键词:地球化学 砂金 金矿 浅成低温热液 多龙 西藏 |
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| Gaerqin deposit in Duolong ore district, Tibet: An epithermal gold deposit that suffered from erosion |
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| Abstract:Tibet has a favorable geological background for forming giant porphyry copper systems. However, compared with porphyry Cu (Au-Mo) deposits, independent epithermal gold deposits with significant economic value developed in the upper part of the porphyry copper system have not been discovered so far in this region, mainly due to the shallower depth to be more susceptible to erosion. The Duolong copper-gold district is located in the western Bangong-Nujiang metallogenic belt, which hosts several large and super-large porphyry-epithermal Cu(Au)deposits. However, whether there are independent epithermal gold deposits in this region is not only a major scientific issue but also a key direction for exploration. In this study, we systematically investigated the size, morphology, core trace elements and opaque mineral inclusions signatures of 746 placer gold grains collected from eluvium and alluvium in the Gaerqin ore area, by using the super-depth-of-field high-resolution digital microscope, the scanning electron microscope and the electron microprobe. The results show that the placer gold grains are not formed by biochemistry or chemical processes in the supergene environment, but are the products of the denudation of the gold ore bodies in the Gaerqin ore area. The characteristics of placer gold grains include generally high Bi, extremely low Cu, and partly high Hg, Te, as well as Ag varying greatly (0.05%~40.21%), a wide range of fineness (588~999), together with abundant Bi-Pb-Te-S opaque mineral inclusions, indicate that an epithermal gold deposit may be developed in the Gaerqin ore area. |
| keywords:geochemistry placer gold gold deposit epithermal Duolong Tibet |
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