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东天山白石渡银矿床的发现及其地球化学特征

  • 贺昕宇|方同辉|胡龙华|李斯|张驰|薄贺天|陈筱艳|王宏伟|付昱|刘铁成|肖文进|马欢
  • 作者单位:
  • 中国地质调查局花岗岩成岩成矿地质研究中心&防灾科技学院地球科学学院&河北省地震动力学重点实验室&有色金属矿产地质调查中心|有色金属矿产地质调查中心&中色紫金地质勘查(北京)有限责任公司|有色金属矿产地质调查中心|有色金属矿产地质调查中心|河南省地质研究院|河南省第五地质大队有限公司|河南省地质研究院|中国地质调查局花岗岩成岩成矿地质研究中心&防灾科技学院地球科学学院&河北省地震动力学重点实验室&有色金属矿产地质调查中心|有色金属矿产地质调查中心|有色金属矿产地质调查中心|有色金属矿产地质调查中心|防灾科技学院地球科学学院&河北省地震动力学重点实验室
  • 基金项目:

  • 中国地质调查局花岗岩成岩成矿地质研究中心开放基金(PM202306);河北省地震动力学重点实验室开放基金(FZ246101);中国地质调查局项目(DD20160011);河南省地质研究院地质科技攻关项目(2024-906-XM08)
  • 详细信息:

  • 作者简介:
  • 贺昕宇(1989—),男,高级工程师,博士,研究方向为花岗岩与成矿作用;E-mail:xinyuhe2@hotmail.com
  • 通讯作者:
  • 张驰(1982—),男,高级工程师,从事地质勘查工作;E-mail:xianxin5599@163.com
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Discovery and geochemical characteristics of Baishidu Silver Deposit in East Tianshan

  • English Author:
  • Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey&School of Geoscience,China Institute of Disaster Prevention&Hebei Key Laboratory of Earthquake Dynamics&China Non-ferrous Metals Resource Geological Survey|China Non-ferrous Metals Resource Geological Survey&Sino-Zijin Resources Co.,Ltd.|China Non-ferrous Metals Resource Geological Survey|China Non-ferrous Metals Resource Geological Survey|Henan Academy of Geology|Henan Fifth Geological Brigade Limited Company|Henan Academy of Geology|Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey&School of Geoscience,China Institute of Disaster Prevention&Hebei Key Laboratory of Earthquake Dynamics&China Non-ferrous Metals Resource Geological Survey|China Non-ferrous Metals Resource Geological Survey|China Non-ferrous Metals Resource Geological Survey|China Non-ferrous Metals Resource Geological Survey|School of Geoscience,China Institute of Disaster Prevention
  • Unit:
  • 摘要
  • 在线预览
  • 参考文献

摘要:

东天山是中国重要的矿产资源基地,但以银作为主矿种的矿床报道较少。白石渡银矿床是东天山首次报道的热液脉型银矿床,也是该地区发现的独立银矿床。该矿床主要赋矿围岩为晚石炭世—早二叠世肉红色斑状二长花岗岩及灰绿色闪长质岩脉,主矿体呈透镜状,走向北东,长约250 m,Ag品位48.5×10-6~60.3×10-6,Pb品位5.24  %~9.90  %。矿床中方铅矿δ34S值为3.8 ‰~6.3 ‰,平均值为5.01 ‰。石英δ18O值为-8.3 ‰~-5.0 ‰,平均值为-6.30 ‰。研究表明,白石渡银矿床为热液脉型银矿床,不同于该区其他沉积改造型(或层控热液型)银矿床。该矿床成矿流体为岩浆水与大气降水混合,成矿物质为壳幔混源。在该矿床的底部或附近,具有属于同一成矿系统的斑岩型钼矿床的找矿潜力。

关键词:

矿床地球化学;白石渡;硫同位素;氧同位素;热液脉型银矿床;东天山;斑岩型

Abstract:

East Tianshan is a crucial mineral resource base in China,yet silver-dominant deposits are rarely reported.Baishidu Silver Deposit,the first hydrothermal-vein type silver deposit reported in this region,is also the first independent silver deposit discovered.The host rocks are predominantly Late Carboniferous to Early Permian reddish porphyritic monzogranite and greyish-green dioritic dikes.The primary ore body is lens-shaped,trending northeast and extending about 250 m,with silver grades of 48.5×10-6 to 60.3×10-6 and lead grades of 5.24 % to 9.90 %.The δ34S values of galena range from 3.8 ‰ to 6.3 ‰,averaging 5.01 ‰,while quartz δ18O values vary between -8.3 ‰ and -5.0 ‰,averaging -6.30 ‰.The study suggests that Baishidu Silver Deposit is a hydrothermal-vein type,distinct from other sedimentary-transformed or stratabound hydrothermal silver deposits in the region.Mineralizing fluids are a mix of magmatic water and meteoric water,with the mineralizing materials deriving from both crustal and mantle sources.There is potential for discovering porphyry-type molybdenum deposits related to the same mineralization system near the base of this deposit.

Keywords:

deposit geochemistry;Baishidu;sulfur isotopes;oxygen isotopes;hydrothermal-vein silver deposit;East Tianshan;porphyry type