ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
云南个旧锡多金属矿集区电气石地球化学组成和硼同位素特征——对成矿流体性质和演化的约束
  
关键词:tourmaline  B isotopes  magma hydrothermal tin polymetallic deposits  Gejiu tin mine cluster area
基金项目:云南省科技计划项目(编号: 202202AG050006);云南省科技计划项目高层次科技人才及创新团队选拔专项(编号: 202305AT350004)
作者单位E-mail
任竑宇 昆明理工大学国土资源工程学院地球科学系
自然资源部三江成矿作用及资源勘查利用重点实验室
国家地质实验测试中心 
420177826@qq.com 
李超 国家地质实验测试中心
中国地质调查局Re-Os同位素地球化学重点实验室 
 
江小均 昆明理工大学国土资源工程学院地球科学系
自然资源部三江成矿作用及资源勘查利用重点实验室 
cagsjiang@126.com 
杨富成 昆明理工大学国土资源工程学院地球科学系
自然资源部三江成矿作用及资源勘查利用重点实验室 
 
韩嶂 昆明理工大学国土资源工程学院地球科学系
自然资源部三江成矿作用及资源勘查利用重点实验室 
 
芦磊 昆明理工大学国土资源工程学院地球科学系
云南锡业股份有限公司大屯锡矿 
 
陈耀坤 云南锡业股份有限公司老厂分公司  
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摘要:
Geochemical Composition and Boron Isotope Characteristics of Tourmalines in the Gejiu Tin Polymetallic Mining Area, Yunnan Province: Constraints on the Properties and Evolution of Ore-forming Fluids
      The Gejiu tin deposit is a world-class Sn-Cu polymetallic deposit related to highly differentiated granite in the Late Cretaceous. Its mineral origin and fluid evolution process have always been the focus of research. Tourmaline is widely developed in carbonate rock, granite, and skarn in the Gejiu area; however, the relationship between tourmaline and mineralization is unclear. In this study, systematic petrographic observation and electron Microanalysis (EPMA), and LA-ICP-MS analysis of trace elements and boron isotopes from different types of tourmaline were carried out. The results show that all tourmalines belong to basic tourmaline; TurⅠ, TurⅡ, and TurⅣ are of hydrothermal origin, whereas TurⅢ is of magmatic origin. Compared with hydrothermal tourmaline, magmatic tourmaline has lower Mg, Ca, and other elements and the high Sr content of TurⅠ tourmaline indicates that it was contaminated by the surrounding rock. The variation in trace elements in the tourmaline reveals that Sn was gradually enriched in the magma and precipitated in the porphyritic granite and contact skarn, with an increasing degree of magmatic differentiation from porphyritic granite to equite-grained granite. The different types of tourmalines had uniform δ11B values (?15.2‰ – ?12.8‰), which are consistent with the composition range of granite, indicating that the ore-forming materials were derived from granitic magma.
REN Hongyu,LI Chao,JIANG Xiaojun,YANG Fucheng,HAN Zhang,LU Lei,CHEN Yaokun.2024.Geochemical Composition and Boron Isotope Characteristics of Tourmalines in the Gejiu Tin Polymetallic Mining Area, Yunnan Province: Constraints on the Properties and Evolution of Ore-forming Fluids[J].Acta Geoscientica Sinica,45(4):575-590.
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