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
投稿时间:2024-01-29  修订日期:2024-03-07  点此下载全文
引用本文:
DOI:
摘要点击次数: 178
全文下载次数: 0
作者单位邮编
任竑宇 昆明理工大学 650031
李超 国家地质实验测试中心 
江小均* 昆明理工大学 
杨富成 昆明理工大学 
韩嶂 昆明理工大学 
芦磊 云南锡业股份有限公司 
陈耀坤 云南锡业股份有限公司 
中文摘要:个旧锡矿集区发育与晚白垩世髙分异花岗岩有关的世界级Sn-Cu多金属矿床,其成矿物质的来源及流体演化过程一直是研究的热点和难点。个旧地区电气石广泛发育于碳酸盐岩、花岗岩及矽卡岩中,但对电气石尚未进行系统研究,电气石与成矿之间的关系尚未明确。本文对不同类型电气石开展了系统的岩相学观察和电子探针(EPMA)、LA-ICP-MS微量元素和硼同位素分析。结果表明,所有电气石都属于碱性电气石,TurⅠ、TurⅡ、TurⅣ为热液成因,TurⅢ为岩浆成因。岩浆电气石相比于热液电气石具有更低的Mg、Ca等元素,TurⅠ电气石高含量的Sr表明受到了围岩的混染。电气石的微量元素变化表明,从似斑状花岗岩到等粒花岗岩,随着岩浆分异程度逐渐增加,Sn在岩浆中逐渐富集,在似斑状花岗岩和接触带矽卡岩中沉淀卸载。个旧不同类型电气石具有均一的δ11B值(?15.2‰~?12.8‰),与花岗岩的组成范围一致,表明成矿物质来源均来源于花岗质岩浆。
中文关键词:电气石  硼同位素  岩浆-热液型锡多金属矿床  个旧锡矿矿集区
 
Geochemical composition and boron isotope characteristics of tourmalines in the Gejiu tin polymetallic mining area of the Yunnan Province: Constraints on the properties and evolution of ore-forming fluids
Abstract:Gejiu tin deposit is a world-class Sn-Cu polymetallic deposit related to the high differentiation granite in the Late Cretaceous, and its mineral origin and fluid evolution process have always been the focus and difficulty of research. Tourmaline is widely developed in carbonate rock, granite and skarn in Gejiu area, but the relationship between tourmaline and mineralization is not clear. In this paper, systematic petrographic observation and electron probe (EPMA), LA-ICP-MS analysis of trace elements and boron isotopes of different types of tourmaline have been carried out. The results show that all tourmalines belong to basic tourmaline, TurⅠ, TurⅡ, TurⅣ are of hydrothermal origin, TurⅢ are 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 is contaminated by surrounding rock. The variation of trace elements in the turmaline shows that Sn is gradually enriched in the magma and precipitated in the porphyritic granite and contact skarn with the increasing degree of magmatic differentiation from porphyritic granite to equite-grained granite. The different types of tourmalines have uniform δ11B values (?15.2‰~?12.8‰), which are consistent with the composition range of granite, indicating that the ore-forming materials all come from granitic magma.
keywords:Tourmaline  B isotopes  Fluid properties  Magma hydrothermal tin polymetallic deposits  Gejiu Tin Mine Cluster Area  
  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国自然资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:北京勤云科技发展有限公司
京ICP备05029128号-6

京公网安备 11010202007616号