摘要
会泽铅锌矿床位于川滇黔成矿区的滇东北铅锌多金属成矿带,近年来找矿取得重要突破,但其成矿物质来源还存在较大争议。在野外实地调研基础上,通过白云石的C-O和闪锌矿的S同位素分析,为认识该矿床成因提供新的地球化学信息。研究结果显示,热液白云石的δ^(13)C范围为-0.30‰~4.00‰,δ^(18)O的范围为16.64‰~19.71‰;白云岩围岩中白云石的δ^(13)C范围为-0.56‰~4.08‰,δ^(18)O的范围为16.52‰~21.70‰。由于两者的数据点在δ^(13)C_(PDB)-δ^(18)O_(SMOW)组成图解中均落在了海相碳酸盐区域以及海相碳酸盐与地幔之间的区域,指示了会泽矿床的矿化主要是受地幔岩浆和海相碳酸盐岩双重作用的影响。闪锌矿的δ^(34)S值范围为12.7‰~19.1‰,集中分布于14.0‰~17.0‰,与同期海水硫酸盐接近,推测其硫源主要来自于海水。
The Huize lead-zinc deposit has achieved significant breakthroughs in exploration in recent years,but the source of its ore-forming materials remains highly controversial.This study provides new geochemical information for understanding the genesis of this deposit through isotopic analysis of dolomite(C-O)and sphalerite(S).To provide new geochenical information for understanding this deposit.Research results show that the hydrothermal dolomites haveδ^(13)C values ranging from-0.30‰~4.00‰andδ^(18)O values from 16.64‰~19.71‰,while the dolomites from the dolostone country rocks exhibitδ^(13)C values between-0.56‰~4.08‰andδ^(18)O values between 16.52‰~21.70‰.Since the data points from both types fall within the field of marine carbonate and the area between marine carbonate and mantle on theδ^(13)C_(PDB) vs.δ^(18)O_(SMOW) composition diagram,they indicate that the mineralization of the Huize deposit was primarily influenced by the combined effects of mantle-derived magmas and marine carbonate rocks.Theδ^(34)S values of sphalerite range from 12.7‰to 19.1‰,with a concentrated distribution between 14.0‰and 17.0‰.These values are close to those of contemporaneous seawater sulfate,suggesting that the sulfur was primarily derived from seawater.
作者
罗江华
王党靠
李小明
刘吉金
李炼然
LUO Jianghua;WANG Dangkao;LI Xiaoming;LIU Jijin;LI Lianran(Yunnan Chihong Zn&Ge Co.,Ltd.,Qujing,Yunnan 655000,China)
出处
《云南冶金》
2025年第5期10-15,共6页
Yunnan Metallurgy
