云南保山金厂河铁铜铅锌多金属矿床S-Pb同位素特征  

S-PB ISOTOPIC CHARACTERISTICS OF JINCHANGHE IRON-COPPER-LEAD-ZINC POLYMETALLIC DEPOSIT IN BAOSHAN CITY,YUNNAN PROVINCE

作　　者：李振焕 刘学龙[1] 陈建航 罗应 张昌振 王帅帅[1] LI Zhenhuan;LIU Xuelong;CHEN Jianhang;LUO Ying;ZHANG Changzhen;WANG Shuaishuai(Land and Resource Engineering Institute,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Liaoning NO.8 Geological Team,Benxi 065900,Liaoning,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]辽宁省第八地质大队,辽宁本溪065900

出　　处：《地质力学学报》2019年第A01期115-118,共4页Journal of Geomechanics

基　　金：云南省科学技术奖“杰出贡献奖项目”专题四(2017001);自然资源部地质信息技术重点实验室开放课题(2018432)

摘　　要：滇西金厂河铁铜铅锌多金属矿床位于云南省保山地块北部、NS向保山—施甸复背斜与NNW向澜沧江断裂的锐角交汇部位的南部。文章在以往工作的基础上,研究金厂河铁铜铅锌多金属矿床的S-Pb同位素特征,这对分析该矿床成矿物质来源及探究成矿过程具有十分重要的意义。采样及测试结果显示,该矿床硫化物的δ34S值为+2.5‰^+11.1‰,平均+5.65‰,说明矿床硫化物硫的来源为深部幔源岩浆硫和混合硫(复杂硫);共生含硫矿物中富集δ34S的均值为:黄铜矿(+5.65‰)>闪锌矿(+5.38‰)>方铅矿(+3.45‰),表明矿床硫同位素分馏未达到平衡。207Pb/204Pb—206Pb/204Pb、208Pb/204Pb—206Pb/204Pb铅同位素模式图中样品点分布位置及朱炳泉Δβ—Δγ变化范围图解结果表明,该矿床铅同位素主要来源于上地壳,此外和深部岩浆的侵入活动相关。The Jinchanghe iron-copper-lead-zinc polymetallic deposit in western Yunnan Province is located in the north of Baoshan block and the south of the sharp intersection of NS-trending BaoshanShidian abdominal anticline and NNW-trending Lancang River fault.On the basis of previous work,the S-Pb isotope characteristics of Jinchanghe iron-copper-lead-zinc polymetallic deposit are studied,which is of great significance for analyzing the source of ore-forming materials and exploring the metallogenic process of the deposit.Sampling and testing results show that the sulfide valueδ34S of the deposit is+2.5‰^+11.1‰,with an average of+5.65‰,indicating that the sulfide source of the deposit is deep mantle-derived magmatic sulfur and mixed sulfur(complex sulfur);the average value of enriched Delta 34S in symbiotic sulfur-bearing minerals is chalcopyrite(+5.65‰)>sphalerite(+5.38‰)>galena(+3.45‰),indicating that the sulfur isotope fractionation of the deposit is not up to balance.The distribution of sample points in207Pb/204Pb^206Pb/204Pb,208Pb/204Pb^206Pb/204Pb lead isotope pattern and the variation range of Zhu BingquanΔβ-Δγshow that the lead isotopes of the deposit mainly originate from the upper crust and are related to the intrusion of deep magma.

关 键 词：S-Pb同位素 成矿物质来源 金厂河矿床 

分 类 号：P618.2[天文地球—矿床学]