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.
作者
李振焕
刘学龙
陈建航
罗应
张昌振
王帅帅
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)
出处
《地质力学学报》
CSCD
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)
