摘要
勐兴铅锌矿床是滇西保山地块内迄今勘查程度最高的大型铅锌矿床。由于该矿床的研究程度相对较低,其成因认识存在较大争议。本文使用ICP-MS对该矿床中主要矿石矿物闪锌矿进行了微量元素分析,以探讨该矿床的成矿作用。结果表明,该矿床各阶段闪锌矿的颜色、Fe和Mn含量及Ge/In值特征指示矿床的成矿流体温度不高,可能为与低温盆地流体有关的铅锌矿床。此外,闪锌矿以ΣREE较低、LREE/HREE值大和δEu值小为特征,暗示闪锌矿形成于亏损Eu的还原性流体。结合矿床地质特征、闪锌矿微量元素特征及lnGa-lnIn关系判别图解认为,勐兴铅锌矿床属于密西西比河谷型铅锌矿床(MVT型)。
The Mengxing Pb-Zn deposit,located in the Baoshan Block in western Yunnan,is a large-scale Pb-Zn deposit with the highest level of exploration so far in the area.Due to the low degree of research,however,there is a great dispute in the ore genesis.Trace elements in the sphalerite,the main ore mineral,have been analyzed by using ICP-MS to discuss the metallogenesis of the deposit in this paper.The results show that the colors,Fe and Mn contents,and Ge/In ratios of sphalerites of various stages suggest that the temperature of ore-forming fluid is not high and formation of the deposit could be related to the low temperature basin fluid.In addition,the sphalerites are characterized with low REE abundances,high LREE/HREE ratios,and lowδEu values,implying that the sphalerite was formed in Eu-depleted reduced fluid.Combining with geological features of the deposit,characteristics of trace elements of sphalerites,and the lnGa-lnIn discriminant diagram for sphalerites,it is believed that the Mengxing Pb-Zn deposit belongs to the MVT-type one.
作者
刘锦康
邓明国
李余华
刘阳
LIU Jin-kang;DENG Ming-guo;LI Yu-hua;LIU Yang(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;Geological Team 209,Yunnan Nuclear Industry,Kunming 650032,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2020年第1期133-143,共11页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(41363001,41762009)。
关键词
闪锌矿
微量元素
MVT矿床
勐兴铅锌矿床
滇西
sphalerite
trace elements
MVT deposit
Mengxing Pb-Zn deposit
western Yunnan
