云南都龙超大型锡锌多金属矿床中闪锌矿微量及稀土元素地球化学特征

发布时间：2018-01-25 02:24

本文关键词： 都龙锡锌多金属矿床闪锌矿微量元素稀土元素燕山晚期隐伏花岗岩　出处：《吉林大学学报(地球科学版)》2017年03期 　论文类型：期刊论文

【摘要】：云南马关都龙锡锌多金属矿床位于滇东南老君山锡锌钨多金属成矿区南部,是我国三大锡石硫化物矿床之一,目前对其矿床成因认识存在较大分歧。本文采用ICP-MS对都龙矿床中闪锌矿微量元素及稀土元素组成进行分析,以探讨该矿床成矿作用,为甄别已有成因观点提供证据。结果表明,矿床中闪锌矿以富集Fe、Mn、In、Co、Sn和贫Cd、Ga、Ge、Ni等元素为特征,成矿温度属于中—高温,其微量元素组成与白牛厂矿床(与燕山晚期花岗岩有关的矽卡岩型矿床)中的闪锌矿非常相似,和远源矽卡岩型铅锌矿床(核桃坪和芦子园)中闪锌矿存在一定差异,明显有别于喷流沉积型铅锌矿床(云南澜沧老厂和广东大宝山)中闪锌矿。此外,该矿床闪锌矿稀土配分模式多为轻稀土元素富集中等的向右倾斜曲线,以LREE/HREE值高、Eu负异常明显和Ce异常不明显为特征,与矿区燕山晚期隐伏花岗岩稀土元素特征基本一致,成矿物质来源以矿区燕山晚期隐伏花岗岩为主。结合近期矿山开采和地质勘探所揭露的矿化和矽卡岩蚀变的垂向分带等矿床地质特征,认为云南马关都龙锡锌多金属矿床属于与燕山晚期花岗岩有关的矽卡岩型多金属矿床,其中层状矽卡岩的形成应为成矿流体顺层交代的结果,矿化类型和围岩蚀变的分带与隐伏岩体的距离有关。
[Abstract]:Maguan Dulong tin and zinc polymetallic deposit is located in the south of Laojunshan tin and tungsten polymetallic metallogenic deposit in southeastern Yunnan Province. It is one of the three major cassiterite sulphide deposits in China. In this paper, ICP-MS is used to analyze the trace elements and rare earth elements of sphalerite in the Dulong deposit, in order to discuss the mineralization of the deposit. The results show that the sphalerite in the deposit is characterized by the enrichment of Fe _ (mn) in CoCoSn and the depletion of CD _ (2) O _ (2) O _ (2) O _ (2) Ni. The ore-forming temperature is medium-high temperature and its trace element composition is very similar to that of sphalerite in the bainiuchang deposit (skarn type deposit related to late Yanshanian granites). There are some differences between sphalerite and sphalerite in far source skarn type lead-zinc deposit (Juzuping and Luziyuan), which is obviously different from sphalerite in exhalative sedimentary type lead-zinc deposit (Lancang Laochang, Yunnan and Dabaoshan, Guangdong). The REE distribution pattern of sphalerite in this deposit is mostly light rare earth element enrichment medium right tilt curve, which is characterized by obvious negative anomaly of EU with high LREE/HREE value and no obvious ce anomaly. It is consistent with the REE characteristics of the late Yanshanian concealed granite. The ore-forming material comes mainly from the late Yanshanian concealed granite in the ore area, combined with the geological characteristics of mineralization and vertical zoning of skarn alteration revealed by recent mining and geological exploration. It is considered that the Maguan Dulong tin and zinc polymetallic deposit in Yunnan is a skarn type polymetallic deposit related to late Yanshanian granites and the formation of layered skarn should be the result of metallogenic fluid metasomatism. The type of mineralization and the zoning of wall rock alteration are related to the distance of concealed rock mass.
【作者单位】：中国科学院地球化学研究所/矿床地球化学国家重点实验室;中国科学院大学地球科学学院;
【基金】：国家自然科学基金项目(41173063,41673056) 云南华联锌铟股份有限公司科研项目(KY20120910) 中国科学院地球化学研究所“十二五”项目群(SKLODG-ZY125-02)~~
【分类号】：P595;P618.2
【正文快照】： Supported by the National Natural Science Foundation of China(41173063,41673056),Scientific Research Project ofYunnan Hualian Zinc and Indium Co.LTD.(KY20120910)and 12th Five-Year Plan Project of State Key Laboratory ofOre-Deposit Geochemistry,Chinese Ac

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