西藏那茶淌北铅锌矿床矽卡岩地球化学特征及其成因

发布时间：2018-02-03 03:04

本文关键词： 地球化学 Eu和Ce异常成岩环境矽卡岩那茶淌北西藏　出处：《地质与勘探》2017年05期 　论文类型：期刊论文

【摘要】：那茶淌北铅锌矿床位于西藏冈底斯成矿带东段北部,主要由矽卡岩铅锌矿体组成,是一个典型的矽卡岩型矿床。笔者通过对矿床内的矽卡岩、大理岩(灰岩)、黑云母花岗岩的地球化学对比分析表明:在主量元素方面,显示Si、Al、Fe、Ti、Mg、Ca、Mn等元素在矽卡岩、大理岩、黑云母花岗岩之间发生明显的交换;在稀土元素方面,矽卡岩、大理岩和黑云母花岗岩均具有LREE富集,HREE亏损,并且发育Eu和Ce负异常和相似的REE配分模式,说明矽卡岩的成因与大理岩、黑云母花岗岩具有一定关系。结合三种不同岩性的地球化学特征,强烈的轻、重稀土分异,Eu、Ce负异常,推测矽卡岩由中高温还原热液交代碳酸盐而成,矽卡岩成岩过程中可能有少量海水加入。
[Abstract]:Nachatangbei Pb-Zn deposit is a typical skarn type deposit located in the northern part of Gangdis metallogenic belt, Tibet, and is mainly composed of skarn lead-zinc orebody. The author analyzes the skarn, marble (limestone) in the deposit. Geochemical comparative analysis of biotite granite shows that the main elements are Si-AlAlFE-Fe-Ti-Ti-Mg-Ca-Mn in skarn, marble and so on. There is obvious exchange between biotite granites; In terms of rare earth elements, skarn, marble and biotite granites all exhibit LREE enrichment and hree depletion, and develop negative EU and ce anomalies and similar REE patterns. It is suggested that the genesis of skarn is related to marble and biotite granites. In combination with the geochemical characteristics of three different lithology, there is a strong negative anomaly of EUC _ e in light and heavy rare earth differentiation. It is inferred that skarn is formed by medium and high temperature reductive hydrothermal metasomatic carbonate, and a small amount of seawater may be added in the diagenetic process of skarn.
【作者单位】：成都理工大学地球科学学院;西藏华钰矿业股份有限公司;中国地质科学院矿产资源研究所;
【基金】：公益性行业专项(编号:201511022-02,201511017)资助
【分类号】：P618.4
【正文快照】： Dai Cheng-long,Leng Qiu-feng,Zheng Wen-bao,Tang Pan.Geochemical characteristics and originof skarns in the Nachatangbei Pb-Zn deposit in Tibet[J].Geology and Exploration,2017,53(5):0991-1000.西藏冈底斯成矿带位于雅鲁藏布江结合带和班公湖-怒江成矿带之间,由

【相似文献】