西南低温成矿域锑、金矿床中方解石的中重稀土富集机理及指示意义

项目名称： 西南低温成矿域锑、金矿床中方解石的中重稀土富集机理及指示意义

项目编号： No.41303038

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 王加昇

作者单位： 昆明理工大学

项目金额： 25万元

中文摘要： 中国西南低温成矿域是世界著名的Sb、Au、Hg、As、Tl等低温矿集区。区内发育有独具特色稀土特征的方解石，包括锑矿床中方解石为中重稀土富集型，卡林型金矿中方解石为中稀土富集型，汞矿床中方解石则为轻稀土富集型。近年来，不少学者利用方解石中、重稀土元素富集的特点，成功进行了成矿时代（Sm-Nd定年）、找矿勘查等研究。然而，关于中、重稀土元素富集型方解石的分布特征、中、重稀土元素富集机理等问题还没有得到足够的重视和研究。本项目拟选取区内典型矿床（锡矿山、巴年锑矿床，水银洞金矿床等）中方解石作为主要研究对象，利用ICP-MS, ICP-AES、EPMA、TEM等进行主微量元素分析和微区分析，并结合顺序提取实验、辉锑矿单个包裹体LA-ICP-MS成分分析等手段，以期阐明方解石富集中、重稀土元素的机理，为方解石Sm-Nd定年、找矿勘查研究提供理论依据，进而探讨西南低温成矿域流体演化及共生分异机制。

中文关键词： 卡林型金矿床；锑矿床；方解石；稀土元素；Fe;Mn纳米微粒

英文摘要： The "low-temperature metallogenic domain in southwestern China" is a word-famous Sb, Au, Hg, As, Tl epithermal ore district. Calcites in this region are special for their unique REE characteristics. Which are characterized by MREE- and HREE-enriched in the antimony deposits, and MREE-enriched in the carlin-type gold deposits. On the other hand, they are LREE-enriched in the mercury deposits. Recently, many scholars have successfully attempted to study about geochronology (Sm-Nd dating) and prospecting, utilyzing the characteristics of MREE- and HREE-rich in calcites. While the key scientific problems about the distribution of the calcites and the mechanism of MREE- and HREE-rich in calcites have not been realized enough. In this project, calcites from the representative ore deposits (Xikuangshan and Banian antimony deposits, Shuiyindong gold deposit etc) has been selected as the main research object. We intend to use ICP-MS, ICP-AES for major and trace element analyses, use EPMA, TEM for microanalyses, and combine sequential extraction experiments, stibnite inclusions LA-ICP-MS analysis and other analytical methods. It is aim to clarify the mechanisms of calcite enrichment of HREE and MREE, and provide theoretical basis for the study of ore-forming time (Sm-Nd dating) and prospecting. And then explore fluid evol

英文关键词： Carlin-type gold deposit；antimony deposit；calcite；rare earth element (REE)；Fe; Mn nanoparticle