| 西藏蒙亚啊铅锌矿床矽卡岩矿物特征及其意义 |
| |
| 引用本文： | 邬秋敏,陈翠华,涂宗林,张燕,宋志娇,赖翔.西藏蒙亚啊铅锌矿床矽卡岩矿物特征及其意义[J].现代地质,2018,32(5):874. |
| |
| 作者姓名： | 邬秋敏 陈翠华 涂宗林 张燕 宋志娇 赖翔 |
| |
| 作者单位： | (1成都理工大学 地球科学学院，四川 成都610059；2四川省地质矿产勘查开发局 四〇三地质队，四川 峨眉614200) |
| |
| 基金项目： | 四川省教育厅项目(SZX040)；中国地质调查局项目(12120113036200)；国家自然科学基金项目(41372093)。 |
| |
| 摘 要： | 西藏蒙亚啊铅锌矿床是冈底斯北缘一个重要的层状或似层状矽卡岩矿床，来姑组为矿床的主要容矿层位。矿区矽卡岩矿物主要有硅灰石、辉石、石榴石、透闪石、阳起石、绿帘石和绿泥石等。根据矿物的共生组合及交代关系，推断矿床经历了4个成矿阶段：早期矽卡岩阶段、晚期矽卡岩阶段、石英-硫化物阶段和碳酸盐阶段。结合矿物手标本及显微镜下观察，通过对矽卡岩矿物的电子探针测试，分析石榴石、辉石和硅灰石的矿物特征，结果表明：西藏蒙亚啊铅锌矿床属钙质矽卡岩矿床，石榴石和辉石的组分变化较大，分别为And599~9472Gro0~3787(Pyr+Spe+Alm)087~678和Di1885~9444Hd339~7058Jo009~1114，硅灰石的矿物组分为Wo9900~9944Fs037~078En007~023。石榴石属钙铁榴石-钙铝榴石系列，且环带发育，辉石为透辉石-钙铁辉石系列，硅灰石组分较纯。西藏蒙亚啊矽卡岩为钙质矽卡岩，其矿床在形成过程中经历了热液流体的多期多阶段演化，矿床形成环境也并不是稳定的封闭体系。矽卡岩矿物成分特征表明，蒙亚啊铅锌矿床的成矿环境是一个低酸性的氧化-弱氧化环境。
|
| 关 键 词： | 成矿环境 矽卡岩矿物特征 蒙亚啊铅锌矿床 西藏 |
Characteristics and Significance of Skarn Minerals of Mengya'a Pb Zn Deposit in Tibet |
| |
| WU Qiumin,CHEN Cuihua,TU Zonglin,ZHANG Yan,SONG Zhijiao,LAI Xiang.Characteristics and Significance of Skarn Minerals of Mengya'a Pb Zn Deposit in Tibet[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(5):874. |
| |
| Authors: | WU Qiumin CHEN Cuihua TU Zonglin ZHANG Yan SONG Zhijiao LAI Xiang |
| |
| Institution: | (1College of Earth Sciences, Chengdu University of Technology, Chengdu, Sichuan610059, China;
2No403 Geological Party, Sichuan Bureau of Geology and Mineral Exploration and Development,Emei, Sichuan614200, China) |
| |
| Abstract: | Mengya'a lead zinc deposit in Tibet is an important stratified or stratoid skarn deposit in the northern margin of Gangdise. Laigu Formation, the main ore hosting strata, provides the main metallogenic material. The main skarn minerals consist mainly of wollastonite, pyroxene, garnet, hopfnerite, actinolite, epidote, chlorite etc.According to the association combination and replacement relationship of minerals, the authors infer that Mengya'a lead zinc deposit experienced four stages, ie, early skarn stage, late skarn stage, quartz sulfide stage and carbonation stage. Combining with mineral hand specimens and microscopic observation and the electron microprobe analysis, the authors analyzed the mineralogical characteristics of garnet, pyroxene and wollastonite. The results of electron microprobe analysis show that Mengya'a lead zinc deposit in Tibet belongs to calcareous skarn deposit; the composition of garnet and pyroxene changed greatly, which respectively were And599-9472 Gro0-3787(Pyr+Spe+Alm)087-678 and Di1885-9444 Hd339-7058 Jo009-1114; the mineral composition of wollastonite is Wo9900-9944Fs037-078En007-023. The garnets are mainly andradite grossuthe, and the garnets always develop zoning structure. The pyroxene is diopside hedenbergite series, and the wollastonite is pure. The skarn of Mengya'a deposit in Tibet is calcareous skarn. Its ore deposit experienced multi stage and multi order evolution of hydrothermal fluid during its formation, and the forming environment of the deposit also is not a stable close system. The mineral composition characteristics of skarn indicate that the metallogenic environment of Mengya'a Pb Zn deposit was a low acid and oxidation weak oxidation environment. |
| |
| Keywords: | metallogenic environment mineral characteristics of skarn Mengya'a Pb Zn deposit Tibet |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《现代地质》浏览原始摘要信息 |
| 点击此处可从《现代地质》下载免费的PDF全文 |
|
