| 西藏那茶淌北铅锌矿床矽卡岩地球化学特征及其成因 |
| |
| 引用本文： | 戴成龙.西藏那茶淌北铅锌矿床矽卡岩地球化学特征及其成因[J].地质与勘探,2017,53(5):991-1000. |
| |
| 作者姓名： | 戴成龙 |
| |
| 作者单位： | 1. 成都理工大学地球科学学院,四川成都,610059;2. 西藏华钰矿业股份有限公司,西藏拉萨,850000;3. 中国地质科学院矿产资源研究所,北京,100037 |
| |
| 基金项目： | 公益性行业专项（编号：201511022-02,201511017）资助 |
| |
| 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。
|
| 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 |
| 收稿时间： | 2017/5/2 0:00:00 |
| 修稿时间： | 2016/6/23 0:00:00 |
Geochemical characteristics and origin of skarns in the Nachatangbei Pb-Zn deposit in Tibet |
| |
| Dai Cheng-long.Geochemical characteristics and origin of skarns in the Nachatangbei Pb-Zn deposit in Tibet[J].Geology and Prospecting,2017,53(5):991-1000. |
| |
| Authors: | Dai Cheng-long |
| |
| Abstract: | The Nachatangbei Pb-Zn deposit, located in the northern part of the eastern Gangdise meltallogenic belt, is composed of skarn and Pb-Zn ore bodies, thus being a typical skarn type deposit. The geochemical analysis of skarns, marble (limestone) and biotite granite in the deposit shows that there are obvious exchanges among Si, Al, Fe, Ti, Mg, Ca and Mn of these three rocks. For the rare earth elements, they have LREE enrichment, HREE loss, and the development of Eu and Ce negative anomalies and similar REE distribution patterns, indicating the causes of these rocks have a certain relationship. Combined with three different lithologic geochemical characteristics, strong light and heavy rare earth element differentiations, and negative Eu and Ce anomalies, this study suggests that the skarns came from the high temperature reduction hydrothermal metasomeric carbonate, and during its formation the fluid might have a small amount of seawater added. |
| |
| Keywords: | geochemical analysis Eu and Ce anomaly diagenesis environment skarns Nachatangbei Tibet |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质与勘探》浏览原始摘要信息 |
| 点击此处可从《地质与勘探》下载免费的PDF全文 |
|
