| 锡石年代学和黑钨矿微量元素对湘东鸡冠石钨矿床的成因约束 |
| |
| 引用本文： | 熊峥嵘,李信念,祁程,熊伊曲.锡石年代学和黑钨矿微量元素对湘东鸡冠石钨矿床的成因约束[J].岩石学报,2021,37(3):769-780. |
| |
| 作者姓名： | 熊峥嵘 李信念 祁程 熊伊曲 |
| |
| 作者单位： | 中南大学, 有色金属成矿预测与地质环境监测教育部重点实验室, 长沙 410083;浏阳市自然资源局, 浏阳 410300;贵州省地质矿产勘查开发局一〇六地质大队, 遵义 563000;核工业航测遥感中心, 石家庄 050000 |
| |
| 基金项目： | 本文受国家自然科学基金项目（41803044）、湖南省重点领域研发计划项目（2019SK2261）、湖南省科技厅科普专题（202K4082）和湖南省地质院科研项目（HNGSTP202105）联合资助. |
| |
| 摘 要： | 钨是我国传统的优势金属矿产,同时也是国家高新技术领域不可或缺的战略性关键矿产之一。鸡冠石矿床是近年湘东邓阜仙地区新发现的一处钨矿床,具有良好的钨锡多金属资源前景,但其成矿时代和成因尚不清楚。本文在详细的矿床地质特征观察基础上,选取鸡冠石钨矿床中黑钨矿和锡石开展原位LA-ICP-MS微量元素分析和U-Pb定年研究,并将该矿床与相邻矿床进行对比研究。结果显示:1)与黑钨矿密切共生的锡石U-Pb Tera-Wasserburg反等时线年龄为153.2±1.8Ma(MSWD=1.15),与湘东钨矿床晚侏罗世钨锡成矿时代吻合;2)鸡冠石钨矿床紧邻湘东钨矿床北组脉,且矿脉产状和形态等特征也类似;3)鸡冠石矿床中黑钨矿也与湘东钨矿床北组脉典型特征类似,黑钨矿HREE总量和标准化后的REE配分曲线与湘东钨矿床第一期黑钨矿的特征相似。黑钨矿稀土总量对比研究指示成矿流体可能是从湘东钨矿流向鸡冠石钨矿。综合鸡冠石钨矿床与湘东钨矿床紧密的时空关系以及相似的矿床特征,本文认为鸡冠石矿床为一个与晚侏罗世花岗岩有关的岩浆期后热液矿床,同时黑钨矿微量元素特征指示该矿床可能形成于一个富挥发分、低p H和高Eh的流体环境中。
|
| 关 键 词： | 锡石U-Pb定年 黑钨矿微量元素 钨矿床 矿床成因 |
| 收稿时间： | 2020/11/28 0:00:00 |
| 修稿时间： | 2021/2/22 0:00:00 |
Geochronology of cassiterite and trace element compositions of wolframite: Constraints to the ore genesis of Jiguanshi tungsten deposit, eastern Hunan Province |
| |
| XIONG ZhengRong,LI XinNian,QI Cheng,XIONG YiQu.Geochronology of cassiterite and trace element compositions of wolframite: Constraints to the ore genesis of Jiguanshi tungsten deposit, eastern Hunan Province[J].Acta Petrologica Sinica,2021,37(3):769-780. |
| |
| Authors: | XIONG ZhengRong LI XinNian QI Cheng XIONG YiQu |
| |
| Institution: | MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China;Natural Resources Bureau, Liuyang 410300, China;106 Geological Party of Guizhou Geological Mineral Exploration Development Authority, Zunyi 563000, China;Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050000, China |
| |
| Abstract: | Tungsten is a traditionally dominant mineral resource of China, and it is also one of the indispensable strategic and critical materials for national high-technology. The Jiguanshi tungsten deposit is a newly discovered one in the eastern Hunan Province, which is considered to be a promising tungsten reserve. Whereas, the age and ore genesis of the deposit are remained unclear. Based on detailed geological observations, we present new cassiterite U-Pb ages and wolframite trace element compositions of the Jiguanshi deposit, and compare the ore veins and mineral assemblage features between the Jiguanshi and adjacent deposits to constrain its ore genesis. The result shows that: (1) the cassiterite Tera-Wasserburg U-Pb age is 153.2±1.8Ma (MSWD=1.15) and is consistent with the Late Jurassic mineralization age of the Xiangdong tungsten deposit; (2) the ore veins features of the Jiguanshi deposit is similar to the north vein group in the Xiangdong deposit; (3) the features of the wolframite in the Jiguanshi is similar to those of the north vein group in the Xiangdong deposit, and the HREE contents and chondrite-normalized REE patterns of the wolframite from the two deposits are also similar. The comparative study of wolframite trace elements between the Xiangdong and the Jiguanshi deposits indicates the ore-forming fluid might flow from Xiangdong to Jiguanshi. Combining the timing of the mineralization of the Jiguanshi deposit and the close spatio-temporal relationship between the Jiguanshi deposit and the north vein group of the Xiangdong deposit, we suggest that the Jiguanshi is a magmatic-hydrothermal deposit related to the Late Jurassic granites. The trace element compositions of the wolframite at Jiguanshi indicate that the deposit might be formed in a volatiles-rich, low-pH and high-Eh environment. |
| |
| Keywords: | Cassiterite U-Pb age Wolframite trace element composition Tungsten deposit Ore genesis |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
|
