| 电子探针测年方法应用于粤北长江岩体的铀矿物年龄研究 |
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| 引用本文： | 张龙,陈振宇,田泽瑾,黄国龙.电子探针测年方法应用于粤北长江岩体的铀矿物年龄研究[J].岩矿测试,2016,35(1):98-107. |
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| 作者姓名： | 张龙 陈振宇 田泽瑾 黄国龙 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院, 北京 100083,中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037,中国地质大学(北京)地球科学与资源学院, 北京 100083,核工业290研究所, 广东 韶关 512026 |
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| 基金项目： | 中国地质大调查项目"广东诸广山南部地区铀多金属矿成矿地质条件与综合找矿方法研究"(12120113090500) |
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| 摘 要： | 晶质铀矿被认为是花岗岩型铀矿成矿的主要矿源提供者,在评价岩体的含矿性和确定成岩成矿年龄方面有重要意义。长江岩体属于诸广山复式岩体的一部分,是粤北地区重要的产铀花岗岩体,本文利用电子探针对该岩体中的铀矿物进行研究。结果表明:长江岩体中的铀矿物多以充填或被黄铁矿包围的形式存在,或者分布于石英、黑云母、绿泥石等矿物中;铀矿物类型主要有晶质铀矿、沥青铀矿、铀石、铀钍石四种。晶质铀矿/沥青油矿的化学年龄值可分为三组:~155 Ma、~106 Ma和~74 Ma。第一组年龄代表岩体的形成时代,后两组年龄代表铀矿的多期次成矿作用年龄。铀矿物从成岩后到~106 Ma,成分没有发生明显变化,直到~74 Ma后才发生明显的U元素活化、迁移。因此,可以推测长江岩体地区主要的铀矿成矿期应发生在~74 Ma及之后。
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| 关 键 词： | 电子探针定年 晶质铀矿 铀矿成矿 长江岩体 粤北 |
| 收稿时间： | 2015/9/11 0:00:00 |
| 修稿时间： | 2016/1/12 0:00:00 |
The Application of Electron Microprobe Dating Method on Uranium Minerals in Changjiang Granite,Northern Guangdong |
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| ZHANG Long,CHEN Zhen-yu,TIAN Ze-jin and HUANG Guo-long.The Application of Electron Microprobe Dating Method on Uranium Minerals in Changjiang Granite,Northern Guangdong[J].Rock and Mineral Analysis,2016,35(1):98-107. |
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| Authors: | ZHANG Long CHEN Zhen-yu TIAN Ze-jin and HUANG Guo-long |
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| Institution: | School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China,Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China and Research Institute No.290, China National Nuclear Corporation, Shaoguan 512026, China |
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| Abstract: | Uraninite is considered to be the main ore source provider of granite-hosted uranium deposits,it plays a significant role in mineralization assessment of granite and constraining the age of digenesis and uranium mineralization.Changjiang granite is a part of the Zhuguang Mountains,and is important U-bearing granite in the north of Guangdong.Uranium minerals in this granite are studied by Electron Microprobe.Results show that uranium minerals mainly fill in the spaces between minerals or are surrounded by pyrite.Uranium minerals are also found in quartz,biotite,chlorite and other minerals.The main types of uranium minerals are uraninite,pitchblende,uranothorite and uranophane.The chemical ages of uraninite and pitchblende dated by Electron Microprobe can be divided into three groups,155 Ma,106 Ma and 74 Ma.The first group represents the formation age of Changjiang granite mass,and the second and third groups represent multiple stages of uranium mineralization.From rock formation to about 106 Ma,the composition of uraninite has not changed significantly.Obvious U activation and migration did not happen until 74 Ma,so the main uranium mineralization of Changjiang granite may have occurred at about 74 Ma or later. |
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| Keywords: | Electron Microprobe dating uraninite uranium mineralization Changjiang granite northern Guangdong |
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