江西广昌新安钼矿床地质特征及其铼-锇同位素测年

曾载淋; 刘善宝; 邓茂春; 黄凡; 陈毓川; 赖志坚; 屈文俊

江西广昌新安钼矿床地质特征及其铼-锇同位素测年

1.
中国地质科学院, 北京 100037
2.
江西地勘局赣南地质调查大队, 江西赣州 341000
3.
中国地质科学院矿产资源研究所, 北京 100037
4.
江西地勘局赣南地质调查大队, 江西赣州 341000
5.
中国地质科学院, 北京 100037
6.
中国地质科学院, 北京 100037
7.
江西地勘局赣南地质调查大队, 江西赣州 341000
8.
国家地质实验测试中心, 北京 100037

基金项目:

"我国重要矿产和区域成矿规律研究"项目资助

中国地质科学院矿产资源研究所基本业务费专项基金资助(K0906)

国家深部探测专项资助(SinoProbe-03-03)

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- 收稿日期: 2010-05-10
- 修回日期: 2010-10-05

Geological Characteristics and Re-Os Dating of the Xin'an Molybdenum Deposit in Jiangxi Province

1.
Graduate School, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Southern Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Southern Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China
5.
Graduate School, Chinese Academy of Geological Sciences, Beijing 100037, China
6.
Graduate School, Chinese Academy of Geological Sciences, Beijing 100037, China
7.
Southern Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China
8.
National Research Center for Geoanalysis, Beijing 100037, China

摘要

摘要: 广昌新安钼矿是武夷山西坡中段新发现的斑岩型钼矿床。文章概要地介绍了该矿床的地质特征,并利用Re-Os同位素定年方法对新安钼矿体中的辉钼矿进行了成矿年代的测定,获得辉钼矿同位素的模式年龄为(166.7±2.3) Ma~(169.5±2.4) Ma,计算出等时线年龄为(168.3±1.7) Ma,表明其钼矿成矿作用发生于燕山早期,属于华南中生代大规模成矿作用第一阶段的产物。矿床成矿时代的精确厘定,说明该区在燕山期大规模钨锡成矿作用之前(165~150 Ma),可能存在一期独立的钼成矿作用。区域钼矿床年龄数据统计表明,本区至少存在三期独立的钼成矿作用,分别集中在130~140 Ma、150~160 Ma和165~170 Ma,意味着本区钼成矿作用经历了漫长的演化过程,这对区域岩浆岩活动及其成矿作用研究和找矿工作具有指导意义。
- Re-Os年龄 /
- 矿床地质特征 /
- 新安钼矿
Abstract: The Xin'an molybdenum deposit, located in the middle of Wuyi Mountain's western slope, is a newly discovered porphyry Mo deposit. The geological characteristics of the deposit is presented in this paper. The Re-Os model ages of the molybdenites are between (166.7±2.3) Ma and (169.5±2.4) Ma, with a calculated isochronic age of (168.3±1.7) Ma indicating that molybdenum mineralization occurred in the early Yanshanian period, belonging to the Mesozoic first large-scale mineralization. The age of this deposit indicates that a dependent Mo mineralization may have existed in this area before large-scale tungsten/tin mineralization. According to collected molybdenite Re-Os dating results, molybdenum mineralization times are mainly concentrated in Yanshanian which includes three stages of 130-140 Ma, 150-160 Ma and 165-170 Ma, meaning molybdenum mineralization is a long-term evolutionary process. This result is not only important for studying the regional magmatic activity and mineralization, but it can also guide further exploration work.
- Re-Os /
- isochronal /
- ages

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参考文献(20)

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江西广昌新安钼矿床地质特征及其铼-锇同位素测年

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Geological Characteristics and Re-Os Dating of the Xin'an Molybdenum Deposit in Jiangxi Province

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