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。
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.
出处
《岩矿测试》
CAS
CSCD
北大核心
2011年第2期144-149,共6页
Rock and Mineral Analysis
基金
国家深部探测专项资助(SinoProbe-03-03)
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)
"我国重要矿产和区域成矿规律研究"项目资助
关键词
RE-OS年龄
矿床地质特征
新安钼矿
Re-Os isochronal ages
deposit geological characteristics
Xin′an molybdenum deposit
