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辉钼矿的铼-锇同位素地质年龄测定方法研究
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Cite This Paper:.1994.A STUDY ON THE RHENIUM-OSMIUM GEOCHRO- NOMETRY OF MOLYBDENITES[J].Acta Geologica Sinica,68(4):
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杜安道  何红蓼  殷宁万  邹晓秋  孙亚利  孙德忠  陈少珍  屈文俊
中国地质科学院岩矿测试技术研究所 北京 (杜安道,何红蓼,殷宁万,邹晓秋,孙亚利,孙德忠,陈少珍)
,中国地质科学院岩矿测试技术研究所 北京(屈文俊)
基金项目:国家自然科学基金和地质行业科学技术发展基金联合资助项目(编号49173164)
中文摘要:本研究在国内首次将同位素稀释等离子体质谱法应用于铼-锇同位素系统地质年龄测定。建立的化学分离方法包括碱熔分解样品、丙酮萃取分离铼、 蒸馏法分离锇。全流程化学回收率在90%以上。铼和~(187)Os的空白值分别为0.07ng和0.01ng。用本法测定了我国4个钼矿床的辉钼矿矿化年龄,其年龄测定精度(2σ)在3%以内。测定结果与地质背景的符合情况令人满意。直接测定金属矿床年龄的铼-锇法较之间接测定围岩时代来推断矿化年龄的其它定年方法更能反映真实年龄。鉴于许多热液硫化物矿床常含有辉钼矿,该法有较广泛的应用前景。
中文关键词:铼-锇法,辉钼矿,成矿年龄测定,同位素稀释-等离子体质谱
 
A STUDY ON THE RHENIUM-OSMIUM GEOCHRO- NOMETRY OF MOLYBDENITES
Du Andao  He Hongliao  Yin Ningwan  Zou Xiaoqiu  Sun Yiali Sun Dezhong  Chen Shaozhen  Qu Wenjun
keywords:rhenium-osmium method, molybdenite, dating of ore-forming age, isotope dilution, inductively couppled plasmasource mass spectrometry
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