中国地质Issue(6)：1821-1832,12.
辽宁鞍本地区铁矿床黄铁矿和辉钼矿Re-Os同位素测年及其地质意义
Re-Os isotopic dating of pyrite and molybdenite from the iron deposits in Anshan-Benxi area of Liaoning Province and its geological significances
摘要
Abstract
Rhenium and osmium isotopes in a molybdenite sample and ten pyrite samples were used to determine the timing of mineralization by ICP-MS. Re-Os model age of the molybdenite sample is(2376 ± 37)Ma, Re-Os ages of the ten pyrite samples yielded three kinds of ages:①(2567±36)Ma—(2540±37)Ma (model age);②(2237±112)Ma (model dating);③(1572±140)Ma (isochron age). These data suggest that the molybdenite of(2376 ± 37)Ma was formed during early Proterozoic, and was the oldest Re-Os model age of molybdenite, the pyrite of(2237±112)Ma was formed during early Proterozoic, and both of them indicate that the molybdenite and the pyrite were derived from the crust and represented an important hydrothermal activity in 2.3 Ga;the pyrite of(2567 ± 36)Ma—(2540 ± 37)Ma was formed during new Archaeozoic period and yielded the oldest Re-Os model age, which indicates that the pyrite was formed with BIF in 2.5 Ga;the pyrite of(1572±140)Ma was formed during middle Proterozoic, which indicates that pyrite was derived from the crust and represented a hydrothermal activity. The Re-Os isotopic dating result provides a new proof for the existence of hydrothermal activity in iron deposits of the Anshan-Benxi area, and is also important for understanding the ore-forming processes and tectonic evolution in this area.关键词
Re-Os同位素测年/黄铁矿/辉钼矿/条带状铁建造/鞍本地区Key words
Re-Os isotopic dating/pyrite/molybdenite/banded iron formations/Anshan-Benxi area分类
天文与地球科学引用本文复制引用
刘明军,李厚民,于仕祥,许宗宪,姚良德,文屹,赵洪振..辽宁鞍本地区铁矿床黄铁矿和辉钼矿Re-Os同位素测年及其地质意义[J].中国地质,2014,(6):1821-1832,12.基金项目
国家973项目（2012CB416801）和国土资源部公益性行业科研专项（200911007-15、201111002）联合资助。 （）
