地质学报2011，Vol.85Issue(5)：810-820,11.DOI:CNKI:11-1951/P.20110512.0910.017
宁芜盆地玢岩型铁矿床的成矿时代:金云母40Ar-39Ar同位素年代学研究
Geochronology of the Porphyry-like Type Iron Deposits in Ning-Wu Basin:Evidence from 40Ar-39Ar Phiogopite Dating
摘要
Abstract
The Ning-Wu Basin is the important component of the Middle-Lower Yangtze metallogenic belt,which hosts many a porphyry-like type iron deposits. However, the research for precise ore-forming epoch and tectonic setting has been very poor. Basing on detailed field geological works, we present new 40Ar39Ar phlogopite ages for the typical Taocun, Baixiangshan and Hemushan iron deposits to constrain the timing and duration of mineralization in the basin. Phlogopite from the Taocun, Baixiangshan and Hemushan iron deposits yielded 40Ar-39Ar plateau ages of 129.3±1.1Ma, 130.7±1.1Ma and 129. l±0.9 Ma, respectively. The dating results indicate that different porphyry-like type iron deposits in the NingWu Basin all formed in early stage of Early Cretaceous about 130 Ma, obviously later than skarn-porphyry Cu-Au deposits related to high-k calc-alkaline intrusions in uplift areas. The porphyry-like type iron deposits in the Ning-Wu volcanic basin is believed to form under a regional lithospheric and thinning environment.关键词
成矿时代/玢岩型铁矿/宁芜盆地/构造背景Key words
Geochronology/ porphyry-like type iron deposits, tectonic framework/ Ning-Wu Basin引用本文复制引用
范裕,周涛发,袁峰,张乐骏,钱兵,马良,谢杰,杨西飞..宁芜盆地玢岩型铁矿床的成矿时代:金云母40Ar-39Ar同位素年代学研究[J].地质学报,2011,85(5):810-820,11.基金项目
本文为国家自然科学基金项目(编号40830426,4080301 5)、国家"深部探测技术与实验研究专项计划"专题(编号SinoProbe-03-02-05)及国土资源部公益性行业科研专项项目课题(编号201011047-07),中国地质调查局地质调查工作项目(编号:1212011121115)、安徽省地质公益性地质项目(编号2007-1)和新世纪优秀人才支持计划项目(NCET-10-0324)资助的成果. （编号40830426,4080301 5）
