摘要
通过对东天山接触交代型铁矿中透闪石单矿物进行40Ar/39Ar年龄测定,获得坪年龄(387.21±0.68)Ma和等时线年龄(389.65±1.46)Ma。初步认为,此类接触交代型铁矿的成矿时代为387Ma左右。结合区域构造背景,可以认为,在早古生代东天山处于洋壳俯冲—消减产生的陆缘弧环境下,大规模构造岩浆活动是前寒武系中铁元素富集的主要动力,也是形成接触交代型铁矿的主要控制因素之一。
By ^40Ar/^39Ar dating for trenolite of contact metasomatic type iron deposits in the eastern Tianshan, this paper has yielded plateau age at （387.21±0.68）Ma and isochron age at （389.65 ±1.46）Ma. Metallogenic age of this kind of iron deposits was incipiently considered to be at about 387Ma. Combined with regional tectanie backgrounds, it is proposed that the eastern Tianshan was a continental arc in the early Paleozoic which resulted from the subduetion of the paleo -ocean crust. Continental are magmatisrn was the main dynamics for iron enrichment, and also one of the dominant factors for contact metasomatie type iron deposits.
出处
《地质与勘探》
CAS
CSCD
北大核心
2006年第6期17-20,共4页
Geology and Exploration
基金
国家重点基础研究规划项目(编号:2001CB409804)资助
