摘要
早前寒武纪的条带状铁建造在冀东地区广泛分布,它们的成因和形成时代一直存有争议。报道了冀东地区的王寺峪铁矿围岩黑云斜长片麻岩的锆石U-Pb定年结果。王寺峪铁矿是典型的条带状铁建造(BIF)铁矿,其矿体呈透镜体产出于黑云斜长片麻岩之中或与黑云斜长片麻岩互层产出,二者紧密伴生。对黑云斜长片麻岩的锆石LA-ICP-MS U-Pb定年结果显示其加权平均年龄为2516Ma±9Ma,解释为其成岩年龄,同时也是BIF铁矿的形成年龄。王寺峪BIF铁矿和冀东地区其它BIF铁矿共同指示了华北克拉通新太古代末期一次重要的BIF成矿事件。
Early Precambrian banded iron formations （BIFs） are widely distributed in the eastern Hebei Province and their genesis and formation ages were controversial. This paper reported the zircon U-Pb age of the host rocks of the Wangsiyu iron deposit. Wangsiyu iron deposit is a typical BIF-type iron deposit in easten Hebei Province. The iron ores occurred as lens in their host rock plagioclase- hornblende gneisses or were interlayered with plagioclase-hornblende gneisses, indicating that these two lithologies are temporally closely associated. A mean age of 2516Ma±9Ma was captured in the zircons from the plagioclase-homblende gneisses by LA-ICP- MS and it is interpreted the formation age of the gneisses, also standing for the formation age the BIF. The Wangsiyu BIF associated with other BIFs in the easten Hebei Province represent a Neoarehean rnetallogenic event of BIF widely developed in the North China Craton.
出处
《地质通报》
CAS
CSCD
北大核心
2013年第2期260-266,共7页
Geological Bulletin of China
基金
中国地质调查局项目<兴蒙造山带基本构造格局综合调查和研究>(编号:1212011085476)
<中国主要陆块晚前寒武纪以来裂解重现过程的再造及其对成矿作用的制约>(编号:1212011121064)
