辽宁鞍本—抚顺地区新太古代含铁建造层位对比及形成时代讨论  

DISCUSSION ON ARCHAEAN IRON FORMAITON STRATA COMPARISON AND ITS FORMING ERA IN ANSHAN—BENXI—FUSHUN AREA OF LIAONING

作　　者：卢崇海 张耀华 奚锐 李季 关树野 张爽 邢德和[2] 谢鑫竹 

机构地区：[1]辽宁省矿产勘查院,辽宁沈阳110031 [2]沈阳地质矿产研究所,辽宁沈阳110034

出　　处：《化工矿产地质》2013年第4期193-200,共8页Geology of Chemical Minerals

摘　　要：辽宁鞍和—抚顺地区太古宙变质层状岩系，前人分别建立了太古宙鞍山群井家沟组、石棚子组、通什村组、红透山组、樱桃园组、大峪沟组和茨沟组等地层单位，这些地层单位均呈规模大小不等的包体状、孤岛状等形态赋存于太古宙变质深成岩中，各组之间大部分孤立存在，无底无顶，相互间接触关系不清，是否属于同一时期形成的产物，长期一来存在着较多的争议。通过对各岩组原岩恢复、层序对比、含铁建造、变质作用等特点和以往及近期获得高精度测年数据的分析研究，把辽宁鞍本—抚顺地区太古宙层状岩系厘定为新太古代井家沟岩组、红透山岩组、茨沟岩组和缨桃园岩组等四个构造岩石地层单位，形成时间在27～25亿a左右，为新太古代中晚期产物。In the Archaean metaporphic layering rock series in Liaoning Anshan-Benxi-Fushtm area, many lithostratigraphic units have been established including Archaean Anshan group Jingjiagou group, Shipengzi group, Tongshicun group, Hongtoushan group, Yingtaoyuan group, Dayugou group and Cigou group, ets. However, many enclaves and island-shaped litbostratigraphic units of various sizes exist in Archaean metamorphic plutonic rocks. They exist m isolation, with no bottom and cap, no clear contact area. There has been existing many controversies about whether they belong to the same period of products. Through restoration of original rocks, sequence comparison to every group, iron formation characters and research on high precision dating data obtained in recent and the past years, this article sets four lithostratigraphic units in the Archaean metaporphic layering rock series in Liaoning Anshan-Benxi-Fushun area, which are Neoarchaean Jingjiagou group, Hongtoushan group, Cigou group and Yingtaoyuan group. The forming time is 2.7--2.5 billion years ago, which belongs to late--mid-Neoarchaean neriod.

关 键 词：鞍本—抚顺 含铁建造 层序对比 形成时代 构造岩石单位厘定 

分 类 号：P618.31[天文地球—矿床学]