摘要
以岩相及相序为基础，不同级别旋回层序及其有序叠加形式为研究核心，在进行１／５万区域地质调查的同时，对河北兴隆中、上元古界旋回层序特征进行了初步研究。将厚近万米、延续时间达１０亿年左右的地层，划分为４个一级超层序、１７个二级大层序、６２个三级层序。三级层序的划分和识别建立在米级旋回层序及其有序叠加形式的基础之上。旋回性沉积记录的研究，为中、上元古界“系”的划分和建立提供了基本资料，一级超层序与银河年旋回存在成因联系。
Based on the study of lithofacies and facies successions, cyclic sequences of var ious orders and their regularly vertical stacking patterns, the middle and upper Proterozoic are studied during the 1∶50 000 regional geological survey in Xinlong, Hebei, the strata are nearly 10 000 meters thick, the time span is about 100Ma±(1 800Ma-800Ma),4 first order supersequences and 17 second order megasequences constituted by 62 third order sequences are discerned in this set of strata. The division and discerning of third order sequences are based on meter scale cyclic sequences and their regularly vertical stacking patterns. The study of cyclic records of the middle and upper Pretozoic indicates that four first order supersequences are genetically related to the cycle of galactic year, all of which provide fundamental materials for the division of “system” in the Middle and Late Pretozoic.
出处
《地层学杂志》
CSCD
北大核心
1998年第2期102-108,共7页
Journal of Stratigraphy
基金
国家重大基础攻关项目
关键词
旋回层序
上元古界
河北
中元古界
地层
cyclic sequences, Middle and Upper Pretozoic, Xinlong, Hebei
