北京大学学报（自然科学版）2025，Vol.61Issue(4)：697-708,12.DOI:10.13209/j.0479-8023.2025.041
镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束
Constraints of Magnesium Isotope Composition on the Origin of Dolomite of Gaoyuzhuang Formation in Beipiao Area,Liaoning Province
摘要
Abstract
Petrographic analysis and elemental geochemical testing were conducted on the dolostones of Gaoyu-zhuang Formation in Beipiao area,Liaoning Province.Through petrographic and sequence stratigraphic analyses,eleven sedimentary cycles were identified within a 24-meter-thick stratigraphic section.It was found that the vertical fluctuations in magnesium isotope compositions of the dolostones broadly correspond to the subdivision of parase-quences.This indicates that the thick-bedded dolostones of Gaoyuzhuang Formation in Beipiao area were formed by the cumulative superimposition of dolomitization processes occurring during different episodes(cycles).These results validate previous hypotheses regarding the genesis of thick Cambrian dolostone successions.Furthermore,the findings demonstrate that the genetic hypothesis that thick dolostones form via the progressive superimposition of multiple dolomitization events is also applicable to Precambrian dolostones.关键词
镁同位素/高于庄组/白云岩成因/北票地区Key words
Mg isotopes/Gaoyuzhuang Formation/origin of dolomite/Beipiao area引用本文复制引用
王天宇,凌坤,魏韧,董琳..镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束[J].北京大学学报（自然科学版）,2025,61(4):697-708,12.基金项目
国家自然科学基金(41672334)资助 （41672334）
