古地理学报2018，Vol.20Issue(3)：453-464,12.DOI:10.7605/gdlxb.2018.03.033
叠层石中的海绿石化和黄铁矿化:以天津蓟县中元古界铁岭组为例
Glauconitization and pyritization of stromatolites: A case of the Mesoproterozoic Tieling Formation at Jixian section, Tianjin, North China
摘要
Abstract
As the main type of microbial carbonates,it has become the consensus that stromatolites are mainly constructed by microbial mats.The stromatolitic bioherm of the Second Member of the Tieling Formation in Jixian section,Tianjin,are made of fine-grained stromatolites,interpreted as a microbial structure formed by trapping carbonate muds on microbial mats;they are different from the modern stromatolites and most of the Phanerozoic stromatolites.Particularly,the glauconite and pyrite preserved in the stromatolites represent two types of special mineralization.As a result of sulfate-reducing bacteria,pyrite commonly produced in the study area,is a window to understand the ancient microorganisms.Glauconite that is developed in the high-energy shallow sea is different from the modern glauconite in the production environment;it may not be used as the indicator mineral of the slow depositional rate,nor has the geological significance of sedimentary discontinuity.The two types of mineralization directly suggest that the Tieling stromatolites are formed by precipitation,rather than the capture of carbonate muds.This study provides some useful clues for understanding the characteristics and formation of the Mesoproterozoic stromatolites.关键词
海绿石化/黄铁矿化/叠层石/铁岭组/蓟县剖面Key words
glauconitization/pyritization/stromatolite/Tieling Formation/Jixian section分类
天文与地球科学引用本文复制引用
梅朝佳..叠层石中的海绿石化和黄铁矿化:以天津蓟县中元古界铁岭组为例[J].古地理学报,2018,20(3):453-464,12.基金项目
国家自然科学基金项目(编号:41472090,40472065)资助.[Financially supported by the National Natural Science Foundation of China (Nos.41472090,40472065)] （编号:41472090,40472065）
