华北自生黏土矿物指示中元古代末期浅海氧化还原条件的时空差异性  

Authigenic Clay Minerals from North China Reveal Spatiotemporal Variations in Shallow Seawater Redox Conditions during the Terminal Mesoproterozoic

作　　者：谢宝增 汤冬杰[1,2,3] 刘亚婕 杨欣囡 柯竺彤 孙龙飞 李超 王新强[1,4] 史晓颖[1,2,4] Xie Baozeng;Tang Dongjie;Liu Yajie;Yang Xinnan;Ke Zhutong;Sun Longfei;Li Chao;Wang Xinqiang;Shi Xiaoying(State Key Laboratory of Geomicrobiology and Environmental Changes,China University of Geosciences(Beijing),Beijing 100083,China;Frontiers Science Center for Deep-Time Digital Earth,China University of Geosciences(Beijing),Beijing 100083,China;Institute of Earth Sciences,China University of Geosciences(Beijing),Beijing 100083,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;National Research Center for Geoanalysis,Beijing 100037,China)

机构地区：[1]中国地质大学(北京)地质微生物与环境全国重点实验室,北京100083 [2]中国地质大学(北京)深时数字地球前沿科学中心,北京100083 [3]中国地质大学(北京)科学研究院,北京100083 [4]中国地质大学(北京)地球科学与资源学院,北京100083 [5]国家地质实验测试中心,北京100037

出　　处：《地球科学》2025年第3期1066-1081,共16页Earth Science

基　　金：国家自然科学基金重点项目(No.41930320).

摘　　要：为了重建中元古代末期冠群真核生物快速演化的环境背景,以华北4条剖面的长龙山组碎屑岩为研究对象,开展了沉积学和矿物学分析.结果表明,怀来剖面深-浅潮下带细-粗砂岩中的黏土矿物以鲕绿泥石为主,指示缺氧铁化的海水环境;而深潮下带粉砂质泥岩-泥质粉砂岩中以海绿石为主,反映次氧化的海水条件.门头沟剖面浅潮下带中-粗砂岩中的黏土矿物以鲕绿泥石为主,指示缺氧铁化的海水条件;蓟县和卢龙剖面深潮下带砂岩中的黏土矿物则以海绿石为主,表明次氧化的环境条件.这些结果揭示,长龙山组沉积期华北浅海的氧化还原条件存在显著的时空差异,增氧促进了龙凤山藻的出现,但氧化水体分布的时空不连续性限制了它们的持续演化与广泛分布.This study investigates the environmental context for the rapid evolution of crown-group eukaryotes during the Late Mesoproterozoic,focusing on sedimentological and mineralogical analyses of clastic rocks from the Changlongshan Formation across four sections of the North China Craton.In the Huailai section,fine-to-coarse sandstones from the deepto-shallow subtidal zones are dominated by chamosite,indicating an anoxic,ferruginous marine environment.Conversely,glauconite dominates silty mudstone and muddy siltstone in the deep subtidal zone,reflecting suboxic conditions.In the Mentougou section,medium-to-coarse sandstones from the shallow subtidal zone are rich in chamosite,suggesting persistent anoxic,ferruginous conditions.In the Jixian and Lulong sections,deep subtidal zone sandstones are dominated by glauconite,indicative of suboxic environments.These results reveal pronounced spatiotemporal variations in redox conditions across the shallow seas of North China during the deposition of the Changlongshan Formation.While oxygenation facilitated the emergence of Longfengshania algae,the spatiotemporal discontinuity in the distribution of oxic water bodies may have limited the sustained evolution and widespread distribution of eukaryotes.

关 键 词：长龙山组 海绿石 鲕绿泥石 氧化还原环境 空间差异性 冠群真核生物 沉积学 矿物学 

分 类 号：P534.3[天文地球—古生物学与地层学]