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华南埃迪卡拉(震旦)系年代地层划分方案及其层型剖面

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依据华南峡东标准剖面的地球化学和多重地层划分对比资料,2014年全国地层委员会发布了埃迪卡拉(震旦)系年代地层划分暂定方案.该方案近年来已经受到来自生物地层学和同位素地质年代学研究所获得的新成果、新认识的挑战,迫切需要推出新的具体划分方案,建立新的阶一级层型剖面,作为华南乃至全国埃迪卡拉系的对比划分标准.为此,本文建议在埃迪卡拉纪以生物地层学为主确立年代地层单元的划分标准,提出在华南分别建立埃迪卡拉系上统和下统的顶阶层型剖面,即江川阶和瓮会阶.本文推荐了这两阶的相关顶、底界线层型剖面及标志化石、推测年龄和内部细分的化石带;其次初步设计了新的埃迪卡拉系、统、阶年代地层格架(地层柱),提议待定的上、下统及其余各阶名称,指明今后重点工作、细致研究的层型剖面和对比区域.
Chronostratigraphic units and its stratotype sections of the Ediacaran(Sinian)of South China
Based primarily on the geochemical and multiple stratigraphic correlation data from the standard section in the eastern Yangtze Gorges,SW China,the National Stratigraphic Commission(NSC)published a provisional division scheme of the Ediacaran(Sinian)System in 2014.In recent years,this scheme has been challenged by new achievements and understandings from studies in past and current biostratigraphy and isotope geochronology.It is thus imperative to propose a new,more precise division scheme and establish new stage-ranking stratotype sections in order to serve as the standard for future nationwide comparisons of the Ediacaran System,particularly in South China.In light of this,this paper suggests the establishment of top-stage stratotype sections of upper and lower strata for the Ediacaran Series in South China,namely the Jiangchuan Stage and the Wenghui Stage.Firstly,it recommends adopting a biogeological criterion as the primary basis for the biostratigraphic division of the Ediacaran Period.It also suggests the characteristic top and bottom boundary stratotype sections,key fossils,inferred ages,and internal subdivisions for these two stages.Secondly,a preliminary Ediacaran system-stage chronostratigraphic framework(stratigraphic column)is proposed,which includes the tentative names of subdivisions for the upper and lower series as well as other stages,thereby indicating the focus of future work and detailed investigations regarding stratotype sections and comparison regions.

Ediacaran(Sinian)Systemdivision schemestratotype sectionsJiangchuan StageWenghui Stage

陈启聪、唐烽、张恒、高林志、任留东、赵明胜、李玉兰、张立军、赵萌生、陈建书、王约、焦德光、刘军平

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中国地质科学院地质研究所,北京,100037

中国地质大学(北京)地球科学与资源学院,北京,100083

沈阳师范大学古生物学院,辽宁沈阳,110034

贵州地质工程勘察设计研究院,贵州贵阳,550081

河南理工大学资源环境学院,河南焦作,454003

中国地质调查局昆明自然资源综合调查中心,云南昆明,650100

贵州省地质调查院,贵州贵阳,550081

贵州大学资源与环境工程学院,贵州贵阳,550025

云南省玉溪师范学院,云南玉溪,650031

云南省地质调查局,云南昆明,650051

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埃迪卡拉(震旦)系 年代地层划分 层型剖面 江川阶 瓮会阶

中国地质调查局地质调查项目中国地质调查局地质调查项目国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目贵州科技项目

DD20221645DD20221648421720354194100441762001415720242017-5788

2024

10.19762/j.cnki.dizhixuebao.2023335

地质学报
中国地质学会

地质学报

CSTPCD北大核心
影响因子：2.17
ISSN：0001-5717
年,卷(期)：2024.98(6)