“金钉子”之后的国际年代地层表刍议  

Attempting discussion of the International Chronostratigraphic Chart after the Global Standard Boundary Stratotype Section and Point

作　　者：王训练[1] Xunlian Wang(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《科学通报》2022年第3期307-320,共14页Chinese Science Bulletin

基　　金：国家自然科学基金(42172037,41702023)资助。

摘　　要：国际年代地层表是地质学研究的一个纲领性文献,为地质学研究提供了时间格架,对现代地质学的诞生和发展作出了重要贡献.关于用生物标志还是用事件标志定义年代地层界线的争议由来已久.20世纪70年代以前主要以"自然事件"作为年代地层单位的划分依据,界线一般都选择在发生某些地质事件的位置上,即"自然界线"或"发生过事件"的界线[1,2].这种方法注重自然界线,重视各类地层单位之间的普遍联系和统一性.其不足之处在于忽视了事物普遍联系的多样性和不同类型地层单元界线之间的本质差别,忽视了一些地质事件发生非等时性、分布的区域性和表现的多样性,不恰当地用代表时间间断的沉积不连续面等自然界线定义年代地层界线,使年代地层界线和地质年代表无法稳定,因而受到后来许多学者的强烈反对.To date,approximately two-thirds of the Phanerozoic chronostratigraphic boundaries have been defined in terms of the Global Standard Boundary Stratotype Section and Point(GSSP)concept in the International Chronostratigraphic Chart.However,in practice,almost all definitions and correlations of these boundaries are controversial,and some of the definitions are indeed questionable.Consequently,the definitions of some boundaries for the standard of correlation become almost meaningless,and it is therefore necessary to reexamine the guiding ideology and research methods for determining stratigraphic boundaries.In addition,the current International Chronostratigraphic Chart is no longer able to meet the need for accuracy of the temporal and spatial framework for Earth system science.Therefore,it is necessary to establish a new generation of the International Chronostratigraphic Chart after the GSSP.Given the problems encountered in the establishment and practice of the International Chronostratigraphic Chart,this paper proposes that the International Chronostratigraphic Chart after the GSSP should be developed to solve the following issues:(1)Improving the time resolution;(2)improving the identifiability of stratigraphic boundaries;(3)improving the isochronism of stratigraphic boundaries;(4)establishing a standard for chronostratigraphic boundaries that is suitable for accurate correlation of different sedimentary facies in different regions;(5)establishing objective,repeatable,and verifiable criteria for the definition and selection of GSSPs;and(6)ensuring that the chronostratigraphic boundaries reflect the historical stages of the evolution of Earth.The present paper attempts to combine biostratigraphy and event stratigraphy to define chronostratigraphic boundaries,and takes the geological event surface as an important criterion for defining,selecting,and identifying GSSPs.In the specific approach,the speciation event of the first widely distributed species above the top surface of the event stratigraphic unit,that i

关 键 词：地质年代表 年代地层单位 事件标志 地质学研究 普遍联系 不连续面 自然界线 生物标志 

分 类 号：P534[天文地球—古生物学与地层学]