构建生物地层复合序列的两种定量方法:以华南石炭纪生物地层为例  

TWO QUANTITATIVE METHODS FOR CONSTRUCTING BIOSTRATIGRAPHIC COMPOSITE SEQUENCE:A CASE STUDY OF CARBONIFEROUS BIOSTRATIGRAPHY IN SOUTH CHINA

作　　者：赖牧晨 史宇坤[1,2] 鲁铮博 施玉洁 黄浩 LAI Mu Chen;SHI Yu Kun;LU Zheng Bo;SHI Yu Jie;HUANG Hao(School of Earth Science and Engineering,Nanjing University,Nanjing 210023;Jiangsu Deep-time Digital Earth Research Center for Excellence,Suzhou 215004;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029)

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]江苏省卓越深时数字地球中心,江苏苏州215004 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《地层学杂志》2024年第2期172-182,共11页Journal of Stratigraphy

基　　金：国家自然科学基金(42293280、92255301)资助。

摘　　要：构建全球或区域内统一、可作为对比标准的生物地层复合序列,是生物地层学的重要目标。传统方法中多采用定性或半定量评估,以主干剖面为基础,辅以其他剖面上的化石产出关系建立序列,而基于大量地层剖面数据进行综合排序的定量地层学方法,可以对此进行分析、验证和补充。本文介绍了两种定量地层学方法,排序与缩放法(RASC)及约束最优化法(CONOP),针对中国石炭纪地层框架中的(虫筳)类和牙形刺化石序列进行研究。文中汇编了华南25条以牙形刺和(虫筳)类化石为主的海相剖面,分别使用这两种方法对其中的生物事件进行定量排序,获得的结果序列与根据定性经验构建的中国石炭纪(虫筳)类和牙形刺化石序列进行比较。结果表明,RASC和CONOP定量结果序列的共有事件排序相似,Spearman秩相关系数ρ值达0.9826,且与经验序列的相似度也均大于0.97。RASC和CONOP的结果序列存在差异是由不同的排序理念、排序过程中主要依据的事件关系及数据集特点导致。两种定量方法得到的结果序列与经验序列的差异,在于经验序列主要依据主干剖面中化石事件的直接共存关系排序,而定量排序则会综合多个剖面中的所有生物事件的叠覆关系进行。两种思路所得到的复合序列,可根据实际情况进行综合分析后使用,从而提高复合序列应用的广泛性。One of the important goals of biostratigraphy is to construct a global or regional biostratigraphic composite sequence that can be used as the reference of correlation.The traditional method to construct the composite sequence is to evaluate the sequences qualitatively and empirically based on a few main sections,while the quantitative stratigraphy methods provide a routine to analyze and compile fossil taxa from a large number of stratigraphic sections and construct a more widely adapted composite sequence.In this paper,two quantitative stratigraphic methods,Ranking and Scaling(RASC)and Constrained Optimization(CONOP),are introduced to a study on the fusulinid and conodont bioevent sequences in the Carboniferous stratigraphic framework of China.Altogether,25 marine sections dominated by conodont and fusulinid fossils from South China were compiled.RASC and CONOP were applied to the datasets to quantitatively evaluate the observed records for the first occurrence datum of all the fossils,and establish the result sequences.The result sequences were compared with the empirical sequence of Carboniferous conodonts and fusulinids of China.The results show that for the sharing bioevents,the RASC and CONOP result sequences present very high correlation,with a high Spearman’s correlation coefficient(ρ)value of 0.9826.Theρvalues between the two result sequences and the empirical sequence are also high,both higher than 0.97.The causes for the differences between RASC and CONOP result sequences lie on three main aspects:the different superposition philosophies,the bioevent relations they mainly based on,and the influence from the dataset.The reason for the differences between the quantitative result sequences and the empirical sequence is that the empirical sequence focuses more on the direct relations of fossils on the main sections,while the quantitative sequences synthesize all the relations in usually a large number of sections.The composite sequence obtained by both qualitative and quantitative methods need to be d

关 键 词：定量地层学 排序与缩放法 约束最优化法 标准化石 牙形刺 (虫筳) 华南 

分 类 号：P534.45[天文地球—古生物学与地层学]