赖牧晨,史宇坤,鲁铮博,施玉洁,黄浩

• 1:南京大学地球科学与工程学院
• 2:江苏省卓越深时数字地球中心
• 3:中国科学院地质与地球物理研究所

摘要(Abstract)：

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。

关键词(KeyWords)： 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

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(42293280、92255301)资助

作者(Author): 赖牧晨,史宇坤,鲁铮博,施玉洁,黄浩

DOI: 10.19839/j.cnki.dcxzz.2024.0010

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