戎嘉余,唐鹏,詹仁斌,张小乐,黄冰,魏鑫,王怿

• 1:中国科学院南京地质古生物研究所
• 2:古生物学与油气地层应用全国重点实验室
• 3:中国科学院大学

摘要(Abstract)：

认识重大生物、环境、地质事件,地层时代的确定是关键,若对比有误,定会影响对这些事件的认知与解读。浙西和赣东北上奥陶统上部岩石地层单位的时代问题便是一例。本文研究表明:(1)与上扬子区观音桥层(赫南特期)对比的文昌组,因产晚奥陶世大灭绝前的浅海暖水阿尔泰窗贝动物群(Altaethyrella Fauna),全然不见广布的浅海冷水赫南特贝动物群(Hirnantia Fauna),时代宜归于凯迪晚期;(2)以发育紫红色碎屑岩为特征的红家坞组,以往亦被归于赫南特期,但因产几丁虫Tanuchitina laurentiana、缺失赫南特贝动物群分子,时代为凯迪晚期;(3)浙皖海盆中心区域的堰口组,产Metabolograptus extraordinarius带的笔石、较深水的腕足类Aegiromenella和三叶虫Mucronaspis,宜归于赫南特早中期,层位上高于文昌组;(4)文昌组和红家坞组均以平行不整合与上覆仕阳组或安吉组接触,后两个组的底部富产华夏正形贝动物群(Cathaysiorthis Fauna),时代为赫南特晚期至鲁丹早期。赫南特早中期的生物群在文昌组和红家坞组分布区内一直没有发现,可能与华夏古陆强烈隆升、全球海平面大幅骤降密切相关。赫南特晚期至鲁丹期华夏正形贝动物群在研究区相当繁盛,主要受控于华夏古陆持续强烈隆升和全球海平面大幅速升。

关键词(KeyWords)： 奥陶系-志留系界线;晚奥陶世生物大灭绝;上奥陶统;文昌组,红家坞组,堰口组

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 戎嘉余,唐鹏,詹仁斌,张小乐,黄冰,魏鑫,王怿

DOI: 10.19839/j.cnki.dcxzz.2025.0010

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