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A volcanic tuff near the Carboniferous–Permian boundary, Taiyuan Formation, North China: Radioisotopic dating and global correlation
Review of Palaeobotany and Palynology ( IF 1.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.revpalbo.2020.104244
Mark D. Schmitz , Hermann W. Pfefferkorn , Shu-Zhong Shen , Jun Wang

Abstract A 66 cm thick volcanic ash fall tuff occurring within a thick coal deposit and containing a paleobotanical fossil lagerstatte in the Wuda coal district of North China has been dated as 298.34 ± 0.09 Ma. The fossil flora in the tuff indicates a latest Carboniferous to earliest Permian age and is thus in agreement with the radioisotopic age of earliest Permian, Asselian, age. This bed supplies a well-defined position of the Carboniferous–Permian boundary near the northern edge of the North China Block. The tuff occurs in the top of the Taiyuan Formation and several meters below the base of the Shansi (= Shanxi) Formation. These beds were traditionally considered late Carboniferous to early Permian in age. Our results demonstrate that the Taiyuan Formation is time transgressive and its age has to be revised for the northern part of the North China Block.

中文翻译:

华北太原组石炭-二叠系边界附近的火山凝灰岩:放射性同位素测年和全球相关性

摘要 华北乌达煤区一处厚煤层中发现的66 cm厚火山灰坠落凝灰岩,其中含有古植物化石lagerstatte,年代为298.34±0.09 Ma。凝灰岩中的化石植物群表明最晚的石炭纪到最早的二叠纪时代,因此与最早的二叠纪阿瑟阶的放射性同位素年龄一致。该层为华北地块北缘附近的石炭系-二叠系边界提供了明确的位置。凝灰岩出现在太原组的顶部和山西(= 山西)组底部以下几米处。这些地层传统上被认为是晚石炭世到早二叠世。
更新日期:2020-04-01
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