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首页> 外文期刊>Journal of Asian earth sciences >Carbon isotope chemostratigraphy and conodont biostratigraphy around the Smithian-Spathian boundary in the Panthalassan carbonate succession (SW Japan)
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Carbon isotope chemostratigraphy and conodont biostratigraphy around the Smithian-Spathian boundary in the Panthalassan carbonate succession (SW Japan)

机译：碳同位素化疗和巩膜散斯 - 斯普拉斯·碳酸盐岩散界周围的生物数据库（SW日本）

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摘要

The Tahogawa Member of the Triassic Taho Formation in Southwest Japan consists predominantly of light, dark, and brownish gray bedded limestones and contains abundant Lower to Middle Triassic conodonts. The late Smithian to early Spathian sequence of the Tahogawa Member is divided into five conodont zones, in ascending order: Novispathodus ex gr. waageni, Nv. pingdingshanensis, Nv. brevissimus, Triassospathodus symmetricus, and Tr. homeri. The Scythogondolella milleri Subzone of the Nv. ex gr. waageni Zone contains a late Smithian Anasibirites bearing ammonoid bed. The carbon isotope (delta C-13(carb)) curve for the late Smithian to early Spathian shows a rapid excursion with values increasing from similar to 0.11 parts per thousand to similar to 5.88 parts per thousand (VPDB). The rise in delta C-13(carb) starts in the upper part of the Nv. ex gr. waageni Zone and continues into the overlying Nv. pingdingshanensis Zone. The delta C-13(carb) values peak in the Nv. pingdingshanensis Zone at 5.88 parts per thousand, and subsequently decrease to 1.13 parts per thousand in the Tr. symmetricus Zone. The carbon cycle perturbation recorded in the Tahogawa Member corresponds to the late Smithian to early Spathian global carbon isotope positive and following negative excursions reported from the Tethyan, Panthalassan, and Boreal regions. The Smithian-Spathian boundary is probably located within the Nv. pingdingshanensis Zone of the Tahogawa Member, coincident with the decreasing limb of the carbon isotope perturbation. The combination of delta C-13(carb) and conodont stratigraphic data enable us to correlate between the eastern Tethys and Panthalassan regions.
机译：日本西南三叠系Taho形成的Tahogawa成员主要包括光，黑暗和棕色灰色的石灰岩，并含有丰富的中间三叠系肠道。史密斯晚期斯金斯队的初步峰会成员分为五个康塞区，按升序：Novispathodus前GR。 Waageni，NV。平顶山，NV。 Brevissimus，triassospathodus symmetricus和tr。 homeri。 NV的Scythogondolella Milleri子宫子。 ex gr。 Waageni Zone含有亚麻酸床床的后期史密斯。碳同位素（Delta C-13（碳水化合物））曲线为后期斯金思早期斯普斯显示出快速偏移，其值增加到0.11份千分之二，与5.88份（VPDB）相似。 Delta C-13（CARB）的升高在NV的上部开始。 ex gr。 Waageni区并继续进入覆盖的NV。平顶山脉区。 DELTA C-13（CARB）值在NV中峰值。 Pingdingshanensis区每千份5.88份，随后在TR中减少到每千份的1.13份。 Symmetricus区。在Tahogawa成员中记录的碳循环扰动对应于后期史密斯全球碳同位素的阳性和后期从Tethyan，Pantalassan和Boreal地区报告的阴性偏移。史密斯 - 斯普利亚边界可能位于NV内。平顶山脉区域的塔哈科群地区，与碳同位素扰动的肢体逐渐变成一致。 Delta C-13（CARB）和Conodont地层数据的组合使我们能够与东部的Thethys和Panthalassan地区之间相关联。

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