Late Kungurian Conodonts of Pelagic Panthalassa from Seamount-Capping Limestone in Ogama, Kuzuu, Tochigi Prefecture, Japan
Late Kungurian Conodonts of Pelagic Panthalassa from Seamount-Capping Limestone in Ogama, Kuzuu, Tochigi Prefecture, Japan
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DOI：
10.2517/2020pr012
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发表时间：
2021-04
影响因子：
0.9
通讯作者：
Shun Muto;Yohoko Okumura;Takeshi Mizuhara
中科院分区：
文献类型：
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作者：
Shun Muto;Yohoko Okumura;Takeshi Mizuhara
抽象的。牙形刺生物地层学被广泛应用于二叠纪地层的年代划分。本文报道了潘塔拉萨远洋海山上沉积的Nabeama组石灰岩中的牙形刺，与其他海洋领域相比，这里的二叠纪牙形刺数据很少。在Nabeama组下部采集的样品中发现了Mesogondolella idahosis(Young quist、Hawley和Miller)和Sweetognus hanzhongensis(Wang)，表明其时代为昆古尔期晚期。以往的研究和本研究中获得的丝虫类表明，所研究的样品属于副褐藻雅贝生物区。因此，Parafusulina雅北带包括最上层的昆古尔期。中圆藻和汉中甜菊分别被认为是冷水和暖水物种。因此，在晚昆古尔世，冷水和暖水牙形刺物种的分布可能在远洋泛海重叠分布。
Abstract. Biostratigraphy of conodonts is widely used for age assignment of Permian strata. In this paper, we report conodonts from the limestone of the Nabeyama Formation deposited on a pelagic seamount in Panthalassa, which is an oceanic realm where Permian conodont data are scarce compared to other oceanic realms. Samples collected from the lower part of the Nabeyama Formation yielded Mesogondolella idahoensis (Youngquist, Hawley and Miller) and Sweetognathus hanzhongensis (Wang), which indicate a late Kungurian age. Previous studies and fusulinids obtained in this study indicate that the studied samples belong to the Parafusulina yabei biozone. Therefore, the Parafusulina yabei Zone includes the uppermost Kungurian. Mesogondolella idahoensis and Sweetognathus hanzhongensis are respectively regarded as cool and warm water species. Hence, the distribution of cool and warm water conodont species may have overlapped in pelagic Panthalassa during the late Kungurian.