Roadian-Wordian (Middle Permian) Conodont Biostratigraphy, Sedimentary Facies and Paleotemperature Evolution at the Shuixiakou Section, Xikou Area, Southeastern Qinling Region, China

• 作者: Baojin Wu Hanxiao Li Michael M.Joachimski Paul B.Wignall Haishui Jiang Jiaxin Yan Lina Wang Xianlang Wu Xulong Lai
• 来源期刊: 地球科学学刊（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 534-553
• 页数: 20页
• 语种: 英文

摘要

Focusing on the Shuixiakou Section (Xikou area, Zhen'an County, Shaanxi Province, southeastern Qinling region, China), the Roadian-Wordian conodonts are investigated. More than 2000 conodont elements including 6 genera and 14 species have been obtained. Based on these materials, the Guadalupian Jinogondolella nankingensis and J. aserrata zones have been recognized. The Roadian- Wordian boundary is tentatively defined by the first occurrence of J. aserrata in the lower part of Unit Ⅲ in the Shuixiakou Formation. The sedimentary succession of Xikou area records similar sea-level changes to those observed in Laibin area (South China). The 40 m-thick bioclastic limestone of Unit IV in this sec- tion can be correlated with the reefs of Bed 114 in Laibin area. A temperature drop indicated by δ18Oapatite values suggests this Wordian interval coincides with a period of glaciation and global regression.