Conodont faunas across the Kasimovian-Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage
Conodont faunas across the Kasimovian-Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage
复制标题
华南卡西莫夫-格哲利安边界（宾夕法尼亚晚期）牙形刺动物群及其对全球格哲利阶底部层型选择的影响
DOI：
10.1002/spp2.1301
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发表时间：
2020
影响因子：
2.3
通讯作者：
Xiangdong Wang
中科院分区：
文献类型：
--
作者：
Yuping Qi;James E. Barrick;Nicholas J. Hogancamp;Jitao Chen;Keyi Hu;Qiulai Wang;Xiangdong Wang
上宾夕法尼亚阶的那庆和那饶碳酸盐岩序列沉积在中国南方贵州的卡西莫阶-格哲阶边界的台地内斜坡-盆地环境中。牙形刺动物群由Idiognathodus luodianensis群的特有种和I. simulator群的世界性种混合而成。罗甸I.组包括新种：凤亭I.、罗甸I.、纳青I.和那绕I.。在平台地标分析中，罗甸冬青组的物种在形态特征上与模拟冬青组的共存物种不同。这两个群体显示出类似的增加不对称的P1元素对跨Kasimovian-Gzhelian边界，作为承认的基础上的第一次出现的I. simulator。许多KasimovianIdiognathodus种消失，几个Gzhelian种首次出现，包括两个新种：S. nemyrovskae和S. zhihaoi。就在Gzhelian底部之下，碳酸盐δ 13 C福尔斯在两个剖面中从4‰下降到2‰。在显著的负δ 13 C漂移之上的动物群突然更替的组合可能代表了华南的海洋事件，也许在全球范围内是可识别的。这两个华南段之一可能是GSSP的最佳位置，Gzhelian阶的基础。
The upper Pennsylvanian Naqing and Narao carbonate successions were deposited in intra‐platform slope‐to‐basinal settings across the Kasimovian–Gzhelian boundary in Guizhou, South China. Conodont faunas consist of a mixture of the endemic taxa of theIdiognathodus luodianensisgroup and cosmopolitan species of theI. simulatorgroup. TheI. luodianensisgroup includes the new speciesI. fengtingensis,I. luodianensis,I. naqingensisandI. naraoensis. On platform landmark analysis the species of theI. luodianensisgroup differ in morphological features from co‐occurring species of theI. simulatorgroup. Both groups display similar increasing asymmetry in P1element pairs across the Kasimovian–Gzhelian boundary, as recognized on the basis of the first occurrence ofI. simulator. Many KasimovianIdiognathodusspecies disappear and several Gzhelian species first appear withI. simulator, including two new species ofStreptognathodus:S.nemyrovskaeandS.zhihaoi. Just below the base of the Gzhelian, carbonate δ13C falls from 4‰ to 2‰ in both sections. The combination of an abrupt faunal turnover immediately above the prominent negative δ13C excursion might represent an oceanic event in South China, perhaps recognizable on a global scale. One of these two South China sections may be the best location to place the GSSP for the base of the Gzhelian Stage.