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Middle Triassic (Anisian) Conodont Biostratigraphy at the Shaiwa Section, Guizhou, South China
Journal of Earth Science ( IF 3.3 ) Pub Date : 2021-06-05 , DOI: 10.1007/s12583-021-1477-0
Binxian Qin , Martyn Lee Golding , Haishui Jiang , Yan Chen , Muhui Zhang , Li Kang , Dacheng Wang , Jinling Yuan

The Nanpanjiang Basin is a key area for paleontological and biostratigraphical study of the Middle Triassic. Herein we studied Middle Triassic conodonts from a well-exposed section, the Shaiwa Section, which is located at the northwest end of the Nanpanjiang Basin. A total of six Anisian conodont zones are recognized; in ascending order, they are: the Nicoraella germanica Zone, the Nicoraella kockeli Zone, the Paragondolella bulgarica Zone, the Neogondolella constricta Zone, the Neogondolella cornuta Zone, and the Paragondolella excelsa Zone, respectively. The first occurrence of Nicoraella kockeli defines the Bithynian-Pelsonian boundary. The Pelsonian-Illyrian boundary is defined by the first occurrence of Neogondolella constricta. The Anisian-Ladinian boundary cannot be recognized at the Shaiwa Section due to the absence of conodont indicative of the Ladinian. However, the new conodont data indicate that the uppermost strata could be very close to the boundary. The abrasion of conodont surfaces provides evidence for demonstrating reworking at the Shaiwa Section, which makes some conodonts possess a longer stratigraphic range than previously recorded. The variation in relative abundance between blade-shaped conodonts and platform conodonts indicates that segminiplanate elements probably preferred deeper and oxygenated environments whereas a restricted marine environment is more suitable for segminate elements.



中文翻译:

贵州省沙瓦剖面中三叠世(阿尼阶)牙形石生物地层学

南盘江盆地是中三叠世古生物和生物地层研究的重点区域。在此,我们研究了位于南盘江盆地西北端的一个出露良好的剖面,即沙瓦剖面的中三叠世牙形石。总共识别了六个 Anisian 牙形石带;在升序排列,他们分别是:Nicoraella德国开发区,Nicoraella kockeli开发区,Paragondolella bulgarica开发区,Neogondolella缢开发区,Neogondolella枸骨区和Paragondolella棕竹区,分别。Nicoraella kockeli的首次出现定义了 Bithynian-Pelsonian 边界。Pelsonian-Illyrian 边界由第一次出现的Neogondolella constricta 定义. 由于缺少代表拉丁尼阶的牙形石,在 Shaiwa 剖面无法识别阿尼西亚-拉丁阶边界。然而,新的牙形石数据表明,最上面的地层可能非常接近边界。牙形石表面的磨损为在 Shaiwa 剖面进行再加工提供了证据,这使得一些牙形石具有比以前记录的更长的地层范围。叶片形牙形石和平台牙形石之间相对丰度的变化表明,segminiplanate 元素可能更喜欢更深和含氧的环境,而受限制的海洋环境更适合segminiplanate 元素。

更新日期:2021-06-05
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