当前位置: X-MOL 学术Glob. Planet. Change › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Sedimentology and carbon isotope stratigraphy of the Rhaetian Hochalm section (Late Triassic, Austria)
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.gloplacha.2020.103210
Małgorzata Rizzi , Nicolas Thibault , Clemens V. Ullmann , Micha Ruhl , Troels K. Olsen , Julien Moreau , Marie-Emilie Clémence , Wolfgang Mette , Christoph Korte

Abstract The Rhaetian (~201–209 Ma, the latest stage of the Triassic) is an important time-interval for the study of environmental changes preceding the End-Triassic Mass extinction. A detailed sedimentological and chemostratigraphic study was conducted in the lower Kossen Formation at Hochalm (Austria), the type-section of the Hochalm Member (Mb). This section exposes mid-Rhaetian sediments deposited in an intraplatform shallow marine basin on the north-western margin of the Tethys. The study highlights eight apparent shallowing-upward sequences from the middle of Unit 2 to Unit 4 of the Hochalm Mb stacked within the long-term transgression that characterizes the Kossen Formation. Both the bulk carbonate and the bulk organic matter δ13C records indicate the presence of a distinct increase in carbon isotope values in the lower part of the lower Hochalm Mb. This excursion might represent a new chemostratigraphic marker that could be used for refining the Rhaetian stratigraphy and represents another important Late Triassic carbon-cycle perturbation prior to the major disturbance associated with the End Triassic biotic crisis.

中文翻译:

Rhaetian Hochalm 剖面(晚三叠世,奥地利)的沉积学和碳同位素地层学

摘要 Rhaetian(~201-209 Ma,三叠纪的最新阶段)是研究三叠纪末大灭绝前环境变化的重要时间段。详细的沉积学和化学地层研究是在 Hochalm(奥地利)的 Kossen 组下部进行的,这是 Hochalm 段 (Mb) 的类型剖面。该部分暴露了沉积在特提斯西北边缘平台内浅海盆地中的中雷蒂亚沉积物。该研究强调了从 Hochalm Mb 的单元 2 到单元 4 中间的八个明显的上浅层序,这些层序堆叠在以 Kossen 地层为特征的长期海侵中。大块碳酸盐和大块有机质 δ13C 记录都表明在较低的 Hochalm Mb 的下部存在碳同位素值的明显增加。这次偏移可能代表了一个新的化学地层标记,可用于完善雷蒂亚地层,并代表在与三叠纪末生物危机相关的主要干扰之前的另一个重要的晚三叠世碳循环扰动。
更新日期:2020-08-01
down
wechat
bug