Rapid vertebrate recuperation in the Karoo Basin of South Africa following the End-Permian extinction
Rapid vertebrate recuperation in the Karoo Basin of South Africa following the End-Permian extinction
复制标题
DOI：
10.1016/j.jafrearsci.2006.04.006
复制
发表时间：
2006-08-01
影响因子：
2.3
通讯作者：
Smith, R. M. H.
中科院分区：
文献类型：
--
作者：
Botha, J.;Smith, R. M. H.
发生在二叠纪末期约251 Mya的大灭绝被广泛认为是地球历史上最具破坏性的灭绝事件：据估计，来自海洋和陆地的全球多样性的75%-90%在最多100万年内同步消失，甚至可能在短短10万年内消失。到目前为止，大多数研究都集中在海洋记录上，直到最近才发现了几个保存完好的陆相二叠系-三叠系界线层序。南非主要的卡鲁盆地拥有几个保存完好的二叠纪-三叠纪陆相界线层序，这些层序一直是对物种灭绝的性质及其可能原因进行深入研究的重点。这项研究使用了卡鲁盆地南部贝瑟利附近边界层序的沉积学和生物地层学数据，对灭绝事件后冈瓦那南部这一部分陆地动物的恢复速度和时间做出了假设。从277个现场脊椎动物化石中收集的生物地层学数据使我们能够更准确地定义几个类群的时间范围。这些数据还证实了盆地这一部分更准确的灭绝速度，即54%的最近二叠纪脊椎动物分类群，随后开始了相对快速的恢复，估计在40-5万年内(基于泛滥平原沉积速率和压实率的计算)，包括从幸存者中至少产生了12种新的脊椎动物分类群。(C)2006爱思唯尔有限公司。保留所有权利。
The mass extinction that occurred at the end of the Permian Period approximately 251 Mya is widely accepted as the most devastating extinction event in Earth's history: An estimated 75-90% of global diversity from both marine and terrestrial realms disappeared synchronously within at most one million and perhaps as little as 100,000 years. To date, most research has focused on the marine record and it is only recently that a few fully preserved terrestrial Permo-Triassic boundary sequences have been discovered. The main Karoo Basin of South Africa hosts several well-preserved non-marine Permo-Triassic boundary sequences that have been the focus of intensive research into the nature of the extinction and its possible causes. This study uses sedimentological and biostratigraphic data from boundary sequences near Bethulie in the southern Karoo Basin to make assumptions about the rates and timing of recovery of the terrestrial fauna in this portion of southern Gondwana after the extinction event. The biostratigraphic data gathered from 277 in situ vertebrate fossils allows us to define more accurately the temporal ranges of several taxa. These data also confirm a more precise extinction rate in this part of the basin of 54% of latest Permian vertebrate taxa, followed by the onset of a relatively rapid recovery, within an estimated 40-50 thousand years (based on the calculation of floodplain aggradation rates and compaction ratios) that included the origination of at least 12 new vertebrate taxa from amongst the survivors. (c) 2006 Elsevier Ltd. All rights reserved.