Palaeotethys seawater temperature rise and an intensified hydrological cycle following the end-Permian mass extinction
Palaeotethys seawater temperature rise and an intensified hydrological cycle following the end-Permian mass extinction
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DOI：
10.1016/j.gr.2013.07.019
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发表时间：
2014-09
影响因子：
6.1
通讯作者：
Martin Schobben;M. Joachimski;D. Korn;L. Leda;C. Korte
中科院分区：
文献类型：
--
作者：
Martin Schobben;M. Joachimski;D. Korn;L. Leda;C. Korte
二叠纪末的大规模灭绝与严重的全球变暖有关。西伯利亚圈闭的主要阶段火山作用发生在或接近灭绝间隔期，并被认为是一种可能的温室催化剂。在这项研究中，一个高分辨率的δ 18 O记录建立了地层约束良好的二叠纪-三叠纪（P-Tr）边界序列的牙形石和腕足动物的低镁方解石的抗成岩磷灰石。本文对中国南方牙形石δ 18 O值进行了新的评价，并对伊朗乌恰坪阶至格里斯巴赫阶剖面的古温度进行了修正。来自伊朗P-Tr剖面的δ 18 O数据记录了长兴期热带海表温度（SST）为27-33 °C，从灭绝层开始，δ 18 O出现负移，导致SST变暖至35 °C以上。计算结果与重新计算的华南断面海温值一致。气候变暖与水文循环增强有关，包括特提斯海热带降水和季风活动的增加。全球变暖、水文循环和相关过程的加剧、垂直水柱分层、富营养化和随后的局部缺氧都可能促进了灭绝事件。
The end-Permian mass extinction has been associated with severe global warming. Main stage volcanism of the Siberian Traps occurred at or near the extinction interval and has been proposed as a likely greenhouse catalyst. In this study, a high-resolution δ18O record is established using diagenetically resistant apatite of conodonts and low-Mg calcite of brachiopods from stratigraphically well-constrained Permian–Triassic (P–Tr) boundary successions in northwestern Iran. A new evaluation is made for previously published conodont δ18O values from South China and revised palaeotemperatures are presented together with new data from Wuchiapingian to Griesbachian sections in Iran. δ18O data from P–Tr sections in Iran document tropical sea surface temperatures (SST) of 27–33 °C during the Changhsingian with a negative shift in δ18O starting at the extinction horizon, translating into a warming of SSTs to over 35 °C. The results are consistent with re-calculated SSTs of the South Chinese sections. Warming was associated with an enhanced hydrological cycle involving increased tropical precipitation and monsoonal activity in the Tethys Sea. Global warming, intensification of the hydrological cycle and associated processes, vertical water column stratification, eutrophication and subsequent local anoxia may all have facilitated an extinction event.