Warming and increased aridity during the earliest Triassic in the Karoo Basin, South Africa
Warming and increased aridity during the earliest Triassic in the Karoo Basin, South Africa
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DOI：
10.1130/g38957.1
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发表时间：
2017-06-01
期刊：
影响因子：
5.8
通讯作者：
Bassett, Damon J.
中科院分区：
文献类型：
--
作者：
MacLeod, Kenneth G.;Quinton, Page C.;Bassett, Damon J.
二叠纪-三叠纪（P-T）生物大灭绝是中生代最大的生物灭绝事件，与西伯利亚圈闭（西伯利亚，俄罗斯）的喷发有因果关系，通过火山强迫温室气体排放的气候和生态影响。考虑到人类活动对大气层的影响，记录温室效应与灾难性生物后果之间联系的细节，其重要性超出了对P-T边界的更好理解。三叠纪早期的变暖得到了建模和同位素研究的支持，然而，经验数据是有限的。在本文中，我们表明，三角洲O-18值磷酸盐therapsid象牙从内部的泛大陆（古纬度60度S）是相对恒定的，通过最新的二叠纪，但增加了类似的2%，在最早的三叠纪。在同一时间段内，碳酸盐土壤结核的d18 O值增加了约5%。这两个测量值的增加和结核之间不成比例的大位移表明，盘古大陆内部在P-T边界之后立即变暖并变得更加干旱。
The Permian-Triassic (P-T) mass extinction is the largest extinction event of the Phanerozoic and has been causally related to eruption of the Siberian Traps (Siberia, Russia) through climatic and ecological effects of volcanically forced greenhouse gas emissions. Given anthropogenic changes to the atmosphere, documenting details of links between greenhouse warming and catastrophic biological consequences has significance beyond better understanding of the P-T boundary. Earliest Triassic warming is supported by modeling and isotopic studies; however, the empirical data are limited. In this paper we show that delta O-18 values of phosphate in therapsid tusks from the interior of Pangea (paleolatitude 60 degrees S) were relatively constant through the latest Permian but increased by similar to 2% during the earliest Triassic. Over the same interval, d18O values of carbonate soil nodules increased by similar to 5%. The increases in both measurements and the disproportionately large shift among nodules indicate that the interior of Pangea warmed and became markedly more arid immediately after the P-T boundary.