A Review of Studies on Global Changes of Sea Level Across the Permian Triassic Boundary
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摘要: 二叠纪-三叠纪界线附近的全球海平面变化是当前沉积学研究的热点和难点问题，其与当时的显生宙最大规模生物灭绝事件存在一定关联，具有重要的研究意义。然而二叠纪-三叠纪界线附近的全球海平面变化存在较多争议，受单剖面或区域范围内相对海平面变化研究程度的制约，在缺乏从沉积学角度的综合对比研究的情况下，可能会影响对全球海平面变化过程与持续时间的判识。综述了二叠纪-三叠纪界线附近的海平面变化研究进展，整合了多位学者的研究剖面、主要观点及认识，梳理了全球海平面变化的主要观点（“上升论”和“下降-上升论”），包括其各自的发展历程、代表剖面及海平面变化识别特征、海平面上升/下降的原因以及海平面变化与生物灭绝的关系等，并在此基础上，探讨了二叠纪-三叠纪全球海平面变化研究过程中产生争议的原因。本文旨在为二叠纪-三叠纪界线（PTB）附近海平面变化研究提供线索，同时为研究全球PTB地质事件发生的背景及差异性原因提供基础证据。Abstract: The issue on sea-level changes across the Permian-Triassic boundary (PTB) has been disputed by the sedimentologists for a long time. It may also have relation with the largest mass extinction event during the transition of Permian-Triassic. However, it is not quite clear about the process and mechanism of the change of sea level in light of previous studies from local- and small-scale materials. The lack of reliable evidence from integrated perspectives would go against the identification of the process and duration of global sea-level variation. In this study, we systematically reviewed the literatures on the issue of sea-level changes during the transitions of Permian-Triassic, and summarized the main views including:(1) successive transgression, and (2) regression and following quick transgression. This study also compiled the development processes of these two different views, sedimentary features in diagnostic sections, the possible reasons of sea-level rise/fall, as well as the relationship between mass extinction and sea-level changes. Meanwhile, the causes of dispute on sea-level changes in the PTB were discussed preliminarily from available evidence. The aim of this study is to provide some clues to further recognize the process of sea-level changes during the PTB, and to provide substantial evidence to understand the background of global sea-level changes during the Permian-Triassic transition.
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