Late Eocene signals of oncoming Icehouse conditions and changing ocean circulation, Antarctica
Late Eocene signals of oncoming Icehouse conditions and changing ocean circulation, Antarctica
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南极洲始新世晚期即将到来的冰室条件和海洋环流变化的信号
DOI：
10.1016/j.epsl.2022.117885
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发表时间：
2022
影响因子：
5.3
通讯作者：
R. Larter
中科院分区：
文献类型：
--
作者：
Xiaoxia Huang;R. Steel;R. Larter
始新世温室世界的结束是长期新生代冷却趋势中最引人注目的阶段。在这里，我们使用75,000公里的多/单道地震反射数据从海上Prenchez湾，南极洲，提供新的见解古近纪地层从温室到冰库条件的过渡和重组的海洋环流的变化，由冷却和冰川作用。我们确定了一个新的显着的古近纪过渡阶段（温室冰室）保存在深水沉积记录从陆棚到大陆坡的相关。在过渡的早期阶段，大陆坡上出现了巨型物质搬运沉积物，这表明大陆边上部存在着严重的不稳定和崩塌。过渡的第二阶段是一组界限明确的大陆坡斜坡的增长。我们估计，MTDs和斜坡的形成时代为始新世-渐新世过渡。在过渡阶段形成的斜坡形表明海平面已经上升，大量的沉积物被输送到边缘的海洋终止冰川的架子上。最后，一个随后的显着迁移的边缘沉积中心向西和西北，证明了漂移沉积和完整的冰川条件的开始，这表明一个更有力的海洋环流，因为地球进入冰库条件后，始新世-渐新世边界。
The end of the Eocene greenhouse world was the most dramatic phase in the long-term Cenozoic cooling trend. Here we use 75,000 km of multi/single channel seismic reflection data from offshore Prydz Bay, Antarctica, to provide new insight on the Paleogene stratigraphic transition from greenhouse to icehouse conditions and reorganizing the ocean circulation changes that were invigorated by the cooling and glaciation. We identify a new prominent Paleogene transitional phase (Greenhouse to Icehouse) preserved in the deep-water sedimentary record by correlating from shelf to the continental slope. The occurrence of mega-Mass Transport Deposits (MTDs) on the slope during an early stage in the transition suggests significant instability and collapse of the upper part of the continental margin. A second stage of the transition is represented by the growth of a well-defined set of continental slope clinoforms. We estimate the formation age of the MTDs and clinoforms to be around Eocene-Oligocene Transition. The formation of the clinoforms in the transitional phase indicates sea level has risen, and large volumes sediment delivered to the margin by marine-terminating glaciers on the shelf. Finally, a subsequent marked migration of the margin depocenter toward the west and northwest, attests the onset of drift sedimentation and full glacial conditions, suggesting a more vigorous ocean circulation as the Earth entered the icehouse conditions after the Eocene-Oligocene boundary.
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影响因子：
18.3
作者：
P. Stocchi;C. Escutia;A. Houben;B. Vermeersen;P. Bijl;H. Brinkhuis;R. DeConto;S. Galeotti;S. Passchier;D. Pollard;A. Klaus;Annick Fehr;T. Williams;J. Bendle;S. Bohaty;S. Carr;R. Dunbar;J. Flores;J. Gonzàlez;T. Hayden;M. Iwai;F. Jiménez-Espejo;K. Katsuki;G. Kong;R. McKay;M. Nakai;M. Olney;S. Pekar;J. Pross;C. Riesselman;U. Röhl;T. Sakai;P. Shrivastava;C. Stickley;S. Sugisaki;L. Tauxe;S. Tuo;T. Flierdt;K. Welsh;M. Yamane
通讯作者：
P. Stocchi;C. Escutia;A. Houben;B. Vermeersen;P. Bijl;H. Brinkhuis;R. DeConto;S. Galeotti;S. Passchier;D. Pollard;A. Klaus;Annick Fehr;T. Williams;J. Bendle;S. Bohaty;S. Carr;R. Dunbar;J. Flores;J. Gonzàlez;T. Hayden;M. Iwai;F. Jiménez-Espejo;K. Katsuki;G. Kong;R. McKay;M. Nakai;M. Olney;S. Pekar;J. Pross;C. Riesselman;U. Röhl;T. Sakai;P. Shrivastava;C. Stickley;S. Sugisaki;L. Tauxe;S. Tuo;T. Flierdt;K. Welsh;M. Yamane
始新世-渐新世过渡阶段冰逐步生长的南极地层记录
影响因子：
4.9
作者：
Passchier S
通讯作者：
Passchier S
中新世将呈现斯科舍海和南极冰盖动力学的海洋学变化：IODP第382次远征后修订的地震地层学的见解
影响因子：
5.3
作者：
Pérez L
通讯作者：
Pérez L
影响因子：
5.8
作者：
Lear, Caroline H.;Bailey, Trevor R.;Rosenthal, Yair
通讯作者：
Rosenthal, Yair