Relative sea-level rise around East Antarctica during Oligocene glaciation
Relative sea-level rise around East Antarctica during Oligocene glaciation
复制标题
DOI：
10.1038/ngeo1783
复制
发表时间：
2013-05
影响因子：
18.3
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
中科院分区：
文献类型：
--
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
在始新世中晚期(∼48-34 Myr ago)，地球气候变冷，南极洲形成冰盖。南极洲冰层的逐步膨胀，导致大陆周围的地壳形变和重力扰动。在冰盖附近，海平面上升，尽管水向冰盖转移导致海洋质量总体下降。在这里，我们通过强迫冰川-水力均衡调整模型和南极冰盖模型来确定地壳对冰盖增长的响应。我们发现，随着上地幔物质的上涌和外围前隆起的发展，东南极周围的陆架区首先出现浅滩。随着岩石圈挠曲从冰盖边缘向外延伸，内陆架随后下沉。因此，沿海地区经历了相对海平面的逐步上升。我们对南极冰盖附近沉积岩芯的分析与我们的模拟所显示的相对海平面变化的空间模式是一致的。我们的结果与诸如局部海平面变化等近场过程影响冰盖接地线的平衡态的说法是一致的。
During the middle and late Eocene (∼ 48–34 Myr ago), the Earth’s climate cooled,and an ice sheet built up on Antarctica. The stepwise expansion of ice on Antarctica,induced crustal deformation and gravitational perturbations around the continent. Close to the ice sheet, sea level rose,despite an overall reduction in the mass of the ocean caused by the transfer of water to the ice sheet. Here we identify the crustal response to ice-sheet growth by forcing a glacial-hydro isostatic adjustment model with an Antarctic ice-sheet model. We find that the shelf areas around East Antarctica first shoaled as upper mantle material upwelled and a peripheral forebulge developed. The inner shelf subsequently subsided as lithosphere flexure extended outwards from the ice-sheet margins. Consequently the coasts experienced a progressive relative sea-level rise. Our analysis of sediment cores from the vicinity of the Antarctic ice sheet are in agreement with the spatial patterns of relative sea-level change indicated by our simulations. Our results are consistent with the suggestion that near-field processes such as local sea-level change influence the equilibrium state obtained by an ice-sheet grounding line.