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来自新西兰浅海沉积物记录对上新世中期(360 - 240万年前)海平面波动幅度的限制。

Constraints on the amplitude of Mid-Pliocene (3.6-2.4Ma) eustatic sea-level fluctuations from the New Zealand shallow-marine sediment record.

作者信息

Naish Tim R, Wilson Gary S

机构信息

Antarctic Research Centre, Victoria University of Wellington,Wellington 6140, New Zealand.

出版信息

Philos Trans A Math Phys Eng Sci. 2009 Jan 13;367(1886):169-87. doi: 10.1098/rsta.2008.0223.

Abstract

Ice-volume calibrations of the deep-ocean foraminiferal delta18O record imply orbitally influenced sea-level fluctuations of up to 30m amplitude during the Mid-Pliocene, and up to 30 per cent loss of the present-day mass of the East Antarctic Ice Sheet (EAIS) assuming complete deglaciation of the West Antarctic Ice Sheet (WAIS) and Greenland. These sea-level oscillations have driven recurrent transgressions and regressions across the world's continental shelves. Wanganui Basin, New Zealand, contains the most complete shallow-marine Late Neogene stratigraphic record in the form of a continuous cyclostratigraphy representing every 41 and 100ka sea-level cycle since ca 3.6Ma. This paper presents a synthesis of faunally derived palaeobathymetric data for shallow-marine sedimentary cycles corresponding to marine isotope stages M2-100 (ca 3.4-2.4Ma). Our approach estimates the eustatic sea-level contribution to the palaeobathymetry curve by placing constraints on total subsidence and decompacted sediment accumulation. The sea-level estimates are consistent with those from delta18O curves and numerical ice sheet models, and imply a significant sensitivity of the WAIS and the coastal margins of the EAIS to orbital oscillations in insolation during the Mid-Pliocene period of relative global warmth. Sea-level oscillations of 10-30m were paced by obliquity.

摘要

对深海有孔虫δ¹⁸O记录进行的冰量校准表明,上新世中期轨道影响导致的海平面波动幅度高达30米,假设西南极冰盖(WAIS)和格陵兰冰盖完全消融,东南极冰盖(EAIS)现今质量将损失高达30%。这些海平面振荡驱动了全球大陆架反复出现的海侵和海退。新西兰的旺阿努伊盆地拥有最完整的浅海晚新近纪地层记录,以连续旋回地层学的形式呈现,代表了自约360万年前以来每41ka和100ka的海平面周期。本文综合了与海洋同位素阶段M2 - 100(约340 - 240万年前)相对应的浅海沉积旋回中基于动物群得出的古水深数据。我们的方法通过对总沉降和压实沉积物堆积施加限制,估算了海平面上升对古水深曲线的贡献。海平面估算值与δ¹⁸O曲线和数值冰盖模型得出的结果一致,这意味着在全球相对温暖的上新世中期,WAIS和EAIS的沿海边缘对日照的轨道振荡具有显著敏感性。10 - 30米的海平面振荡受倾角控制。

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