Speleothem evidence for MIS 5c and 5a sea level above modern level at Bermuda

Speleothem evidence for MIS 5c and 5a sea level above modern level at Bermuda
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百慕大 MIS 5c 和 5a 海平面高于现代水平的洞穴证据

DOI:
10.1016/j.epsl.2016.10.005
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发表时间:
2017
影响因子:
5.3
通讯作者:
Wainer K
Wainer K
中科院分区:
地球科学1区
文献类型:
--
作者:
Wainer K

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受冰川-等深线影响的地区的海平面历史对过去的冰盖分布和地球对负荷的变形特征提供了限制。西北大西洋-加勒比区域,特别是百慕大,受到冰川前隆的强烈影响,冰川前隆是冰川期劳伦蒂德冰盖形成的。在接近海平面的高度,洞穴沉积物的生长时间可以提供最低相对海平面(RSL)的记录。在这项研究中,我们使用U-Th测年,以精确的日期从百慕大发现接近现代海平面的洞穴沉积物的生长期。结果表明,在MIS 5e,MIS 5c和MIS 5a期间,该位置的RSL高于现代。这些数据支持先前有争议的迹象,即在MIS 5c和MIS 5a期间,埃塞俄比亚的RSL显著高于其他地点的RSL。我们证实,这是可能的解释范围广泛的MIS 5C-一个相对海平面观测整个西北大西洋-加勒比地区的冰川均衡调整模型,但只有有限的范围内的地幔变形常数。这项研究表明,百慕大的特殊权力,作为衡量的前隆冰川负荷的反应,并表明在这个位置的高水位的潜力显着高于其他地区,有助于解释从早期的高水位百慕大观察到的高海平面。
The history of sea level in regions impacted by glacio-isostasy provides constraints on past ice-sheet distribution and on the characteristics of deformation of the planet in response to loading. The Western North Atlantic–Caribbean region, and Bermuda in particular, is strongly affected by the glacial forebulge that forms as a result of the Laurentide ice-sheet present during glacial periods. The timing of growth of speleothems, at elevations close to sea level can provide records of minimum relative sea level (RSL). In this study we used U–Th dating to precisely date growth periods of speleothems from Bermuda which were found close to modern-day sea level. Results suggest that RSL at this location was above modern during MIS5e, MIS5c and MIS5a. These data support controversial previous indications that Bermudian RSL was significantly higher than RSL at other locations during MIS 5c and MIS 5a. We confirm that it is possible to explain a wide range of MIS5c-a relative sea levels observed across the Western North Atlantic–Caribbean in glacial isostatic adjustment models, but only with a limited range of mantle deformation constants. This study demonstrates the particular power of Bermuda as a gauge for response of the forebulge to glacial loading, and demonstrates the potential for highstands at this location to be significantly higher than in other regions, helping to explain the high sea levels observed for Bermuda from earlier highstands.
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