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The Last Global Transgression of the World Ocean: Glacio-Eustasy or Tectonics?
Geotectonics ( IF 1.0 ) Pub Date : 2020-09-22 , DOI: 10.1134/s0016852120040056
R. B. Krapivner

The article substantiates the conclusion about the tectonic nature of the last global transgression of the World Ocean. It is based on the results of marine studies in which complete sections of transgression sediments were obtained that were separated from their substrate by the diachronous boundary of a stratigraphic uncomformity or those beginning with littoral facies. The radiocarbon dating of such sections at different levels made it possible to calculate the average rate of relative sea level rise by plotting the radiocarbon age of sediments against depth from the seafloor surface. This was constructed based on three reference areas: the underwater slope of the island of Barbados, the North Sea shelf, and the Barents Sea shelf. It was revealed that the average rates of relative sea level rise at different points in the same water area sometimes differ by an order of magnitude, which is incompatible with the eustatic nature of transgression. The maximum transgression amplitudes in the Barents and North seas are several times higher than those permissible for glacio-eustasy. It is assumed that tectonic subsidence of the area due to the planetary nature of the last marine transgression overlapped its immersion, associated with the incomplete formation of the youngest oceanic depressions of the planet located north of the submarine Greenland–Scotland Ridge.



中文翻译:

世界海洋的最后一次全球海侵:冰E还是构造?

该文章证实了有关世界海洋最近一次全球性海侵的构造性质的结论。它基于海洋研究的结果,其中获得了完整的海相沉积物断面,这些断面是通过地层不整合面或沿岸相开始的年代学边界从其基底中分离出来的。这些剖面在不同水平上的放射性碳测年可以通过绘制沉积物的放射性碳年龄相对于距海床表面深度的关系图来计算相对海平面上升的平均速率。它是根据三个参考区域构建的:巴巴多斯岛的水下坡度,北海陆架和巴伦支海陆架。结果表明,同一水域中不同地点的平均相对海平面上升率有时相差一个数量级,这与海侵的欣喜若狂不符。巴伦支海和北海的最大海啸振幅比冰河-狂喜所允许的最大海啸振幅高出几倍。据推测,由于最后一次海侵的行星性质,该地区的构造沉降与它的浸没重叠,这与该海底格陵兰-苏格兰山脊以北的行星最年轻的海洋凹陷的不完整形成有关。巴伦支海和北海的最大海啸振幅比冰河-狂喜所允许的最大海啸振幅高出几倍。据推测,由于最后一次海侵的行星性质,该地区的构造沉降与它的浸没重叠,这与该海底格陵兰-苏格兰山脊以北的行星最年轻的海洋凹陷的不完整形成有关。巴伦支海和北海的最大海啸振幅比冰河-狂喜所允许的最大海啸振幅高出几倍。据推测,由于最后一次海侵的行星性质,该地区的构造沉降与它的浸没重叠,这与该海底格陵兰-苏格兰山脊以北的行星最年轻的海洋凹陷的不完整形成有关。

更新日期:2020-09-23
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