GlobSed: Updated Total Sediment Thickness in the World's Oceans
GlobSed: Updated Total Sediment Thickness in the World's Oceans
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DOI：
10.1029/2018gc008115
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发表时间：
2019-04-01
影响因子：
3.5
通讯作者：
Hopper, J. R.
中科院分区：
文献类型：
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作者：
Straume, E. O.;Gaina, C.;Hopper, J. R.
我们提出了GlobSed，一个新的全球5弧分总沉积物厚度网格的世界海洋和边缘海。GlobSed覆盖的区域比以前公布的全球网格更大，并纳入了东北大西洋，北极，南大洋和地中海地区的更新，这导致估计的海洋沉积物总量增加了29.7%。我们使用这个新的全球网格和一个修订的全球海洋岩石圈年龄网格，以评估总沉积物厚度和年龄的下伏海洋岩石圈和它的纬度之间的关系。一个分析近似模型被用来在数学上描述主要海洋盆地的沉积趋势，并允许在任何给定的地质时期的古水深重建。这项研究提供了世界海洋沉积物厚度分布急需的更新，并提供了一个模型，随着时间的推移，海洋地壳上的沉积速率，同意以及用于比较选定的钻孔数据。简单的语言摘要我们已经构建了一个新的全球海洋沉积物厚度图，GlobSed，从以前出版的地图和本研究中编译的新数据。GlobSed与为这项研究开发的岩石圈年龄新地图一起使用，以分析沉积物厚度如何随底层海洋地壳和纬度的年龄而变化。结果表明，沉积物厚度随着海洋地壳的年龄增加，向高纬度的南部和北方和向赤道的明显的年龄-纬度的依赖性。此外，我们还计算了海洋中沉积物的总体积，与先前公布的全球地图相比，增加了29.7%。此外，我们开发了一个数学公式的沉积物厚度作为年龄和纬度的函数，描述了沉积物厚度模式在合理的误差范围内的海洋，我们认为，这是一个很好的近似估计沉积物厚度在海洋盆地通过时间。
We present GlobSed, a new global 5-arc-minute total sediment thickness grid for the world's oceans and marginal seas. GlobSed covers a larger area than previously published global grids and incorporates updates for the NE Atlantic, Arctic, Southern Ocean, and Mediterranean regions, which results in a 29.7% increase in estimated total oceanic sediment volume. We use this new global grid and a revised global oceanic lithospheric age grid to assess the relationship between the total sediment thickness and age of the underlying oceanic lithosphere and its latitude. An analytical approximation model is used to mathematically describe sedimentation trends in major oceanic basins and to allow paleobathymetric reconstructions at any given geological time. This study provides a much-needed update of the sediment thickness distribution of the world oceans and delivers a model for sedimentation rates on oceanic crust through time that agrees well with selected drill data used for comparison.Plain Language Summary We have constructed a new global ocean sediment thickness map, GlobSed, from previously published maps and new data compiled in this study. GlobSed is used together with a new map of lithospheric ages developed for this study to analyze how sediment thickness changes with respect to the age of the underlying oceanic crust and latitude. The results show a clear age-latitude dependence where sediment thickness increases with age of the oceanic crust, toward high southern and northern latitudes and toward the equator. In addition, we calculate the total volume of sediments in the oceans, which shows an increase of 29.7%, compared to previously published global maps. Further, we develop a mathematical formula for sediment thickness as a function of age and latitude that describes the sediment thickness pattern in the oceans within reasonable error, and we suggest that this is a good approximation for estimating sediment thickness in oceanic basins through time.