PaleoAge and PaleoDepth dataset: age and bathymetry of the world's ocean crust for the last 140 million years

The PaleoAge and PaleoDepth dataset provides access to grid data relating to the age and bathymetry of the world's ocean crust for the last 140 million years. The PaleoAge and PaleoDepth dataset focuses on two specific problems - the reconstruction of vanished oceans and the tracking of oceanic depth through time.

Reconstructing vanished oceans

The dataset establishes the locations and geometry of mid ocean ridges through time on the basis of marine magnetic anomaly identifications, geological information such as paleomagnetic data from terranes and microcontinents, especially in the Tethys Ocean, mid-oceanic ridge subduction events and the rules of plate tectonics. Based on a global set of tectonic plate rotations, a set of refined seafloor isochrons is constructed, following the interpolation technique outlined by Müller et al. (1997; 2008).

Oceanic depth through time

The EarthByte Group has created a set of paleo-bathymetry maps by adding major oceanic plateaus and sediment thickness to existing reconstructed basement depth maps. These maps enable the computation of oceanic crustal area and mean depth through time.

The PaleoAge and PaleoDepth dataset and supporting documentation is available via the EarthByte website. The dataset includes documents (including related papers, supplementary materials and tables), images, grid data, associated user documentation, videos, and links to related datasets.

古年龄与古深度（PaleoAge and PaleoDepth）数据集可提供过去1.4亿年间全球洋壳年龄与海底水深（bathymetry）的网格数据（grid data）访问权限。该数据集聚焦两大核心研究方向——已消亡洋盆的重建，以及随地质时间推移的洋壳水深追踪。

重建已消亡洋盆
本数据集基于海洋磁异常（marine magnetic anomaly）识别、来自地体（terranes）与微大陆（microcontinents）的古地磁数据等地质信息（尤其针对特提斯洋（Tethys Ocean）区域）、洋中脊俯冲（mid-oceanic ridge subduction）事件以及板块构造（plate tectonics）规则，重建了不同地质时期洋中脊（mid-ocean ridges）的位置与几何形态。基于全球板块旋转（tectonic plate rotations）数据集，参考Müller等人（1997；2008）提出的插值（interpolation）方法，研究团队构建了一套精细化的海底等时线（seafloor isochrons）。

随时间推移的洋壳水深
EarthByte团队通过在已有的重建基底水深图（reconstructed basement depth maps）中加入主要大洋高原（oceanic plateaus）与沉积物厚度（sediment thickness）数据，构建了一套古海底地形图（paleo-bathymetry maps）。这套古海底地形图可用于计算不同地质时期的洋壳面积（oceanic crustal area）与平均水深。

古年龄与古深度数据集及其配套文档可通过EarthByte官网获取。该数据集包含相关文献、补充材料与表格等文档、图像、网格数据、配套用户手册、视频，以及相关数据集的链接。