Ross Sea unconformities digital grids in depth and two-way time

• Main Authors: Sorlien, Christopher, Wilson, Douglas S.
• Format: Dataset
• Language: English
• Published: U.S. Antarctic Program (USAP) Data Center 2018
• Subjects: Miocene; Oligocene; Geology/Geophysics - Other; Seismic Reflection; Antarctica; Continental Margin; Cryosphere; Marine Geoscience; Antarctic; The Antarctic; Ross Sea; Antarc*
• Online Access: https://dx.doi.org/10.15784/601098; http://www.usap-dc.org/view/dataset/601098

This data set includes digital 1 km grids of sub-bottom stratigraphy of most of Ross Sea. In addition to acoustic basement (same as top syn-rift sedimentary rocks in Central Trough and probably other basins), these grids include Oligocene and Miocene horizons that are unconformities in most areas. A sea floor grid is also included. Except for the sea floor grid, the grids are trimmed to be relatively close to control of interpreted seismic stratigraphy. The grids are provided in two way travel time and in depth. Math can be performed on the corresponding time and depth grids to recreate the 3D interval velocity model that was used. The velocity of the water used was 1450 m/s. More detailed descriptions of the work are found in the Final NSF report for PLR1341585 by C. Sorlien, B. Luyendyk, and D. Wilson. The grids are continuous so are merged with the sea floor where there is outcrop, or with basement if there is onlap, or with a young unconformity where there is sub-bottom truncation. The filenames include the name of the horizon (unconformity) and whether they are in time or depth. \"etc.\" means there are two or more horizons that have been merged. Most of the horizons are named and defined in the ANTOSTRAT (1995) atlas. The starting points for many of these horizons are ANTOSTRAT [1995] near DSDP sites 273, 272, and 270. In other areas we deviate from the interpretation of ANTOSTRAT [1995]. late Oligocene through middle Miocene horizons, interpreted very close to the ANTOSTRAT [1995] at DSDP Site 273 in Central Trough, are much deeper in our interpretation within Terror Rift. These horizon grids usually include the sea floor where there is outcrop or acoustic basement (top syn-rift in some basins) where there is onlap. ANTOSTRAT (1995), Seismic Stratigraphic Atlas of the Ross Sea, in Geology and Seismic Stratigraphy of the Antarctic Margin, edited by A. K. Cooper, Barker, P. F., Brancolini, G., 22 plates, American Geophysical Union, Washington, D.C.