Plans and Methods for Bathymetric Reconstructions and Sediment History of the Ocean Basins (BRASH) (Paleoceanographic Mapping Project Progress Report No. 23-0787)
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The project "Bathymetric Reconstructions and Sediment History of the Ocean Basins" (BRASH) will attempt to produce a global synthesis of paleobathymetry maps, which will be used as basis to reconstruct the sediment accumulation history of the ocean basins. The Paleoceanographic Mapping Project (POMP) will complete a global model for Mesozoic and Cenozoic plate motions by the end of 1987. One of the major products of POMP-1987 will be the synthesis of a global isochron map of the ocean floor, which will allow us to produce a set of paleobathymetry maps for all ocean basins using standard depth-age relations (Parsons & Sclater 1977). The main goal of BRASH is to compile a standardized database of all DSDP-and ODP-sediment data and to use this information along with the paleobathymetry maps to reconstruct the sediment accumulation history of the ocean basins. This project is planned to run for three years. Up to now, approaches to quantify the temporal and spatial distribution of marine sediments by calculating accumulation rates have been largely descriptive, since supra-regional models of paleoclimate and paleoceanography were lacking. For BRASH we plan to develop a conceptual model that will allow us to address the interaction between the plate tectonic evolution of an ocean basin with the basin's sediment flux rates and distributions, the extent and facies patterns of ancient epicontinental seas and with the paleoclimate and its impact on ocean circulations.