222 D58. Recent Advances in Paleoclimatology and Paleoceanography

Wednesday, 7 November 2018
8:00 AM - 12:00 PM
Room 138-139

ISOSTATICALLY CORRECTED MODELED MULTILAYER SEDIMENT COVER FOR GLOBAL PALEOBATHYMETRY RECONSTRUCTION WITH IMPROVED PARAMETERIZATION USING VARYING SEDIMENT DENSITIES FROM OCEAN DRILLING PROGRAM(S)

Paper number: 222-3
Program: Technical Sessions
Time: 8:30 AM – 8:45 AM

Authors

  • Arghya Goswami Presenting Author
    Northwest Missouri State University, Maryville, MO

Abstract

OES paleobathymetry reconstruction methodology combines a simple standard geophysical plate cooling model (depth-to-basement) based on the published ages of the oceanic crust, modeled global oceanic sediment thicknesses, and a generalized sediment wedge model (SWM) representing continental shelf-slope-rise (SSR) structures calibrated at modern heterogeneous continental margins, both active and passive types. On top of this depth-to-basement, a modeled multilayer sediment layer is added isostatically, typically derived from area-corrected published global sediment thickness data. In this study we are presenting a prudent parameterization method for this modeled oceanic sediment thickness layer replacing the previously used very simple linear extrapolation of sediment densities with 100 m increments, calibrated from 10 different published sediment densities.

The parameters for this updated sediment model are calculated using empirical relationships between the underlying crustal age, water depth, location of carbonate compensation depth, distance from land, predicted sediment types (namely terrigenous, clay-rich, and/or calcareous-rich) and corresponding individual sediment type densities. The sediment densities are again entirely recalibrated using a database of published sediment densities, with more than 45,000 records, mainly obtained from the DSDP, ODP and IODP publications.

The difference between the old and new update modeled sediment layer is presented here, along with the sediment density database, for at least two different geological time intervals, the Cenomanian-Turonian Boundary (94 Ma) and Paleocene-Eocene Thermal Boundary (56 Ma); for which currently we are reconstructing updated paleobathymetry.

Geological Society of America Abstracts with Programs. Vol. 50, No. 6

doi: 10.1130/abs/2018AM-324088

© Copyright 2018 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.