Global sediment thickness data set updated for the Australian-Antarctic Southern Ocean

We present a new, 5 min sediment thickness grid for the Australian-Antarctic region (60E-155E,30S-70S). New seismic reflection and refraction data have been used to add detail to the conjugateAustralian and Antarctic margins and intervening ocean floor where regional sediment thickness patternswere...

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Bibliographic Details
Published in:Geochemistry, Geophysics, Geosystems
Main Authors: Whittaker, J, Goncharov, A, Williams, SE, Muller, RD, Leitchenkov, G
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2013
Subjects:
Earth Sciences
Geology
Structural geology and tectonics
Antarctic
Indian
Southeast Indian Ridge
Southern Ocean
Antarc*
Online Access:https://doi.org/10.1002/ggge.20181
http://ecite.utas.edu.au/88442
Description
Summary:We present a new, 5 min sediment thickness grid for the Australian-Antarctic region (60E-155E,30S-70S). New seismic reflection and refraction data have been used to add detail to the conjugateAustralian and Antarctic margins and intervening ocean floor where regional sediment thickness patternswere poorly known previously. On the margins, sediment thickness estimates were computed fromvelocity-depth functions from sonobuoy/refraction velocity solutions ground-truthed against seismicreflection data. For the Southeast Indian Ridge abyssal plains, sediment thickness contours from Geliet al. (2007) were used. The new regional minimum sediment thickness grid was combined with theglobal National Geophysical Data Center (NGDC) sediment grid to create an updated global grid. Evenusing the minimum estimates, sediment accumulations on the extended Australian and Antarcticcontinental margins are 2 km thicker across large regions and up to 9 km thicker in the Ceduna Basincompared to the global NGDC compilation of sediment thickness data.

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