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\begin{document}

\title{Basement topography and sediment thickness beneath Antarctica's Ross Ice
Shelf}



\author[1,1]{Matthew Davis Tankersley}%
\author[1,1]{Huw Joseph Horgan}%
\author[2,2]{Christine Smith Siddoway}%
\author[3,3]{Fabio Caratori Tontini}%
\author[4,4]{Kirsteen Jane Tinto}%
\affil[1]{Victoria University of Wellington}%
\affil[2]{Colorado College}%
\affil[3]{University of Genova}%
\affil[4]{Lamont-Doherty Earth Observatory}%


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  \date{June 14, 2024}


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\begin{abstract}
New geophysical data from Antarctica's Ross Embayment reveal the
structure and subglacial geology of extended continental crust beneath
the Ross Ice Shelf. We use airborne magnetic data from the ROSETTA-Ice
Project to locate the contact between magnetic basement and overlying
sediments. We delineate a broad, segmented basement high with thin
(0-500m) non-magnetic sedimentary cover which trends northward into the
Ross Sea's Central High. Before subsiding in the Oligocene, this feature
likely facilitated early glaciation in the region and subsequently acted
as a pinning point and ice flow divide. Flanking the high are wide
sedimentary basins, up to 3700m deep, which parallel the Ross Sea basins
and likely formed during Cretaceous-Neogene intracontinental extension.
NW-SE basins beneath the Siple Coast grounding zone, by contrast, are
narrow, deep, and elongate. They suggest tectonic divergence upon active
faults that may localize geothermal heat and/or groundwater flow, both
important components of the subglacial system.%
\end{abstract}%



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