Linking GHF to crustal structures and DBMS estimates in the Amundsen Sea Sector


Contact
ricarda.dziadek [ at ] awi.de

Abstract

The West Antarctic Rift System is one of the least understood rift systems on earth, but displays a unique coupled relationship between tectonic processes and ice sheet dynamics. Geothermal heat flux (GHF) is a poorly constrained parameter in Antarctica and suspected to affect basal conditions of ice sheets, i.e., basal melting and subglacial hydrology. Thermomechanical models demonstrate the influential boundary condition of geothermal heat flux for (paleo) ice sheet stability. Young, continental rift systems are regions with significantly elevated geothermal heat flux (GHF), because the transient thermal perturbation to the lithosphere caused by rifting requires ~100 Ma to reach long-term thermal equilibrium. We discuss airborne, high-resolution magnetic anomaly data from the Amundsen Sea Sector, to provide additional insight into deeper crustal structures related to the West Antarctic Rift System in the Amundsen/Bellingshausen sector. With the depth-to-the-bottom of the magnetic source (DBMS) estimates we reveal spatial changes at the bottom of the igneous crust and the thickness of the magnetic layer, which can be further incorporated into tectonic interpretations.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
TACtical Workshop, 21 Mar 2018 - 23 Mar 2018, Hobart, Australia.
Eprint ID
46948
Cite as
Dziadek, R. , Ferraccioli, F. and Gohl, K. (2018): Linking GHF to crustal structures and DBMS estimates in the Amundsen Sea Sector , TACtical Workshop, Hobart, Australia, 21 March 2018 - 23 March 2018 .


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