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- C41F-1095: Insights into sedimentation driven moraine building in marine terminating glaciers: A look inside from the TERMINUS expedition, west Greenland
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Board 1095‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Sean Gulick, The University of Texas at Austin (First Author, Presenting Author)
Jonathan Amendola, University of Texas, Institute for Geophysics
John Goff, University of Texas, Institute for Geophysics
John M. Jaeger, University of Florida
Rachael Durr, University of Florida
Dallas Sherman, Institute for Geophysics, Jackson School of Geosciences, UT Austin
Sediment deposited at the toe (terminus) of glaciers can build up into a bank that stabilizes glaciers delaying retreat during climate warming. During the TERMIUS project we used seismic data to image the internal structure of these banks in two west Greenland fjords: Kangerlussuup Sermia (KAS) and Kangerluarsuup Sermia (KSS). Each imaged morainal bank consisted of arcuate and parallel reflectors showing an outward growth of individual banks through gravity flow processes. Two styles of retreat are evident: (1) a short retreat (100s of meters) to subsequently form a new bank on the upfjord side of the same complex in a self-similar style of growth, or (2) a long (kilometers) retreat to establish an entirely new morainal bank complex. The balance between erosion that forms overdeepenings behind a morainal bank complex and sediment flux is potentially important for driving longer retreats. However, reduction in fjord depth through proximal periglacial processes and distal plume-driven sedimentation infilling old overdeepenings are likely important for any readvance.
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