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Focus Group Meeting "Lithospheric structre, deformation and breakup processes"

The meeting took place on February 3, 2014, at the BGR Hannover.
When Feb 03, 2014
from 02:55 PM to 02:55 PM
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GFZ Potsdam: Ingo Dressel, Magdalena Scheck-Wenderoth, Robert Trumbull, Tobias Weber

LMU München: Hans-Peter Bunge

AWI Bremerhaven: Jens Gruetzner

BGR Hannover: Katharina Becker, Hannes Koopmann, Michael Schnabel


Tobias Weber: Project RECOM, modeling atmosphere-ocean circulation during the Early Eocene.

                The main input factor for this modeling is the bathymetry. During the Eocene, the Earth was not covered by snow or ice and the polar regions has been up to 40 degrees warmer than today. The tectonic changes in the area of Panama and the Tethys have major impact on the flow direction within the Atlantic Ocean. The missing deep water circulation in the Eocene can be confirmed by seismic data, where no sediment drifts are imaged for this time.

Jens Gruetzner: Sediment transport and deposition in the western South Atlantic during the past 60 mill years - a project description.

                Between 65 to 34 Ma no deep water currents can be observed in the South Atlantic. At 34 Ma, the formation of deep water started in the Weddell Sea. The mudwaves show an irregular pattern south of 40°S. Further north, this pattern is more homogeneous. This might be due to a slow down of water currents caused by the North Atlantic Deep Water. This has to be further checked with stratigraphic, tectonic and climatic events.

Ingo Dressel: Evolution of the SW African passive continental margin during the post-rift phase.

                The model for the paleotopographic evolution comprises 3 sedimentary layers as well as one crustal layer with an initial thickness of 35 km overlaying the mantle. A McKenzie based stretching model results in a minimum uplift of 200 m during the Cenozoic. The possibility of a uniform African crust during the last 200 Ma is not supported by the model.

Katharina Becker: High velocity lower crust of the South Atlantic lower margins and implication of the break-up.

                 The areas of high velocity lower crust (HVLC) show distinct variations within the South Atlantic. The sizes increases from South to North, while the volume of the HVLC is generally 3-4 times larger at the African margin compared to the American margin. Melting scenarios show that the African margin can be explained by a higher material flux while the American margin may be dominated by a thicker lithospheric mantle.