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Structure and dynamics of the Antarctic lithosphere: great opportunities with new satellite data.

Structure and dynamics of the Antarctic lithosphere: great opportunities with new satellite data. M.K. Kaban , GFZ Potsdam. Main tasks. Construction of an integrative model of the crust based on a joint interpretation of gravity, seismic and seismological data.

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Structure and dynamics of the Antarctic lithosphere: great opportunities with new satellite data.

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  1. Structure and dynamics of the Antarctic lithosphere: great opportunities with new satellite data. M.K. Kaban , GFZ Potsdam

  2. Main tasks • Construction of an integrative model of the crust based on a joint interpretation of gravity, seismic and seismological data. • Thermal model of the lithosphere from integration of tomography models, determination of the Curie depth from magnetic field interpretation and mineral physics. • Rheological modeling of the lithosphere. Determination of the effective elastic plate thickness of the lithosphere for different time scales. • Application: ice shield dynamics. • Application: lithosphere dynamics in respond to surface and sublithospheric loadings.

  3. Integrative Model of the Crust Expected model: Main boundaries, Density, Petrology Data: gravity field, ice shield thickness, gravity gradients, tomography models, receiver functions, available seismic profiles (sparse but may be used as reference points) Example from SPP1257: model for the Central Tien Shan Kaban and Yuanda (2014) (under review)

  4. Expected model: 3D temperature distribution; separation of thermal and compositional anomalies • Data: • Tomography models for the upper mantle constrained by mineral physics • Curie depth from the magnetic field interpretation • Boundary determinations of heat flow as the references • Cooperation with section 2.3: Prof. Claudia Stolle, Dr. Vincent Lesur, Dr. Foteini Vervelidou Thermal Model of the Lithosphere Example for tomography & mineral physics: Depth 60 km, Europe (Tesauro et al., 2010) Magnetic Moho (Maule et al., 2005)

  5. Effective Elastic Thickness and Strength of the Lithosphere EET describes a reaction of the lithosphere to surface and sublithospheric loadings. It is principle for modeling of the lithosphere dynamics and coupling with surface processes. In Antarctica we have 2 types of the surface loading: bedrock topography and ice, which acts at different time scales. Cross-spectral analysis of the gravity field, bedrock topography and ice thickness will be used to determine variations of EET over the continent and its anisotropy.

  6. ApplicationsCoupling of the Lithosphere and Ice Shield Example for Greenland: (Petrunin et al., 2013, Nature Geoscience; Rogozhina et al., 2014, under review) Thermal regime of the lithosphere plays an important role in the ice balance. Heat flow from the lithosphere is directly related to basal ice melting.

  7. Modeling of the lithosphere dynamics under surface and sublithospheric loading Temperature, density and rheological models of the crust and upper mantle together with the ice-shield history will be employed to model dynamics of the lithosphere, strain rates and stress distribution. Kaban et al., 2014 under review.

  8. Thank you!

  9. Modeling of the Upper Mantle Main task: separation the effects of temperature and compositional variations. Example for North America (Kaban et al., 2014, submitted):

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