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Geophysical constraints on exhumation mechanisms of high-pressure rocks : the Saxothuringian case between the Franconian Line and Elbe Zone

Authors

Krawczyk,  C. M.
Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Stein,  E.
External Organizations;
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Choi,  S.
External Organizations;
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Oettinger,  G.
Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Schuster,  K.
Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Götze,  H.-J.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Haak,  V.
Deutsches GeoForschungsZentrum;
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Oncken,  Onno
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
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Prodehl,  C.
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Schulze,  Albrecht
Deutsches GeoForschungsZentrum;
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Citation

Krawczyk, C. M., Stein, E., Choi, S., Oettinger, G., Schuster, K., Götze, H.-J., Haak, V., Oncken, O., Prodehl, C., Schulze, A. (2000): Geophysical constraints on exhumation mechanisms of high-pressure rocks: the Saxothuringian case between the Franconian Line and Elbe Zone. - In: Franke, W., Haak, V., Oncken, O. (Eds.), Orogenic processes: quantification and modelling in the Variscan Belt, (Geological Society special publication; 179), Geological Society, 303-322.


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_228288
Abstract
Major bodies of high-pressure (HP) rocks in the Saxo-Thuringian Belt in East Germany (Saxonian Granulite Massif, Erzgebirge) are investigated using a variety of geophysical methods (seismic reflection and refraction survey, magnetotelluric studies, gravity modelling). The Saxonian Granulite Massif and the Erzgebirge are not a continuous feature, as can be see from discontinuous reflections, offset of upper-crustal seismic refraction velocity layers, and crustal resistivity increasing towards the Erzgebirge. Their juxtaposition during the evolution of two Variscan-age thrust wedges may have controlled from the southeast to the northwest onto the Saxo-Thuringian Basin, whereas the later one propagated southwards and uplifted the Saxo-Thuringian granulites from deeper levels. To the southwest, the granulites are observed at shallow depth as far as the Franconian Line; to the southeast they extend down to the Moho, or they continue at mid-crustal levels. The granulites beneath the Saxo-Thuringian Belt can only have originated in one of two subduction zones: either through 'subduction erosion' and subsequent underplating of parts of the Saxo-Thuringian Plate from the north, of by intracrustal plug flow of overheated material from the southeast.