The Glueckstadt Graben of the North-German Basin: new insights into the structure from 3D and 2D gravity analyses |
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Authors: | Tamara Yegorova Yuriy Maystrenko Ulf Bayer Magdalena Scheck-Wenderoth |
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Institution: | (1) GeoForschungsZentrum Potsdam, Telegrafenberg C426, 14473 Potsdam, Germany;(2) Institute of Geophysics, National Academy of Sciences of Ukraine, 03680 Kiev, Ukraine |
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Abstract: | The structure of the Glueckstadt Graben has been investigated by use of 3D gravity backstripping technique and by 2D gravity
and magnetic modelling. Subtracting the gravity effects of the Meso-Cenozoic sediments together with Permian salt reveals
a positive residual anomaly within the Glueckstadt Graben. This anomaly includes two local maxima over the Westholstein and
Eastholstein Troughs. The 2D gravity models point to the presence of a high-density body within the lower crust of the Glueckstadt
Graben. In addition, the results of 2D magnetic modelling indicate that the central part of the high-density body is overlain
by an area with high susceptibility. Most probable, the formation of this high-density body is a result of complex poly-phase
tectonic history of the study area. Finally, the results of gravity modelling indicate that Permian salt is not homogeneous.
3D gravity analysis and, especially, 2D gravity modelling have distinguished the differences in degree of salt saturation
in salt-rich bodies, and elucidate the proportion of Rotliegend salt. |
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Keywords: | Glueckstadt Graben 3D and 2D gravity analyses 2D magnetic modelling Permian salt |
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