The 3D model of the crystalline basement of the Cretaceous sediments (Dlouhá mez region)

 

Zuzana Skácelová, Miroslav Rejchrt, Bedřich Mlčoch

Geoscience Research Reports 41, 2008 (GRR for 2007), pages 49–53

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Abstract

Borehole database, geophysical data and detailed geological mapping at a scale of 1 : 25 000 were combined in 3D modelling of relief of crystalline basement rocks underlying Cretaceous platform sediments. Boundaries of individual geological units were plotted along with location of the major tectonic structures. Detailed geophysical data are based on the vertical electric sounding results and are coupled with regional geophysical ones derived from magnetic and gravity survey. SURFER8 software by Golden Software, Inc. was used and more than 86 000 data have been gathered. The basement of Cretaceous sediments is built by rocks metamorphosed to highly varying degree ranging from zeolite to amphibolite facies. Plutonic rocks dominate the central northern part of the investigated area. The mafic Ransko massif occupies the central position in the area. Several structural highs and lows have been established in the basement relief due both to tectonic and compositional discontinuities.