6533b7cffe1ef96bd1259a06

RESEARCH PRODUCT

Tonalite sill emplacement at an oblique plate boundary: northeastern margin of the Bohemian Massif

Frantisˇek HroudaPavla SˇtípskáMatthew ParryAlfred KrönerJosef JezˇekKarel Schulmann

subject

Shearing (physics)geographygeography.geographical_feature_categoryOblique caseMassifTranspressionFlatteningPlate tectonicsGeophysicsSillPetrologyGeomorphologyGeologyEarth-Surface ProcessesPlane stress

description

Abstract A tonalitic sill has been examined at the Variscan transpressive boundary of the Lugian and Silesian plates at the NE margin of the Bohemian Massif. A structural, petrological and geochronological study reveals that it was emplaced syn-tectonically with major ductile shearing in lower crustal rocks. Magmatic and pre-rheological critical melt percentage (RCMP) fabrics are concordant with the hanging wall structures but discordant with those of the footwall. The AMS study shows the predominance of flattening strain at the margins and plane strain fabrics in the core. Numerical modelling of AMS fabrics is in good agreement with the hypothesis of magma flow and deformation in oblique transpression. A tectonic model was developed explaining emplacement and syn-tectonic deformation of progressively cooled tonalitic intrusion.

yearjournalcountryeditionlanguage
1997-10-01Tectonophysics
https://doi.org/10.1016/s0040-1951(97)00146-7