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@article{1773102,
author = {Bárta, Ondřej and Melichar, Rostislav and Černý, Jan},
article_location = {Polsko},
article_number = {2},
doi = {http://dx.doi.org/10.14241/asgp.2021.08},
keywords = {Gravitational collapse; anisotropy of magnetic susceptibility; U-Pb zircon geochronology; Variscan orogen; Central Bohemian plutonic complex},
language = {eng},
issn = {0208-9068},
journal = {Annales Societatis Geologorum Poloniae},
title = {How many extensional stages marked the variscan gravitational collapse in the Bohemian Massif?},
url = {https://geojournals.pgi.gov.pl/asgp/article/view/32966/24150},
volume = {91},
year = {2021}
}
TY - JOUR
ID - 1773102
AU - Bárta, Ondřej - Melichar, Rostislav - Černý, Jan
PY - 2021
TI - How many extensional stages marked the variscan gravitational collapse in the Bohemian Massif?
JF - Annales Societatis Geologorum Poloniae
VL - 91
IS - 2
SP - 121-136
EP - 121-136
PB - Geological Society of Poland
SN - 02089068
KW - Gravitational collapse
KW - anisotropy of magnetic susceptibility
KW - U-Pb zircon geochronology
KW - Variscan orogen
KW - Central Bohemian plutonic complex
UR - https://geojournals.pgi.gov.pl/asgp/article/view/32966/24150
N2 - Tectonic development of the Variscan belt in Central Europe included, besides important compression, also an extensional phase related to gravitational collapse, which governed the origin of many sedimentary basins and magmatic bodies. One of these bodies is the Benešov pluton, featuring primary magmatic fabrics as well as deformational fabrics, related to subsequent extensional stages. Recognition of these fabrics and their links to other significant extension-induced structures in the Bohemicum and Moldanubicum not only sheds new light on the pluton itself but also extends a general knowledge of deformational stages, accompanying gravitational collapse of the Variscan orogen. The authors found that this pluton was strongly strained in a normal-faulting regime under brittle-ductile conditions. The age of deformation is constrained by a magmatic age of 347 ±3 Ma and by the age of Carboniferous sedimentary cover. New data indicate a three-stage extensional history during the phase of gravitational collapse: (1) Tournaisian extension (~350–345 Ma) within arc-related tonalitic intrusions; (2) late Viséan to Serpukhovian extension (~332–320 Ma), connected to the brittle-ductile unroofing and origin of a NE–SW basin system; and (3) Gzhelian to Cisuralian extension (~303–280 Ma), related to normal faulting and sedimentation in “Permo–Carboniferous” troughs, elongated NNE–SSW. Consequently, the gravitational collapse studied involved a complex succession of individual extensional stages, rather than a simple process.
ER -
BÁRTA, Ondřej, Rostislav MELICHAR a Jan ČERNÝ. How many extensional stages marked the variscan gravitational collapse in the Bohemian Massif? \textit{Annales Societatis Geologorum Poloniae}. Polsko: Geological Society of Poland, 2021, roč.~91, č.~2, s.~121-136. ISSN~0208-9068. Dostupné z: https://dx.doi.org/10.14241/asgp.2021.08.
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