2021
How many extensional stages marked the variscan gravitational collapse in the Bohemian Massif?
BÁRTA, Ondřej, Rostislav MELICHAR a Jan ČERNÝZákladní údaje
Originální název
How many extensional stages marked the variscan gravitational collapse in the Bohemian Massif?
Autoři
BÁRTA, Ondřej (203 Česká republika, garant, domácí), Rostislav MELICHAR (203 Česká republika, domácí) a Jan ČERNÝ (203 Česká republika)
Vydání
Annales Societatis Geologorum Poloniae, Polsko, Geological Society of Poland, 2021, 0208-9068
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 2.059
Kód RIV
RIV/00216224:14310/21:00121691
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000674745600003
Klíčová slova anglicky
Gravitational collapse; anisotropy of magnetic susceptibility; U-Pb zircon geochronology; Variscan orogen; Central Bohemian plutonic complex
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 3. 9. 2021 10:47, Mgr. Marie Šípková, DiS.
Anotace
V originále
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.