Post-Variscan thermal history of the Moravo-Silesian lower Carboniferous Culm Basin (NE Czech Republic - SW Poland)
PBN-AR
Instytucja
Wydział Geologii, Geofizyki i Ochrony Środowiska (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Tectonophysics (35pkt w roku publikacji)
ISSN
0040-1951
EISSN
1879-3266
Wydawca
Elsevier Science BV
DOI
Rok publikacji
2017
Numer zeszytu
Strony od-do
643--662
Numer tomu
712-713
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
1.42
Autorzy
(liczba autorów: 4)
Pozostali autorzy
+ 3
Słowa kluczowe
EN
apatite
zircon
thermochronology
Moravo-Silesian Culm Basin
Rheno-Hercynian Zone
variscides
Streszczenia
Język
EN
Treść
Apatite fission track analysis (AFT) and zircon (U-Th)/He thermochronology (ZHe) have been carried out for a lower Carboniferous greywacke succession of the Moravo-Silesian Culm Basin in the Nizky jesera Mountains. The range of apparent zircon helium ages is 303-233 Ma (late Carboniferous to Early Triassic) in the eastern part of the basin, whilst they are significantly younger in the western part, ranging from 194 to 163 Ma (Early Middle Jurassic). Apatite fission track central ages range from 152 (Latest Jurassic) to 44 Ma (Eocene), with the majority being grouped between 114 (Aptian) and 57 Ma (Paleocene). All samples experienced substantial post-depositional thermal reset; both the AFT ages and the ZHe are considerably younger than the depositional ages. The mean track length varies in the range between 12.5 and 15.4 mu m. The unimodal track length distribution, the relatively short mean track length (in most samples), and their rather low standard deviation values (1.2 to 2.1 mu m) indicate that their thermal history was determined by Variscan and post-Variscan heating event(s) followed by a prolonged residence in the apatite partial annealing zone in the Mesozoic and finally by cooling in the Paleogene. Geological evidence combined with thermal modeling based on AFT and ZHe data indicate that the lower Carboniferous strata had already reached maximum palaeotemperatures in the late Carboniferous, however, they were presumably later re-heated during the Permian-Triassic. Post-Variscan extensional tectonics events were responsible for high heat flow that together with Carboniferous burial could account for the reset of both thermochronometers. A major phase of cooling occurred in the Late Cretaceous. Finally, exhumation was probably faster in the Paleogene, causing the present-day exposure of the studied rocks.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:109694
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