10.6084/m9.figshare.3454352.v1
StanisŁaw Mazur
StanisŁaw
Mazur
W.James Dunlap
W.James
Dunlap
Krzysztof Turniak
Krzysztof
Turniak
Teresa Oberc-Dziedzic
Teresa
Oberc-Dziedzic
Age constraints for the thermal evolution and erosional history of the central European Variscan belt: new data from the sediments
and basement of the Carboniferous foreland basin in western Poland
Geological Society of London
2016
Variscan foreland basin
Carboniferous foreland basin
source rocks
Devonian cooling signature
Variscan basement
SW Poland
age constraints
erosional history
rocks exhumed
detrital micas
European Variscan belt
mica grains
Variscan collisional event
phyllite sample displays
SW Poland exhibit
age spectrum
foreland basin
phyllite yields
data
Ar
Geology
2016-06-21 12:04:10
Dataset
https://geolsoc.figshare.com/articles/dataset/Age_constraints_for_the_thermal_evolution_and_erosional_history_of_the_central_European_Variscan_belt_new_data_from_the_sediments___and_basement_of_the_Carboniferous_foreland_basin_in_western_Poland/3454352
<p>Three Carboniferous-age detrital muscovites from the Variscan foreland basin of SW Poland and two muscovites from phyllites
underlying the basement have been dated by the <sup>40</sup>Ar/<sup>39</sup>Ar step-heating and single-crystal laser fusion method. <sup>40</sup>Ar/<sup>39</sup>Ar analysis of the detrital micas defines step-heating preferred ages of 370.7 ± 1.4, 363.0 ± 1.9 and 355.0 ± 1.3 Ma. Single-crystal
laser fusion data indicate little dispersion for the first of three samples, with an integrated age that closely matches the
step-heating data, but the latter two describe inhomogeneous populations. The white mica concentrate from one phyllite yields
a step-heating preferred age of 358.6 ± 1.8 Ma. The second phyllite sample displays an incremental discordant apparent age
spectrum representing a mixture of white mica grains of varying ages. Our most important finding is that the Variscan foreland
basin was supplied by source rocks that were exhumed and cooled in the Late Devonian, probably as a result of an early Variscan
collisional event, previously largely undocumented. Although accessible exposures of the Variscan basement in SW Poland exhibit
only a minor component of rocks exhumed before the Carboniferous, our work suggests that large tracts of rocks with a Devonian
cooling signature are preserved at depth beneath the foreland basin.
</p>