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- W2005816077 abstract "New 40Ar/39Ar hornblende and muscovite ages from the Moldanubian and Moravian zones of the southeastern Bohemian Massif indicate rapid cooling associated with continental underplating during Early Carboniferous plate collision and closure of the Moravo-Silesian foredeep. 40Ar/39Ar ages have been determined for hornblende concentrates from: (1) amphibolite from the Moldanubian Nappe Complex (including the Dobra gneiss, Rehberg amphibolite and Loosdorf complex: all part of the “Variegated unit”); (2) micaschist structurally overlying the Bittesch gneiss; and (3) amphibolite within the Bittesch gneiss (Moravian Zone). The five hornblende concentrates display variably discordant 40Ar/39Ar age spectra because of contamination with extraneous argon components. However, 36Ar/40Ar vs. 39Ar/40Ar isotope correlations are well defined for the five hornblende concentrates (MSWD < 1.5). Using the inverse abscissa intercepts (40Ar/39Ar ratio) in the age equation yields dates which range between 328.7 ± 3.3 and 341.1 ± 1.4 Ma. There are no detectable differences in age between the Moldanubian and Moravian samples. Two muscovite concentrates have been analyzed from schist collected within the Moravian allochthon (Bittesch and Weitersfeld gneiss units). These display internally concordant 40Ar/39Ar apparent age spectra which define plateau ages of 328.7 ± 0.8 and 325.5 ± 0.7 Ma. The hornblende and muscovite ages are interpreted to date post-Variscan metamorphic cooling through ca. 500°C and ca. 400°C, respectively. No record of pre-Variscan thermal events is preserved in either the hornblende or muscovite argon systems; however, the widespread occurrence of extraneous argon components suggest a pre-Variscan stage of tectonothermal development. The near concordancy of the hornblende and muscovite cooling ages suggest relatively rapid cooling through the contrasting argon closure temperatures, and indicate that relatively high crustal levels had likely been attained during the Early Carboniferous." @default.
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- W2005816077 date "1992-08-01" @default.
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- W2005816077 title "Chronology of late Paleozoic tectonothermal activity in the southeastern Bohemian Massif, Austria (Moldanubian and Moravo-Silesian zones): 40Ar/39Ar mineral age controls" @default.
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- W2005816077 doi "https://doi.org/10.1016/0040-1951(92)90132-p" @default.
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