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First (super 40) Ar/ (super 39) Ar age constraints for the Caledonian evolution of the Trans-European suture zone in NE Germany

R. D. Dallmeyer, U. Giese, U. Glasmacher and W. Pickel
First (super 40) Ar/ (super 39) Ar age constraints for the Caledonian evolution of the Trans-European suture zone in NE Germany
Journal of the Geological Society of London (March 1999) 156, Part 2: 279-290


From three Rugen boreholes (G14, Rugen 5, Loissin 1) across the Caledonian deformation front four Lower Palaeozoic slate samples and three detrital muscovite concentrates from associated sandstones have been analysed by (super 40) Ar/ (super 39) Ar analysis. Microprobe analysis of the detrital muscovites show homogeneous, but distinct chemical compositions for each concentrate. Particulate organic matter reflectance and illite crystallinity indicate that all the analysed whole-rock samples have experienced anchizonal metamorphic conditions. (super 40) Ar/ (super 39) Ar analysis of the samples from the G14 and Loissin 1 wells give almost identical results. Muscovite concentrates define plateau ages of c. 830 Ma and show an isotopic rejuvenation of low-temperature increments around 440 Ma. Whole-rock slate samples give plateau ages of c. 440 Ma and c. 427 Ma. Isotopic rejuvenation in the low-temperature increments prior to 350 Ma in the Loissin 1 sample can be attributed to the Permo-Carboniferous volcanism which is known from this borehole. In contrast, samples from the borehole Rugen 5 show a different isotope pattern. A muscovite concentrate defines a plateau age of 609 Ma. Two whole rock slate samples give internally discordant but identical (super 40) Ar/ (super 39) Ar spectra with consistent isotopic rejuvenation from high- to low-temperature increments from 510 Ma to 420 Ma. While for the G14 and Loissin 1 sandstone samples a Baltica-derived provenance can be assumed, greywackes of Rugen 5 indicate a Cadomian-influenced Perigondwanan detrital source. According to the results of whole-rock slate samples the main Caledonian tectonothermal event in NE-Germany occurred around the Ordovician-Silurian boundary or in the early Silurian (450-425 Ma). From these data the Rugen Palaeozoic appears as an allochthonous Caledonian nappe complex which has been thrust much further onto the Baltic shield than previously thought.

ISSN: 0016-7649
EISSN: 2041-479X
Serial Title: Journal of the Geological Society of London
Serial Volume: 156, Part 2
Title: First (super 40) Ar/ (super 39) Ar age constraints for the Caledonian evolution of the Trans-European suture zone in NE Germany
Affiliation: University of Georgia, Department of Geology, Athens, GA, United States
Pages: 279-290
Published: 199903
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 52
Accession Number: 1999-030542
Categories: GeochronologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 tables, geol. sketch map
N54°13'00" - N54°42'00", E13°05'60" - E13°46'00"
Secondary Affiliation: Martin-Luther-Universitaet Halle-Wittenberg, DEU, Federal Republic of GermanyRWTH Aachen, DEU, Federal Republic of Germany
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199911
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