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Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)

Jiri Konopasek, Robert Anczkiewicz, Petr Jerabek, Fernando Corfu and Eliska Zackova
Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)
Journal of the Geological Society of London (November 2018) 176 (3): 492-504


Isotopic dating of minerals from high-pressure rocks exposed along the northern Saxothuringian paleo-suture in the Bohemian Massif revealed a diachronous metamorphism of various rock types now associated within thrust sheets representing the Devonian-Carboniferous subduction-accretionary complex. Blueschists of the middle thrust sheet yielded a Lu-Hf garnet-whole rock age of 363.9 + or - 1.3 Ma. The blueschists occur within garnet-free phyllites. Monazite extracted from this rock-type yielded a U-Pb ID-TIMS age of 336.5 + or - 0.5 Ma. Garnet-bearing micaschist of the lower thrust sheet contains monazite, which yielded a U-Pb SIMS age of 341 + or - 3 Ma, equivalent to Lu-Hf garnet-whole rock ages of 344.5 + or - 1.3 and 342 + or - 7 Ma obtained from the same rock type. Existing tectonic models of the Bohemian Massif assume that the period of oceanic subduction was terminated at c. 380-375 Ma by the arrival of an attenuated Saxothuringian continental crust, which was partly subducted underneath the overriding Tepla-Barrandian Domain. However, our data suggest that the initial collision was probably caused by arrival of a smaller crustal block present within the Saxothuringian oceanic domain. After its subduction and relamination, the oceanic subduction was re-established and terminated by later collision of the Saxothuringian passive margin at c. 345-335 Ma.

ISSN: 0016-7649
EISSN: 2041-479X
Serial Title: Journal of the Geological Society of London
Serial Volume: 176
Serial Issue: 3
Title: Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)
Affiliation: University of Tromso-The Arctic University of Norway, Department of Geosciences, Tromso, Norway
Pages: 492-504
Published: 20181120
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 94
Accession Number: 2019-002304
Categories: GeochronologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 4 tables, geol. sketch maps
N50°40'00" - N50°45'00", E15°19'60" - E15°49'60"
Secondary Affiliation: Polish Academy of Sciences, Institute of Geological Sciences, POL, PolandCharles University, CZE, Czech RepublicUniversity of Oslo, NOR, NorwayCzech Geological Survey, CZE, Czech Republic
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201903
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