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Tracing the cryptic Sardic (Ordovician) metamorphism across Alpine Europe: the Krndija region in the Slavonian Mountains, Croatia

Mayer, B. Starijaš; Zeh, A. 1; Krenn, E.; Gerdes, A.; Finger, F.
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Results of a combined petrological, geochemical and geochronological study suggest that metasedimentary rock units in the Krndija region of the Slavonian Mountains, Croatia, were affected by at least three major tectonometamorphic imprints: during the Middle Ordovician (Sardic event), the early Carboniferous (Variscan event), and the Cretaceous (Alpine event). All three metamorphic phases are established by electron microprobe-based in-situ U–Th–Pb dating of monazite grains. The Sardic metamorphic event is additionally confirmed by a precise Lu–Hf garnet-whole-rock isochron age of 466.0 ± 2.3 Ma. Taken together, the data unveil a relatively large and well-preserved piece of the cryptic Sardic orogen in central Krndija, that we name the Kutjevo Zone. A Sardic subduction-related metamorphic event (ca. 540-580 ℃, 8–11 kbar) at ca. 466 Ma is manifested in the mineral paragenesis Ca-rich garnet plus rutile. A low degree of retrograde reequilibration suggests a subsequent fast exhumation. Low-Ca cores in some garnets and staurolite relics record a pre-HP metamorphic event that involves isobaric heating from 570 to 610 ℃ at ~ 7 kbar. We attribute this (so far undated) event to mid-crustal contact metamorphism caused by early Sardic magmatism. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000155750
Veröffentlicht am 10.02.2023
Originalveröffentlichung
DOI: 10.1007/s00531-022-02282-2
Scopus
Zitationen: 4
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Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1437-3254, 0016-7835, 1432-1149, 1437-3262
KITopen-ID: 1000155750
Erschienen in International Journal of Earth Sciences
Verlag Springer-Verlag
Vorab online veröffentlicht am 21.01.2023
Schlagwörter Slavonian Mountains, Sardic orogeny, Ordovician metamorphism, Variscan metamorphism, Alpine metamorphism, Gondwana margin
Nachgewiesen in Web of Science
Scopus
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