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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: 3
Web of Science
Zitationen: 3
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Zitationen: 3
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
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Scopus
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