20.500.12556/DiRROS-15315 Low-grade metamorphic rocks of the Tethys subduction–collision zone in the Medvednica Mt. (NW Croatia) The low-grade metasedimentary rocks of Medvednica Mt. (Northwest Croatia) are associated with ortho-greenschists (metabasalts). The Lower to Upper Triassic age of the protolith of the low-grade metamorphic rocks belonging to the Stari Potok, Adolfovac, Tusti Breg, Bliznec, Mrzljak, and Sljeme lithostratigraphic units is determined on the basis of conodonts and field relationships. The metamorphic age of the Triassic metasedimentary rocks from the Risnjak lithostratigraphic units is assumed to be Jurassic. Petrographic and geochemical analyses of ortho-greenschists point to a tholeiite basic magmatic protolith rock having T-MORB (transitional midocean-ridge basalt) characteristics. The ortho-greenschists of the Sljeme lithostratigraphic unit underwent retrograde metamorphism and show metamorphic zoning from the epidote–amphibolite facies to the lower parts of the greenschist facies. However, the greenschists of the Tusti Breg and Bliznec units are characterized by prograde metamorphism ranging from lower to higher greenschist facies. This metamorphism is associated with Jurassic subduction (165–150 Ma) and closure of the Western Tethys. Retrograde metamorphism took place during the collision of the Adriatic and Eurasian plates in the Lower Cretaceous (125–110 Ma). Mt. Medvednica greenschists prograde–retrograde metamorphism T-MORB subduction–collision Western Tethys true false true Earth Science Institute, Slovak Academy of Sciences Angleški jezik Ni določen Delo ni kategorizirano 2022-07-25 11:08:25 2022-07-25 11:23:12 2022-08-21 03:36:45 0000-00-00 00:00:00 2022 0 0 207-229 no. 3 vol. 73 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 551.7 1335-0552 10.31577/GeolCarp.73.3.3 115991811 GeolCarp_Vol73_No3_207_229.pdf GeolCarp_Vol73_No3_207_229.pdf 1 9383B2E218CCFA5DDD24B41864782CF6 d18818631df4b3d0915836f2adbec58fedc0083dcf6d91b56254c38ff3d9e024 f8fcea8e-17b6-11ed-b6b8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=20174 Geološki zavod Slovenije 0 0 0