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Niskometamorfne metasedimentne stijene na Medvednici (SZ Hrvatska) asocirane su s ortogrin\u0161istima (metabazaltima). Protolitna starost niskometamorfnih stijena litostratigrafskih jedinica Stari potok, Adolfovac, Tusti breg,\u00a0 Bliznec, Mrzljak i Sljeme u rasponu donji do gornji trijas odre\u0111ena je na temelju sadr\u017eaja konodonti i geolo\u0161kih zapa\u017eanja\/istra\u017eivanja, dok se za stijene jedinice Risnjak mo\u017ee pretpostaviti jurska protolitna starost. Petrografske i geokemijske analize ukazuju da su protoliti zelenih orto\u0161kriljavaca bile toleitne bazi\u010dne magmatske stijene koje imaju obilje\u017eja T-MORB. Zeleni orto\u0161kriljavci jedinice Sljeme\u00a0 retrogradno su metamorfozirani i pokazuju metamorfnu zonalnost od epidot-amfibolskog facijesa do ni\u017eih djelova facijesa zelenih \u0161kriljavaca. Me\u0111utim, zeleni \u0161kriljavci jedinice Tusti breg i Bliznec pokazuju progradni tip metamorfizama od ni\u017eeg facijesa zelenih \u0161kriljavaca do vi\u0161eg facijesa zelenih \u0161kriljavaca. Metamorfizam se zbivao tijekom jurske subdukcije od 165 Ma do 150 Ma zatvaranjem zapadnog Tetisa, a retrogradni metamorfizam tijekom kolizije Jadranske plo\u010de i Euroazije u starijoj kredi od 125 Ma do 110 Ma.<\/p>\n