Criteria for Recognit

Lithostratigraphic Classification of VMS DepositsType Typical Facies Petrochemical Assemblages Tectonic Setting(Inferred for Archeanexamples)MaficDominantly mafic flows and, 10% felsicflows/domes. Mafic sills and dikescommon, minor argillite and chert.(Ophiolitic assemblages)MORB- LOTI-boninite basaltsMature intra-oceanicbackarcsExamplesSouth Urals, RussiaCentral Newfoundland, CanadaTroodos, CyprusSemail, OmanPontides, Turkey and AlbaniaPelitic-maficMafic sills, subordinate flows withargillite, carbonaceous argillite subequalor dominant, minor chert and trace toabsent felsic volcanic facies.MORB, EMORB basalts,Alkaline basalt (OIB)Sedimented mid-oceanridges, transforms orbackarcsOutokumpu, FinlandLabrador Trough, Windy Craggy, CanadaMid and South Urals, RussiaBesshi district, JapanBimodal-mafic Dominantly mafic flows with up to 25%felsic flows/domes and subordinatefelsic/mafic volcaniclastic rocks andterrigenous sedimentary rocks (wackes,argillites)Bimodal-felsic Felsic flows/domes, volcaniclastic rocksdominant with 10-40% mafic flows andsills and /= FII rhyolitesMORB, OIB-Alkalic basaltFII (