TETHYANEURASIANMETALLOGENICBELT:RELATIONSOFMINERALASSOCIATIONSANDTHEIRTECTONICSETTING

TheTethyanEurasianmetallogenicbelt(TEMB)wasformedduringMesozoicandpost-MesozoictimesintheareaoftheformerTethyanoceanalongthesouthernmarginofEurasia,flankedonthesouthbytheAfro-ArabianandIndianplates.TheTEMBisofglobalsize――almost10,000kmlong――anditcanbecomparedwiththeCircumPacificbelt;butitdiffersinmanyrespects,andischaracterizedbymanyspecificmetallogenicfeatures.ThegeneraltectonicevolutionofthedomainwheretheTEMBwasformediscloselyconnectdwiththedevelopmentoftheTethysoceans:thePalaeo-Tethysclosure,andopeningandevolutionoftheNeo-Tethys,itsmarginsandislandarcs,microplates,convergence.closing.weldingofmicroplateswithEurasia,subductionofoceaniccrust(s),aswellascollisionofcontinents,continent-islandarccollisionandunderthrustingofcontinentalcrusts,accompaniedbymagmaticcomplexesandvolcano-intrusivebelts.Theemplacementoforedepositsisrelatedtoadefinitetimeinterval,andaspecifictectonicsettingsuchas:1.IntracontinentalriftingaJongthenorthernmarginofGondwanaJandand/orwithinaJreadyseparatedfragmentsisthesettingof(1)volcano-sedimentaryandvolcanogenichydrothermaldeposits;(2)lowtemperaturecarbonatednostednydrothermaldepositsrelatedtomarginalseas;(3)skarndeposits;(4)carbonatiedeposits.2.Mineralizationassociatedwithophiolites(magmaticandvolcano-sedimentarydeposits).3.Mineralizationinsubduction-relatedsettingsinvolves(1)porphyrycopperdeposits;(2)volcanogenicandvolcano-sedimentarydeposits;(3)skarndeposits;(4)greisendeposits.4.Mineralizationincontinent-continentcollisionsettingisassociatedwitnS-granitoidsemplacedintueoverridingcontinentalplatefollowingcontinent-continentcollision.5.Post-collisionmagmaticactivityandmineralizationassociatedwiththecalc-alkalinecomplexes(tnePb-Zn,Sb,Au,Agdominate).