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首页> 中文期刊> 《地学前缘：英文版》 >Comparisons of the suture zones along a geotraverse from the Scythian Platform to the Arabian Platform

Comparisons of the suture zones along a geotraverse from the Scythian Platform to the Arabian Platform

         
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The area from the Greater Caucasus to the southeast Turkey is characterized and shaped by several major continental blocks.These are Scythian Platform,PontianeTranscaucasus Continent-Arc System(PTCAS),the AnatolianeIranian and the Arabian Platforms.The aim of this paper is to define these continental blocks and describe and also compare their boundary relationships along the suture zones.The Scythian Platform displays the evidence of the Hercynian and Alpine orogens.This platform is separated from the PTCAS by the Greater Caucasus Suture Zone.The incipient collision began along this suture zone before middleelate Carboniferous whereas the final collision occurred before Oligocene.The PTCAS can be divided into four structural units:(1) the Georgian Blockenorthern part of the PontianeTranscaucasian island-arc,(2) the southern and eastern Black Sea CoasteAdjaraeTrialeti Unit,(3) the ArtvineBolnisi Unit,comprising the northern part of the southern Transcaucasus,and(4) the Imbricated BayburteGarabagh Unit.The PTCAS could be separated from the AnatolianeIranian Platform by the North AnatolianeLesser Caucasus Suture(NALCS) zone.The initial collision was developed in this suture zone during Senonianeearly Eocene and final collision before middle Eocene or OligoceneeMiocene.The AnatolianeIranian Platform(AIP) is made up of the Tauride Platform and its metamorphic equivalents together with Iranian Platform.It could be separated from the Arabian Platform by the Southeastern Anatolian Suture(SEAS) zone.The collision ended before late Miocene along this suture zone.The southernmost continental block of the geotraverse is the Arabian Platform,which constitutes the northern part of the ArabianeAfrican Plate.This platform includes a sequence from the Precambrian felsic volcanic and clastic rocks to the Campanianeearly Maastrichtian flyschoidal clastics.All the suture zones include MORB and SSZ-types ophiolites in different ages.However,the ages of the suture zones and the crustal thicknesses along the suture zones are different,as the age becoming younger,the thickness decreasing from north to south.The emplacements of the ophiolites have similar pattern of a flower structure,reflecting both the north- and south-dipping overthrusts along the suture zones.

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