Metamorphic evolution of blueschists of the Altinekin Complex, Konya area, south central Turkey

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dc.contributor.authorDroop, GTR
dc.contributor.authorKarakaya, MQ
dc.contributor.authorEren, Y
dc.contributor.authorKarakaya, N
dc.date.accessioned2020-03-26T16:57:30Z
dc.date.available2020-03-26T16:57:30Z
dc.date.issued2005
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractThe Altinekin Complex in south central Turkey forms part of the south-easterly extension of the Tavsanh Zone, a Cretaceous subduction complex formed during the closure of the Neo-Tethys ocean. The protoliths of metamorphic rocks within the Altmekin Complex include peridotites, chromitites, basalts, ferruginous cherts and flysch-facies impure carbonate sediments. Structurally, the complex consists of a stack of thrust slices, with massive ophiolite tectonically overlying a Cretaceous sediment-hosted ophiolitic melange, in turn overlying a sequence of Mesozoic sediments. Rocks within the two lower structural units have undergone blueschist-facies metamorphism. Petrographic, mineral-chemical and thermobarometric studies were undertaken on selected samples of metasedimentary and metabasic rock in order to establish the time relations of deformation and metamorphism and to constrain metamorphic conditions. Microstructures record two phases of plastic deformation, one predating the metamorphic peak, and one postdating it. Estimated peak metamorphic pressures mostly fall in the range 9-11 kbar, corresponding to burial depths of 31-38 km, equivalent to the base of a continental crust of normal thickness. Best-fit peak metamorphic temperatures range from 375 to 450 degrees C. Metamorphic fluids had high H2O:CO2 ratios. Peak metamorphic temperature/depth ratios (T/d values) were low (c. 10-14 degrees C/km), consistent with metamorphism in a subduction zone. Lawsonite-bearing rocks in the southern part of the ophiolitic melange record lower peak temperatures and T/d values than epidote blueschists elsewhere in the unit, hinting that the latter may consist of two or more thrust slices with different metamorphic histories. Differences in peak metamorphic conditions also exist between the ophiolitic melange and the underlying metasediments. Rocks of the Altinekin Complex were subducted to much shallower depths, and experienced higher geothermal gradients, than those of the NW Tavsanli Zone, possibly indicating dramatic lateral variation in subduction style. Retrograde P-T paths in the Altmekin Complex were strongly decompressive, resulting in localized overprinting of epidote blueschists by greenschist-facies assemblages, and of lawsonite blueschists by pumpellyite-facies assemblages. The observation that the second deformation was associated with decompression is consistent with, but not proof of, exhumation by a process that involved deformation of the hanging-wall wedge, such as gravitational spreading, corner flow or buoyancy-driven shallowing of the subduction zone. Copyright (c) 2005 John Wiley & Sons, Ltd.en_US
dc.identifier.doi10.1002/gj.1000en_US
dc.identifier.endpage153en_US
dc.identifier.issn0072-1050en_US
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage127en_US
dc.identifier.urihttps://dx.doi.org/10.1002/gj.1000
dc.identifier.urihttps://hdl.handle.net/20.500.12395/19795
dc.identifier.volume40en_US
dc.identifier.wosWOS:000228710800001en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherWILEY-BLACKWELLen_US
dc.relation.ispartofGEOLOGICAL JOURNALen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectTavsanli zoneen_US
dc.subjectAltinekin Complexen_US
dc.subjectKonyaen_US
dc.subjectmetamorphismen_US
dc.subjectblueschistsen_US
dc.subjectlawsoniteen_US
dc.subjectepidoteen_US
dc.subjectpumpellyiteen_US
dc.subjectP-T pathen_US
dc.subjectTethysen_US
dc.subjectsubductionen_US
dc.subjectexhumationen_US
dc.titleMetamorphic evolution of blueschists of the Altinekin Complex, Konya area, south central Turkeyen_US
dc.typeArticleen_US

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