Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

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dc.authoridTunc, I. Onur/0000-0002-4273-9175
dc.contributor.authorSengun, F.
dc.contributor.authorDavis, P. B.
dc.contributor.authorTunc, I. O.
dc.contributor.authorYigitbas, E.
dc.date.accessioned2025-01-27T20:45:29Z
dc.date.available2025-01-27T20:45:29Z
dc.date.issued2012
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe Biga Peninsula in northwest Turkey contains high-pressure metabasic eclogite that occur in two localities; as lenses within a 2 km long, 500 m thick quartz-phengite schist slice that is in turn found in the greenschist-facies metasedimentary rocks of the Camlica metamorphics, in Camlica area, and in two north-south elongated eclogites occurring as a tectonic slice between Kazdag Massif and Cetmi Group, in Cetmi area. The P-T conditions under which these two exposures of eclogites formed are important to quantify the tectonic processes of subduction, exhumation and emplacement that high-pressure rocks of the Biga Peninsula record. New geochemical data suggest that both protoliths were N-type MORB basalt with high TiO2 and K2O-Na2O content and Nb/Y ratios. Most eclogite samples have tholeiitic signatures volcanic arc settings. Sigma REE abundances range from 47.55 to 107.4 ppm. Europium anomalies are slightly variable (Eu/Eu* = 0.9-1.1) and trace element contents are similar to typical MORB based on tectonic discrimination diagrams. All eclogite protoliths were probably derived from depleted mantle source, modified by fluids within the subduction zone. The high-P mineral assemblage in eclogites from both regions is omphacite + garnet + glaucophane + phengite + epidote + zoisite + quartz. The inclusions in garnet are glaucophane, quartz, phengite, Ca-amphibole and rutile. P-T conditions are similar to each other and constrained at 550-700 degrees C and 16-24 kbar. Geochemical data and mineral chemistry indicate that the eclogites in the Biga Peninsula represent oceanic crust processed at significant depths (50-80 km) within the subduction channel and were juxtaposed with greenschist facies as a tectonic slice in the accretionary complex at higher structural levels.
dc.description.sponsorshipTUBITAK [CAYDAG 108Y232, CAYDAG 110Y281]
dc.description.sponsorshipThis study was supported by the TUBITAK project CAYDAG 108Y232 and CAYDAG 110Y281 and include some results of them. We thank Donna Whitney, Anette von der Handt and Osman Candan for microprobe analyses. The constructive criticism of Nicolay Bonev and Roland Oberhansli is greatly appreciated.
dc.identifier.doi10.1080/09853111.2013.858954
dc.identifier.endpage266
dc.identifier.issn0985-3111
dc.identifier.issn1778-3593
dc.identifier.issue3-4
dc.identifier.scopus2-s2.0-84902870573
dc.identifier.scopusqualityN/A
dc.identifier.startpage248
dc.identifier.urihttps://doi.org/10.1080/09853111.2013.858954
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24596
dc.identifier.volume25
dc.identifier.wosWOS:000208975400010
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTaylor & Francis Ltd
dc.relation.ispartofGeodinamica Acta
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjecteclogite
dc.subjectHP metamorphism
dc.subjectpseudo-section
dc.subjectBiga Peninsula
dc.subjectNW Turkey
dc.titlePetrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey
dc.typeArticle

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