Zr-in-rutile thermometry of eclogites from the Karakaya Complex in NW Turkey: Implications for rutile growth during subduction zone metamorphism

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dc.contributor.authorSengun, Firat
dc.date.accessioned2025-01-27T21:03:34Z
dc.date.available2025-01-27T21:03:34Z
dc.date.issued2017
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractEclogites occur as a tectonic slice within a metabasite-phyllite-marble unit of the Karakaya Complex in northwest Turkey. The high-pressure mineral assemblage in eclogite is mainly composed of garnet + omphacite + glaucophane + epidote + quartz. Trace element characteristics of rutile and Zr-in-rutile temperatures were determined for eclogites from the Karakaya Complex. Core-rim analyses of rutile grains yield remarkable trace element zoning with lower contents of Zr, Nb and Ta in the core than in the rim. The variations in Zr, Nb and Ta can be ascribed to growth zoning rather than diffusion effects. The Nb/Ta and Zr/Hf ratios increase with a decrease in Ta and Hf contents, which could be ascribed to the effect of metamorphic dehydration in subduction zones on rutile Nb/Ta differentiation. The rutile grains from eclogites in the Karakaya Complex are dominated by subchondritic Nb/Ta and Zr/Hf ratios. It can be noted that subchondritic Nb/Ta may record rutile growth from local sinks of aqueous fluids from metamorphic dehydration. The Zr contents of all rutile grains range between 81 and 160 ppm with an average of 123 ppm. The Zr-in-rutile thermometry yields temperatures of 559-604 degrees C with an average temperature of 585 degrees C for eclogites from the Karakaya Complex. This average temperature suggests growth temperature of rutile before peak pressure during the subduction. However, some rutile grains have higher Zr contents in the outermost rims compared to the core. Zr-in-rutile temperatures of the rims are about 20 degrees C higher than those of the cores. This suggests that the outermost rims would have grown from a distinct fluid at higher temperatures than that of the cores. Moreover, Zr contents and calculated temperatures in both inclusion rutile and matrix rutile from eclogites are identical, which suggests that eclogites within the Karakaya Complex belong to the same tectonic slice and underwent similar metamorphic evolution. (C) 2017 Elsevier GmbH. All rights reserved.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [114Y834]; Canakkale Onsekiz Mart University Scientific Research Coordination Unit [FBA-702-2016]
dc.description.sponsorshipThis work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) grant 114Y834 and Canakkale Onsekiz Mart University Scientific Research Coordination Unit (Project number: FBA-702-2016). I warmly thank Thomas Zack for his help with the LA-ICPMS measurements. The author thanks two anonymous reviewers for their helpful suggestions, D. Upadhyay for careful editorial handling.
dc.identifier.doi10.1016/j.chemer.2017.01.008
dc.identifier.endpage104
dc.identifier.issn1611-5864
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85011025185
dc.identifier.scopusqualityQ1
dc.identifier.startpage95
dc.identifier.urihttps://doi.org/10.1016/j.chemer.2017.01.008
dc.identifier.urihttps://hdl.handle.net/20.500.12428/27342
dc.identifier.volume77
dc.identifier.wosWOS:000401042700006
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Gmbh
dc.relation.ispartofChemie Der Erde-Geochemistry
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectRutile
dc.subjectZr-in rutile thermometry
dc.subjectEclogite
dc.subjectKarakaya complex
dc.subjectNW Turkey
dc.titleZr-in-rutile thermometry of eclogites from the Karakaya Complex in NW Turkey: Implications for rutile growth during subduction zone metamorphism
dc.typeArticle

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