Metamorphic Evolution of the Elekdag Eclogites (Central Pontides)

dc.contributor.advisor Topuz, Gültekin Burlick, Theodore Douglas
dc.contributor.authorID 602141003 tr_TR
dc.contributor.department Solid Earth Sciences en_US
dc.contributor.department Katı Yer Bilimleri tr_TR 2020-10-16T08:13:09Z 2020-10-16T08:13:09Z 2019-01-13
dc.description.abstract The topic of the thesis is focused on the metamorphic and tectonic evolution of high-pressure metamorphic eclogites and by extension, the surrounding meta-lherzolite and serpentinite of the Elekdag Ophiolite within the Central Pontide Mountains of Turkey. The goal of this study is to continue the work of previous authors in better understanding the timing and conditions of metamorphism and their associated tectonic events through field mapping, detailed petrographic and microstructural analysis, investigation of stable equilibrium assemblages with wavelength-dispersive x-ray, energy-dispersive, angle-selective backscatter spectroscopies coupled with isochemical phase equilibria diagrams and conventional cation exchange geothermobarometry analysis. The Elekdag Ophiolite and other related ophiolites in the Central Pontide Mountains of Northern Anatolia are interpreted as being mantle and crust accretionary prisms which formed along the southern edge of the Laurasian Supercontinent prior to the closure of the Paleotethys Ocean and the Formation of Pangea together with the Gondwana Supercontinent. Elekdag is closely associated with the larger Cangaldag Island Arc and the larger Domuzdag HP mélange. During subduction in the Cretaceous the Elekdag Complex experienced up to eclogite-facies metamorphic conditions. Metamorphic rocks present in the study area include typical ophiolite assemblages with the addition of HP-LT blueschists, greenschist facies mineral assemblages, serpentinite, mica schists and HP-MT eclogites. The HP-LT units are contained within lenses along the boundary of the serpentinite body and are also in contact with the neighboring Domuzdag Complex. Typical mineral assemblages of the eclogites are garnet + omphacite + glaucophane + clinozoisite + white mica ± lawsonite ± tourmaline ± rutile. Blueschist mineral assemblages consist of garnet + glaucophane + clinozoisite + white mica + chlorite ± quartz ± lawsonite ± rutile. Most primary mineral assemblages have been heavily overprinted with lower grade hydrous mineral assemblages. Retrogression occurred due to lower pressures and temperatures during exhumation and the extensive infiltration of hydrothermal fluids within the rocks characterized by chlorite. Typical retrograde phases are glaucophane (for eclogites), as well as the common greenschist facies assemblage of chlorite + albite + clinozoisite ± stilpnomelane. The metabasite samples investigated show mid-ocean ridge basalt affinities (MORB) with at least one protolith being a cumulate. Constraints on maximum pressures and temperatures of metamorphism, and by extent depth of subduction and subsequent exhumation were inferred based upon geochemical and petrographic analysis. Two distinct samples were modeled in isochemical phase diagrams. One, a cumulate metabasite yielded maximum PT conditions of 21±2 kbar at 360 ± 50 °C based upon garnet and phengite compositional isopleths as well as a maximum temperature of metamorphism of 400 °C according to Fe/Mg cation exchange thermometry between garnet and clinopyroxene. A second modeled sample yielded lower pressure ranges of 10±2 kbar at a higher temperature of 500 °C which is in contrast to similarly thermometry results which give maximum temperatures of ~450 °C. en_US M.Sc. en_US Yüksek Lisans tr_TR
dc.language.iso eng en_US
dc.publisher Avrasya Yer Bilimleri Enstitüsü tr_TR
dc.publisher Eurasia Institute of Earth Sciences en_US
dc.rights All works uploaded to the institutional repository are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. en_US
dc.rights Kurumsal arşive yüklenen tüm eserler telif hakkı ile korunmaktadır. Bunlar, bu kaynak üzerinden herhangi bir amaçla görüntülenebilir, ancak yazılı izin alınmadan herhangi bir biçimde yeniden oluşturulması veya dağıtılması yasaklanmıştır. tr_TR
dc.subject Elekdag, Eclogite tr_TR
dc.subject Elekdağ, Ofiloyit tr_TR
dc.title Metamorphic Evolution of the Elekdag Eclogites (Central Pontides) en_US
dc.title.alternative Elekdağ Ofiyolitlerinin (OrtaPontidler) Metamorfik Evrimi tr_TR
dc.type Thesis en_US
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