Tectonometamorphic evolution of the Elekdag metaophiolite,Turkey: A petrographic and geochemical study
Başlık çevirisi mevcut değil.
- Tez No: 796612
- Danışmanlar: DR. THOMAS MUELLER, PROF. DR. SANDRA PİAZOLO
- Tez Türü: Yüksek Lisans
- Konular: Çevre Mühendisliği, Environmental Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2019
- Dil: İngilizce
- Üniversite: University of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 123
Özet
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Özet (Çeviri)
The High-pressure/low-temperature eclogite facies rocks are broadly considered to represent emplaced materials of the subducted slab of the surface layer in the crust. Thus, the studies of the High-pressure/low-temperature metamorphic rocks can bring to light crucial information about the PT characteristics of the subducted rocks at the great depth in subduction zones. The Elekdag metaophiolite slice (Anatolian microplate) display a former oceanic (Tethyan) subduction zone complex features. Elekdag metaophiolite consist of gabbroic-ultrabasic protolith prior to subduction, and tectonometamorphic evolution of those units contribute to the formation of Elekdag massif. Elekdag massif contains different HP-LT metaophiolitic packs that were divided by the thrust planes and those units display significant tectonic and metamorphic differences. This project is about to relate the metamorphic and deformation history of these units in the context of the formation of the Elekdag metaophiolitic slice. The study field was divided into the three different outcrops in terms of the deformation intensity: a low deformed Outcrop (5-1a), an intermediate deformed Outcrop (2-1b) and a high deformed Outcrop (4-1c). During the field studies, 5 serpentinite-garnet bearing greenschist imbrication were observed. The imbrication were distinguished by the thrust plane from each other. The geochemistry (XRF and EDS based SEM), petrographical and microstructural (thin sections), Mineral chemistry and Geothermobarometry (Microprobe) data of those different outcrops are compared. Subducted ophiolite slab metamorphosed at High-pressure-Low temperature conditions. The peak metamorphic temperature of the garnet-bearing greenschist Outcrop 2-1b constrained to 4460 -4620C and 3210 -3350C for Outcrop 4-1c (Highly deformed). In this PT conditions the gabbroic rocks were eclogitized and then during the exhumation, the eclogite rocks were overprinted by greenschist facies minerals such as chlorite and epidote. The psedosection models were carried out for the lower grade PT of the Outcrop 2-1b (8-11 kbar, 5000 -5500C) and 4-1c (8-10 kbar, 4500 -5500C).
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