Zircon typology and chemistry of the granitoids from central anatolia, Turkey

Köksal, Serhat
This thesis investigates the morphological, chemical and growth characteristics of zircon mineral in relation with the granitoid petrology. Physical and chemical variations recorded within zircon crystals during evolution of the Central Anatolian Granitoids are discussed. The thesis focuses on twelve granitoid samples from the Ekecikdag, Agaçören and Terlemez regions from western part of central Anatolia. These granitoids are differentiated into S- and H-type granitoids on the basis of field, petrographical and whole-rock geochemical aspects. In granitoids concerned, zircon is associated with biotite, allanite and plagioclase, and zircon populations mainly comprise P- and S-type zircon crystals, with rare G-, L- and J-types. Typology method combined with cathodoluminescence imaging revealed that S- and H-type granitoids show intrusive aluminous autochthonous and hybrid character, respectively. Zircons generally have euhedral to subhedral cores exhibiting zoning, although sometimes faint, but inherent and embayed cores also exist. Large scale, first order, and/or small-scale second order oscillatory zoning and effects of late stage recrystallization are observed within zircon crystals. Multi-corrosion zones within zircons are characterized by sharp changes in crystal forms with decreased Zr and Si, and increased U, Th and REE+Y contents, beside infrequent increase in Hf, Sc, Ta, Ti, Ca, Al and Fe elements. These zones are interpreted to be formed by transient heating of the resident felsic magma due to mafic melt contribution, at the time of mixing/mingling processes of the H-type granitoids, and then zircons re-grow in magma source reflecting a mafic character. Corrosion stages within zircons of S-type granitoids, on the other hand, were probably formed by mantle-derived melts producing heat for resorption of zircons without direct contribution.


Mineral mapping in Oymaağaç (Beypazarı)-Ankara) Granitoid by remote sensing techniques
Pekesin, Burcu Fatma; Toprak, Vedat; Department of Geological Engineering (2005)
The aim of this study is to extract information about mineral distribution and percentages of Oymaagaç granitoid (Beypazari-Ankara) by using remote sensing techniques. Two methods are applied during the studies which are spectral analysis and Crosta techniques. Spectral measurements are done for fresh and weathered samples collected at 32 locations. Mineral percentages are calculated using spectral mixture analysis for each sample by considering main, accessory and secondary mineral content of granodiorite....
Mineralogical, petrographical and geochemical properties of zeolite bearing tuffs in nw Anatolia (Turkey)
Özen, Sevgi; Göncüoğlu, Mehmet Cemal; Department of Geological Engineering (2008)
The purpose of this study is to understand the geological, petrographical, mineralogical and geochemical characteristics of analcime-bearing tuffs in the Biga Peninsula and to determine formation process of these tuffs. The study area lies between Ayvacık and Küçükkuyu. The rock units are pre-Eocene basement rocks, Miocene Behram Volcanics (Arıklı Tuff, andesite, andesitic agglomerate), Pliocene volcanics, Miocene lacustrine sediments (Küçükkuyu Formation) and Quaternary alluvium. Analcimes which are found ...
Zircon typologies and internal structures as petrogenetic indicators in contrasting granitoid types from central Anatolia, Turkey
Köksal, Serhat; Göncüoğlu, Mehmet Cemal; Toksoy Köksal, Fatma (2008-07-01)
The external zircon morphology of granitoid rocks is combined with internal structures studied by cathodoluminescence imaging, to test the classic 'Pupin method' against geological and geochemical evidence for the origin and evolution of granitic rocks.
Kinetic analysis of in situ combustion processes with thermogravimetric and differential thermogravimetric analysis and reaction tube experiments
Kök, Mustafa Verşan (1995-01-01)
This research comprises the determination of kinetic parameters of in situ combustion processes by reaction tube and thermal (thermogravimetric analysis (TGA)/differential thermogravimetric analysis (DTGA)) experiments. A previously developed laboratory model and a Du Pont 9900 thermalanalyzer unit were used to run the experiments. Three reaction regions for combustion of crude oil in porous media were observed in the reaction tube and TGA/DTGA experiments and are defined as low temperature oxidation, fuel ...
The cultic landscapes of Phrygia
Özarslan, Yasemin; Summers, Geoffrey; Department of Settlement Archaeology (2010)
This thesis examines Phrygian cultic sites in Western Phrygia from the perspective of landscape using a range of Geographical Information Systems (GIS) analyses. More specifically, it explores spatial relationships between these cultic sites and the regional geographical context with reference to certain environmental and cultural parameters. These include topography, geology, and distance to settlements, hilltop sites, and ancient roads. A total of 30 Phrygian cultic sites form the primary archaeological e...
Citation Formats
S. Köksal, “Zircon typology and chemistry of the granitoids from central anatolia, Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2005.