Yazar "Koralay, Tamer" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Comparison of the collision and extensional related mafic intrusive rocks within central anatolia, Turkey
    (International Multidisciplinary Scientific Geoconference, 2019) Deniz, Kıymet; Kadıoğlu, Yusuf Ka?an; Koralay, Tamer; Güllü, Bahattin
    The closure of Neotethys induced collision and extension related basic magmatism within the Central Anatolia during the late Cretaceous and Early Paleogene. The products of the basic magmatism are alkaline and tholeiitic in character. The temporal and spatial evolution of the basic magma within the Central Anatolia has a great role in the interpretation of magmato–tectonic evolution of the region. The lack of radiometric age for the mafic magmatic rocks let to discussion in the explanation of the nature of these magmatism. The recent study deal with detail mineralogical and petrographic studies with spectroscopically methods. The evaluation of plagioclase, amphibole, pyroxene and biotite by using the Raman confocal spectroscopy and Electron microprobe methods. Mafic magmatic rocks have a wide exposure with different colour and textures in the Central Anatolia. In this study, Hacıibrahimuşağı, Gömük, Akçakent and Hamit gabbros are selected for the purpose of the investigation of this research. Hacıibrahimuşağı and Gömük gabbros are mainly composed of plagioclase, amphibole, pyroxene with lack amount of biotite. The plagioclase compositions range from oligoclase to bytownite. The amphiboles are mainly hornblende and the pyroxenes are diopside in compositions. Akçakent and Hamit gabbros are mainly composed of plagioclase, nepheline, and pyroxene with lack amount of amphibole and cancrinite. Thermobarometry calculations from amphiboles of Hacıibrahimuşağı gabbros are ranging from 798 up to 944°C and 4.2–1.1 kbar with 15.9–4.3 km emplacement depth. Furthermore, the formation of the pyroxene minerals of these rocks are 1388-1464°C and 19.9-25.6 kbar with 91-98 km emplacement depth. Thermobarometry calculations from pyroxene of Akçakent and Hamit gabbros are ranging from 1083 up to 1270°C and 1.8-20.7 kbar with 7-80 km emplacement depth of these pyroxenes. All the detail mineralogical, petrographical and thermobarometry studies reveal that the Hacıibrahimuşağı and Gömük gabbros are tholeiitic in nature and formed due to the Inner Tauride Ocean collision in the Central Anatolia. However, the Akçakent and Hamit gabbros are alkaline in nature and formed due to the extensional of the Anatolian Plate after the collision during Late Cretaceous and Early Paleogene in the region.
  • [ X ]
    Öğe
    Mineral chemistry of ophiolitic gabbros within central anatolia: Hirfanli dam gabbros
    (International Multidisciplinary Scientific Geoconference, 2019) Koralay, Tamer; Kadıoğlu, Yusuf Ka?an; Deniz, Kıymet; Güllü, Bahattin
    The tectonic evolution of the magmatic rocks the Central Anatolia (CA) began at the late Mesozoic with closure of Neotethys in the region. The Central Anatolia has experienced several magmatic events including felsic and mafic intrusions originated from collisional and/or extensional tectonic events. The felsic magmatism of the CA are well reported and studied, whereas the origin and temporal distributions of the mafic magmatism are still controversial. This study includes the preliminary results of the TÜBİTAK project (116Y240) which aims to determine the mineralogical-petrographical, mineral chemistry and whole rock geochemistry of the Hirfanlı Dam gabbroic rocks in CA. The gabbroic rocks has dark to light green in color and fine-to-coarse grained crystal size. They are highly fractured, cracked and usually cut by fine crystalline gabbro and diabase dikes. According to the microscopic investigations, Hirfanlı Dam gabbroic rocks have holocrystalline granular and/or cumulate textures and mainly consist of plagioclase + pyroxene + amphibole + Fe-Ti oxides + chlorite + epidotite in composition. In addition, various alteration products such as uralitization, chloritization, epidotization, and carbonatization can be observed. These results are also supported by the Confocal Raman Spectrometry (CRS). Whole rock geochemistry of gabbroic rocks are characterized by relatively high Mg# (36.1±8.94) with remarkably low (Na2O+K2O) (1.56±0.92 wt.%), Zr (4.36±2.85 ppm), Th (0.64±0.64 ppm) contents. Moreover they have high TiO2 (1.13±0.75 wt.%), Fe2O3 (13.73±4.67 wt.%), CaO (12.27±0.74 wt.%) and V (867±801 ppm) contents. The gabbroic rocks are low-K tholeiite and show N-MORB in character. They display enrichment in LILE with relative to HFSE in MORB normalized multi-element diagrams. In this diagram, they exhibit depletions in Sr, Nb, Zr, TiO2 and Y as characteristics of subduction-related magmas. As a result, the petrographic and geochemical results suggest that gabbroic rocks of Hirfanlı Dam are the most probably products of supra-subduction ophiolite and may derived from N-MORB magma sources.
  • [ X ]
    Öğe
    Raman characteristics of gucunkaya (Aksaray) gabbroic rocks, central Anatolia-Turkey
    (International Multidisciplinary Scientific Geoconference, 2019) Güllü, Bahattin; Kadıoğlu, Yusuf Ka?an; Koralay, Tamer; Deniz, Kıymet
    The Central Anatolia Basement Units (CABU) have several mafic and felsic characterized magmatic systems which are associated with the closure of the Neotethys during the Late Mesozoic. Gucunkaya gabbro is located to the southern part of Ağaçören Intrusive to the North East of Aksaray in Central Anatolia. Field and petrographic studies show that the mafic products of the area are mainly composed of two main units as a gabro and diorite. The gabbro and the diorite cut by fine crystalline gabbro, diorite porphyry, fine crystalline diorite and diabase dykes. The plagioclases (An51-An93) + hornblende + augite ± quartz ± epidotite ± calcite ± titanite and opaque minerals form the main compositions of the Gucunkaya gabbro, and they are ranging from pyroxene-hornblende gabbro to diorite in composition. The MORB normalized elemental patterns of the gabbro and mafic dykes reveal enrichment in LIL element and depletion in HFS elements. Confocal Raman Spectroscopy (CRS) was investigated from amphibole and plagioclase minerals in the Gucunkaya gabbroic rocks. The CRS studies, was determined that the amphiboles are in the composition of actinolite and the plagioclases are in the composition of labradorite and anorthite. The CRS studies show that actinolites have a Raman shift value of 218.6, 385.76, 531.81, 677.46 and 1046.5 cm-1. The 156.06, 174.02, 221.69, 389.48, 525.06, 668.70, 926.26, and 1055.04 cm-1 values of Raman shift observed in the pyroxene minerals reflected the augite composition. On the bases of petrological, geochemical and spectroscopic data of the research area, the products of the Gucunkaya Gabbroic rocks are derived from the mantle products with depletion of the continental crust.