MAÜ GCRIS Standart veritabanının içerik oluşturulması ve kurulumu Research Ecosystems (https://www.researchecosystems.com) tarafından devam etmektedir. Bu süreçte gördüğünüz verilerde eksikler olabilir.

Harita ve Kadastro Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12514/161

Browse

Browsing Harita ve Kadastro Koleksiyonu by Author "Atakul Özdemir, Ayşe"

Filter results by typing the first few letters
Now showing 1 - 4 of 4
  • Thumbnail Image
    Conference Object
    Biostratigraphy and microfacies of the sedimentary sequences within volcano-sedimentary Maden Complex in Southeastern Turkey
    (EGU General Assembly 2021, 2021) Atakul Özdemir, Ayşe; Özkan Altıner, Sevinç; Tancan, Sesil; Özdemir, Yavuz; Mercan, Çağrı; Oyan, Vural; Güleç, Nilgün
    Maden Complex is a volcano-sedimantary unit, mainly composed of shallow and deep marine sedimentary rocks and associated volcanics. Deep marine units of Maden Complex, exposed between Çatak (Van) and Kozluk (Batman) regions have been studied with a combined sedimentological and paleontological approaches. The following species are recorded within the Melefan formation: Morozovella aragonensis, Acarinina collactea, Acarinina cf. esnehensis, Acarinina soldadoensis, Acarinina boudreauxi, Acarinina bullbrooki, Acarinina mckanni, Acarinina pentacamerata, Acarinina cf. pseudosubsphaerica, Acarinina topilensis, Acarinina esnehensis, Chiloguembelina sp., Globanomalina planoconica, Globanomalina australiformis, Globigerinatheka sp., Parasubbotina hagni, Pearsonites broedermanni, Pseudoglobigerinella bolivariana, Planoglobanomalina pseudoalgeriana, Pseudohastigerina wilcoxensis, Subbotina roesnaensis, Subbotina yeguaensis. Based on the defined planktonic foraminiferal species, the unit corresponds to the E7 zone and the depositional age of the formation is proposed as Early Eocene (Ypresian) to Middle Eocene (Lutetian). The deep marine sedimentary sequence mainly consists of pinkish to red colored micritic limestones including shale intercalations. The formation is represented by the pelloidal wackestone-packstone facies and comprises abundant planktonic foraminiferal assemblages.
  • Thumbnail Image
    Article
    Composition, pressure, and temperature of the mantle source region of quaternary nepheline-basanitic lavas in Bitlis Massif, Eastern Anatolia, Turkey: A consequence of melts from Arabian lithospheric mantle
    (Elsevier, 2019) Mercan, Çağrı; Özdemir, Yavuz; Oyan, Vural; Atakul Özdemir, Ayşe
    The Quaternary (0.66–0.63 Ma) nepheline basanites (ne - basanite) are the firstly observed volcanic products of Arabia-Eurasia collision on Bitlis Pötürge Massif. They composed of clinopyroxene, olivine, Ti-magnetite, Cr spinel, and nepheline. The forsterite compositions of olivines range between 73 and 83%, calcic clinopyroxenes show modest variations in Wo48–57-En37–45-Fs5–7 and nephelines occur as minor minerals within the networks of other groundmass minerals. They are characterized by low SiO2 (40.16–41.96 wt%), high MgO contents (8.54–9.73 wt%) and similar Srsingle bondNd isotopic compositions with Arabian Plate volcanics. Mineral and whole rock thermobarometry yield crystallization pressure and a temperature range between 8 and 20 kbar and 1301 °C – 1035 °C respectively. Lavas have high Mg-number (>0.58), high Cr and Ni contents and strong LREE enrichment but depletion in Rb, K, and Pb. Trace elements together with Sr isotopic compositions inferred negligible assimilation of the local upper crustal material. The calculated average pressure and temperature of mantle melting for ne-basanites is 2,85 kbar and 1353 °C respectively. FC3MS (wt% FeO/CaO-3*MgO/SiO2) parameter and melting models using REE data reveal Çatak basanites are products of amphibole and phlogopite bearing metasomatised lithospheric mantle in garnet stability field. They seem to originated from depths of ~ 85 km which corresponds to the base of the Arabian lithosphere in the region.
  • Thumbnail Image
    Conference Object
    Maden Kompleksine ait derin denizel istiflerin planktonik foraminifer toplulukları (Doğu Türkiye)
    (2021) Atakul Özdemir, Ayşe; Özkan Altıner, Sevinç; Özdemir, Yavuz; Mercan, Çağrı; Oyan, Vural; Güleç, Nilgün
    Maden Kompleksi Kahramanmaraş’ın Kuzeyinden başlayıp Van’ın güneyine kadar devamlılığı takip edilebilen volkanosedimanter bir kayaç topluluğudur. Güneydoğu Anadolu orojenik kuşağının nap zonunda yeralan kompleks, çalışma alanı içerisinde Bitlis Metamorfikleri ve Kretase yaşlı ofiyolitik birimler tarafından tektonik olarak üzerlenmektedir. Birim genel olarak sığ denizel bir litoloji ile başlayıp derin denizel pelajik sedimanter kayaçlar ile devam eden ve bunlara eşlik eden Karadere formasyonu olarak tanımlanan volkanik/subvolkanik kayaç topluluğundan oluşmaktadır. Bu çalışma Çatak (Van)- Kozluk (Batman) arasında yüzeylenen Karadere formasyonuna ait ilksel jeolojik ve petrolojik bulguları içermektedir. Karadere formasyonu boyutları birkaç santimetreden on metreye kadar ulaşabilen yastık yapılı lavlardan oluşmaktadır. Birim çoğunlukla derin denizel pembe-kırmızı renkli mikritik kireçtaşları ile ardalanmalı olarak gözlenmektedir. Mikritik kireçtaşlarından elde edilen planktonik foraminifer topluluk yaşları Geç İpreziyen-Erken Lütesiyen olarak belirlenmiştir. Volkanik/subvolkanik kayaçlar başlıca plajiyoklaz + klinopiroksen ± olivin fenokristallerinden oluşmaktadır. Klinopiroksenler ojit ve diyopsit olup bileşimleri Wo44-51, En27-43, Fe10-21 arasında değişim göstermektedir. Plajiyoklasların anortit içerikleri altere olmamış tanelerde % 32-67 arasında değişmektedir. Olivinler ise genellikle altere fenokristaller şeklinde bulunmaktadır. Klinopiroksen kimyası kullanılarak elde edilen kristallenme sıcaklıkları ve basınçları sırasıyla 1126-1250 0 C ve 3-8 Kbar arasında değişmektedir. Volkanik/subvolkanik kayaçların büyük bir kısmı subalkali-toleyitik bazaltlardan oluşmaktadır ancak nadir de olsa andezitik ve riyolitik türevleri bulunmaktadır. Karadere Formasyonu içerisinde bulunan bazaltik kayaçların majör-iz ve nadir toprak element jeokimyası verileri volkaniklerin herhangi bir yitim bileşeninden etkilenmeyen E-MORB benzeri astenosferik mantodan itibaren türemiş olduklarına işaret etmektedir.
  • Thumbnail Image
    Conference Object
    Quaternary Basanitic Rocks within the Eastern Anatolian Volcanism (Turkey): Petrological and Geochemical Constrains
    (19th EGU General Assembly, EGU2017, 2017) Özdemir, Yavuz; Mercan, Çağrı; Oyan, Vural; Atakul Özdemir, Ayşe
    The Eastern Anatolian Cenozoic continental intraplate volcanism was initiated in Middle Miocene as a result of the convergence between the Arabian and Anatolian plates. The origin of Eastern Anatolian volcanism has been the focus of many petrological studies that have aimed to resolve the relative contributions of asthenospheric mantle and/or lithospheric mantle with/without subduction component in the genesis of magmas that compositionally have many affinities to ocean island basalts (OIB) and volcanic arcs. Volcanism in the region characterized by mainly stratovolcanoes, basaltic lava plateaus and are dominantly spread at the northern parts of Bitlis Pötürge Massif (BPM). Our study focuses on a small scale Quaternary basaltic system that firstly observed within the BPM. The volcanic rocks of our study located 50 km to the south of Lake Van and are basanitic in composition. They exposed along K–G striking tensional fissures and crosscut the Upper unit of the Bitlis Massif. Initial products of the volcanism are scoria fall deposits. Thick basanitic lava flows overly the pyroclastics and formed columnar structures. The basanites are generally fine-grained with phenocrysts of olivine+clinopyroxene. The groundmass is typically of clinopyroxene, olivine and Ti magnetite and Cr spinel with interstitial nepheline. The olivine phenocrysts are typically euhedral to subhedral with Forsterite contents of Fo73-83. Clinopyroxenes are highly calcic and show modest variations in Wo47-52-En34-42-Fs10-15 and are weakly zoned with mg# 89-87 at cores to 86-84 at rims. Nephelines occur as minor minerals within the networks of other groundmass minerals. Ti rich and Fe-Cr spinels occur as inclusions in olivine and clinopyroxenes as well as within the groundmass. LILE and LREE enrichments over HFSE and HREE suggest similarities with magmas generated from enriched mantle sources. EC-AFC modeling of trace element and isotope compositions indicates that assimilation of crustal lithologies have minor effect on the evolutionary stages of basanitic rocks. Based on LREE/HREE, MREE/HREE ratios and partial melting models, we suggest that basanitic rocks of Çatak are produced from a lower degree melting of a garnet bearing mantle source.