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Öğe Facies characteristics of Jurassic-Lower Cretaceous successions at Kosrelik-KosrelikA +/- zA +/- gA +/- (North of Ankara, Turkey)(SPRINGER, 2018) Delikan, Arif; Atasagun, NesrinJurassic-Lower Cretaceous rocks in the Kosrelik and KosrelikA +/- zA +/- k areas (North of Ankara, Central Turkey) which were deposited in a tectonically controlled basin have outcrops in a very restricted area but they carry very important evidences for elucidating the Late Jurassic paleogeography of the Ankara region subjected to heavy tectonic activities during Hettangian-Oxfordian, especially during Sinemurian. Detailed facies analysis of sequences in the study area indicates that the deposition took place in two different tectonically controlled depositional settings, 3 km apart from each other. At the east of the study area, the succession is represented by Hettangian-Sinemurian aged basin sediments lying on the basement rocks with angular unconformity, but succession at the west comprises sediments of Oxfordian pelagic carbonate platform (PCP) overlying the basement rocks with angular unconformity. The PCP sediments were overlapped by radiolaria bearing pelagic limestone, Oxfordian-early Cretaceous in age, under relatively calm environmental conditions. Anomalies in C and O isotopes, trace elements and rare earth element values coincide with the periods of fast changes in the environmental conditions. The sedimentological and geochemical data indicated that the area was deepened and shallowed several times until early Cretaceous.Öğe PRELIMINARY MINERALOGICAL AND CHEMICAL PROPERTIES OF HALITE IN THE SOUTH OF TUZGOLU BASIN (TURKEY)(GEOBALCANICA SOC, 2017) Ercan, Hatice; Karakaya, Muazzez Celik; Karakaya, Necati; Bozdag, Ayla; Delikan, ArifThe study area is located in the southern parts of Tuzgolu basin namely closed Konya basin, which is one of the largest inner/closed basin of Neogene age in the Central Anatolia (Turkey). The basin was mostly filled with the Late Cretaceous-Quaternary aged different types of minerals. The basin, in deep, starts red colored clastic sediments which are formed from thick red clastic unit was deposited in shallow-deep-shallow marine environments. This study was primarily focused on the textural properties of halite mineral in the Miocene units. The textural properties of the halite mineral have been investigated mainly for detection of environmental conditions and origin of halites as primary and secondary halites. Remnant of chevrons structures are most common primary texture preserved in ancient halite deposits. Upward-growing chevrons determined in the halite minerals show that these textures contain rich fluid inclusions and have cloudy or milky appearance. Halite minerals are interlayered with carbonate, sulfate and clay minerals in the studied core samples. The halite layers are generally observed in thick of mm-dm, salt deposits in the dm-m in size precipitated when condition are suitable that huge thickness of shoal water evaporite can accumulate in very short time frames. The thin laminates of halite indicate the fluid chemistry causing the precipitation and changed in a short time interval of the environment condition. The presence of hoper-textures in halite minerals indicated that the first precipitated on the shallow hyper saline brine pools and when they were undisturbed by wind and waves. The secondary marks were commonly observed in the drillings as the nodular structure anhydrite and mosaic texture of halite. The ratios of Cl/Br and Na/Br in the studied halite samples have very high values that are in relation to dissolution and mixing.Öğe Stratigraphic and Sedimentological Characteristics of Jurassic-Lower Cretaceous Sediments at Kosrelik-Kosrelikizigi (North of Ankara, Turkey)(SPRINGER INT PUBLISHING AG, 2014) Delikan, Arif; Atasagun, NesrinJurassic-Lower Cretaceous rocks to the northeast of Ankara (central Turkey) were deposited in a tectonically controlled basin that was aligned SW-NE. Vertical and lateral lithological variations in the sequence resulted from synsedimentary tectonism. The Jurassic-Lower Cretaceous sequence in the study area overlies the weakly metamorphosed Late Triassic rocks (the Karakaya Complex) with an angular unconformity. The sequence begins with interbedded deltaic conglomerate and sandstone (the Corakliktepe Member). The Sinemurian-lower Pliensbachian sandy limestone overlies the coarse sandstone with both a lateral and vertical transition. The sandy limestone is red in colour and highly fossiliferous. Crinoidal limestone and ammonite-bearing marl rest on the sandy limestone, signifying a rapidly deepening depositional environment. It is overlain by red marl containing brachiopods and bivalve coquina interbeds. The intermediately bedded pseudonodular limestone with abundant ammonites, crinoids, brachiopods, and bivalves is found above the red marl. Following synsedimentary tectonism, thick nonfossiliferous mudstone was deposited over the ammonitebearing rocks (the Uzundere Member), indicating that the area shallowed during the early Pliensbachian. During the late Pliensbachian-early Toarcian, detritic rocks were deposited followed by a progressive change to deposition of variegated red limestone. This typical ammonitico-rosso facies wedges laterally into green mudstone (the Beytepe Member). After the Bajocian, the area rapidly shallowed and thick interbedded sandstone and mudstone (the Turnacesme Member) were deposited over the entire basin. Due to post-Callovian block faulting in the area, the base topography of the basin was changed. For that reason, in the northern part of the study area, the pelagic carbonate platform sediments (the Cakirlardere Formation) containing abundant ammonite and pelagic oolite were deposited directly onto the basement rocks. This points to the development of shallow areas offshore as a result of synsedimentary faulting. The pelagic ooid-bearing limestone grades laterally and vertically into cherty limestone. During the Oxfordian-Early Cretaceous, the area deepened and limestone with Radiolaria (the Sogukcam Formation) was deposited.Öğe STRUCTURAL PROPERTIES OF THE NEOGENE EVAPORITE DEPOSITS IN THE SOUTH OF TUZGOLU BASIN, TURKEY(GEOBALCANICA SOC, 2017) Delikan, Arif; Bozdag, Ayla; Karakaya, Necati; Ercan, Hatice; Karakaya, Muazzez CelikTuzgolu Basin located at the Central Anatolia is an inner enclosed basin and is bounded by Ankara uplift in the north, the Kirsehir massif from in the east and the Sivrihisar-Bozdag massif from the west. The Salt Lake is bordered by Tuzgolu, Aksehir and Nigde fault zones in NE-GW direction. Typical mechanical and sedimentary structures in the evaporitic sediments are observed in especially gypsum and anhydrite, partially glauberite and halite deposits. The most prominent structures observed in the investigated cores are usually sequential sedimentation or stratification, other primary structures are slump structures, sub-strata traces, mud cracks and flat conglomeratic gravel sediments. Stratification in the evaporites showed changes in the mineralogical and textural properties from the bed to the bed. There are also settlement/load structures, ripple cross lamination and cross stratification were determined. As a result of sedimentation, sedimentation-grade bedding and intercalation of clay or carbonate mud and salted mineral mud have been observed. The lacustrine sediments in the inner zones of the basin consist of Ca-Na-sulphate, Mg-sulphate sediments, claystone, carbonate alternation and partly laminated. Repeating the evaporitic sediments in mm and cm thickness provides a seasonal sedimentation view.Öğe Ürünlü (Çumra-Konya) Çevresinde Yeraltısuyu Seviye Değişimleri ve Obruk Oluşumları(Selçuk Üniversitesi, 2022) Göçmez, Güler; Dülger, Alper; Arık, Fetullah; Delikan, Arif; Çoşkuner, Berkant; Kansun, Gürsel; Döyen, Adnan; Arslan, ŞükrüKonya Kapalı Havzası içerisinde yer alan Ürünlü (Çumra-Konya) Mahallesi ve çevresi tarımsal üretim bakımından havzanın en önemli bölgelerinden biridir. Çumra İlçesinin yaklaşık 9 km doğusunda bulunan Ürünlü mahallesi ve çevresinde Geç Miyosen-Pliyosen yaşlı İnsuyu formasyonu temeli oluşturmaktadır. Çumra bölgesinde 43 adet sondaj kuyusundan seviye ölçümü yapılmıştır. Kuyuların derinlikleri 20-200 m, debileri 5-40 l/s, beslenim dönemindeki statik seviyesi 13.9-110.26 m, boşalım dönemindeki statik seviyesi 22 m-101.2 m’dir. Bu dönemler arasında kuyularda 0.1 m ile 29 m arasında düşüm olmuştur. İnceleme alanında Konya Fay Zonu’na paralel fayların yanı sıra yaklaşık D-B doğrultulu faylar da yer almaktadır. Obrukların Konya Fay Zonu doğrultusuna paralel oldukları tespit edilmiş olup bölgedeki obruk oluşumlarının faylarla ilişkili olduklarını göstermektedir. İnceleme alanındaki obruklar İnsuyu formasyonu ve üzerine çökelmiş genç birimler içerisinde oluşmaktadır. Obrukların tamamı 1000-1010 m kotları arasındadır. Obrukların bir kısmının çevresinde konsantrik yarık ve çatlaklar bulunmakta ve obruklar derine doğru daralan bir yapı sunmakta ve obrukların gelişimi devam etmektedir. Ürünlü Mahallesinin kuzey kesiminde yaklaşık 1.4 x 1.0 km boyutlu alan içinde 23 adedinin derinliği 1-3 m arasında, 342 adedinin derinliği 1 m’den daha sığ olmak üzere toplam 365 adet obruk tespit edilmiştir. Obrukların uzun eksenleri 0.7 m ile 88.5 m, kısa eksenleri ise 0.7-44.0 m arasında değişmektedir. Yerleşim bölgelerine ve bazı tarımsal sanayi üretim tesislerine oldukça yakın olan bu bölgede obruk alanları 0.38 m2 ile 2674.69 m2 arasındadır. Bölgede çok su isteyen mısır, ayçiçeği vb. bitkilerin ekilmesi, kuyulardan yapılan aşırı su çekimi yeraltısuyu seviyesinin düşmesine neden olmakta ve obruk oluşumunu hızlandırmaktadır. Akiferlerden olan çekim beslenimden oldukça fazladır. Her geçen gün artan kaçak kuyular, uygun olmayan bitki deseni, aşırı çekim yeraltı su seviyesinin düşmesine neden olmakta ve obruk, yarık ve çatlakların oluşumunu hızlandırmaktadır. Bölgedeki obruklar yerleşim yerleri ve tarımsal sanayi üretim tesisleri için tehlike arz etmektedir.
