Türkiye Jeoloji Bülteni

Abstract: Microfaunal properties of the Lower Member of the Sinan Formation and limestone lenses of the AntakFormation which are seen in Districts V and VI of Southeastern Turkey are not similar with the Besni Formationseen in District VI, as has sofar been accepted. The Lower Member of the Sinan Formation and the limestone lensesof the Antak Formation (both Lower Late Maastriehtian in age) are older than Besni Formation (Upper LateMaastriehtian). 

Abstract: Tertiary and Quaternary continental sediments and volcanic products cover large areas in Uşak region.The purpose of this project is to construct the Neogene stratigraphy in detail and to evaluate the facies and paleoge
ography of the continental basins. The Menderes Massif metamorphics constitute the basement rocks in this region.Three main formations are observed. The granitic gneisses of the Güney köyü formation and the augen gneisses andvarious schists of the Eşme formation show lateral gradation. These units are overlain by the Musadağı marbles. Meso- zoic is represented by the dolomitic limestones (Jurassic) of the Kızılcasöğüt formation and the Vezirler melange, emplaced in Upper Cretaceous. Neogene starts with alluvial fan deposits (Kürtköyü formation), Lower Miocene in age.This unit is overlain by 800 m thick, fluvial deposits of the Yeniköy formation (Upper-Middle Miocene). Dikenderevolcanics are Middle Miocene in age. The lacustrine deposits of the Küçükderbent formation (Upper Miocene), whichis about 50-60 m thick, conformably overlies the Yeniköy formation. Miocene ends with the Karaboldere volcanicswhich is composed of various lavas. Ahmetler formation (Lower Pliocene) has three members: a) The Merdivenli kuyu member is a scree deposit, b) The Balçıklıdere member is a fluvial unit, about 200 m thick, c) The Gediklermember indicates that the fluvial features has come to end and the lacustrine deposition has started. Ahmetler for mation contains materials derived from the Beydağı volcanics, Lower-Middle Pliocene in age. The fossiliferous, about250 m thick, Lacustrine Limestones o the Ulubey formation overlies the Ahmetler formation. Above these limestones there are the Payamtepe volcanics, Upper Pliocene in age. Asartepe formation represents the fluvial environmentof the Lower Quaternary deposits. Kula volcanics are Upper Quaternary in age.

Abstract: At about 4 km. east of Çelikhan (Adıyaman) intrusive rocks crop out in a tectonic zone. These intrusive, leucocratic quartz monzonites form a circumbscribed, post-tectonic stock which is fairly heterogeneous by itslocal compositional variations and by the presence of numerous xenoliths of various origins. A straight zone ofthermal metamorphism, rich in biotite, has developed in the former crystallophyllien rocks at the contact of theintrusion, the fragments of which are found in the lutetian sediments. These observations have been confirmed byK/Ar measurements, made on the biotites (62 m.y.) which show the age of the intrusion.

Abstract: Hydrochemical investigations during a period, longer than one year, has shown the seasonal changes onthe brine of the Salt Lake (Central Anatolia-Turkey). Two water bodies, separated by a sill, have different chemicalcompositions. The shallow main lake has the concentration around 300-350 g/1 of dissolved material, while the deeperregion has only 80 g/1. At the end of summer, brine concentration reaches to 9,4 g/1 K + ,25,3- g/1 Mg++,640 mg/1Br-,340 mg/1 B and 305 mg/1 Li+. The seasonal concentration values of the several cations and anions and theireffects on the mineralization are discussed.

Abstract: Two species of micro mammals which belong to the Anchitherium fauna from Sarıçay are described. Thefirst is a new species of Pliospalax known from Turolian (Upper level of Upper Miocene) to Early Villanyian (LatestPliocene - Earliest Pleistocene) levels. It is described in Middle Astaracian (Upper level of Upper Miocene of Turkey and compared with other known species from Greece, Ukraine and Turkey. The second one is Anomalomys gaudryiknown Middle Miocene levels of European localities.

Abstract: Autochthonous shelf and allochthonous/o genie sediments and magmatic rocks constitute the stratigraphy of the Ergani-Maden region. Mardin and Saymdere carbonates, and Şimşim melange of Cretaceous age, Antakred beds,, Fırat reef al limestone, and Lice sandstones of Tertiary age constitute the stratigraphy of the shelf area.Hazar flysch, Gehroz limestone, Maden olistostrome, Davudan volcanic rocks and Engene sandstones constitute theallochthonous block. These are d`splaced southward for about 30 km on  the shelf sediments. Although Maden formation has a chaotic olistostrome appearance, the stratigraphic sequence within this formation has been roughly determined. Slide blocks of limestone, volcanism and thrust faulting at the end of Miocene imparted a chaotic appearanceto this formation. Bahro ultramafic rocks form the base of the allochthonous plate. Ultramafic rocks slid southward aslenses and intruded as cold plastic masses in sediments during Upper Miocene thrust faulting. Part of the ultramafic rocks that occur within Maden formation as large masses may be of younger than Cretaceous.

Abstract: The Çanakkale-Bayraktepe fosiliferous bed is important in that it contains specimens of both continentaland oceanic vertebrate fossil fauna. Although, fish jaws and teeth show a littoral property, fossils of mammalianvertebrate indicate continental conditions. Littoral and continental fauna which are contemporaneous increases theimportance of this fossil bed. The explainin the fish teeth belong to Sparus aff. auratus LÎNNE, Sparus cinctusAGASSIZ, Diplodus sp. specieses which is included by the Sparidae family.

Abstract: Stratigraphical positions of Craniotreta n.gen., Schizotretoides n. gen., Conotreta sp., Schizotreta sp. fromLower Ordovician and Middle Cambrian Strate of Western Taurus are discussed and their paleontological descriptionsare presented.

Abstract: The ophiolites having melange characteristic cropping out the southeast of Şarkışla (Sivas) town have emplaced as olisthostrome during the flysch sedimentation of Lower Tertiary. Olisthostrome which has the 300 mof thickness can be followed 8.5 km laterally. The olisthostrome lies near the top of the Lower Tertiary flysch whichis interbedded volcanic materials. Deformations which is interested with slumping has been observed in the flyschbeds at the lower contact between the olisthostrome and flysch. In addition, the slumping folds have been presentedin the flyseh beds near the lower contact of the olistbostrome. Serpantinites dominates in the ophiolitic melange,which constitutes theolisthostrome. It also consist of peridotit, diabase, tuff, radiolarite and limestone olistholistes,which range size from a few dm to 0.25 km. The fossils in this limestone olistholites are of Upper Cretaceous age.The emplacement age of olisthostrome is of Middle-Upper Paleocene.

Abstract: In this investigation, the description of Polydiexiodina erki n. sp. is given which is found abundantly inUpper Permian limestones, and calcareous arenites cropping out at Gensirt hill which is located in NE Elmadağ:. Thesamples were taken from Late Palaezoic sequence determined in thin sections, and the new species compared with theother well known Polydiexodina species.

Abstract: In the Haymana-Polatlı area, situated to the southwest of Ankara, occurs a Northwest to Southeast aligned basin containing some 5800 metres of Maestrichtian and Lower Tertiary sediments. On both flanks of the basin canbe observed down-to-the-basin step faulting. Examination of seismic reflection profiles transverse to the principal axisof the basin, reveals that while certain reflecting horizons of Maestrichtian and Lower Tertiary age are cut by thesefaults, others appear to continue uninterruptedly across the faults. A Paleocene andesitic volcanic phase occurred,seen as Northwest to Southeast aligned outcrops. The Maestrichtian and Lower Tertiary facies boundaries trend parallelthe basin margins. Similarly the sediments occurr;ng towards the marginal parts of the basin are marked by their coarsely granular aspect and the semicontinental character of their detritus in contrast to the finer grained and completelymarine nature of basinwa^d occurring formations. Measurements indicate a prevailing current direction from Northwestto Southeast.The preceding evidence together with other supporting data indicate that we are dealing with an ancient grabenfeature.