Türkiye Jeoloji Bülteni

Abstract: With the aim of exploring tectono-stratigraphy between Aydıncık-Bozyazı within the CentralTaurides of the Tauride belt by having some valuable field data; here, two tectonic units, which have tectoniccontact relations each other and representing that were formed in different basinal settings regarding to theirstratigraphy, rock type and structural properties, and unconformably overlying Mesozoic corbonatesequences were defined in this study. These tectonic units are called the Geyikdağ tectonic unit in the southand the Aladağ tectonic unit in the north. The carbonate sequences overlying these tectonic units have beenexamined as Mesozoic sediments in this study. These are unconformably overlain by Tertiary sediments.11 formations, which were deposited within the time period of Precambrian-late Permian, weredistinguished in the Geyikdağı tectonic units. These are called Sipahili (Precambrian), Hüdai (LowerCambrian), Çaltepe (Lower-Middle Cambrian), Eğripınar (Lower Silurian), Hırmanlı (Lower Silurian),Karayar (Upper Silurian-Lower Devonian), Sığırcık (Lower Devonian), Büyükeceli (Middle Devonian),Akdere (Upper Devonian), Korucuk (Lower Carboniferous) and Kırtıldağı (Upper Permian) formations frombottom to the top. 4 formations, which were deposited within the time period of middle Devonian-earlyTriassic, were distinguished in the Aladağ tectonic unit. These units from bottom to the top are called asGölboğazı (Middle-Upper Devonian), Dikenlidere (Carboniferous), Dumlugöze (Permian) and Mediova(Lower Triassic) formations. These two tectonic units are overlain by Mesozoic carbonates with angularunconformity. Mesozoic sediments are mainly represented by Murtçukuru (Upper Triassic) Cehennemdere(Liassic-Lower Senonian), Yavca (Upper Campanian Maastrichtian)formations and Hasancık (Campanian)limestone. Hasancık limestone, which is mainly made up of beige-cream, mid to thick bedded limestone,partly including brecciated carbonate, is firstly described and named in this study. All these units are coveredby late Oligocene-? early Miocene Derinçay and early-middle Miocene age Mut formations with angularunconformity. 

Öz: Çalışma alanı, Türkiye`nin güneybatısında Acıgöl - Isparta arasında yer almaktadır. İnceleme alanınıntemel kayaçlarını Triyas-Jura yaşlı beyaz renkli kristalize kireçtaşları ve Kretase yaşlı tabakalı kireçtaşlarıoluştururken, temelin üzerine Alt Tersiyer yaşlı türbiditik kumtaşları marn ve kiltaşı yer almıştır. Bu Tersiyerserilerinin üzerinde Miyosen yaşlı konglomera, kumlu marn ve kiltaşı ile Pliyosen yaşlı marn, konglomera vetürlerden oluşan göl çökelleri yer almaktadır. En üstde ise Geç Pliyosen-Kuvaterner yaşlı karasal kırmızı serilerbulunur.Üst Kretase-Tersiyer yaşlı kayaçlardan ölçülü stratigrafık kesitler boyunca örneklemeler yapılmıştır.Derlenen numunelerin tüm kayaç ve kil fraksiyonunun mineralojisinin belirlenmesi yanında kimyasal analizler deyapılarak bölgedeki kil minerallerinin kökenini tespit etmek ve kaynak bölgeyi saptamak bu çalışmanın amacıdır.Tüm kayaç analizlerinde kalsit, kil, kuvars, feldispat ve dolomit mineralleri belirlenirken kil fraksiyonundasımektit ana kil minerali, illit minerali ise ikinci derecede önemli mineraldir. Gölün doğu kısmında Paleosen-ErkenEosen yaşlı birimler ile, Orta, ve Geç Eosen yaşlı birimlerde simektit hakim mineral olarak saptanırken, illit veklorit ikinci derecede önemli minerallerdir. Az miktarda kaolinit ve talk da bulunan diğer minerallerdendir. Gölünbatı kısmında ise, Paleosen-Eosen-Miyosen serilerde illit hakim mineral olarak görülmektedir. Pliyosen birimlerdesımektit minerali hakimdir. Kil fraksiyonun kimyasal analiz sonuçlarına göre, kırıntılı birimlere bağlı örneklere aitkil fraksiyonu A₂0₃ bakımından, kimyasal çökelim birimlerindeki kil fraksiyonları ise MgO bakımındanzengindir. Ayrıca bazı örneklerde serpantin mineralinin de bulunması depolanma havzasının iki farklı kaynakdanbeslendiğini göstermektedir. Çalışma alanı içinde illit ve kloritler çevredeki metamorfik kayaçlardan taşınandetritik minerallerdir, serpantin minerallerinin, ultrabazik kayaçlardan kaynaklandığı, kil fraksiyonunda kırıntılıbirimlere bağlı simektitlerin ise farklı kaynaklardan türeyen detritik malzemenin transformasyonu ile oluştuğudüşünülmektedir.

Abstract: Considering the former and the recentprints of the 1/500.000 Scale Geological Maps of Turkey, anapproximately 40 km2 area between Seydiler, Ağlı town and İmranlar village located at the north ofKastamonu city in westhern Blacksea Region ispresented as orange colored Eoceneflysch in the former onewhile in the recent as unidentifıed Çuaternary. The same area is presented as Quaternary and Neogene inTunoğlu 1991a and 1991b. The unit spread out widely in this region is namedfor the first time as "Seydilerformation". The formation in question shows a paraconformable relation with Lutetian Gürleyikdereformation at the basement but an obvious hardground surface can be observed between them. At the top, it isoverlaid by recent alluviual deposits and observed as errosional surfaces. Litostratigraphical andpaleontological investigations were carried but on 184 samples collected from 7 measured stratigraphicsections that completes each other, whole rock analysis and related clay mineralogy and sandstonepetrography examinations were realisedon labratory research levelfor litostratigraphy and paleontologicalobservations were carried out particularly on planktic and benthic foraminifera, ostracoda, nannoplanktonand dinoflagellate assemblages. Considering all together the present microfauna, the age of Seydilerformation is assigned as Late Lutetian-Bartonian. In addition to environment determinating characteristicof the ostacod fauna, taking in consideration the other microfauna and flora present, besides lithologicalaspects and theirfacies characteristics, the deposition of Seydiler Formation is thought to be occured in amarine environment and at depths changing from neritic to bathial under transgressive conditions.

Abstract: The Lahanos volcanogenic massive sulfide (VMS) deposit is situated in the westernpart of the easternPontide tectonic belt. The deposit is hosted predominantly by a late Cretaceous felsic volcanic complex and ismined mainly for copper and zinc. The deposit is essentially stratabound, with characteristics of both Cu-Znand Cu-Zn-Pb-type stratiform VMS deposits. The deposit consists mainly of yellov ore (oko) and a zone thatcan be considered as semi-blackore.Ore mineralization occurs mainly as massive ore, and to lesser extent as disseminated andstochvorkore. Major ore minerals include pyrite, chalcopyrite, sphalerite, galena, tetrahedrite/tennantite, bornite, andminor to trace covellite, marcasite, chalcocite, and digenite. Gangue minerals are chiefly auartz and baritewith minor calcite and dolomite. The deposit has aparagenetic seguence of pyrite (I, II) - chalcopyrite (I)sphalerite - galena tetrahedrite/tennantite digenite chalcosite pyrite (III) - chalcopyrite (II) bornite -covellite. A great variety of intimate intergrowth ore textures including replacement, colloform, disseminated,and fragmental textures prevail throughout the deposit.The fıne-grained nature of the Lahanos ore presents diffıculties in benefıciation. Sphalerite, as inother VMS deposits of the region, is notably Fe-poor (< 0.7 wt. %).