Türkiye Jeoloji Bülteni

Abstract: The Kemalpaşa Plio-Quaternary basin was constructed during the period of N-S extension which has beenreactivated nearly 5 Ma BP causing the opening of E-W trending grabens following a short-time compressionphase in Western Anatolia. The Kemalpaşa basin, southwestern one of the westerly furcated branches ofGediz Graben, has a Neogene basement composed of Lower-Middle Miocene and Upper Miocene-lowermostPliocene continental sedimentary sequences seperated by a regional unconformity. The Lower-MiddleMiocene Kemalpaşa group is represented by the Dereköy, Örnekköy and Topçutepe formations depositedin fandelta, lacustrine and fluvial environments respectively and the calcalkaline andesitic Yukarıkızılcavolcanics. The Çiçekliköy group, which is deposited during the Late Miocene to early Early Pliocene, consists of alluvial Ulucak formation in its lower part and overlying lacustrine Yaka limestone.The deposition in the Kemalpaşa basin, which is formed in two successive phases during the late EarlyPliocene and Holocene respectively, is represented by the Gediz group. The first phase depositsof lateEarly Pliocene-Plesitocene on the hanging wall of Gediz Graben detachment fault arethe lacustrineÇiniliköy formation and lateral alluvial Kızılca and Armutlu formations. Alluvial fan and fluvial depositsof the second phase have been deposited in the Holosen basin opening on the first phase deposits by theKemalpaşa high-angled oblique-slip normal fault.

Abstract: The study area is located in the eastern part of Pontides metallogenic belt. The metallogenic belt of the easternPontides has a significant potential in terms of ore formations such as volcanic massive sulphide (VMS),porphyry Cu-Mo, epithermal, skarn, chromite. In this study, hydrothermal alteration features associated with VMS-type ore formations have investigated by using Landsat 7 ETM+, ASTER images and ASD Fieldspec Prospektrometer. To determine the hydrothermal alteration minerals, band ratio method have been applied to bothimages. Also, Landsat 7 ETM + and ASTER satellite images have been analyzed by using respectively CrostaTechnique and matched filtered (MF) methods, and the hydrothermal alteration zones associated with the oreformations such as argillic alteration, silicification, ironoxide in region have been mapped. The results obtainedthrough image analysis have been evaluated by using especially Geographic Information Systems (GIS)environment and at last, the potential target areas of hydrothermal alterations to be important in term of VMStype ore deposits have been determined. In particular, an extensive areas of argillic alteration have beendistinguished on Upper Cretaceous aged dacitic volcanic units. Also, the anomalies areas of alunite/kaoliniteand silicification have appeared as spatially associated with argillic alteration in some region. The direction ofapproximately NE-SW of determined hydrothermal alterations have been seen as a characteristic feature.

Abstract: Chlorite minerals are commonly found in the units of Karakaya Complex that reflect different tectonicsettings and evolution. In this study, the availability of chlorites has been investigated as a parameteron the interpretation of the diagenetic-metamorphic evolution and revealing the geological history fromthe different units of the complex. Primary and secondary chlorite minerals in the low-very low-grademetamorphic rocks have interference colors of blue and brown and an optical isotropic appearance withvery low birefringence. Chlorites are seen in the matrix, pores and/or pods of rocks as platy/flaky andpartly radial forms. According to X-ray diffraction (XRD) data; Mg-Fe chlorites with entirely IIb polytype(trioctahedral) exhibit various compositions such as brunsvigite-diabantite-chamosite. Furthermore,chlorite minerals correspond to felsic and metabasic origins in terms of the rocks from which they derived.Similarly, geochemical data such as the major element contents and structural formulas of chlorites alsosuggest a different composition and origin. Trace and especially rare earth element (REE) concentrationsof chlorite minerals increase from schist towards slate depending on their degree of metamorphism andnature of the host rocks. This relationship can be significantly noticed in the chondrite-normalized REEand trace element patterns. These changes show that are they are related to the structures, formationmechanisms and tectonic environments of the chlorite minerals. In other words, they suggest that chloritesmay play a key role in distinguishing of units with different geological history.

Abstract: The Konyaaltı and Lara beaches are located in the center of Antalya, to the northeast and northwestparts of Gulf of Antalya, respectively. In this study, the grain size features of two beaches which controlunder the same hydrodynamic conditions were compared within detail. While the mean grain size in theKonyaaltı beach vary from -3,50 ϕ to 0,82 ϕ, in the Lara beach it ranges between -0,43 ϕ and 1,81 ϕ. Thereis increasing in the grain size depend on eastward transportation in the Konyaaltı beach, however similar changes cannot observe in the Lara beach. Sorting parameter that determined in the Konyaaltı and Larabeach represent well sorted and mostly poorly sorted, respectively. According to the results obtained fromthese two beaches, they were defined within coastal classification, and relationship between grain sizeparameters, longshore current and catchment area was discussed.