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Articles 1 - 30 of 44
Full-Text Articles in Physical Sciences and Mathematics
Early Pleistocene Freshwater Communities And Rodents From The Pasinler Basin (Erzurum Province, North-Eastern Turkey), Davit Vasilyan, Simon Schneider, Memet Sali̇h Bayraktutan, Şevket Şen
Early Pleistocene Freshwater Communities And Rodents From The Pasinler Basin (Erzurum Province, North-Eastern Turkey), Davit Vasilyan, Simon Schneider, Memet Sali̇h Bayraktutan, Şevket Şen
Turkish Journal of Earth Sciences
An Early Pleistocene lacustrine faunal assemblage from Pasinler (Erzurum Province, north-eastern Turkey) is described, which encompasses 13 mollusc, 5 fish, 2 amphibian, 1 reptile, and 1 mammal species. The autochthonous freshwater mollusc fauna indicates shallow stagnant waters and a fine-sandy to muddy lake bottom, grown with submersed plants. The fish community (Leuciscus sp., Rutilus sp., Chondrostoma sp., Leuciscinae sp. 1 and 2, and Capoeta sp.) and autochthonous herpetofauna (Latonia sp. and Natrix sp.) provide evidence of a well-oxygenised palaeolake with rich periphyton and partially rocky to gravelly bottom. Moreover, the presence of the terrestrial snail Caspicyclotus cf. akramowsii, the peri- …
On The Reconstruction Of Plant Photosynthetic And Stress Physiology Across The Triassic-Jurassic Boundary, Matthew Haworth, Angela Gallagher, Elysia Sum, Marlene Hill-Donnelly, Margret Steinthorsdottir, Jennifer Mcelwain
On The Reconstruction Of Plant Photosynthetic And Stress Physiology Across The Triassic-Jurassic Boundary, Matthew Haworth, Angela Gallagher, Elysia Sum, Marlene Hill-Donnelly, Margret Steinthorsdottir, Jennifer Mcelwain
Turkish Journal of Earth Sciences
The Triassic-Jurassic boundary (TJB) coincides with major disruption to the carbon cycle and global warming as the Central Atlantic Magmatic Province developed. This resulted in both marine and terrestrial extinctions, with terrestrial plants thought to experience thermal stress as global temperatures and atmospheric CO_2 levels rose. As plant compression fossils typically only preserve external morphological features, it has not been possible to reconstruct plant paleophysiology in order to elucidate the mechanisms underlying plant stress and extinction. Here we present a new approach allowing us to infer the photosynthetic performance and stress physiology of fossil plants, applied to fossil Ginkgoales across …
Ree Geochemical Characteristics Of Titanium-Rich Bauxites: The Permian Kanigorgeh Horizon, Nw Iran, Ali Abedini, Ali Asghar Calagari
Ree Geochemical Characteristics Of Titanium-Rich Bauxites: The Permian Kanigorgeh Horizon, Nw Iran, Ali Abedini, Ali Asghar Calagari
Turkish Journal of Earth Sciences
The Permian Kanigorgeh bauxite horizon is one of the typical titanium-rich bauxite deposits in the northeast of Bukan, West Azerbaijan Province, NW Iran. It is a part of the Irano-Himalayan karst bauxite belt and was developed as discontinuous stratified layers and lenses in Upper Permian carbonates. Mineralogically, diaspore and kaolinite are 2 major mineral phases accompanied by boehmite, smectite, illite, rutile, anatase, hematite, goethite, chlorite, quartz, and plagioclase as minor phases. Geochemical considerations for a selected profile indicate that the concentration values of rare earth elements (REEs) in the bauxite ores range from 8.9 to 200.4 ppm. Eu and Ce …
Geochemistry Of Sands Along The San Nicolás And San Carlos Beaches, Gulf Of California, Mexico: Implications For Provenance And Tectonic Setting, John Selvamony Armstrong Altrin, Ramasamy Nagarajan, Yong Il Lee, Juan José Kasper Zubillaga, Leslie Patricia Córdoba Saldaña
Geochemistry Of Sands Along The San Nicolás And San Carlos Beaches, Gulf Of California, Mexico: Implications For Provenance And Tectonic Setting, John Selvamony Armstrong Altrin, Ramasamy Nagarajan, Yong Il Lee, Juan José Kasper Zubillaga, Leslie Patricia Córdoba Saldaña
Turkish Journal of Earth Sciences
The weathering conditions, provenance, and tectonic setting of sands from the San Nicolás (SN) and San Carlos (SC) beaches along the Gulf of California, Mexico, have been studied using mineralogy, major element, and trace element data. The compositional similarity among 4 independent groups (each beach area consists of 2 grain-size groups, i.e. medium- and fine-grained sands) was tested statistically by the application of analysis of variance at the 99% confidence level to avoid misinterpretation. The X-ray diffraction and SEM-EDS data revealed that the fine-grained SN sands were abundant in rutile and zircon minerals. The higher SiO_2/Al_2O_3 ratio of the SN …
Structural Analyses Of Şaphane Relay Ramps And Fault Linkage Evolution In Active Extensional Regime, Western Turkey, Şule Gürboğa
Structural Analyses Of Şaphane Relay Ramps And Fault Linkage Evolution In Active Extensional Regime, Western Turkey, Şule Gürboğa
Turkish Journal of Earth Sciences
The Şaphane relay ramps (SAR-I and SAR-II) are well-developed structures formed by extensional tectonic settings in western Turkey. Their formation is controlled by the configuration of 2 different breaching faults located in between and the overlapping area of 3 normal faults, which are the Şaphane, Gürlek, and Yumrutaş faults. The relay ramps form within a ~3 km-wide and ~12 km-long interaction zone between 045° and 060° trending faults on the northern boundary of the Erdoğmuş-Yenigediz graben. Some variations in structural styles and its products (for example, overlapping slip-lines (slickenlines), fractures, and antithetic-synthetic faults) are observed along the breaching faults in …
Toxic Element Contamination In Waters From The Massive Sulfide Deposits And Wastes Around Giresun, Turkey, Necati̇ Karakaya, Muazzez Çeli̇k Karakaya
Toxic Element Contamination In Waters From The Massive Sulfide Deposits And Wastes Around Giresun, Turkey, Necati̇ Karakaya, Muazzez Çeli̇k Karakaya
Turkish Journal of Earth Sciences
This study assessed the quality of water polluted with mine drainage waters, some of which is used for drinking and agriculture, in the urban areas of the Giresun region, Turkey. A total of 40 water samples were collected from the main rivers and stream, spring, and drainage waters. All samples were analyzed for physical and chemical parameters. The tectonically controlled massive sulfide deposits hosted in the Maastrichtian-Eocene magmatic rocks are either active or have been abandoned. The main ore mineral assemblages are chalcopyrite, sphalerite, galena, and pyrite. The oxidation of the sulfide minerals in the deposits and wastes has caused …
The Utility Of Vulnerability Maps And Gis In Groundwater Management: A Case Study, Muhterem Demi̇roğlu, John Dowd
The Utility Of Vulnerability Maps And Gis In Groundwater Management: A Case Study, Muhterem Demi̇roğlu, John Dowd
Turkish Journal of Earth Sciences
Groundwater supplies are experiencing a critical shortage in arid and semiarid regions, as population growth, and hence demand, is not matched by the development of new water supplies. Groundwater is often the only water source in these areas, making the preservation of groundwater quality a critical issue. Powerful tools for groundwater protection are vulnerability maps, which can be used to identify protection zones. A number of factors influence aquifer vulnerability, including geology, geography, land use, and commercial and industrial development. These factors often display a complex spatial pattern easily addressed with GIS. Each factor is entered in the GIS as …
Sedimentary Record Of Mid-Miocene Seismotectonic Activity In The Sinop Peninsula, North-Central Turkey, Ayhan Ilgar
Sedimentary Record Of Mid-Miocene Seismotectonic Activity In The Sinop Peninsula, North-Central Turkey, Ayhan Ilgar
Turkish Journal of Earth Sciences
The middle Miocene shallow-marine siliciclastic succession in the Sinop Peninsula, north-central Turkey, bears a well-preserved sedimentary record of syndepositional deformation associated with the buried escarpment of an oblique-slip dextral reverse fault and attributed to seismotectonic activity. The deposition occurred in a marginal trough at the edge of a tectonically inverted retroarc foreland basin of the Central Pontides. The synsedimentary deformation involved contemporaneous shoreface deposits and their consolidated, weakly cemented littoral substrate. Deformation features include neptunian dykes, convolute stratification, plumose transposition structure, injection dykes, diapirs, and large sandstone blocks dislodged from the fault escarpment. The genetic sequence of deformation structures deciphered …
Source Of The Mineralizing Fluids In Ultramafic Related Magnesite In The Eskişehir Area, Northwest Turkey, Along The İzmir–Ankara Suture: A Stable Isotope Study, Asuman Kahya, Mustafa Kuşcu
Source Of The Mineralizing Fluids In Ultramafic Related Magnesite In The Eskişehir Area, Northwest Turkey, Along The İzmir–Ankara Suture: A Stable Isotope Study, Asuman Kahya, Mustafa Kuşcu
Turkish Journal of Earth Sciences
The Eskişehir magnesite deposits (Süleymaniye, Margı, and Tutluca) are located in the western part of the İzmir-Ankara Suture Zone, northwestern Turkey. These vein and stockwork type magnesite deposits, which occur along major and minor fault systems, are hosted by Alpine-type ultramafic rocks. The purpose of this study was to understand the origin of the hydrothermal waters responsible and the source of carbon dioxide, and to compare these deposits with similar magnesite occurrences in Turkey and elsewhere. Petrographic and XRD analyses indicate that magnesite was the major carbonate mineral formed. Deposits are predominantly micritic and locally microsparitic, but some also contain …
Eocene To Early Oligocene Turbidite Sedimentation In The Se Aegean (Karpathos Island, Se Greece): Stratigraphy, Facies Analysis, Nannofossil Study,And Possible Hydrocarbon Potential, George Pantopoulos, Avraam Zelilidis
Eocene To Early Oligocene Turbidite Sedimentation In The Se Aegean (Karpathos Island, Se Greece): Stratigraphy, Facies Analysis, Nannofossil Study,And Possible Hydrocarbon Potential, George Pantopoulos, Avraam Zelilidis
Turkish Journal of Earth Sciences
Paleogene turbidite deposits that outcrop at the SE Aegean (Karpathos Island, SE Greece) were investigated using sedimentological, biostratigraphical, and organic geochemical techniques. Results indicate that turbidite sedimentation in the area took place from the Early Eocene (NP12-14) to Late Eocene-Early Oligocene (NP20-21). Six different units were recognized in the turbidite succession based on sedimentological characteristics, outcropping in 2 major areas of the island (1 in the north and 1 in the south) and having a thickness of less than 1000 m. Deposition and spatial arrangement of sedimentary facies was affected by the already deformed carbonate substratum and changes in the …
Temporal Evolution Of The Water Characteristics In The Bays Along The Eastern Coast Of The Aegean Sea: Saros, İzmir, And Gökova Bays, Canan Eronat, Erdem Sayin
Temporal Evolution Of The Water Characteristics In The Bays Along The Eastern Coast Of The Aegean Sea: Saros, İzmir, And Gökova Bays, Canan Eronat, Erdem Sayin
Turkish Journal of Earth Sciences
The seasonal and interannual variability of the local hydrography in 3 bays (Saros, İzmir, and Gökova bays) along the eastern coast of the Aegean Sea are investigated using data sets collected from 1991 to 2010. The data cover the last major deep-water formation episodes and the Eastern Mediterranean Transient (EMT) relaxation period. Aegean Sea hydrology and water mass characteristics influence the water properties of the bays. The data suggest that Saros Bay (North Aegean Sea), İzmir Bay (Central Aegean Sea), and Gökova Bay (South Aegean Sea) have different physical processes and water characteristics. They have their own dynamics independent from …
Investigation Of Fault-Related Small-Scale Fluid Flow In Geothermal Fields By Numerical Modeling, Doğa Doğan
Investigation Of Fault-Related Small-Scale Fluid Flow In Geothermal Fields By Numerical Modeling, Doğa Doğan
Turkish Journal of Earth Sciences
In this paper, hydrothermal circulations and temperature distributions in geothermal areas with fault zones are investigated. It is shown that existence of the fault zones influences both the fluid circulation patterns and velocities. Reciprocal influence of the local fluid circulations and the temperature distribution is demonstrated. A 2-dimensional square porous layer is used for modeling the geothermal field. Faults are modeled as vertical porous layers. It is assumed that faults are located inside the geothermal field and have a higher permeability than the field itself. Anisotropic and isotropic models are used to simulate the permeability structure of the faults. Several …
Analysis Of Precursory Seismicity Patterns In Zagros (Iran) By Cn Algorithm, Majid Maybodian, Mehdi Zare, Hosseyn Hamzehloo, Antonella Peresan, Anooshiravan Ansari, Giuliano F. Panza
Analysis Of Precursory Seismicity Patterns In Zagros (Iran) By Cn Algorithm, Majid Maybodian, Mehdi Zare, Hosseyn Hamzehloo, Antonella Peresan, Anooshiravan Ansari, Giuliano F. Panza
Turkish Journal of Earth Sciences
This study illustrates the application of the CN algorithm for the analysis of precursory seismicity patterns in the Zagros region (Iran), an area characterized by a complex seismotectonic setting and by remarkable seismic activity. CN is a formally defined and widely tested algorithm for intermediate-term middle-range earthquake prediction, based on the analysis of routinely compiled earthquake catalogs. To allow its application, the global and regional catalogs available for the territory of Iran have been analyzed so as to compile a data set sufficiently complete and homogeneous over a time span of about 3 decades, as required for CN application. A …
Responses Of Carbon Isotope Ratios Of C_3 Herbs To Humidity Index In Northern China, Xianzhao Liu, Qing Su, Chaokui Li, Yong Zhang, Qing Wang
Responses Of Carbon Isotope Ratios Of C_3 Herbs To Humidity Index In Northern China, Xianzhao Liu, Qing Su, Chaokui Li, Yong Zhang, Qing Wang
Turkish Journal of Earth Sciences
Uncertainties would exist in the relationship between delta^{13}C values and environmental factors such as temperature, resulting in unreliable reconstruction of paleoclimates. It is therefore important to establish a rational relationship between plant delta^{13}C and a proxy for paleoclimate reconstruction that can comprehensively reflect temperature and precipitation. By measuring the delta^{13}C of a large number of C_3 herbaceous plants growing in different climate zones in northern China and collecting early reported delta^{13}C values of C_3 herbs in this study area, the spatial features of delta^{13}C values of C_3 herbs and their relationships with humidity index were analyzed. The delta^{13}C values of …
Comparative Geochemical Study Of Soils Developed On Characteristic Black And Yellow Polymetallic Massive Sulfide Deposits In Eastern Pontides (Ne Turkey), Nezi̇hi̇ Köprübaşi, Emi̇n Çi̇ftçi̇, Sai̇t Cordan, Necla Köprübaşi, Cafer Özkul, Fatma Şi̇şman Tükel
Comparative Geochemical Study Of Soils Developed On Characteristic Black And Yellow Polymetallic Massive Sulfide Deposits In Eastern Pontides (Ne Turkey), Nezi̇hi̇ Köprübaşi, Emi̇n Çi̇ftçi̇, Sai̇t Cordan, Necla Köprübaşi, Cafer Özkul, Fatma Şi̇şman Tükel
Turkish Journal of Earth Sciences
The Harşit-Köprübaşı (Tirebolu) and Killik (Espiye) volcanogenic massive sulfide (VMS) deposits occur in the Eastern Pontide tectonic belt, one of the major tectonic units comprising Anatolia. They are hosted by Late Cretaceous dacitic to rhyolitic rocks overlain by thin layers of pelitic sediments. The region is considered as a metallogenic province since it is a host to numerous VMS deposits, mainly of the Kuroko type, with varying sizes and reserves and with fairly similar geochemical and mineralogical characteristics. In this study, 489 soil samples were systematically collected from both known mineralized sites and remote areas that have no indication of …
Chemistry Of Magmatic And Alteration Minerals In The Chahfiruzeh Porphyry Copper Deposit, South Iran: Implications For The Evolution Of The Magmas And Physicochemical Conditions Of The Ore Fluids, Morteza Einali, Saeed Alirezaei, Federica Zaccarini
Chemistry Of Magmatic And Alteration Minerals In The Chahfiruzeh Porphyry Copper Deposit, South Iran: Implications For The Evolution Of The Magmas And Physicochemical Conditions Of The Ore Fluids, Morteza Einali, Saeed Alirezaei, Federica Zaccarini
Turkish Journal of Earth Sciences
The Chahfiruzeh deposit is a newly discovered porphyry-style copper deposit in the southern part of the Cenozoic Urumieh-Dokhtar magmatic arc of Iran. Mineralization is associated with a Miocene quartz-diorite to quartz-monzodiorite porphyritic intrusion (Chahfiruzeh porphyry) intruded into older basaltic and andesitic lava flows and pyroclastic rocks. Alteration assemblages and alteration zoning, typical of porphyry copper deposits, are well developed. Mineralization occurs in quartz-sulfide stockworks and as sulfide disseminations in the porphyritic intrusion and the immediate wall rocks. Pyrite and chalcopyrite are the main hypogene sulfide minerals; bornite and molybdenite are rare. Representative magmatic and alteration minerals, including plagioclase, amphibole, biotite, …
Terebella Lapilloides Münster, 1833 From The Upper Jurassic-Lower Cretaceous İnaltı Carbonates, Northern Turkey: Its Taxonomic Position And Paleoenvironmental-Paleoecological Significance, Mustafa Yücel Kaya, Demi̇r Altiner
Terebella Lapilloides Münster, 1833 From The Upper Jurassic-Lower Cretaceous İnaltı Carbonates, Northern Turkey: Its Taxonomic Position And Paleoenvironmental-Paleoecological Significance, Mustafa Yücel Kaya, Demi̇r Altiner
Turkish Journal of Earth Sciences
The agglutinating annelid Terebella lapilloides Münster, 1833 is commonly encountered in reefal deposits from the Late Jurassic. This annelid is described and documented for the first time from the Upper Jurassic-Lower Cretaceous carbonates of the İnaltı Formation in the Central Pontides, Turkey. The whole İnaltı formation, 395 m in thickness, was studied near Bürnük village and 105 samples were collected along the section. The investigated thin sections reveal the shallow water and the reefal/fore-reefal character of the carbonates with coral-sponge frame-builders. The bioconstituents are accompanied by various microencrusters and microproblematica (such as Lithocodium aggregatum, Bacinella-type structures, Koskinobullina socialis, Radiomura cautica, …
Reservoir Characterization Of The Burqan Formation Sandstone From Midyan Basin, Northwestern Saudi Arabia, Abdulaziz Al-Laboun, Abdurrahman Al-Quraishi, Haider Zaman, Mohammed Benaafi
Reservoir Characterization Of The Burqan Formation Sandstone From Midyan Basin, Northwestern Saudi Arabia, Abdulaziz Al-Laboun, Abdurrahman Al-Quraishi, Haider Zaman, Mohammed Benaafi
Turkish Journal of Earth Sciences
The Early Miocene sandstone of the Burqan Formation from Midyan Basin is considered an oil-bearing unit. The outcrops of this sandstone, which are exposed in the northwestern part of the basin, have been studied through field and laboratory-based investigations. During the field work, 81 surface samples were collected for reservoir characterization. Laboratory analyses were undertaken to determine the effect of the diagenesis on the reservoir quality using integrated sedimentological, petrological, and petrophysical analyses. According to these analyses, the sandstone of Burqan Formation is predominately subarkosic and sublitharenite in nature, medium to course grained in size, rounded to subangular in shape, …
Santonian-Campanian Biostratigraphy Of The Kalaat Senan Area (West-Central Tunisia), Zaineb Elamri, Dalila Zaghbib-Turki
Santonian-Campanian Biostratigraphy Of The Kalaat Senan Area (West-Central Tunisia), Zaineb Elamri, Dalila Zaghbib-Turki
Turkish Journal of Earth Sciences
The Santonian-Campanian (S/C) transition in the Kalaat Senan area is well exposed in the Assila Wadi (OA) section and consists of marls with indurate glauconitic levels towards the base. Standard Mediterranean ammonite biozonations could not be applied to this section because the biomarkers are absent. However, planktonic foraminiferal biozonation is more reliable for indicating the S/C boundary, and here we propose to use the last appearance datum of Dicarinella asymetrica as the index marker of this boundary. A high-resolution quantitative analysis of the planktonic foraminifera of the OA section allows us to define the main bioevents across the S/C transition …
Development Of A Numerical 2-Dimensional Beach Evolution Model, Cüneyt Baykal
Development Of A Numerical 2-Dimensional Beach Evolution Model, Cüneyt Baykal
Turkish Journal of Earth Sciences
This paper presents the description of a 2-dimensional numerical model constructed for the simulation of beach evolution under the action of wind waves only over the arbitrary land and sea topographies around existing coastal structures and formations. The developed beach evolution numerical model is composed of 4 submodels: a nearshore spectral wave transformation model based on an energy balance equation including random wave breaking and diffraction terms to compute the nearshore wave characteristics, a nearshore wave-induced circulation model based on the nonlinear shallow water equations to compute the nearshore depth-averaged wave-induced current velocities and mean water level changes, a sediment …
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Turkish Journal of Earth Sciences
The neotectonics of the Zanjan-Kazvin area are dominated by the region-wide E-W trending left lateral strike-slip faults. These faults create restraining and releasing stepovers indicating strain partitioning. Instead of the NW-SE trending long range-parallel continuous thrust faulting suggested in previous studies, this paper demonstrates that there are E-W trending range-crossing left lateral strike-slip faults creating short range-parallel thrust faults in the restraining stepovers. Establishing this strike-slip-induced structural style might contribute to an understanding of the nature of the Elburz (Alborz) Mountains located between the Central Iran and Caspian blocks.
Experimental Investigation Of Mixtures Of Bentonite And Dredged Sediments From Chorfa Dam In Algeria, Zehour Labiod - Aloui, Habib Trouzine, Moulay Smaine Ghembaza, Tahar Nouioua, Yahya Sebaibi
Experimental Investigation Of Mixtures Of Bentonite And Dredged Sediments From Chorfa Dam In Algeria, Zehour Labiod - Aloui, Habib Trouzine, Moulay Smaine Ghembaza, Tahar Nouioua, Yahya Sebaibi
Turkish Journal of Earth Sciences
Geotechnical properties of dredged sediment from Chorfa dam in Algeria and their mixtures (5%, 10%, 15%, 20%, and 25%) with bentonite were investigated through a series of laboratory experimental tests in order to investigate possibilities of their usage as a barrier against the spread out of the Sebkha of Oran in the northwest of Algeria. Grain size and Atterberg limits tests, chemical and mineral analyses, and compaction, vertical swelling, and horizontal and vertical permeability tests were performed on the soils and their mixtures using tap water and the salty Sebkha water. The results indicate that the bentonite specimens remolded and …
Miocene Palynoflora Of The Kocaçay And Cumaovası Basins: A Contribution To The Synthesis Of Miocene Palynology, Palaeoclimate, And Palaeovegetation In Western Turkey, Mi̇ne Sezgül Kayseri̇ Özer, Hasan Sözbi̇li̇r, Funda Akgün
Miocene Palynoflora Of The Kocaçay And Cumaovası Basins: A Contribution To The Synthesis Of Miocene Palynology, Palaeoclimate, And Palaeovegetation In Western Turkey, Mi̇ne Sezgül Kayseri̇ Özer, Hasan Sözbi̇li̇r, Funda Akgün
Turkish Journal of Earth Sciences
Palynofloras of the Kocaçay and Cumaovası basins in western Turkey that belong to a time-span from the late Early to late Middle Miocene (the late Burdigalian-Serravallian) are studied and compared with published palynofloras of Europe and Turkey. Palynological data and numerical climatic results obtained by the coexistence approach indicate palaeoclimate changed from warm subtropical to temperate during the late Burdigalian-Serravallian. Moreover, the palaeoclimates of the Kocaçay and Cumaovası basins are compared with continental palaeoclimatic records of coal-bearing sediments in western Turkey and current temperatures in the İzmir region. According to this comparison, palaeoclimatic results of these basins and other localities …
Appraisal Of Active Tectonics Using Dem-Based Hypsometric Integral And Trend Surface Analysis In Emilia-Romagna Apennines, Northern Italy, Saima Siddiqui, Mauro Soldati
Appraisal Of Active Tectonics Using Dem-Based Hypsometric Integral And Trend Surface Analysis In Emilia-Romagna Apennines, Northern Italy, Saima Siddiqui, Mauro Soldati
Turkish Journal of Earth Sciences
The hypsometric integral (HI) has generally been used to explain the stages of landscape evolution and erosional processes. It is an important tool to investigate tectonics and lithologic and climatic effects on topographic change. We analyzed the significance of the HI to investigate active tectonics in the Emilia-Romagna Apennines of northern Italy. We used a digital elevation model of 5-m spatial resolution to calculate grid-based HI values. The HI distribution does not show clear spatial patterns of high and low HI values. However, when statistical methods of local indices of spatial autocorrelation were applied, it was possible to identify clear …
Testing Of The Recently Developed Tectonomagmatic Discrimination Diagrams From Hydrothermally Altered Igneous Rocks Of 7 Geothermal Fields, Kailasa Pandarinath
Testing Of The Recently Developed Tectonomagmatic Discrimination Diagrams From Hydrothermally Altered Igneous Rocks Of 7 Geothermal Fields, Kailasa Pandarinath
Turkish Journal of Earth Sciences
Recently developed multidimensional tectonomagmatic discrimination diagrams based on log-ratio variables of chemical elements, discordant outlier-free databases, and probability-based boundaries have been shown to work better than the earlier diagrams. Hydrothermally altered drilled well rock cuttings obtained from different depths of geothermal fields were used to test these diagrams to compare the inferred tectonic setting with the expected one. In spite of the hydrothermal alteration effects, these diagrams provided the following expected tectonic settings: (1) an arc setting for Ahuachapán and Berlin geothermal fields, El Salvador; (2) a rift setting for Cerro Prieto geothermal field, Mexico, and Tendaho geothermal field, Afar …
Geology, Mineralogy, Geochemistry, And Depositional Environment Of A Late Miocene/Pliocene Fluviolacustrine Succession, Cappadocian Volcanic Province, Central Anatolia, Turkey, Ersel Göz, Selahatti̇n Kadi̇r, Ali̇ Gürel, Muhsi̇n Eren
Geology, Mineralogy, Geochemistry, And Depositional Environment Of A Late Miocene/Pliocene Fluviolacustrine Succession, Cappadocian Volcanic Province, Central Anatolia, Turkey, Ersel Göz, Selahatti̇n Kadi̇r, Ali̇ Gürel, Muhsi̇n Eren
Turkish Journal of Earth Sciences
This paper investigates the mineralogy, geochemistry, and depositional environment of Late Miocene/Pliocene fluviolacustrine deposits, including multiple ignimbrite levels and andesitic and basaltic lavas, within the Cappadocian Volcanic Province (CVP) of central Anatolia, Turkey. Palaeosols and calcretes formed within these terrestrial sedimentary rocks under near-surface or surface conditions. The palaeosols are composed predominantly of smectite ± illite with feldspar, quartz, calcite, opal-CT, and amphibole, and the calcretes mainly of calcite with minor feldspar, quartz, and accessory smectite ± palygorskite. The palygorskite occurs on and between the calcite crystals in the calcretes and at the edges of smectite flakes within the palaeosols, …
Whole-Rock Geochemistry Of Basic And Intermediate Intrusive Rocks In The Ishiagu Area: Further Evidence Of Anorogenic Setting Of The Lower Benue Rift, Southeastern Nigeria, Anthony Chukwu, Smart Chika Obiora
Whole-Rock Geochemistry Of Basic And Intermediate Intrusive Rocks In The Ishiagu Area: Further Evidence Of Anorogenic Setting Of The Lower Benue Rift, Southeastern Nigeria, Anthony Chukwu, Smart Chika Obiora
Turkish Journal of Earth Sciences
Petrographic studies on the intrusive rocks from the Ishiagu area show that they are gabbro, dolerites, and diorite. The gabbro and diorite occur as stocks while the dolerites occur as sills in folded sedimentary sequence predominated by shale. Geochemical data confirmed the rocks as basic (gabbro and dolerites) and intermediate (diorite) rocks with silica contents ranging from 42.45 to 50.75 wt.% and 55.03 to 60.24 wt.%, respectively. They are predominantly alkaline (gabbro, dolerites, and diorites) with sparse tholeiites (few gabbro). The basic rocks are made up of calcic plagioclase (An_{49-54}), clinopyroxene, olivine (altered), nepheline, and opaques, while the intermediate rocks …
Tectonosedimentary Evolution Of The Karacasu And Bozdoğan Basins In The Central Menderes Massif, W Anatolia, Faruk Ocakoğlu, Sanem Açikalin, Erman Özsayin, Ramazan Kadi̇r Di̇ri̇k
Tectonosedimentary Evolution Of The Karacasu And Bozdoğan Basins In The Central Menderes Massif, W Anatolia, Faruk Ocakoğlu, Sanem Açikalin, Erman Özsayin, Ramazan Kadi̇r Di̇ri̇k
Turkish Journal of Earth Sciences
The Karacasu and Bozdoğan basins, which trend obliquely to modern grabens in the Central Menderes Massif, are investigated in terms of morphology, basinfill architecture, and structure. Evaluation of the previous geophysical and new structural data indicates that the basins are symmetrical grabens mostly running in a N-S direction. Analysis of sedimentary facies of the basins infill supports the simple graben model by revealing lateral alluvial/colluvial fans in basin margins and axial fluvial/lacustrine environments in a central trough. The long-term changes between fluvial and lacustrine conditions in the basins are attributed to paleoclimatic origin. Paleostress analysis of slickensides substantiates that the …
First Report Of Sphaeronitid Blastozoans (Echinodermata) In The Middle Ordovician Of The Taurides, Turkey, Elise Nardin, Mehmet Cemal Göncüoğlu, Bertrand Lefebvre
First Report Of Sphaeronitid Blastozoans (Echinodermata) In The Middle Ordovician Of The Taurides, Turkey, Elise Nardin, Mehmet Cemal Göncüoğlu, Bertrand Lefebvre
Turkish Journal of Earth Sciences
Articulated echinoderm remains are described for the first time in the Ordovician of Turkey. They occur massively, forming a relatively thick cystoid bed within the detrital limestone succession of the Sobova Formation (latest Dapingianearliest Darriwilian) in the western Taurus Mountains. The cystoid bed encompasses a monospecific echinoderm assemblage of densely packed, 3-dimensionally preserved thecae. The presence of numerous suborganised plates with diplopore respiratory structures suggests probable affinities with sphaeronitid blastozoans. Comparable sphaeronitid dense beds are well known in the early Darriwilian of Baltica, and in the mid Darriwilian of the Middle East and Asian terranes.
Probabilistic Earthquake Hazard Assessment For Ankara And Its Environs, Bülent Özmen, Berna Burçak Başbuğ Erkan
Probabilistic Earthquake Hazard Assessment For Ankara And Its Environs, Bülent Özmen, Berna Burçak Başbuğ Erkan
Turkish Journal of Earth Sciences
The capital and the second largest city of Turkey, Ankara, is generally considered to be safe in terms of seismic activities and earthquake hazard. However, recent studies and earthquakes experienced in the region showed that Ankara is not indeed seismically safe. As the number of studies on Ankaras seismic hazard increases, the number of scientists who claim that the earthquake hazard in Ankara is higher than expected also increases. However, to date no detailed analysis has been undertaken as to the earthquake hazard facing Ankara. This study has compiled data from the earthquake catalogues available in Turkey and employed the …