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Articles 451 - 480 of 917
Full-Text Articles in Earth Sciences
Quartz-Mica Schist And Gneiss Hosted Clay Deposits Within The Yenipazar(Yozgat, Central Anatolia) Volcanogenic Massive Sulfide Ore, Şih Ali̇ Sayin
Quartz-Mica Schist And Gneiss Hosted Clay Deposits Within The Yenipazar(Yozgat, Central Anatolia) Volcanogenic Massive Sulfide Ore, Şih Ali̇ Sayin
Turkish Journal of Earth Sciences
The Yenipazar deposit of volcanogenic sulfide occurrence, situated approximately 9 km SW of Yenipazar, is hosted in quartz-muscovite schists and gneiss. Following the Late Cretaceous, the quartz-mica schists and gneiss have been altered to clay minerals, resulting in important kaolin deposits. The clay deposits consist mainly of halloysite, kaolinite, smectite, illite, muscovite, chlorite, and α-quartz. Biotite, alunite, jarosite, pyrite, hematite, calcite, low cristobalite, and feldspar are present in minor amounts. In places, some mixed-layer clays, such as kaolinite/smectite and smectite/illite, are also observed within the clay deposits. Barite is present in a few clay samples. α-Quartz is the dominant silica …
Nummulitic Facies Of The Crimean-Caucasian Region, Ekaterina A. Lygina, Pavel A. Fokin, Ludmila F. Kopaevich, Anatoly M. Nikishin, Elena V. Yakovishina
Nummulitic Facies Of The Crimean-Caucasian Region, Ekaterina A. Lygina, Pavel A. Fokin, Ludmila F. Kopaevich, Anatoly M. Nikishin, Elena V. Yakovishina
Turkish Journal of Earth Sciences
The nummulitic limestones of Crimea and the southwestern Caucasus, often interpreted as "nummulite banks", formed carbonate platforms throughout most of the Ypresian-Lutetian. Such deposits were accumulated in shallow warm-water basins of Crimea and the Caucasus, which differed from each other by the structure of the basement and the hydrodynamic regime. The Crimean carbonate platform was relatively flat and was formed mainly within quiet hydrodynamic conditions below the fair-weather wave base (less than 50 m). The facies changes within it reflect variations in water depth. Facies distinguished there form the nummulite bank, its lee-side slope, the shelf plain in the rear …
Comparison Between Natural Radioactivity Levels Andgeochemistry Of Some Granitoids In Western Turkey, Si̇bel Tatar Erkül, Süleyman Fati̇h Özmen, Fuat Erkül, İsmai̇l Boztosun
Comparison Between Natural Radioactivity Levels Andgeochemistry Of Some Granitoids In Western Turkey, Si̇bel Tatar Erkül, Süleyman Fati̇h Özmen, Fuat Erkül, İsmai̇l Boztosun
Turkish Journal of Earth Sciences
Granitoids commonly include K-feldspar, biotite and zircon, apatite, titanite, allanite, and xenotime crystals, which are known to contain common radioactive elements. Radioactive isotopes of 40K, 238U, and 232Th can be harmful to human health with increasing dosage and their quantification should be well defined to assess the suitability of wall-rock granitoids for indoor and outdoor purposes. In this study, it is aimed to correlate the possible relationship between concentrations of natural radionuclides and SiO2, Na2O, K2O, and CaO together with elements U, Th, Zr, Y, Ba, Rb, and Sr to provide a basic approach to the compatibility of geochemical data …
The New Empirical Magnitude Conversion Relations Using An Improved Earthquake Catalogue For Turkey And Its Near Vicinity (1900-2012), Fi̇li̇z Tuba Kadi̇ri̇oğlu, Recai̇ Feyi̇z Kartal
The New Empirical Magnitude Conversion Relations Using An Improved Earthquake Catalogue For Turkey And Its Near Vicinity (1900-2012), Fi̇li̇z Tuba Kadi̇ri̇oğlu, Recai̇ Feyi̇z Kartal
Turkish Journal of Earth Sciences
Empirical magnitude conversion relationships are one of the important parameters for not only seismological studies but also seismic hazard analysis and development of the attenuation relationships. Particularly, for seismic hazard analysis, conversion of various types of magnitudes to moment magnitude, which is the most reliable and common magnitude scale, is a key requirement. Within this scope, different magnitude conversion equations have been derived by various researchers in the literature. In this study, new empirical magnitude conversion formulas for conversion from mb, ML, Md, and MS to Mw were derived by using a recently established earthquake catalogue. The most important feature …
Mineralogy, Geochemistry, And Depositional Environment Of The Beduh Shale(Lower Triassic), Northern Thrust Zone, Iraq, Faraj Tobia, Sirwa Shangola
Mineralogy, Geochemistry, And Depositional Environment Of The Beduh Shale(Lower Triassic), Northern Thrust Zone, Iraq, Faraj Tobia, Sirwa Shangola
Turkish Journal of Earth Sciences
Integrated mineralogical and geochemical methods are utilized to investigate the provenance, paleoweathering, and depositional setting of shale from the Lower Triassic Beduh Formation in the Northern Thrust Zone, Iraq. The ~64-m-thick Beduh Formation consists of calcareous shale and marl intercalations with thin calcareous sandstone interbeds. X-ray diffraction analysis revealed that clay minerals comprise illite, kaolinite, and chlorite, with a minor mixed layer of illite/smectite and illite/chlorite. Calcite and quartz are the main nonclay species with subordinate amounts of feldspar and hematite. The mineralogical and geochemical parameters of the shale (e.g., high content of illite and moderate illite crystallinity index, Al2O3/TiO2, …
Mineral Chemistry Of Igneous Rocks In The Lar Cu-Mo Prospect, Southeastern Part Of Iran: Implications For P, T, And ÆO2, Rahele Moradi, Mohammad Boomeri, Sasan Bagheri, Kazuo Nakashima
Mineral Chemistry Of Igneous Rocks In The Lar Cu-Mo Prospect, Southeastern Part Of Iran: Implications For P, T, And ÆO2, Rahele Moradi, Mohammad Boomeri, Sasan Bagheri, Kazuo Nakashima
Turkish Journal of Earth Sciences
The Lar Cu-Mo prospect is located 20 km north of Zahedan in Sistan and Baluchestan Province. This area is geologically situated in the Sistan Suture Zone. The Cu-Mo mineralization occurs as silicic veins in the Lar igneous rocks and includes hypogene chalcopyrite, bornite, and molybdenite mineralization. The syenite to monzonite host rocks occur as stock and dyke and display granular to porphyritic texture. In this study, mineral chemistry and petrographic examination of igneous rocks are used to constrain the crystallization conditions of the magma. The compositional range of plagioclase is relatively narrow (0.11%-26.05% An), whereas that of potassium feldspar is …
Geochemistry And C, O, And Sr Isotope Composition Of The Föderata Group Metacarbonates (Southern Veporicum, Western Carpathians, Slovakia):Constraints On The Nature Of Protolith And Its Depositional Environment, Marek Vdacny, Peter Ruzicka, Anna Vozarova
Geochemistry And C, O, And Sr Isotope Composition Of The Föderata Group Metacarbonates (Southern Veporicum, Western Carpathians, Slovakia):Constraints On The Nature Of Protolith And Its Depositional Environment, Marek Vdacny, Peter Ruzicka, Anna Vozarova
Turkish Journal of Earth Sciences
Major, trace, and rare earth element as well as C, O, and Sr isotope geochemistry is used to provide new insights into the characteristics and depositional environment of the protolith of the Föderata Group metacarbonates in the southern Veporicum cover sequence (Western Carpathians, Slovakia). The metacarbonates are characterized by high LOI and CaO and by small contents of various insoluble components. Among the trace elements investigated, only As, Ba, Co, Cu, Hg, Nb, Ni, Pb, Rb, Sb, Sr, Th, U, Y, Zn, and Zr display concentrations beyond their detection limits. The metacarbonates are strongly depleted in Rb, Ba, Th, Nb, …
Strike-Slip Neotectonic Regime And Related Structures In The Cappadocia Region: A Case Study In The Salanda Basin, Central Anatolia, Turkey, Ali̇ Koçyi̇ği̇t, Uğur Doğan
Strike-Slip Neotectonic Regime And Related Structures In The Cappadocia Region: A Case Study In The Salanda Basin, Central Anatolia, Turkey, Ali̇ Koçyi̇ği̇t, Uğur Doğan
Turkish Journal of Earth Sciences
The study area is a strike-slip basin of approximately 1-9 km wide, 66 km long and N65°W trending, located between the historical Kesikköprü in the west and the Sarıhıdır settlement in the east along the northern side of the Central Anatolian Volcanic Province. It was evolved on a regional erosional surface of a pre-Quaternary volcanosedimentary sequence during Quaternary. This is evidenced by the stratigraphical, structural, and seismic data. The total amounts of throw and dextral strike-slip displacement accumulated on the basin-boundary faults during the evolutionary history of the basin are 178 m and 5 km, respectively. The average slip rate …
Geochemistry Of Travertine Deposits In The Eastern Anatolia District: An Example Of The Karakoçan-Yoğunağaç (Elazığ) And Mazgirt-Dedebağ (Tunceli) Travertines, Turkey, Leyla Kalender, Özlem Özteki̇n Okan, Murat İnceöz, Bahatti̇n Çeti̇ndağ, Vesi̇le Yildirim
Geochemistry Of Travertine Deposits In The Eastern Anatolia District: An Example Of The Karakoçan-Yoğunağaç (Elazığ) And Mazgirt-Dedebağ (Tunceli) Travertines, Turkey, Leyla Kalender, Özlem Özteki̇n Okan, Murat İnceöz, Bahatti̇n Çeti̇ndağ, Vesi̇le Yildirim
Turkish Journal of Earth Sciences
The Karakoçan-Yoğunağaç (Elazığ) and Mazgirt-Dedebağ (Tunceli) travertines, which are related to thermal springs, are situated on the right-lateral strike-slip Karakoçan Fault Zone (KFZ) and left-lateral strike-slip Pamuklu Fault Zone (PFZ) in eastern Anatolia. The surface area of the travertines varies from m2 to km2. Morphologically, the travertines are classified as ridge, banded, and terrace types due to deposition in different ways, in the releasing/restraining bends of the KFZ and PFZ and on the segments of faults. The banded travertines were dated by U-series, and an age of 160,000 ± 76 years was determined in only one sample from the Mazgirt-Dedebağ …
Late Holocene Palaeoenvironmental Evolution Of The Northern Harbour At The Elaiussa Sebaste Archaeological Site (South-Eastern Turkey): Evidence From Core Ela6, Romana Melis, Maria Pia Bernasconi, Ester Colizza, Federico Di Rita, Eugenia Equini Schneider, Emanuele Forte, Maria Eugenia Montenegro, Nevio Pugliese, Marco Ricci
Late Holocene Palaeoenvironmental Evolution Of The Northern Harbour At The Elaiussa Sebaste Archaeological Site (South-Eastern Turkey): Evidence From Core Ela6, Romana Melis, Maria Pia Bernasconi, Ester Colizza, Federico Di Rita, Eugenia Equini Schneider, Emanuele Forte, Maria Eugenia Montenegro, Nevio Pugliese, Marco Ricci
Turkish Journal of Earth Sciences
No abstract provided.
The Case Of The Carbonatite-Like Dyke Of The Madenska River Complex At The Kriva Lakavica Section In The Republic Of Macedonia: Oxygen And Carbon Isotopic Constraints, Matej Dolenec, Todor Serafimovski, Nina Daneu, Tadej Dolenec, Nastja Rogan Smuc, Petra Vrhovnik, Sonja Lojen
The Case Of The Carbonatite-Like Dyke Of The Madenska River Complex At The Kriva Lakavica Section In The Republic Of Macedonia: Oxygen And Carbon Isotopic Constraints, Matej Dolenec, Todor Serafimovski, Nina Daneu, Tadej Dolenec, Nastja Rogan Smuc, Petra Vrhovnik, Sonja Lojen
Turkish Journal of Earth Sciences
The oxygen and carbon isotope compositions of carbonate samples from the carbonatite-like dyke of the Madenska River complex at the Kriva Lakavica section, samples of calcite skarns from the Damjan Fe-ore deposit and the Sasa Pb-Zn ore deposit, and samples of marbles from the Pohorje Mountains were analyzed to provide critical evidence in favor of the magmatic or sedimentary origin of this carbonatite-like dyke. We suggest that the carbonatite-like dyke is not a "normal" carbonatite, but instead represents melted carbonates, which can be associated with an unexposed, deep-seated, causative magmatic body. This dyke has a fluidal texture and carries xenoliths …
Estimating Depth To The Bottom Of Magnetic Sources At Wikki Warm Spring Region, Northeastern Nigeria, Using Fractal Distribution Of Sources Approach, Ema Michael Abraham, Ene Grace Obande, Mbazor Chukwu, Chibuzo Gabriel Chukwu, Mkpuma Rock Onwe
Estimating Depth To The Bottom Of Magnetic Sources At Wikki Warm Spring Region, Northeastern Nigeria, Using Fractal Distribution Of Sources Approach, Ema Michael Abraham, Ene Grace Obande, Mbazor Chukwu, Chibuzo Gabriel Chukwu, Mkpuma Rock Onwe
Turkish Journal of Earth Sciences
No abstract provided.
Geodynamic Evolution Of The Sanandaj-Sirjan Zone, Zagros Orogen, Iran, Javad Mehdipour Ghazi, Mohssen Moazzen
Geodynamic Evolution Of The Sanandaj-Sirjan Zone, Zagros Orogen, Iran, Javad Mehdipour Ghazi, Mohssen Moazzen
Turkish Journal of Earth Sciences
No abstract provided.
Provenance, Diagenesis, Tectonic Setting, And Geochemistry Of Hawkesbury Sandstone (Middle Triassic), Southern Sydney Basin, Australia, Samir Mahmoud Zaid, Fahad Al Gahtani
Provenance, Diagenesis, Tectonic Setting, And Geochemistry Of Hawkesbury Sandstone (Middle Triassic), Southern Sydney Basin, Australia, Samir Mahmoud Zaid, Fahad Al Gahtani
Turkish Journal of Earth Sciences
The Hawkesbury Sandstone is an important groundwater reservoir in the southern part of the Sydney Basin, Australia. However, its diagenesis and provenance and its impact in reservoir quality are virtually unknown. The present study aims to reconstruct the parent rock assemblages of the Hawkesbury Sandstone, their tectonic provenance, and the physiographic conditions under which these sediments were deposited. Samples from the EAW 18a and EDEN 115 field representing the Middle Triassic Hawkesbury Sandstone were studied using a combination of petrographic, mineralogical, and geochemical techniques. The Hawkesbury Sandstone is yellowish brown in color, siliceous, and partly calcareous; it originated as sands …
Evidence Of An Active Glacier In The Munzur Mountains, Eastern Turkey, Ci̇han Bayrakdar, Zeynel Çilğin, Mehmet Fati̇h Döker, Ergi̇n Canpolat
Evidence Of An Active Glacier In The Munzur Mountains, Eastern Turkey, Ci̇han Bayrakdar, Zeynel Çilğin, Mehmet Fati̇h Döker, Ergi̇n Canpolat
Turkish Journal of Earth Sciences
The Munzur Mountains were subjected to extensive and repeated glaciations during the Pleistocene. The presence of an active glacier in the region was not verified until this study. Here, we used remote sensing methods to identify and locate the glaciers and verified the activity of the largest glacier in the field. We named this glacier the Şahintaşı Glacier and studied it using 3D ArcGIS spatial analyses overlaid on high-resolution Geographical Information Systems (GIS) satellite images. The most current version of LANDSAT 8 (acquired on 14.08.2013) supplied the remote sensing information. We used principal component analysis on the data. The precise …
Determining The Main Strand Of The Eskişehir Strike-Slip Fault Zone Using Subsidiary Structures And Seismicity: A Hypothesis Tested By Seismic Reflection Studies, Gürol Seyi̇toğlu, Gali̇p Berkan Ecevi̇toğlu, Bülent Kaypak, Yücel Güney, Muammer Tün, Korhan Esat, Uğur Avdan, Abi̇di̇n Temel, Alper Çabuk, Sevgi̇ Telsi̇z, Güzi̇n Gülsev Uyar Aldaş
Determining The Main Strand Of The Eskişehir Strike-Slip Fault Zone Using Subsidiary Structures And Seismicity: A Hypothesis Tested By Seismic Reflection Studies, Gürol Seyi̇toğlu, Gali̇p Berkan Ecevi̇toğlu, Bülent Kaypak, Yücel Güney, Muammer Tün, Korhan Esat, Uğur Avdan, Abi̇di̇n Temel, Alper Çabuk, Sevgi̇ Telsi̇z, Güzi̇n Gülsev Uyar Aldaş
Turkish Journal of Earth Sciences
The Eskişehir Fault Zone is one of the major neotectonic structures of Turkey, extending from İnegöl (Bursa) to Cihanbeyli (Konya). The fault zone presents a considerable seismic risk for the city of Eskişehir but the exact locations of active segments and the source of the major seismic event, the 1956 earthquake (M = 6.5) that occurred in the instrumental period (from 1900 to 2013), have been debated in recent literature. The structural data obtained from field studies indicate an approximately N60W-trending main strand of the right lateral strike-slip Eskişehir Fault Zone. This trend corresponds to the en echelon bends on …
Calcareous Nannofossils Of The Paleocene Eocene Transition In Four Sections From Egypt, Mahmoud Faris, Sherif Farouk
Calcareous Nannofossils Of The Paleocene Eocene Transition In Four Sections From Egypt, Mahmoud Faris, Sherif Farouk
Turkish Journal of Earth Sciences
A detailed analysis of calcareous nannofossil assemblages was carried out across the Paleocene-Eocene transition in four outcrops in Egypt (the Gebel Matulla, Markha, El-Quss Abu Said, and Gebel Duwi sections) that span the Discoaster multiradiatus (NP9) to Discoaster binodosus (NP11) zones. The Paleocene-Eocene (P/E) boundary is placed in the lower part of the Esna Shale Formation based on the LOs of the Calcareous Nannofossil Excursion Taxa (CNET or RD) that define the base of NP9b. The studied sections are considered complete and document the Paleocene-Eocene Thermal Maximum (PETM). The occurrences of long-armed and asymmetrical discoasters (e.g., D. araneus, D. anartios) …
An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k
An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k
Turkish Journal of Earth Sciences
Lower-middle Devonian iron-bearing successions were studied along 2 measured stratigraphic sections in the Çamdağ region of NW Anatolia. Ironstones in the upper part of the Fındıklı Formation in Kabalakdere are characterized by alternating red and green mudstones and sandstones at the bottom, followed by a series of dolomite, dolomitic limestone with oolitic ironstones, and chamositic mudstones at the top. Conodonts from these carbonates indicate the delta-pesavis zones of the late Lochkovian. The 12- to 45-m-thick Ferizli Formation unconformably overlies the Fındıklı Formation with a quartz-arenite succession at the bottom. The formation comprises alternating red, iron-rich limestones and dolomitic limestones, where …
Discovery Of Hiatus In Feixianguan Formation And Its Geological Implications, Sichuan Basin, Sw China, Yang Yu, Xiucheng Tan, Peiyuan Chen, Huiting Yang, Teng Ma, Jian Cao, Xiuju Jin
Discovery Of Hiatus In Feixianguan Formation And Its Geological Implications, Sichuan Basin, Sw China, Yang Yu, Xiucheng Tan, Peiyuan Chen, Huiting Yang, Teng Ma, Jian Cao, Xiuju Jin
Turkish Journal of Earth Sciences
The lower Triassic Feixianguan Formation of the Sichuan Basin is an important exploration target for marine natural gas in China. It is widely believed that a certain interval from Fei 1 to Fei 4 displays conformable contacts rather than long-term wide-ranging hiatus. However, 2 denudational interfaces on the top of Member Fei 1 and Fei 2 respectively were found in the present work, which relies on the delicate core observation of 4 cored wells in Puguang Gas Field, microscopic observations of microsamples in terms of thin sections, scanning electron microscopy and cathodoluminescence, and geochemical testing. Evidence indicates that on the …
Thermal Structure Of Low-Grade Accreted Lower Cretaceous Distal Turbidites, The Central Pontides, Turkey: Insights For Tectonic Thickening Of An Accretionary Wedge, Mesut Aygül, Aral I. Okay, Roland Oberhänsli, Martin A. Ziemann
Thermal Structure Of Low-Grade Accreted Lower Cretaceous Distal Turbidites, The Central Pontides, Turkey: Insights For Tectonic Thickening Of An Accretionary Wedge, Mesut Aygül, Aral I. Okay, Roland Oberhänsli, Martin A. Ziemann
Turkish Journal of Earth Sciences
No abstract provided.
Present State Of Knowledge And New Geochemical Constraints On The Central Part Of The Mexican Volcanic Belt And Comparison With The Central American Volcanic Arc In Terms Of Near And Far Trench Magmas, Surendra Pal Verma
Turkish Journal of Earth Sciences
No abstract provided.
Calcareous Nannoplankton Changes During The Paleocene-Eocene Thermal Maximum In West Central Sinai, Egypt, Mahmoud Faris, Ibrahim Mohamed Ghandour, Esam Zahran, Gamal Mosa
Calcareous Nannoplankton Changes During The Paleocene-Eocene Thermal Maximum In West Central Sinai, Egypt, Mahmoud Faris, Ibrahim Mohamed Ghandour, Esam Zahran, Gamal Mosa
Turkish Journal of Earth Sciences
No abstract provided.
Assessment Of Seismic Hazard In The Erzincan (Turkey) Region: Construction Of Local Velocity Models And Evaluation Of Potential Ground Motions, Aysegul Askan, Shaghayegh Karimzadeh, Michael Asten, Nazan Kiliç, Fatma Nurten Şi̇şman, Cenk Erkmen
Assessment Of Seismic Hazard In The Erzincan (Turkey) Region: Construction Of Local Velocity Models And Evaluation Of Potential Ground Motions, Aysegul Askan, Shaghayegh Karimzadeh, Michael Asten, Nazan Kiliç, Fatma Nurten Şi̇şman, Cenk Erkmen
Turkish Journal of Earth Sciences
No abstract provided.
Petrography And Geochemistry Of The Kamlial Formation, Southwestern Kohat Plateau, Pakistan: Implications For Paleoclimate Of The Western Himalayas, Kafayat Ullah, Mohammad Arif, Muhammad Tahir Shah
Petrography And Geochemistry Of The Kamlial Formation, Southwestern Kohat Plateau, Pakistan: Implications For Paleoclimate Of The Western Himalayas, Kafayat Ullah, Mohammad Arif, Muhammad Tahir Shah
Turkish Journal of Earth Sciences
The Middle to Late Miocene Kamlial Formation that largely consists of sandstone and interbedded clay/mudstone sequences is exposed in the southwestern part of the Kohat plateau, which constitutes the westernmost extension of the Himalayan Foreland Basin. Whereas the sandstone is gray to brownish gray, fine- to medium-grained, and mostly thick-bedded, the interbedded clay/mudstone sequence is brownish gray to maroon red and occurs as continuous beds as well as lenses. Some mudstone/clay beds are bioturbated and seem to be pedogenic surfaces. Results of geochemical investigation of fresh (unaltered) representative sandstone and mudstone samples from three different sections of the formation in …
Petrography And Geochemistry Of Pharaonic Sandstone Monuments In Tall San Al Hagr, Al Sharqiya Governorate, Egypt: Implications For Provenance And Tectonic Setting, Samir Mahmoud Zaid, Oussama El Badry, Fatma Ramadan, Mahmoud Mohamed
Petrography And Geochemistry Of Pharaonic Sandstone Monuments In Tall San Al Hagr, Al Sharqiya Governorate, Egypt: Implications For Provenance And Tectonic Setting, Samir Mahmoud Zaid, Oussama El Badry, Fatma Ramadan, Mahmoud Mohamed
Turkish Journal of Earth Sciences
Petrographic and major and trace element compositions of Tanis sandstones from Tall San Al Hagr, Al Sharqiya Governorate, Egypt, have been investigated to determine their source, provenance, intensity of paleoweathering of the source rocks, and tectonic setting. Tanis sandstones are yellowish brown in color, siliceous, partly calcareous, and originated from sands deposited in fluvial channels. Texturally, Tanis sandstones are medium- to very coarse-grained, mature, and moderately sorted. Scarcity of feldspars indicates that the sandstone is extensively recycled from a distant source. Their average modal composition (Q99.75F0.03L0.22) classifies them as quartz arenites (quartzite), which is consistent with the geochemical study. Chemical …
Petrography And Palynology Of Late Oligocene And Middle Miocene Coals In The Gelibolu Peninsula, Nw Turkey, Ferdi̇ Demi̇rtaş, Mustafa Bozcu, Erdal Koşun, Mehmet Serkan Akki̇raz
Petrography And Palynology Of Late Oligocene And Middle Miocene Coals In The Gelibolu Peninsula, Nw Turkey, Ferdi̇ Demi̇rtaş, Mustafa Bozcu, Erdal Koşun, Mehmet Serkan Akki̇raz
Turkish Journal of Earth Sciences
In this study, coal samples from two different coal zones located close to each other were examined. They occur in the Late Oligocene Osmancık and Miocene Gazhanedere formations in the Gelibolu peninsula, in the SW part of the Thrace Basin (NW Turkey). This paper focuses on the organic-petrographic composition and depositional conditions of the two coal zones by using coal petrography, including maceral ratios, and palynology. The maceral composition of the Oligocene coal samples is similar to that of the Miocene coal samples. The coal samples from both locations are characterized by a high content of huminite group macerals, ranging …
Lower Devonian Trace Fossils And Their Paleoenvironmental Significance From The Western Yangtze Plate, South China, Li-Jun Zhang, Zhao Zhao
Lower Devonian Trace Fossils And Their Paleoenvironmental Significance From The Western Yangtze Plate, South China, Li-Jun Zhang, Zhao Zhao
Turkish Journal of Earth Sciences
Abundant and diverse trace fossils occur in the littoral-neritic sediments recording an Early Devonian transgression in South China. The well-exposed Ganxi section is located in the Longmen Mountain 100 km northwest of Chendu, Sichuan. The Lower Devonian strata are dominated by sandstones, siltstones, muddy shales, limestones, bioclastic limestones, and muddy limestones. About thirteen ichnogenera were systematically described, including Arenicolites, ?Balanoglossites, Chondrites, Cylindrichnus, Diplocraterion, Planolites, Palaeophycus, Phycodes, Rhizocorallium, Rusophycus, Skolithos, Thalassinoides, and Zoophycos. Six trace fossil associations under different sedimentary environments have been recognized as follows: the Skolithos and Diplocraterion-Skolithos associations mainly consist of domichnia derived from a high-energy zone of …
Origin, Evolution, And Tectonic Setting Of The Eastern Part Of The Mexican Volcanic Belt And Comparison With The Central American Volcanic Arc From Conventional Multielement Normalized And New Multidimensional Discrimination Diagrams And Discordancy And Significance Tests, Surendra P. Verma
Turkish Journal of Earth Sciences
If both the Mexican Volcanic Belt (MVB) and the Central American Volcanic Arc (CAVA) have been related to the subduction of the Cocos plate beneath the North American and Caribbean plates, respectively, their magmas, and especially the less evolved basic varieties, should show considerable similarities. The conventional multielement normalized diagrams indicate more complex petrogenetic processes for the MVB than the CAVA. Forty-five statistically coherent tectonomagmatic discrimination diagrams were used to infer the tectonic setting of the controversial geological subprovince of the eastern part of the MVB (E-MVB). Basic rocks from the E-MVB indicated a continental rift setting, whereas the intermediate …
Magnetomineralogical Changes Along The Kohistan-Karakoram Collision Zone Innorth Pakistan: Implications For Variable Thermochemical Activities, Haider Zaman, Abdullah O. Bamousa
Magnetomineralogical Changes Along The Kohistan-Karakoram Collision Zone Innorth Pakistan: Implications For Variable Thermochemical Activities, Haider Zaman, Abdullah O. Bamousa
Turkish Journal of Earth Sciences
To identify remanence-carrying magnetic minerals and document their thermochemical behavior, detailed rock magnetic investigations were conducted on Cretaceous-Tertiary rocks collected from northwestern and northeastern Kohistan, northern Pakistan. Rock magnetic results from each area are clearly differentiated on the basis of site location. Detrital hematite is identified as a main magnetic carrier in red beds of northwestern Kohistan located at some distance from the Northern Suture Zone with subsidiary pigmentary hematite and altered magnetite. In contrast, the magnetic mineralogy of purple-colored rocks adjacent to the Northern Suture Zone is shared by unstable secondary pyrrhotite, magnetite, and hematite. The magnetic mineralogy of …
Clay Mineralogy, Chemistry, And Diagenesis Of Late Devonian K-Bentonite Occurrences In Northwestern Turkey, Asuman Günal Türkmenoğlu, Ömer Bozkaya, Mehmet Cemal Göncüoğlu, Özge Ünlüce, İsmai̇l Ömer Yilmaz, Cengi̇z Okuyucu
Clay Mineralogy, Chemistry, And Diagenesis Of Late Devonian K-Bentonite Occurrences In Northwestern Turkey, Asuman Günal Türkmenoğlu, Ömer Bozkaya, Mehmet Cemal Göncüoğlu, Özge Ünlüce, İsmai̇l Ömer Yilmaz, Cengi̇z Okuyucu
Turkish Journal of Earth Sciences
Thin beds of tephra (K-bentonites) formed by the diagenesis of volcanic ash are exposed within the limestone-dolomitic limestone successions of the Yılanlı formation at Zonguldak and Bartın in northwestern Turkey. They were deposited on the Middle Devonian-Lower Carboniferous shallow carbonate platform of the Zonguldak terrane. In this study, K-bentonite samples collected from Gavurpınarı and Yılanlı Burnu limestone quarries are investigated in order to reveal their mineralogical and geochemical characteristics and diagenetic evolution. Illite is the major clay mineral in the studied K-bentonites. Additionally, kaolinite and mixed-layer illite-smectite are identified in some samples. The nonclay minerals calcite, dolomite, quartz, gypsum, feldspar, …