25 results on '"Ozkul, M"'
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2. Effects of epoxy, hardener, and diluent types on the hardened state properties of epoxy mortars
- Author
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Ozeren Ozgul, Eren and Ozkul, M. Hulusi
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- 2018
- Full Text
- View/download PDF
Catalog
3. The fresh properties of nano silica incorporating polymer-modified cement pastes
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Zabihi, Niloufar and Hulusi Ozkul, M.
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- 2018
- Full Text
- View/download PDF
4. Effects of epoxy, hardener, and diluent types on the workability of epoxy mixtures
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Ozeren Ozgul, Eren and Ozkul, M. Hulusi
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- 2018
- Full Text
- View/download PDF
5. The effect of cement type on long-term transport properties of self-compacting concretes
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Dogan, U. Anil and Ozkul, M. Hulusi
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- 2015
- Full Text
- View/download PDF
6. Effects of epoxy, hardener, and diluent types on the hardened state properties of epoxy mortars
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Ozgul, Eren Ozeren and Ozkul, M. Hulusi
- Subjects
Concretes -- Mechanical properties -- Chemical properties -- Analysis ,Mortar -- Mechanical properties -- Chemical properties -- Analysis ,Business ,Construction and materials industries - Abstract
ABSTRACT Three epoxy resins and three types of glycidylether-based reactive diluents were used together in epoxy mortars. Six different amine-based hardeners, four aliphatic and two cycloaliphatic, were used in the [...] more...
- Published
- 2018
7. Social Transformation and Migration: National and Local Experiences in South Korea, Turkey, Mexico and Australia
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S. Castles, D. Ozkul, M. Cubas, S. Castles, D. Ozkul, M. Cubas
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- 2015
8. U/TH DATING AND OPEN SYSTEM BEHAVIOR: IMPLICATIONS FOR TRAVERTINES BASED
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Claes, H, Torok, A, Soete, J, Mohammadi, Z, Vassilieva, E, Hamaekers, H, Marques Erthal, M, Aratman, C, Cheng, H, Edwards, RL, Shen, CC, Ozkul, M, Kele, S, Mindszenty, A, and Swennen, R
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U/Th dating ,travertine ,open system ,recrystallisation ,diagenesis - Abstract
Reliable dating is essential in order to put palaeoclimatological, palaeoenvironmental and archeological information from continental carbonates in the correct time frame. This study evaluates U/Th dating of travertines based on two case studies, i.e., in the Ballik (Denizli, SW Turkey) and Sutto (N Hungary) areas. Previous petrographic, mineralogical and elemental characterization of the travertines enabled sampling of, purely calcitic, micrite or spar dominant, zones that are non-, or solely weak, cathodoluminescent. Despite adapted sampling and detrital thorium corrections, U/Th ages of the Ballik and the Sato travertines are inconsistent with their stratigraphic position. Based on the observation of wavy extinction affecting micritic fabrics and ghost structures, the studied travertines behaved as an open system for uranium after deposition through recrystallisation. Their U/Th ages, consequently, can only be considered as minimum ages. The Ballik travertines precipitated earlier than 0.55-1.31 Ma ago, when late-stage cementation along fractures and in cavities took place, and form the oldest travertines deposited in the Denizli basin. The formation of the Sato travertine area started at the earliest around 2.5 Ma with precipitation of the Cukor travertine. With some short interruptions, active travertine formation in the area took place maximally until 120 ka. The decreasing ages of the Sutto travertines towards the Danube, prove the complex nature of travertines both during deposition as well as during diagenesis, which leads to anomalies with regard to the law of superposition. The diagenetic susceptibility of continental carbonate deposits poses problems in terms of accurate and precise dating. U/Th dating of the intrinsically heterogeneous fabrics of travertines and tufa, as presently applied, should be ceased. Travertines and tufa up to similar to 100 ka might be the exception due to the limited extent of recrystallisation. Sparite cements and veins can be dated more accurately but, even with multiple samples from the same study site and inclusion of coeval samples, give only minimum ages for the whole deposits. To better constrain the time frame of the whole bodies, results from independent dating methods and from the surrounding deposits are necessary. In addition, it is important to keep in mind that the open-system behavior of continental carbonates has implications for diagenetic, palaeoenvironmental and palaeoclimatological studies based on geochemical proxies. C1 [Claes, Hannes; Torok, Agnes; Soete, Jeroen; Mohammadi, Zahra; Vassilieva, Elvira; Hamaekers, Helen; Marques Erthal, Marcelle; Aratman, Cihan; Swennen, Rudy] Katholieke Univ Leuven, Dept Earth & Environm Sci, Geodynam & Geofluids Res Grp, BE-3001 Heverlee, Belgium. [Claes, Hannes] Rhein Westfal TH Aachen, Clay & Interface Mineral CIM, Bunsenstr 8, DE-52072 Aachen, Germany. [Torok, Agnes; Mindszenty, Andrea] Eotvos Lorand Univ, Inst Geog & Earth Sci, Dept Phys & Appl Geol, Pazmany P Setany 1-c, HU-1117 Budapest, Hungary. [Soete, Jeroen] Katholieke Univ Leuven, Dept Mat Engn, Nondestruct Testing Res Grp, BE-3001 Heverlee, Belgium. [Hamaekers, Helen] SCR Sibelco Nv, Dept Geol, De Zate 1, BE-2480 Dessel, Belgium. [Marques Erthal, Marcelle] Petrobras Res Ctr, Av Horacio de Macedo Cidade Univ 950, BR-21941915 Rio De Janeiro, RJ, Brazil. [Aratman, Cihan; Ozkul, Mehmet] Pamukkale Univ, Dept Geol Engn, Kinikli Campus, TR-20070 Denizli, Turkey. [Cheng, Hai; Edwards, R. Lawrence] Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA. [Cheng, Hai] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China. [Shen, Chuan-Chou] Natl Taiwan Univ, Dept Geosci, High Precis Mass Spectrometry & Environm Change L, Taipei 10617, Taiwan. [Shen, Chuan-Chou] Natl Taiwan Univ, Res Ctr Future Earth, Taipei 10617, Taiwan. [Shen, Chuan-Chou] Natl Taiwan Univ, Global Change Res Ctr, Taipei 10617, Taiwan. [Kele, Sandor] Hungarian Acad Sci, Inst Geol & Geochem Res, Res Ctr Astron & Earth Sci, Budaorsi Ut 45, HU-1112 Budapest, Hungary. more...
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- 2020
9. last interglacial in southern Turkey
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Rowe, PJ, Wickens, LB, Sahy, D, Marca, AD, Peckover, E, Noble, S, Ozkul, M, Baykara, MO, Millar, IL, and Andrews, JE
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Mediterranean ,Stalagmite Termination II ,Stable isotopes ,Climate anomaly ,Aragonite - Abstract
A stalagmite from Dim Cave in southern Turkey contains a climate record documenting rapid and significant changes in amounts of precipitation between similar to 132 ka and similar to 128 ka, during the penultimate glacial - interglacial transition. Some U-Th dates have been compromised by carbonate dissolution but rigorous selection and tuning to delta O-18 records from other speleothems has generated a robust age model. Growth rate was initially very slow but a rapid increase at similar to 129 ka was accompanied by strong negative trends in delta O-18 and delta C-13, a combination implying the onset of much wetter conditions. Isotopic values at similar to 129 ka suggest that groundwater recharge rates and biogenic activity in the soil zone exceeded those of the early Holocene. A significant isotopic enrichment event at similar to 128 ka, during which there was alternating aragonite and calcite deposition, documents a strong drying event with a duration of similar to 200 years. A concurrent decrease in Sr-87/Sr-86 ratios indicates increased groundwater residence times and the cumulative evidence suggests amounts of rainfall fell from well above to slightly below present-day levels. Similar delta O-18 enrichment events are present in coeval speleothem records from southwest France and the Northern Alps, and these, together with pollen evidence from Italy, Greece and the Iberian margin of drier conditions at this time, imply that a climate anomaly extended across the northern Mediterranean borderlands. The timing, duration and structure of this episode are consistent with marine evidence of strong North Atlantic cooling early in the last interglacial and there is a resemblance to the Holocene 8.2 ka event recorded globally in many proxy-climate archives. C1 [Rowe, P. J.; Wickens, L. B.; Marca, A. D.; Peckover, E.; Andrews, J. E.] Univ East Anglia, Sch Environm Sci, Norwich NR4 TJ, Norfolk, England. [Sahy, D.; Noble, S.; Millar, I. L.] British Geol Survey, NERC Isotope Geosci Lab, Geochronol & Tracers Facil, Nottingham NG12 5GG, England. [Ozkul, M.; Baykara, M. O.] Univ Pamukkale, Dept Geol, TR-20070 Denizli, Turkey. more...
- Published
- 2020
10. THE GIANT QUATERNARY BALLIK TRAVERTINE SYSTEM IN THE DENIZLI BASIN (SW
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Aratman, C, Ozkul, M, Swennen, R, Hollis, C, Marques Erthal, M, Claes, H, and Mohammadi, Z
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travertine ,depositional environment ,Dunham lithofacies ,fabric ,Turkey - Abstract
This research forms the basis for the applicability of the Dunham (1962) classification of carbonated rock lithofacies to the analysis of the giant Ballik travertine architecture, while reconstructing lateral and vertical environmental changes. This study provides an analogue for spring-related deposits encountered offshore Brazil and Angola by linking macroscopically travertine lithofacies distribution to depositional environments. The analysis is based on rock-building constituents such as gastropods, charophytes, intraclasts, phytoclasts, coated grains, dendrites etc., forming micro-sedimentary fabrics with different structures such as packstone, grainstone, wackestone and boundstone, these latter closely associated with crust of dendrites and phytoherm of reeds and bryophytes. Our findings indicate that the Ballik travertine area consists of a "Lower" and an "Upper Domain" reflecting different depositional environments. More specifically, the "Lower Domain" consists from west to east of a laterally complex amalgamation of extended pool, marsh pool and flood plain environments that formed from a mixture of spring and ground waters. The extended pond environment characterised by a boundstone facies of stromatolites in the west evolves eastward into a marsh pool and flood plain. This is because CO2 degassing and water temperature decreased as the water depth of the Lower Domain reduced towards the east. The marsh pool environment includes packstone to grainstone lithofacies and abundant wackestone lithofacies made of phytoclasts, whose crusts exhibit pustular fabrics. Moreover, the flood plains along with the marsh pool consist dominantly of packstone to grainstone lithofacies with many gastropods and intraclasts, interfingered with wackestone lithofacies made of phytoclasts. Irregular clotted fabrics, along with coated grains with radial fibres, high lime mud content with bioturbation are also present. The "Upper Domain" displays a laterally less heterogeneous palaeoenvironmental distribution with flooded slope and flood plain deposits. The eastern part of the "Upper Domain" is characterized by a systematic alternation of these environments, with intercalations of wackstone lithofacies made of phytoclasts, packstone to grainstone lithofacies made of intraclasts and lime muds as well as coated grains. The flood plain has coated grains having peloidal nuclei and coatings of sparry laminations and clotted fabric of peloids representing intraclasts, whereas, the flooded slope possesses coated grains with coatings of dendrites and nuclei of peloids, boundstone of stromatolites which have flat-laminated and columnar-laminated fabrics indicating a laminar discharge away from the spring(s). Alluvial fan and palustrine deposits with abundant bryophytes and reeds frequently interfinger with marsh pool environment in the "Lower Domain", and with the flood plain and flooded slope environments in the "Upper Domain". The results illustrate well how environmental changes identified in the two different domains have induced heterogeneity in reservoir-based depositional architecture. C1 [Aratman, Cihan; Swennen, Rudy; Mohammadi, Zahra] Katholieke Univ Leuven, Geodynam & Geofluids Res Grp, Dept Earth & Environm Sci, Celestijnenlaan 200E, BE-3001 Leuven, Belgium. [Aratman, Cihan; Ozkul, Mehmet] Pamukkale Univ, Dept Geol Engn, Kinikli Campus, TR-20070 Denizli, Turkey. [Marques Erthal, Marcelle] Petrobras Res Ctr, Av Horacio de Macedo Cidade Univ 950, BR-21941915 Rio De Janeiro, RJ, Brazil. [Hollis, Cathy] Univ Manchester, Dept Earth & Environm Sci, Williamson Bldg 2-69,Oxford Rd, Manchester M13 9PL, Lancs, England. [Claes, Hannes] Rhein Westfal TH Aachen, Clay & Interface Mineral, Energy & Mineral Resources, 18 Bunsenstr 8, DE-52072 Aachen, Germany. more...
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- 2020
11. Pleistocene-Holocene tectonic reconstruction of the Ballik travertine
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Van Noten, K, Topal, S, Baykara, MO, Ozkul, M, Claes, H, Aratman, C, and Swennen, R
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reactivation ,Paleostress analysis ,Travertine facies development ,Fault mapping ,Extension ,Transtension ,Transfer zone ,Strike-slip ,NIZLI ,WESTERN TURKEY ,EXTENSIONAL TECTONICS ,CONTINENTAL EXTENSION - Abstract
Travertine geobodies have been identified as potential reservoir analogues to carbonate build-ups in pre-salt hydrocarbon systems. To investigate travertine geobody deformation, faults were mapped in 35 travertine quarries that excavate the Ballik travertine, i.e. a c. 12.5 km(2) large travertine geobody that precipitated at the intersection of the NE margin of the Denizli Basin and neighbouring Baklan Graben (SW Turkey). This travertine precipitated from cooling carbonate-saturated thermal spring waters that resurfaced along the margin fracture/fault network and through Neogene unconsolidated underlying sediments. From the Denizli basin floor to the uplifted graben shoulders, fault orientation is dominantly WNW-ESE oriented with major basin faults showing a left-stepping trend. Along the upper Denizli margin, travertine is only deformed by extensional normal faults. Along the lower margin, travertine starts with a subhorizontal facies but evolves to a travertine facies formed by a sloping topography with a domal architecture. Paleostress inversion of fault-slip data reveals that an Early Pleistocene NNE-SSW extensional-transtensional phase initiated the WNW-ESE oriented, graben-facing normal fault network. In the Middle Pleistocene, the Ballik fault network was left-lateral strike-slip reactivated because it acted as a transfer zone between the NW-SE extending neighbouring Baklan Basin and NW-SE extension along NE-SW oriented margin faults of the DGHS. In this stress configuration, travertine precipitated along the SW margin fault of the Baklan Graben. After strike-slip reactivation, a Late Pleistocene-to-current NNE-SSW extensional stress regime reinstalled during which margin faults widened and active travertine precipitation moved to more central parts of the DGHS. As different tectonic regimes affect graben intersections, reservoir analogues can have a complex deformation history driven by fault reactivation and recurrent stress permutations. This study concludes that large travertine geobodies can form at graben intersections because of their susceptibility to enhanced fluid flow through the complex fault-fracture network. C1 [Van Noten, Koen] Royal Observ Belgium, Seismol Gravimetry, Ringlaan 3, B-1180 Brussels, Belgium. [Van Noten, Koen] Royal Belgian Inst Nat Sci, Geol Survey Belgium, Jennerstr 13, B-1000 Brussels, Belgium. [Topal, Savas; Baykara, M. Oruc; Ozkul, Mehmet; Aratman, Cihan] Pamukkale Univ, Dept Geol Engn, Kinikli Campus, TR-20070 Denizli, Turkey. [Claes, Hannes; Aratman, Cihan; Swennen, Rudy] Katholieke Univ Leuven, Dept Earth & Environm Sci, Geodynam & Geofluids Res Grp, Celestijnenlaan 200E, B-3001 Leuven, Belgium. [Claes, Hannes] Rhein Westfal TH Aachen, Clay & Interface Mineral Energy & Mineral Resourc, Bunsenstr 8, D-52072 Aachen, Germany. more...
- Published
- 2019
12. travertine: Importance of digestion method and statistics
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Claes, H, Huysmans, M, Soete, J, Dirix, K, Vassilieva, E, Erthal, MM, Vandewijngaerde, W, Hamaekers, H, Aratman, C, Ozkul, M, and Swennen, R
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trace elements ,Stable isotopes ,Travertines ,Geochemistry ,Statistics ,Multivariate analyses ,Major and - Abstract
Elemental data from travertines are a treasure of depositional and diagenetic information. However, correct interpretation requires proper data acquisition and treatment. This study shows how results from elemental analyses complement sedimentological and other geochemical, i.e. isotopic, data and thereby contribute to our understanding of fossil travertines. Multivariate statistical element analyses, after multiple travertine digestion methods, demonstrate the link between elements, their mineralogical phases, and ultimately their origin. This study reveals that carbonate-phase related elements in travertines (Sr, S, Ba, Mg and Na) originate dominantly from the fluid source rocks. In combination with the delta O-18 and delta C-13 signatures, they are thus key geochemical variables for comparison of different travertine geobodies. Geochemical data analysis (elemental concentrations and isotope signatures), as illustrated here for the Turkish Battik travertines, supports interpretation with regard to fluid source rock, distance from the vent and relative intensity of processes like evaporation and degassing. For fossil travertines, geochemical data can thus provide crucial insights for understanding the hydrologic system. In particular when information is restricted to borehole data, like in subsurface reservoirs, their application could be decisive. (C) 2019 Elsevier B.V. All rights reserved. C1 [Claes, Hannes; Soete, Jeroen; Dirix, Katrijn; Vassilieva, Elvira; Erthal, Marcelle Marques; Vandewijngaerde, Wim; Hamaekers, Helen; Swennen, Rudy] Katholieke Univ Leuven, Geodynam & Geofluids Res Grp, Dept Earth & Environm Sci, Celestijnenlaan 200E, B-3001 Leuven, Belgium. [Claes, Hannes] Rhein Westfal TH Aachen, CIM, Bunsenstr 8, D-52072 Aachen, Germany. [Huysmans, Marijke] Vrije Univ Brussel, Hydrol & Hydraul Engn, Pl Laan 2, B-1050 Brussels, Belgium. [Dirix, Katrijn] Flemish Inst Technol Res, VITO, Boeretang 200, B-2400 Mol, Belgium. [Erthal, Marcelle Marques] Petrobras Res Ctr, Av Horacio de Macedo Cidade Univ 950, BR-21941915 Rio De Janeiro, RJ, Brazil. [Hamaekers, Helen] SCR Sibelco Nv, Dept Geol, Zate 1, BE-2480 Dessel, Belgium. [Aratman, Cihan; Ozkul, Mehmet] Pamukkale Univ, Dept Geol Engn, Kinikh Campus, TR-20070 Denizli, Turkey. more...
- Published
- 2019
13. geothermal spring carbonate system, Obruktepe, Turkey
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Lopez, B, Camoin, G, Ozkul, M, Swennen, R, and Virgone, A
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Continental carbonates ,Denizli Basin ,Quaternary ,stable isotope ,travertine ,tufa ,Turkey - Abstract
The recent discoveries of deeply buried Cretaceous reservoir bodies in the Atlantic Ocean revealed that relationships between the distribution of spring carbonate deposits and faults are poorly understood. The well-exposed Quaternary deposits at Obruktepe (Denizli Basin, Turkey) provide an opportunity to reconstruct the three-dimensional sedimentary architecture of such a system. Integration of sedimentological, lithofacies and geochemical analyses reveals complexity in the lateral relationships between sedimentary environments, faults and geothermal spring carbonates. Five environmental systems are distinguished based on the lithofacies analysis: (i) vent; (ii) smooth slope; (iii) travertine-terrace; (iv) tufa-barrage; and (v) flood systems. Encrusting, baffling and settling sedimentary processes are reflected in data acquired at several scales, from lithofacies observations to the morphology and arrangement of geobodies, together with microfabrics and stable carbon and oxygen isotope data. Mean values of +4.9 parts per thousand delta C-13 and -8.74 parts per thousand delta O-18 Vienna PeeDee Belemnite reflect geothermal circulation of springwaters. The environmental distribution and lithofacies indicate a lateral continuum between travertine and tufa deposits within this hot spring system. This finding supports two depositional models in which water flow variation is the main control on both CaCO3 precipitation and the resulting formation of travertine and tufa. The proposed models address the factors responsible for the development of these complex mound-shaped carbonate spring deposits, and how they are related to fluid circulation at depth and in association with faults. more...
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- 2017
14. Comparative study of the Pleistocene Cakmak quarry (Denizli Basin
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De Boever, E, Foubert, A, Lopez, B, Swennen, R, Jaworowski, C, Ozkul, M, and Virgone, A
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Carbonate spring ,Mammoth hot springs ,Denizli basin ,Facies model ,Travertine architecture - Abstract
This study compares and contrasts the travertine depositional facies of two of the largest sites of travertine formation, located in very different geological contexts, i.e. the modern Mammoth Hot Spring (MHS) system in the active volcanic complex of Yellowstone National Park (USA) and the Pleistocene Cakmak quarry, a well-exposed example of the Ballik travertines in the extensional Denizli Basin (Turkey). New, 2D to 3D facies maps of both travertine systems, combined with microscopy, assist in proposing an integrated spring depositional model, based on the existing MHS facies model, understanding general controls on meter to kilometer scale travertine deposit architecture and its preservation, and provide quantitative estimates of facies spatial coverage and slope using GIS. The comparison resulted in the distinction of eight facies, grouped in five downstream facies zones from Vent to Distal Slope. Notwithstanding the different geological context of both travertine systems, observations show that several of the facies are strikingly comparable (draping Apron and Channel Facies, top-slope Pond Facies, crystalline Proximal Slope Facies and Distal Slope Facies), whereas other facies do not have a precise, exposed equivalent (Vent Facies, pavement Apron and Channel Facies, extended Pond facies and phyto Proximal Slope Facies). Combining observations of active springs at MHS with the Cakmak vertical travertine quarry exposures demonstrates that lateral and vertical facies transitions are a sensitive record of changes in the spring dynamics (flow intensity and paths) that become well-preserved in the geological record, and can be recognized as prograding, aggrading, retrograding trends or erosive surfaces, traceable over tens to hundreds of meters. Quantification of facies specific coverage at MHS shows that Proximal and Distal Slope Facies deposits cover as much as similar to 90% of the total mapped surface area. In addition, only similar to 7% of the surface is found to be marked by a waterfilm related to an active flowing spring. Slope statistics reveal that strong slope breaks can often be related to transgressive Apron and Channel Facies belts and that variable, but steep slopes (up to 40 degrees) are dominated by Proximal Slope Facies, in agreement with the Cakmak exposures. Integrating travertine facies and architecture of deposits formed in distinct geological contexts can improve the prediction of general spring facies distributions and controls in other, modern and ancient, subsurface travertine systems. (C) 2016 Elsevier Ltd and INQUA. All rights reserved. more...
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- 2017
15. from the Ballik-Belevi area (Denizli, SW Turkey)
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Claes, H, Erthal, MM, Soete, J, Ozkul, M, and Swennen, R
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classification ,Shrub ,Travertine ,Pre-salt analogue ,Microbialites ,Pore-type ,POSITS ,ISLAND ,DIAGENESIS ,CARBONATES ,DENDRITES - Abstract
Petrographical and petrophysical properties of the Turkish Ballik-Belevi travertine shrubs demonstrate the necessity of reservoir oriented classifications for shrub-related lithotypes and associated pore types. The presented shrub-related lithotype classification incorporates morphology, size and fabric, which are linked to specific pore-types and sizes. The travertines show highly complex pore networks, as observed from Computed Tomography reconstructions, making them of interest for the development and optimization of pore characterization methodologies and techniques, following an upscaling approach. Porosity (3-15%) and permeability (0-505 mD) strongly vary for the Ballik-Belevi travertines. The highest porosities and permeabilities are measured for horizontal samples dominated by slightly dissolution enlarged intershrub and interdigit growth framework porosity, mostly found for dendritic shrubs. The presented shrub and pore-type classification can be applied to shrubs worldwide. Studying outcrop analogues of continental carbonates helps to better understand heterogeneities, lateral variability and properties of Pre-Salt Cretaceous continental carbonate reservoirs, offshore Brazil and Angola. (C) 2016 Elsevier Ltd and INQUA. All rights reserved. more...
- Published
- 2017
16. spring carbonate facies: Case study from the Cakmak quarry (Denizli
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De Boever, E, Foubert, A, Oligschlaeger, D, Claes, S, Soete, J, Bertier, P, Ozkul, M, Virgone, A, and Swennen, R
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Travertine Facies ,Microporosity ,NMR ,mu-CT ,pore network ,Turkey - Abstract
Carbonate spring deposits gained renewed interest as potential contributors to subsurface reservoirs and as continental archives of environmental changes. In contrast to their fabrics, petrophysical characteristics - and especially the importance of microporosity (< 1 mu m) - are less understood. This study presents the combination of advanced petrophysical and imaging techniques to investigate the pore network characteristics of three, common and widespread spring carbonate facies, as exposed in the Pleistocene Cakmak quarry (Denizli, Turkey): the extended Pond, the dipping crystalline Proximal Slope Facies and the draping Apron and Channel Facies deposits formed by encrustation of biological substrate. Integrating mercury injection capillary pressure, bulk and diffusion Nuclear Magnetic Resonance (NMR), NMR profiling and Brunauer-Emmett-Teller (BET) measurements with microscopy and micro-computer tomography (mu-CT), shows that NMR T-2 distributions systematically display a single group of micro-sized pore bodies, making up between 6 and 33% of the pore space (average NMR T-2 cut-off value: 62 ms). Micropore bodies are systematically located within cloudy crystal cores of granular and dendritic crystal textures in all facies. The investigated properties therefore do not reveal differences in micropore size or shape with respect to more or less biology-associated facies. The pore network of the travertine facies is distinctive in terms of (i) the percentage of microporosity, (ii) the connectivity of micropores with meso- to macropores, and (ii) the degree of heterogeneity at micro- and macroscale. Results show that an approach involving different NMR experiments provided the most complete view on the 3-D pore network especially when microporosity and connectivity are of interest. more...
- Published
- 2016
17. NGS and Sanger screening for BRCA1/BRCA2, CHEK2 and TP53 in Argentinian high-risk breast/ovarian cancer families and bioinformatic studies: Initial results
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Bruno, L., primary, Jablonski, P., additional, Ozkul, M., additional, Mercado, G., additional, Sendoya, J., additional, Llera, A., additional, Núñez, L., additional, Valdez, R., additional, Mansilla, D., additional, Cólica, V., additional, Kalfayan, P., additional, Ruggiero, C., additional, Reyes, M., additional, and Cerretini, R., additional more...
- Published
- 2017
- Full Text
- View/download PDF
18. Effect of Initial Water Curing on Sorptivity Properties of Ordinary Portland and Pozzolanic Cement Concretes
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Ozer, Baris, primary and Ozkul, M. Hulusi, additional
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- 2017
- Full Text
- View/download PDF
19. pore types
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Soete, J, Kleipool, LM, Claes, H, Claes, S, Hamaekers, H, Kele, S, Ozkul, M, Foubert, A, Reijmer, JJG, and Swennen, R
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Travertine ,Acoustic-wave velocity ,Pore type - Abstract
Sonic velocities of Pleistocene travertines were measured under variable confining pressures. Combined with petrographical characteristics and petrophysical data, i.e. porosity, permeability and density, it was determined that travertine porosity, pore types and cementation control compressional-wave (V-p) and shear-wave velocity (V-s). At 40 MPa confining pressures, V-p ranges between 3695 and 6097 m/s and V-s between 2037 and 3140 m/s. Velocity variations in travertines are, as with all carbonates, primarily linked to sample heterogeneity, i.e. differences in fabric, texture and porosity. They thus not necessarily emanate from changes in mineralogy or composition. Body wave velocities have a positive correlation with sample density and an inverse correlation with porosity. The travertines, sampled in extensional settings with normal faulting activity, define a specific compressional-wave velocity (y-axis) versus porosity (x-axis) equation, i.e. (log(y) = -0.0048x + 3.7844) that differs from the V-p-porosity paths defined by marine carbonates. Acoustic wave velocities are higher for travertines than for marine carbonates. Travertine precipitates form rigid rock frames, often called framestone, with large primary pores. Marine carbonates on the other hand often consist of (cemented) transported sediments, resulting in a rock frame that permits slower wave propagation when compared to the continental limestones. Acoustic velocity variations are linked to variations in pore types. Mouldic pores (macropores) show faster wave propagation than expected from their total porosities. Microporosity, interlaminar and interpeloidal porosity result in slower acoustic velocities. Framework pores and micro-moulds are associated with lowered acoustic velocities, while vug porosity is found above, on and below the general velocity-porosity trend. Not only the pore type, but also pore shapes exert control on body wave velocities. Cuboid-and rod-like pore shapes increase the velocity, while plate-and blade-like pore shapes have a negative effect on the velocity. The study demonstrates how seismic sections in travertine systems can contain seismic reflections that are not caused by non-carbonate intercalations, but relate to geobody boundaries, in which the seismic expression is function of porosity, pore types and shapes. This study provides and relates petrophysical data, i.e. porosity, permeability and acoustic velocities of travertines and is of importance for the interpretation of seismic reflection data in subsurface continental carbonate reservoirs. (C) 2014 Elsevier Ltd. All rights reserved. more...
- Published
- 2015
20. Sedimentology, three-dimensional geobody reconstruction and carbon
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Claes, H, Soete, J, Van Noten, K, El Desouky, H, Erthal, MM, Vanhaecke, F, Ozkul, M, and Swennen, R
- Subjects
3D geobody architecture ,diagenesis ,facies ,isotope geochemistry ,travertine - Abstract
The Denizli Basin in the West Anatolian Extensional Province in western Turkey is well-known for its numerous travertine occurrences. A combined sedimentological, diagenetic and geochemical investigation is executed on the Ece and Faber travertines of the Ballk area, the largest travertine site in the Denizli Basin. The first aim of this study is the reconstruction of a three-dimensional geo-model in combination with a detailed sedimentological description from fabric to lithotype, lithofacies and geobody scale, with a focus on integrating pore-typing. The second aim involves the delineation of the CO2-origin of ancient travertine precipitating waters. Peloidal, phyto and dendritic lithotypes dominate the studied travertines and honeycomb and bacteriform shapes and encrusted bacterial or fungal filaments related to their fabrics suggest a microbial influence. The environment of travertine precipitation evolved from dominantly sub-aqueous, as represented by the sub-horizontal and biostromal reed travertine facies, to dominantly sub-aerial in a thin water film, resulting in the cascade, waterfall and biohermal reed travertine facies. A general progradation of the travertine mound is indicated by the occurrence of stacked waterfall travertines. This results in sigmoidal clinoforms inside a general mound boundary configuration. Strontium and oxygen-carbon isotope signatures of the travertines point to a mixing mechanism of palaeofluids with deeply originated, heavy carbon CO2 with lighter carbon CO2 of shallow origin. These deposits can thus be considered as endogenic travertines. Carbonates of the Lycian Nappes acted as main parent carbon source rocks. The relative contribution of the lighter carbon isotopes is most likely to have originated from organic matter or soil CO2. This study provides a unique three-dimensional insight into the Ballk travertine architecture that potentially can be used as an analogue for subsurface travertine reservoirs worldwide and illustrates the importance of the combined use of C-13 and Sr-87/Sr-86 signatures in the delineation of the CO2-origin of travertine precipitating waters. more...
- Published
- 2015
21. unravelling the genesis of fossil travertine systems
- Author
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El Desouky, H, Soete, J, Claes, H, Ozkul, M, Vanhaecke, F, and Swennen, R
- Subjects
Boiling ,C-O isotopes ,Denizli Basin (Turkey) ,fluid inclusions ,hydrocarbon exploration ,Sr isotopes ,travertine - Abstract
The Denizli Basin is a fault-bounded Neogene-Quaternary depression located in the Western Anatolian Extensional Province, Western Turkey. The basin is a unique geological site with abundant active and fossil (Quaternary) travertine and tufa deposits. Fluid inclusion microthermometry and isotopic analysis were applied to study the genesis of the Ballk fossil travertine deposits, located in the south-eastern part of the basin. Microthermometry on fluid inclusions indicates that the main travertine precipitating and cementing fluids are characterized by low salinity ( more...
- Published
- 2015
22. MACRO DEFECT FREE CEMENTS: A REVIEW
- Author
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Ekincioglu, Ozgur, primary, Ozkul, M. Hulusi, additional, and Patachia, Silvia, additional
- Published
- 2016
- Full Text
- View/download PDF
23. Transcanal Tympanoplasty with Cartilage-Perichondrium Composite Graft
- Author
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Paltura, Ceki, primary, Celebi, Saban, additional, Develioglu, Omer N., additional, Chatzi, Tzemal, additional, Topak, Murat, additional, Ozkul, M. Haluk, additional, and Kulekci, Mehmet, additional
- Published
- 2015
- Full Text
- View/download PDF
24. The Effect of Nano-Silica Particles on Fresh and Hardened State Properties of Polymer Cement Mortars
- Author
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Zabihi, N., primary and Ozkul, M. Hulusi, additional
- Published
- 2015
- Full Text
- View/download PDF
25. 1415P - NGS and Sanger screening for BRCA1/BRCA2, CHEK2 and TP53 in Argentinian high-risk breast/ovarian cancer families and bioinformatic studies: Initial results
- Author
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Bruno, L., Jablonski, P., Ozkul, M., Mercado, G., Sendoya, J., Llera, A., Núñez, L., Valdez, R., Mansilla, D., Cólica, V., Kalfayan, P., Ruggiero, C., Reyes, M., and Cerretini, R.
- Published
- 2017
- Full Text
- View/download PDF
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