Bulletin of the Mineral Research and Exploration (BMRE)
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A new look at the origin of N-S trending young basins of western Anatolia
No full textIn the western Anatolia, the tectonic regime transitioned from crustal shortening to extension during Late Cenozoic time and evidence of this event was imprinted on basement lithologies and N-S and E-W oriented two distinct basin sub-types. Here, we examined the exhumation mechanism of the Menderes massif that forms the basement of these basins from a different perspective. The N-S oriented basins overlying different basement rock types were re-evaluated based on new evidence that has potential to put new constrains for interpreting the tectonic evolution of the area. Unroofing of the Menderes Massif must have developed due to compressional core complex. Per the model generated from our observations, we propose that the western Anatolia underwent a N-S contraction during the Early-Middle Miocene time. In this period from Marmara Sea at north to Mediterranean Sea at south, numerous basins, as in Gördes and Demirci, were bound by N-S oriented oblique faults. Evidence of contraction in the region during Early Middle Miocene time is understood by N-S oriented obique, strike-slip faults, folds, and reverse faults. Starting from the Plio-Quaternary time, the contractional regime was shifted to extension and ensuing E-W oriented grabens were formed in Gediz, Büyük Menderes, and Gökova. The structural deformation associated with these E-W oriented grabens are normal faults and related open folds. Geological evidence of multigeneration extension is recognized in the basins and basin-filling deposits throughout the Neogene to Quaternary time
Impact of thermal water on environment: case study of Mila and Guelma region, Algeria
No full textA hydrochemical characterization of the waters of the study region (North-East Algeria) was carried out following samples taken at 36 thermal springs and their effluents during May 2022. The analysis of the waters allowed to establish the chemical facies and their classification according to the Stuyfzand’s method and to deduce the aptitude of these waters for irrigation and the risks of salinity. The results revealed physico-chemical characteristics, relatively, variable. Q-mode cluster analysis was applied to the thermal water, generated four (4) groups clusters. Group1 represent a group of waters with low salinity dominated by Na-HCO3; Stuyfzand’s classification indicated that the waters are fresh-brackish with moderate to moderately high alkalinity. Taking into account the classification of Richards; we were able to identify the presence of the C3S1 class for the majority of the stations. The C3S1 class designates waters that can be used without any particular control for the irrigation of crops that are moderately tolerant to salts. These waters have average EC values of 3,616.3 μS/cm allowing their use in a less restrictive way for irrigation. Potential environmental effluents from the thermal spas could pollute both irrigation and drinking water, which represents a danger to the health of the region’s inhabitants
Importance of reinjection in sustainability of geothermal resources and reinjection well locations in Türkiye
No full textSustainability of geothermal energy is related with the type of geothermal resources (natural springs, well), usage situations (thermal, residential-greenhouse heating, energy, etc.), amount of use (optimal flow, appropriate pressure-temperature changes), conservation of resources, and is mostly achieved by reinjection of the geothermal fluid returning from usage. It is important to take measures to prevent adverse changes in temperature and pressure conditions in the reservoir to properly remove the fluid returning from use in geothermal areas from the environment and recharge the reservoir. Reinjection should be carried out under appropriate conditions for the protection of resources. In the operation of geothermal resources, reinjection/discharge conditions and obligations are also specified in the provisions of the Law No. 5686 and the implementing regulation. Various studies within the scope of exploration activities in geothermal fields, determining the productionreinjection areas and determination the location of the reinjection wells in conditions that will not adversely affect the production pressure-temperature conditions are of great importance for the sustainability of the geothermal reservoir
First Mammuthus (Elephantidae) findings from Samsun district (Türkiye)
No full textLocated between Africa, Asia and Europe, Anatolia is a crossroads for the migration of many mammals such as elephantids. For this reason, important fossils belonging to different species of elephantids were found from various localities. In this study, mammoth molars found in Samsun- Ladik were examined. As a result of the examination, M. meridionalis and M. trogontherii were identified for the first time from this region. Although the number of fossils examined is very small, the results obtained are very important as Mammuthus was identified for the first time from Samsun. When considered together with the Mammuthus species identified from Anatolia so far, the results obtained from Samsun will provide information about the distribution of the Mammuthus genus in Anatolia and the changes it has undergone
Evaluation of recent earthquake activity along the Ganos Fault: MONGAN network test analysis
No full textThe Monitoring of the Ganos Fault data presents significant opportunities and challenges for earthquake detection, location and magnitude calculations, source mechanism solutions, and discovery of fault zone waves. This study indicates mostly of preliminary data analysis and seismological evaluations. While narrow distance aperture installation has an opportunity to detect microearthquakes, it also causes significant difficulties in determining the source parameters of micro-earthquakes. Extracting microearthquakes from continuous data shows that special strategies need to be used. MONGAN data revealed the presence of many earthquakes with magnitude M\u3c1.0 in the study region. These earthquakes are mostly out of network earthquakes and it is very difficult to obtain reliable solutions due to the insufficient azimuthal distribution of the stations. It is obvious that different network techniques and wave particle motion analyzes are contributed to the location and source parameters. Although the fault zone structure consists of two different lithologies that make significant differences in seismic wave phase arrival times and wave amplitudes, we observe fault zone head waves on both sides along the Ganos fault. Moment tensor analyzes depict that reliable source mechanism solutions can be obtained using a small number of station records
Determination of the coal-bearing zones and the alteration zones containing uranium ore by using two dimensional (2D) seismic reflection method in Thrace Basin
No full textIt is aimed to reveal the basement topography, the coal-bearing levels, the alteration zones containing uranium ore, and the tectonic structure prevailing by using two dimensional (2D) seismic reflection method in the Thrace Paleogene-Neogene Basin. In this context, seismic data collected on the six profiles were interpreted by correlating with the data of 97 wells. In the seismic lines, respectively, the metamorphic basement-Eocene boundary, the top of the coal-bearing zone and the boundary of the Danişmen-Ergene formations were confirmed by using the borehole data. By evaluating seismic data, the coal propagation is modeled with three dimensional (3D) figures. Moreover, coal accumulation starts from the southwest of the field and continues towards the northeast, and it is supported by the results obtained from the borehole data. The presence of uranium ore in some of the alteration zones and borehole data indicated that all alteration zones determined should be inspected for uranium ore. In addition to normal and reverse faults, positive and negative flower structures formed in the strike-slip fault zones were determined, and lignite deposits were cut in the flank of these structures. Finally, it is recommended to carry out seismic studies before drilling, to investigate potential coal and uranium areas and to plan more seismic lines
Noise attenuation of a 3D marine seismic reflection dataset - a case study in the Southwest Black Sea region
No full textNoises in marine seismic data are one of the biggest obstacles in seismic imaging. The most significant step in seismic data processing is the removal of seismic noise, which can be classified as instrument and background noise. Noise attenuation usually results in improved seismic interpretation by increasing the signal-to-noise ratio. In this study, we will focus on attenuating these seismic noises with several data processing techniques. A number of denoising examples describing swell, strumming/tugging, and cavitation, which are background-type noises, and streamer-mounted device noise (Nautilus), which is an instrument-type noise, were illustrated by analysing a marine 3D seismic dataset recorded by Oruc Reis Research Vessel in Black Sea project of MTA (Mineral Research and Exploration). This study was achieved by implementing an f-x prediction filter (SPARC, DENOISE3D) and f-k filter (DWATT) in the t-x domain, and radon filter (RADATT) in Tau-P domain by the use of Geovation 2.0 software
Caves in clastic rocks (Muğla, SW Türkiye)
No full textCaves evolution is controlled by lithological properties, discontinuities, water, climate, and physicomechanical properties of soluble rocks, vegetation and human impact. This study investigates the cave formation in Upper Miocene-Pliocene clastic rock in Menteşe town of Muğla. The lithology, physico-mechanical properties and hydrogeologic factors of host rocks and morphology of the caves in Asar Hill and Damlam Stream valley were examined. The caves are 1.47-9.71 m long, 2.24-19.36 m wide and 1.38-27 m high. Four joint sets and bedding planes affect the clastics in the Asar Hill area. Mudstones (low plasticity clay, sandy clay) are in soft-very soft rock, while conglomerate is in moderate-hard rock class. The mudstone removal has started the formation of the caves. The vegetation roots act as groundwater circulation paths in the Damlam Stream area. Water has eroded mudstone and muddy matrix of conglomerate following cracks and led to the formation of the caves. Water infiltration may have led to stalactite, flowstone and travertine formation in Damlam Stream caves. Possible cave collapse could threaten life and property in the Asar Hill area, and may cause the destruction of internal structures of the caves in the Damlam Stream. Thus, precautionary measures such as continuous monitoring and protection must be taken in both cave areas
Supplemental skeleton revision of Pseudorbitoididae M.G. Rutten, 1935 from mainly Tethyan and partly American provinces
No full textThe nine genera here described from the Tethyan and four genera from the American and Caribbean provinces have previously been placed within different families of Foraminifera by various authors, namely, Arnaudiella DOUVILLÉ, Sirtina BRÖNNIMANN and WIRZ, Vanderbeekia BRÖNNIMANN and WIRZ, Helicorbitoides MacGILLAVRY, Dizerina MERİÇ, Sirelella ÖZGENERDEM and Cideina SİREL were shown in Lepidorbitoitidae VAUGHAN; Postorbitokathina SİREL and Orbitokathina HOTTINGER in Rotaliidae EHRENBERG; Helicolepidina TOBLER, Helicosteginopsis CAUDRI, Eulinderina BARKER and GRIMSDALE and Helicostegina BARKER and GRIMSDALE in Lepidocyclinidae SCHEFFEN, in spite of the fact that all of them have characteristics of both rotaliid early and orbitoidal adult stages. Thus the growth stages such as rotaloid early and orbitoidal adult stages of the aforementioned general correspond with the known family Pseudorbitoididae RUTTEN and its type genus Pseudorbitoides DOUVILLÉ. Therefore the thirteen genera found in great abundance in the Tethyan, American and Caribbean provinces have been transferred to Pseudorbitoididae RUTTEN
Stratigraphy of the metamorphic rocks of Niğde Massif and new evidence of Triassic rifting of the Inner Tauride Ocean (Central Anatolia, Türkiye)
No full textMetamorphites of Niğde Massif, which form the basis of the study area covering the Niğde vicinity in Central Anatolia, are composed of Late Devonian Gümüşler, Carboniferous-early Permian Kaleboynu late Permian Kızıldağ formation and unconformable Triassic-Late Cretaceous cover units from bottom to the top, which are separated from each other with unconformities. The Triassic succession (Söğütlüdere formation) of phyllite-marble-schist alternations with common amphibolite levels is first distinguished in this study, unconformably overlies the Paleozoic succession. Thick homogeneous marbles of Jurassic-Cretaceous period, is defined by quartzite at the bottom representing the unconformity at the base, is defined as the Kırtepe formation. The succession probably ends with the Late Cretaceous metaflysch (Kırkpınar formation) constituting metaophiolite blocks with unconformable contact relationships. Amphibolite sample of the Söğütlüdere formation gives 239 Ma (Middle Triassic) age, which is interpreted as the crystallization age of the primary basic magmatism. The youngest detrital zircon ages (223-224 Ma) obtained from the metaclastics of the same formation shows that the primary deposition age of the formation is probably Late Triassic, which is consistent with this data. Geochemical data indicate an extensional environment of the alkaline composition and anorogenic originated basic volcanism developed on the continental crust. When these results evaluated together with the regional data, the metabasites of the Söğütlüdere formation can be interpreted as the first phase products of rifting, which commenced with the rifting process of the Tauride-Anatolide Platform in the Triassic period and resulted in the opening of the Inner Tauride Ocean and the break off the Kırşehir Block