Bulletin of the Mineral Research and Exploration (BMRE)
Not a member yet
1932 research outputs found
Sort by
GEOLOGY AND GEOCHEMISTRY OF NODULAR-PHOSPHATE AND FAULT-CONTROLLED HYDROTHERMAL-PHOSPHATE MINERALIZATIONS IN ARIKLI AND NUSRATLI VILLAGES (AYVACIK-ÇANAKKALE, NW TURKEY)
No full textUranium bearing phosphate mineralizations in the tuffs (ignimbrites) of Middle Miocene Arıklı volcanites in the vicinity of Arıklı and Nusratlı villages, Çanakkale have been known since 1977. In the study area, two types of phosphate mineralizations are present in different parts. First type and important one is in the tectonic zones in tuffs and along the contact between tuffs and Çetmi ophiolite and along the contacts of the units of the Küçükkuyu Formation in the Muharremin Tepe, Feyzullah Tepe, Örencik Tepe, Gedikharman Tepe in north and northwest of Arıklı village. Second type is the vein type mineralizations in the tuffs in Çarşılı Tepe, east of Nusratlı village. Both types of mineralizations are hydrothermal origin. Additionally, walnut-sized syngenetic phosphate nodules are also observed in the tuffs in Çarşılı Tepe. XRD and geochemical analysis of samples obtained from mineralizations indicated that the major phosphate bearing mineral is chlorapatite and they have P2O5 contents ranging from 4.5 to 32.4%. The economic potential of the mineralization is not significant due to limited lateral and vertical continuity of the phosphate mineralization. So, in the study area, economically important phosphate deposit is not expected. DOI: 10.19111/bulletinofmre.31419
29 NOVEMBER 1795 KAHRAMANMARAŞ EARTHQUAKE, SOUTHERN TURKEY
No full textSignificant tectonic structures observed in the vicinity of Kahramanmaraş are the northern branch of the East Anatolian Fault Zone (EAFZ) (Sürgü segment, Çardak segment, Savrun segment, Çokak segment and Toprakkale segment), the southern branch of EAFZ (Gölbaşı segment and Amanos segment), Engizek Fault Zone, Kahramanmaraş Fault Zone and Narlı segment of the Dead Sea Fault Zone (DSFZ). The manuscript in which the 1795 Kahramanmaraş Earthquake has been mentioned is kept in the work of art called “Divan-ı Hasmi” in the Koyunoğlu Library of the Konya Metropolitan Municipality. From the statements in the work the intensity of the earthquake is 8,0 and due to this fact the magnitude of the earthquake was estimated as 7,0. The estimations made reinforce the probability that the earthquake occurred on Gölbaşı segment of the EAFZ
DOI: 10.19111/bulletinofmre.31421
GRAIN SIZE, TOTAL HEAVY MINERAL AND ELEMENT DISTRUBITION OF ACTUAL SEDIMENTS ON BOTTOM OF HISARÖNÜ AND DATÇA BAYS AND ITS CONTROL FACTORS
No full textThis paper explain research results for Holocene sedimentary processes and controlling factors on Datça and Hisarönü Bays located in south west Turkey. For this purpose, we collected sea bottom grab samples (upper 30 cm) from 71 stations and seismic profiles (we use only one sample explain to sedimentary process) collected in MTA-SELEN research ship on Hisarönü and Datça Bays. It is known and widely applied in seismic analysis methods and techniques are used on seismic profile which according to the continental shelf edge or threshold current -90 / -120 m water depth. At the same time, seismic profile were showed sea level changes of the Quaternary period and exhibits seismic facies parameters. According to radiocarbon dating calculations and we estimate these sediments which are 2694-14700 years of before present. Sediments grain size are 1-18% gravel, 7-85% sand, 6-69% silt and 2-30% clay size is composed of clastic material. Although silt and clay (mud) the most widely sediments are in our investigation area, we run into significant sand and gravel grain size important. We discuss regional differences grain size distribution and to be here residual (relic) sediments are in our investigation area. The total amount of heavy mineral-rich black sand is mostly below 2%, ophiolite and chromite-rich central and eastern regions is as high as 13%. Inorganic geochemistry of sediments are Mg, Cu, Ni and Fe amount is significant. Regional changing river drainage system, bay morphology, terrestrial and marine resources and outcrops also waves and currents effect not only sediment grain size distribution, but also effect the total heavy mineral content and the main elements composition
THE IMPORTANCE OF AMOUNT OF SETTLEMENT IN DETERMINING THE BEARING CAPACITY OF SOILS
No full textIn this study, it is aimed to determine safe bearing capacity of soils, which are out cropped around Tamzi and Akcakale villages located in Gumushane, providing allowable settlement conditions for an optimum foundation design. To define the geotechnical properties of soils, three trenches were dug and two seismic refraction with two Multichannel Spectral Analysis of Surface Waves (MASW) were carried out in each research area. Sieve analyses, shear box tests, triaxial compression tests were carried out on disturbed and undisturbed samples taken from the trenches. Seismic velocities of the soils are determined by seismic refraction and MASW methods. While determining the safe bearing capacity; the equations proposed by Terzaghi, Meyerhof, Kurtulus, Tezcan and Ozdemir, Turker, Keceli were used and the obtained safe bearing capacity values were compared to each other. After, the soils were modeled numerically by using finite elements method and safe bearing capacities providing allowable settlement conditions were determined. According to the results, safe bearing capacity values obtained from empirical equations are not satisfactory to have an optimum foundation design. For the optimum foundation design, safe bearing capacity should be accepted as 190 kN/m2 for clayey soil (CL) and 485 kN/m2 for the clayey sand (SC)
A COMPARATIVE ANALYSIS OF INDEX OVERLAY AND TOPSIS (BASED ON AHP WEIGHT) FOR IRON SKARN MINERAL PROSPECTIVITY MAPPING, A CASE STUDY IN SARVIAN AREA, MARKAZI PROVINCE, IRAN
No full textThe aim of this research is to compare index overlay and TOPSIS (based on AHP weight) for predictive Skarn potential map. In this paper, for Calcic Iron Skarn mineralization, criteria and subcriteria introduced and ranked for generating mineral prospectivity map. The values of final prospecting maps for Skarn deposit by index overlay and TOPSIS methods was specified by dividing the prospectivity values into 10 classes. For better comparison,values assign to classes base on their priority in mineral exploration. The comparative analyses of index overlay and TOPSIS integration methods, has been performed by selecting four GCPs for field checking. Field observation in GCP 1, 2 and 3, confirmed Iron mineralization in the contact of intrusive bodies with sedimentary units, where the contact metamorphism was obvious but there is no observable mineralization in GCP4. Although high magnetic is distinct in mentioned GCP. Based on the field checking in Sarvian area, the TOPSIS method has more accuracy compared to index overlay approach. Therefore, the TOPSIS method recommends for Calcic Iron Skarn Mineral Prospectivity Mapping in Sarvian and adjacent area. DOI: 10.19111/bulletinofmre.30520
Pb – Zn - Cd ACCUMULATOR PLANTS GROWN AROUND THE GÖRGÜ(YESİLYURT) Pb – Zn MINE, -MALATYA, TURKEY
No full textA study was carried out to identify Cd, Pb and Zn concentrations which exist in the roots and branches of Astragalus pycnocephalus Fischer and Verbascum euphraticum L. plants which grow in the Görgü (Yesilyurt-Malatya-Turkey) Pb-Zn mining area. A total of 60 samples were collected, 30 samples from plants and 30 samples from the soils where the plants grow. Cd concentrations range between 42.2 - 110.2 mg/kg, Pb: 2198 - \u3e10000 mg/kg and Zn: 6088 - \u3e10000 mg/kg in the soil where A. Pycnocephalus plants grow. Cd concentrations range between 4.1 - 544 mg/kg, Pb: 6918 - \u3e10000 mg/kg and Zn: 5020 - \u3e10000 mg/kg in the soil where V. Euphraticum grow. When the anaytical results gained are statistically examined, according to correlation coefficients graphic between the soil and plant, finding positive correlation between (A. Pycnocephalus) soil-root (Cd, r =0.77), soil-branch (Cd, r =0.86) and soil-branch (Pb, r =0.77) could mean that these could be indicator plants and can be used for remediation of the soils polluted by Cd and Pb metals. It is observed that the metallic concentration times values of the plants in this study taken from polluted areas compared to the plants taken from unpolluted areas, are quite high in total 44 samples (Cd, Pb and Zn values are quite high in 7, 30 and 7 samples respectively). Transition factor is \u3e1 in some sample locations and range between 0.13 and 2.07. Enrichment coefficients is \u3e1 for the location of V11 (Cd, root/soil). A. Pycnocephalus and V. Euphraticum, in some locations, according to transition factor, enrichment coefficients, times values and element concentrations could be identified as accumulator/hyperaccumulator for Cd, Pb and Zn elements.
DOI: 10.19111/bulletinofmre.30619
GEOGRAPHICAL INFORMATION SYSTEMS BASED USING LOGISTIC REGRESSION LANDSLIDE SUSCEPTIBILITY ASSESSMENT OF THE ÇUBUK-KALECİK (ANKARA) BETWEEN ŞABANÖZÜ (ÇANKIRI) REGION
No full textLandslides frequently occur particularly in certain parts in our country as well as in the world. They sometimes turn into natural disaster and cause socio-economic losses in significant magnitude. In this study, the landslide susceptibility analysis was performed in a total area of 2360 km2 at 1/100,000 scale in map sheet of Çankırı-H30. According to the inventory map, 4,79% of the study area is formed of landslide areas and the movement type of available landslides are generally observed in the form of rotational slip. According to the database of the Turkish Landslide Inventory Map prepared by MTA, there are 876 landslides, which cover an area of 122 km2, in the study area. A total of twelve independent variables for landslide conditioning factors were taken into consideration in susceptibility assessments being as; lithological map, land-use classification, digital elevation model, hill slope, profile, planar and tangential slope curvatures, roughness index, slope/aspect ratio, stream power index and topographic wetness index. The landslide susceptibility assessment was carried out using multivariate logistic regression method which is regarded as one of the statistical methods. As mapping unit; 25 x 25 m pixels were used for the statistical assessment. The obtained probability values of the landslide susceptibility maps were assessed in five different grades ranging from very low to very high. The performance evaluation of the susceptibility maps were performed by using the Receiver Operating Characteristic (ROC) and prediction success rate curves. The area under ROC curves were found to be in 0.794. Highly and very highly susceptible areas correspond to 28.06% of the entire area in which 78% of the landslides occurred. This accomplished, high performance landslide susceptibility map will make significant contributions to medium scale planning strategies. DOI: 10.19111/bulletinofmre.30669
APPLICATION OF TILT ANGLE METHOD TO THE BOUGUER GRAVITY DATA OF WESTERN ANATOLIA
No full textIn this study, tilt angle method was applied to Western Anatolia gravity data in order to estimate edges of the geological structures. Tilt angle was obtained in two different ways by using gravity and its vertical derivative. In potential field methods, tilt angle technique is expressed as the ratio of vertical derivative to horizontal derivatives of anomaly. In the tilt angle map, 0° contours defines structure edges, half of the distance between ±45° defines depth of upper structure. In the field work of the study, gravity data, which was measured in Western Anatolia, was used to obtain regional anomaly maps and tilt angle and tilt angle of vertical directional derivative were applied to these maps. A significiant difference was observed between western and eastern parts of the N-S striking line, througout 28o longitude, from the results of tilt angle which was obtained by applying upward continuation method (50, 75 and 100 km) to the Bouguer anomaly. Same difference was determined from the results of vertical derivative of tilt angle which was obtained from upward contuniation of Bouguer anomaly. Depth values were obtained from the results of tilt angle and vertical derivative of tilt angle methods between 7 and 43 km in study area. The obtained results were compared with geological structural boundary and possible depths of geological discontinuities were estimated. In addition, obtained results were investigated with seismic activity in the study area and compared with previous geological and geophysical studies.
DOI: 10.19111/bulletinofmre.30517
SEDIMENTOLOGY, MINERALOGY AND ORIGIN OF THE FIRST DISCOVER MAGNESITEDOLOMITE BELT IN MA’RIB DISTRICT, SW ARABIAN PENINSULA
No full textMagnesite mineralization of high purity was discovered and described herein for the first time from metamorphosed folded belt from Al-Thanyiah locality in Rub’Al-Khali sector, 360 km east of Sana’a City, northwest Yemen. The magnesite-metamorphic belt, belonging to the Precambrian/Neoproterozoic age? comprises thrust belt, which trends generally N-S direction. Magnesite mineralization was identified in an extended carbonate-metamorphic belt for several tens of kilometers cf. 31 km and occurred in association with 8 stratigraphic units. The thicknesses of pure magnesite bearing units are variable and ranges from 20 to 60 m, associated with dark green chlorite-schist with intersecting huge ultrabasic intrusions. Geochemical, mineralogical and petrographic analyses show that the magnesite concentrations in the stratigraphic units are ranging from 78% up to high purity of 99.6% cf. 35 to 48.9% MgO, with minor dolomite and calcite respectively. Little to rare content of talc and brucite were also recognized. Two thick, productive and high purity magnesite beds, the first is of 40 m thick and the second is 60 m in thickness, which reveals more than 95% MgCO3 and considered to be economic. The suggested origin of the magnesite mineralization is coming from high stress of regional metamorphism associated with ultramafic intrusions cf. amphibolite and harzburgite associated with diagenetic solutions rich in Mg2+, associated with the heat of magma. The alteration of dolomite to magnesite was formed by multiple phases to transform calcite and/or dolomite to magnesite
INVESTIGATION OF GÜLLÜK (MUĞLA) WETLAND BY STABLE ISOTOPES (δ18O, δD)
No full textWetlands play an important role in the hydrologic cycle. This investigation was completed to determine the origin of waters and recharge-discharge areas using stable isotopes (δ18O and δD) which are fingerprints of the water in Güllük (Muğla) wetland. This area is important both economically and in terms of aquaculture environment in Turkey. Sample locations were selected from not only wetlands but also the possible recharge area that consists of karstic springs and streams. EC (Electrical Conductivity) of the waters range between 5080-41000 µS/cm, except streams. δ18O and δD contents of the samples ranged from -6.00‰ to 0.50‰ and from -29.1‰ to 2.1‰, respectively. In general, samples plotted between Global and Local Meteoric Water line with waters also plotted on the seawater mixing line. The sources of salinity were evaluated by δ18O-Cl in and around the wetland. Streams are under the influence of “Evaporation”; samples from Avşar and Koruköy are under the influence of “Both Evaporation and Seawater Mixing”; İçme and Ekinambarı springs, and Limni Lake are under the influence of “Seawater Mixing”; and Savran spring and Tuzla Lake are under the influence of “Dissolution of Salts-Leaching” processes. The fact that Savran source plotted in this area raises the question of whether the current sea water is the source of salinity. The recharge area of the wetland consists of karstic formations, sea water, streams and precipitation in the Güllük area