Alpine porphyry copper mineralization of West Romania     

V. Ianovici  Ş. Vlad  M. Borcoş  S. Boştinescu 《Mineralium Deposita》1977,12(3):307-317

Alpine porphyry copper ores located in West Romania belong to the major Alpine belt developed from the Carpathians up to the Eastern Asia. They occurred along subduction zones in regions of thin continental crust characteristic of the complicated geotectonic Thetian environment during Laramian and Neogene metallogenic events. The porphyry copper ores consist of small size subvolcanic bodies with concentric alteration zones and Cu-Mo (Au) mineralization which exhibit similitudes with the Lowell and Guilbert model during Laramian times and with the diorite model during Miocene times. The magmatism related to porphyry copper mineralization is commonly Cu rich and restricted to insignificant sialic contamination. The spatial distribution of the ores is controlled by N-S Laramian tectonomagmatic alignments (Banat) and NW trending Neogene basins along extransverse faults (Metaliferi Mountains).

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Résumé Les minéralisations de cuivre porphyriques de la Roumanie occidentale appartiennent à la ceinture majeure qui s'étend depuis les Carpates jusqu' à l'Asie orientale. Leur occurrence le long des zones de subduction dans les régions à croûte continentale mince est caractéristique pour le compliqué milieu géotectonique thetien, au cours de la métallogenèse laramienne et néogène. Le cuivre porphyrique du type Cu-Mo (Au) est représenté par des corps subvolcaniques de dimensions réduites, à zonalité d'altération concentrique; la minéralisation laramienne peut être assignée au modèle de Lowell et Guilbert et la minéralisation néogène au modèle dioritique. Le magmatisme générateur est, en général, riche en cuivre et limité à une contamination sialique modique. La distribution spatiale des minéralisations est contrôlée par des alignements tectonomagmatiques laramiens orientés N-S (Banat), ainsi que par la disposition NO-SE des basins néogènes formès aux dépens des anciennes fractures transversales (Monts Metaliferi).

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Bericht über die Arbeiten ichthyologischer und fischereilicher Art,die für die 13. Arbeitssitzung der Internationalen Arbeitsgemeinschaft Donauforschung vorgelegt wurden     

Prof. Dr. Th. Buşniţa 《Aquatic Sciences - Research Across Boundaries》1971,33(1):322-333

Ohne Zusammenfassung  相似文献   

Hydrothermaler Sepiolith von Vărad (Moldova Nouă-Banat)     

Dr. D. Gheorghiţescu  Dr. Alexandrina Medeşan 《Mineralogy and Petrology》1972,17(3):189-195

Zusammenfassung Der Sepiolith von Vrad wurde in kupfererzführenden Magnesiumskarnen, in porphyrischen Granodioriten der Banatoprovinz und im kontaktmetamorphen oberjurassischen Kalk als hydrothermales Umwandlungsprodukt des Serpentins aus den Magnesiumskarnen und als gangförmige Absetzung einer späten hydrothermalen Phase vorgefunden.

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Hydrothermal sepiolite from Vrad-Moldova Nou (Romania)

Summary Sepiolite occurs at Vrad-Moldova Nou (1) in the magnesian cupriferous skarns, (2) in the porphyric granodiorites (banatites) and (3) in contact metamorphic upper jurassic limestones.The nature of this minearl is interpreted as hydrotermal; it is of hydrothermal origin and results from alteration processes of magnesian minerals (serpentine) or from direct precipitation from late hydrothermal solutions.

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Mit 3 Abbildungen  相似文献   

Natural and fallout radioactivity levels and radiation hazard evaluation in soil samples     

M. Karataşlı  Ş. Turhan  A. Varinlioğlu  Z. Yeğingil 《Environmental Earth Sciences》2016,75(5):424

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Preliminary investigation of underground settlements of Nevşehir Castle region using 2.5-D electrical resistivity tomography: Cappadocia,Turkey     

Nart Coşkun  Özcan Çakır  Murat Erduran  Yusuf Arif Kutlu  Ali Yalçın 《Arabian Journal of Geosciences》2016,9(18):717

The Nev?ehir Castle region located in the middle of Cappadocia with approximately cone shape is investigated for the existence of an underground city using the geophysical method of electrical resistivity tomography. Underground cities are commonly known to exist in Cappadocia. The current study has obtained important clues that there may be another one under the Nev?ehir Castle region. Several 2.5-D resistivity profiles totaling approximately 4 km in length surrounding the Nev?ehir Castle are measured to determine the distribution of electrical resistivities under the study area. Several high resistivity anomalies with a depth range 8–20 m are discovered to associate with a systematic void structure beneath the Nev?ehir Castle. Because of the high-resolution resistivity measurement system currently employed, we were able to isolate the void anomalies from the embedding structure. Using 3-D visualization techniques, we show the extension of the void structure under the measured profiles.  相似文献   

Assessment of water quality for drinking and irrigation purposes: a case study of Başköy springs (Ağlasun/Burdur/Turkey)     

Fatma Aksever  Ayşen Davraz  Yaşar Bal 《Arabian Journal of Geosciences》2016,9(20):748

It is important to know the quality of water resources for drinking, domestic and irrigation in the rural area. Because, in recent times, there has been increased demand for water due to population growth and intense agricultural activities, so, hydrogeochemical investigations come into prominence for the groundwater use. The purpose of this paper is to evaluate water quality of Ba?köy springs for both drinking and irrigation purposes. The geochemical processes and quality of springs were followed as seasonal in the study area. In view of geochemical classification, springs are Ca-Mg-HCO₃ water type for both seasons. Comparison of geochemical data shows that majority of the spring samples are suitable for drinking water. On the other hand, chemical indexes of springs with various classifications were calculated for irrigation purposes. According to the classifications (electrical conductivity, total dissolved solids, total hardness, salinity hazard, percent sodium, sodium adsorption ratio, residual sodium carbonate, residual sodium bicarbonate, permeability index, potential salinity, soluble sodium percentage, magnesium ratio, and Kelly’s ratio), Ba?köy springs are suitable for irrigation purposes. However, water quality of Çaygözü spring is different the other springs due to the high electrical conductivity and total dissolved solids. Also, groundwater mineralization processes and rock–water interaction are controlled with bivariate diagrams of major elements.  相似文献   

Remarks on the photogravitational restricted three-body problem     

Ioan Todoran 《Astrophysics and Space Science》1993,201(2):281-285

The effects of the radiation pressure in the restricted three-body problem are considered and the existence of the out-of-plane equilibrium points is analyzed. It is found that within the framework of the stellar stability, the five Lagrangian points are the only equilibrium points, at least as far as the force of the radiation pressure is taken into account.  相似文献   

Solid-liquid interfacial reaction of Zn ions on the surface of amorphous aluminosilicates with various Al/Si ratios     

Akane Miyazaki  Ioan Balint 《Geochimica et cosmochimica acta》2003,67(20):3833-3844

The adsorption behavior of Zn²⁺ ions onto the surface of amorphous aluminosilicates was studied using both potentiometric and spectroscopic methods (XANES: X-ray Absorption Near-Edge Structure). The aluminosilicates were prepared with different Al/Si ratios in order to compare the reactivities of surface aluminol and silanol groups toward Zn²⁺ ions. Potentiometric experiments were performed by maintaining the reacting suspensions at constant pH, ionic strength, and solid concentration, while Zn concentration was increased by stepwise addition. Our results showed that the surface aluminol and silanol groups possess significantly different reactivities toward Zn²⁺ ions. The reaction of Zn²⁺ ions with aluminol groups occurs through three processes: (i) surface complexation, (ii) dissolution, and (iii) re-sorption. A stoichiometric relationship was confirmed for the surface complexation between the aluminol groups and Zn²⁺ ions: two moles of H⁺ ions were released for one mole of Zn²⁺ ion adsorption. Following the surface complexation process, measurable amounts of zinc and aluminum ions were found to be mobilized from the surface of the solid to the liquid phase; subsequently, these ions precipitated on the solid surface, and possibly formed a co-precipitate with the hydrotalcite-type structure. On the other hand, a stoichiometric relationship was not obtained for the sorption of Zn²⁺ ions on silanol groups, and therefore, it was concluded that Zn²⁺ ions are retained on the surface of amorphous aluminosilicates by two different reactions. One reaction involves the surface complexation between Zn²⁺ ions and surface aluminol groups, which proceeds rapidly. The other reaction is the slow retention of Zn²⁺ ions onto silanol and/or aluminol groups, which could be the surface precipitation of Zn(OH)₂ or the co-precipitation of Zn²⁺-Al³⁺ hydroxides. It can be suggested that the total sorption behavior of Zn²⁺ ions on amorphous aluminosilicates with different Al/Si ratios can be represented as the sum of the individual reactions of Zn²⁺ ions toward the aluminol and silanol groups. The potentiometric results were confirmed by XANES data. It was clearly evident that only the aluminol groups were responsible for surface complexation of Zn²⁺ ions. An equilibrium constant was calculated for this reaction.  相似文献   

Some geographical remarks on education and prints in the languages of ethnic groups in Romania     

Mircea Buza  Ioan Ianoş 《GeoJournal》1994,34(4):457-465

The network of undergraduate schools comprises 2,336 schools and sections in towns and the countryside, especially in Transylvania, Criana, Maramure and Banat. Preschool and primary education is given in Hungarian, German, Ukrainian, Russian, Serbian, Bulgarian, Slovak, Czech, Croat, Turkish, Polish and the Gypsy languages. Secondary and high-schools function only in Hungarian, German and Serbian. Instruction in Hungarian, German, Serbian, Slovak and the Ukrainian languages is given within some sections opened at certain secondary and high-schools. Publications, however, are far more numerous — newspapers and journals, magazines and reviews are issued in sixteen languages: Hungarian, German, Gypsy, Serbian, Bulgarian, Ukrainian, Turkish, Russian, Slovak, Czech, Armenian, Yiddish, Greek, Polish, Italian and Albanian. Some of these publications are bilingual, articles being written in Romanian, too, and others only in Romanian.  相似文献   

The photogravitational restricted three-body problem     

Ioan Todoran 《Astrophysics and Space Science》1994,215(2):237-243

The photogravitational restricted three-body problem is reviewed and the case of the out-of-plane equilibrium points is analysed. It is found that, when the motion of an infinitesimal body is determined only by the gravitational forces and effects of the radiation pressure, there are no out-of-plane stable equilibrium points.  相似文献