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Articles 871 - 900 of 1881

Full-Text Articles in Earth Sciences

New Remarks On The Lithology And Biostratigraphy Of The Cretaceous Deposits From Istria Depression (Black Sea Shelf), Larisa Tertiș, Ioan I. Bucur, Emanoil SăSăRan, Lucreția Ghergari Mar 2012

New Remarks On The Lithology And Biostratigraphy Of The Cretaceous Deposits From Istria Depression (Black Sea Shelf), Larisa Tertiș, Ioan I. Bucur, Emanoil SăSăRan, Lucreția Ghergari

Studia UBB Geologia

The lithological and micropaleontological study of samples collected from several boreholes drilled in the Mesozoic deposits of Istria Depression (Black See shelf) allowed the characterization of intersected Cretaceous successions. Berriasian - Valanginian deposits are terrigenous, represented mainly by sandstones in the lower parts, and clays above. It is impossible to document the presence of Hauterivian-Aptian deposits in the succession. The Albian deposits are still terrigenous (predominantly clays, sometimes with sponge spicules). The Cenomanian transgressive deposits are coarser, and contain Conicorbitolina conica (d’Archiac), Rotalipora cushmani (Morrow) and Hedbergella-Praeglobotruncana sp. The following Turonian?-Campanian-Maastrictian deposits are micritic limestones with planctonic foraminifera in specific …

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Quelques Donnees Micropaleontologiques Qui Indiquent La Presence Du Badenien (Inferieur Et Superieur) A Cluj-Napoca (Roumanie), Anca-Andreea Suciu Mar 2012

Quelques Donnees Micropaleontologiques Qui Indiquent La Presence Du Badenien (Inferieur Et Superieur) A Cluj-Napoca (Roumanie), Anca-Andreea Suciu

Studia UBB Geologia

Some Micropaleontological data indicating the presence of (lower and upper) Badenian at Cluj-Napoca (Romania). In the central part of the city of Cluj-Napoca some excavations (in Cetăt̡uia Hill), drillings and waste-water collecting galery (at Abator Place) intercepted the Badenian deposits. The age of deposits from Cetăt̡uia Hill is lower Badenian. The analysis of the micropaleontological samples collected from the Badenian deposits (from Abator Place - drillings and waste - water collecting galery), revealed the presence of foraminifers and pteropods, of the lithostratigraphic unit “Spirialis marls”, indicating for the first time, at Cluj-Napoca, the presence of the upper Badenian.

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Influence Des Travaux Miniers Sur L'Evolution Du Karst Developpe Sur Les Sulfates, De L'Ouest De L'Ukraine, Lesya Shkitsa Mar 2012

Influence Des Travaux Miniers Sur L'Evolution Du Karst Developpe Sur Les Sulfates, De L'Ouest De L'Ukraine, Lesya Shkitsa

Studia UBB Geologia

Dans la province riche en sulfates de l’ouest de l’Ukraine, les changements du régime hydrogéologique induites par les activités technologiques reviennent aux travaux miniers qui ont provoqué l’intensification de l’extension du karst et d’effondrements des terrains. On montre les conditions hydrochimiques et les facteurs qui contrôlent le développement du karst dans la région.

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Ecological Safety Of The Carpathian Region As A Process Of Oil And Gas Complexes Functioning, Georgiy Rudko Mar 2012

Ecological Safety Of The Carpathian Region As A Process Of Oil And Gas Complexes Functioning, Georgiy Rudko

Studia UBB Geologia

There have been considered the main ecological problems of Western Ukraine and changes of geological environment under the influence of oil and gas complexes functioning. Ecochemical investigations of the environment give us a possibility to reveal the areas with abnormal hydrocarbon concentration in the near-surface layers and in ground waters. On the basis of the investigation results there have been worked out organizational, technological and environmental measures to eliminate pollution or to reduce its negative influence on geological environment.

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A Rare Eocene Water Lily (Nymphaea) Fossil From Cheile Baciului (Cluj-Napoca, Romania), László Lo̒Ra̒Nt Fehér Mar 2012

A Rare Eocene Water Lily (Nymphaea) Fossil From Cheile Baciului (Cluj-Napoca, Romania), László Lo̒Ra̒Nt Fehér

Studia UBB Geologia

A rare water lily (Nymphaceae) fossil is reported from the Late Eocene (Priabonian) deposits from Cheile Baciului limestone quarry (Cluj-Napoca, Romania). The remains consist of a piece of rhizome and a few root impressions preserved on the bearing rock. The fossil was identified as belonging to Nymphaea cf. alba Linnaeus. The rhizome of this species has never been found together with root impressions in Transylvania, being a very rare find even in Central Europe.

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A Review Of The Eocene Diodontids And Labrids From Transylvania, Emanuel Paul Dica Mar 2012

A Review Of The Eocene Diodontids And Labrids From Transylvania, Emanuel Paul Dica

Studia UBB Geologia

This paper reviews two diodontids and labrids species: Chylomicterus hilgendorfi and Lachnolaimus multidens. The paleontological material is represented only from jaws and pharyngeal bones, which had been recently collected from Cluj Limestone (Cluj Napoca and Turbut̡a areas), and Nis̡ului Valley Formation (Turnu Ros̡u) as well as from older collections. The holotypes of these species are reconsidered and the paleoecological significances are also discussed.

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A Revision Of The Rona Member, Vlad A. Codrea, Emanoil SăSăRan Mar 2012

A Revision Of The Rona Member, Vlad A. Codrea, Emanoil SăSăRan

Studia UBB Geologia

Lacustrine deposits occurring in the Jibou Formation (Late Maastrichtian – Lutetian) were mentioned in the Rona village area since the first half of the 19th century. Hungarian and Romanian geologists also carried out several researches in the last century, referring to the so-call “Rona Limestone” or “Rona Member”. In the last years, new outcrops resulted as a consequence of works made for the Botanical Garden at Jibou, adding details concerning mainly the base of the lacustrine succession. The new geological section from Jibou Botanical Garden should complete the old stratotype of the "Rona Limestone”, as a hypostratotype.

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New Lithostratigraphic And Structural Aspects In The Southern Part Of The Bihor Massif (Apuseni Mountains), I. Balintoni, A. Puște Mar 2012

New Lithostratigraphic And Structural Aspects In The Southern Part Of The Bihor Massif (Apuseni Mountains), I. Balintoni, A. Puște

Studia UBB Geologia

The Muncel Series (Ionescu, 1962), from the Bihor massif can be included in the Permian Pă ius̡eni Lithogroup, because it consists predominantly from weak metamorphosed granites and porphyres. In this idea, the Highis̡ Nappe correlates with the Muncel Nappe and does not with the Poiana Nappe. Consequently, the down to up succession of the Biharia Nappe System becomes: the Gârda Nappe; The Ravices̡ti scale; the Poiana Nappe; the Piatra Grăitoare scale; the Biharia nappe; the Highis̡-Muncel Nappe; the Baia de Aries̡ Nappe.

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The Arieseni Nappe, Or The Moma And Poiana Nappes?, I. Balintoni, L. Ghergari, T. BăBuț Mar 2012

The Arieseni Nappe, Or The Moma And Poiana Nappes?, I. Balintoni, L. Ghergari, T. BăBuț

Studia UBB Geologia

The Arieseni Nappe was the single tectonic unit of the Biharia Nappe System involving unmetamorphosed, red Permian and metamorphosed, green Permian deposits. Deformational, microscopic and x-Ray diffraction studies, suggest a tectonic relationship between the two sequences. Consequently, the red Permian deposits have been attributed to the Moma Nappe, and the green Permian rocks to the Poiana Nappe. Thus, the Arieseni Nappe disappeared. The thrust between the red Permian and the green Permian deposits realized later during the emplacement of Apusenides, due to an east-verging movement.

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Salt Works And Their Impact On Soil And Groundwater. The Cases Of Anghelohori And Kitros, Greece, Christodoulos Angelopoulos, Evangelos Nicolaou Mar 2012

Salt Works And Their Impact On Soil And Groundwater. The Cases Of Anghelohori And Kitros, Greece, Christodoulos Angelopoulos, Evangelos Nicolaou

Studia UBB Geologia

Contamination of soil and groundwater caused to salt works occurs due to infiltration of a part of seawater from the lakes of salt works through the soil and into phreatic aquifers and from there percolating to artesian aquifers. In the same time, while salt remaining in place is washed out by rain, contaminating soil and both phreatic and artesian aquifers. In the areas of Angelohori and Kitros this contamination of soil has been detected through chemical analysis while groundwater contamination has been suggested through pressure level contours.

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Principii De Cristalografie; Cristalografie Geometrica (Caiet De Lucrari Practice), G. Udubașa Mar 2012

Principii De Cristalografie; Cristalografie Geometrica (Caiet De Lucrari Practice), G. Udubașa

Studia UBB Geologia

No abstract provided.

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A Comparative Study Between Loss On Ignition And Total Carbon Analysis On Mineralogenic Sediments, Daniel Ș. Vereș Mar 2012

A Comparative Study Between Loss On Ignition And Total Carbon Analysis On Mineralogenic Sediments, Daniel Ș. Vereș

Studia UBB Geologia

The present study deals with a comparison between organic and carbonate content determinations based on loss-on-ignition and step-wise total carbon analysis, and a correlation to grain-size. Although loss-on-ignition can generally be regarded as an accurate measure of the organic mater content of a sediment, the amount of fine fraction in the sediments is a limiting factor for an absolute organic determination and influences directly the correction factor. The same holds true for carbonate content determinations based on loss on ignition. In order to provide accurate organic and carbonate content determinations for a sediment, loss-on-ignition data must be corroborated by standard …

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Gold In Metamorphic Rocks: Facts And Fancy, Gheorghe Udubașa, Sorin Silviu Udubașa Mar 2012

Gold In Metamorphic Rocks: Facts And Fancy, Gheorghe Udubașa, Sorin Silviu Udubașa

Studia UBB Geologia

The characterization of shear zone related ores (SZRO) is still a matter of debate. In an attempt to attenuate the existing controversial points of view some classifications of the SZRO are here proposed, taking into account both their mineralogy and geochemistry (protore nature, ore minerals assemblages etc.) and their size. The small scale SZRO seem to depend on the existence of a protore, as a source of metals, whereas the large scale SZRO may have an epigenetic overprint and the source of metals can be multiple, juvenile included. Finally, a fractal-like classification of ore deposits is proposed, in which the …

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Contributions On The Mineralogy Of The Corund Carbonate Deposit, Tóth Attila Mar 2012

Contributions On The Mineralogy Of The Corund Carbonate Deposit, Tóth Attila

Studia UBB Geologia

The carbonate deposit with aragonitic aspect from Corund (Harghita county) is the result of post-volcanic phenomena, and it is deposited from salty bicarbonatic springs. Mineralogically it consists of calcite, magnesium calcite and aragonite. Most of the calcite layers are in fact paramorphoses after aragonite, fact revealed by the diagenetic processes.

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Hydrovolcanic Breccia Pipe Structures-General Features And Genetic Criteria. I. Phreatomagmatic Breccias, CăLin G. TăMaș, Jean P. Milési Mar 2012

Hydrovolcanic Breccia Pipe Structures-General Features And Genetic Criteria. I. Phreatomagmatic Breccias, CăLin G. TăMaș, Jean P. Milési

Studia UBB Geologia

Two types of hydrovolcanic breccias are generally accepted: phreatomagmatic and phreatic. Due to their specific characteristics generated during the brecciation, characteristics that control the ore deposition, these breccias represent favourable hosts for mineralization. The depth of formation, the general form and dimensions, the breccia - host rock contact, as well as fragments, matrix, and open spaces altogether control the position and the size of the breccia hosted ore bodies and contribute in different degrees to the rise of the ore grades in phreatomagmatic and phreatic structures. Consequently, the recognition of the genetic type of breccia allows an appropriate strategy in …

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The Impact Of The Bituminous Coal Combustion From The Thermoelectric Power Plant From Paroseni On The Environment Of Jiu Valley, Mircea Rebrișoreanu, Eugen Traistă, Aronel Matei, Ovidiu Barbu, Vlad A. Codrea Mar 2012

The Impact Of The Bituminous Coal Combustion From The Thermoelectric Power Plant From Paroseni On The Environment Of Jiu Valley, Mircea Rebrișoreanu, Eugen Traistă, Aronel Matei, Ovidiu Barbu, Vlad A. Codrea

Studia UBB Geologia

The Jiu Valley Basin is one of the most important coal mining areas in Romania. Other industries, including a power plant, are also well developed in this area. Therefore, pollution is very high. One of the most polluted environmental compounds is the air. High mountains surround the Jiu Valley, which makes difficult the air refreshing. For this reason, it is very important to discuss the air pollution and especially that produced by dust. Since the industrial companies are concentrated in a small area, it is very difficult to identify and prosecute the polluting one. The present paper aims to identify …

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Implications Resulting From The Study Of The Fluid Inclusions In The Shear Zone-Type Gold Mineralization From Bozovici (Banat) And Somesul Rece (Gilau Mountains), Vasile PomâRleanu, Ioan MâRza Mar 2012

Implications Resulting From The Study Of The Fluid Inclusions In The Shear Zone-Type Gold Mineralization From Bozovici (Banat) And Somesul Rece (Gilau Mountains), Vasile PomâRleanu, Ioan MâRza

Studia UBB Geologia

The paper presents the results of a study on fluid inclusions (petrography, chemistry, Th, Td) from the gold-containing quartz in the shear zone – type mineralizations from Bozovici (Banat) and Some¿ul Rece (Gil¾u Mountains). Four types of fluid inclusions were identified: A – aqueous, AS – aqueous with efflorescences and crystals of nahcolite, C – monophasic and biphasic containing CO2, and AC – aqueous solutions with CO2. Microthermometry (Th and Td) indicated homogenisation temperatures of nahcolite between 136-2600 C, total homogenisation temperatures of 283-3900 C, and a maximum temperature (Td) between 380-4200 C. The molar content of the CO2/H2O ratio …

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Preliminary Data On The Mineralogy Of Limestone And Skarn-Hosted Caves From Baita (Bihor County, Romania), Bogdan P. Onac, Paul Damm Mar 2012

Preliminary Data On The Mineralogy Of Limestone And Skarn-Hosted Caves From Baita (Bihor County, Romania), Bogdan P. Onac, Paul Damm

Studia UBB Geologia

This paper presents the mineralization of five medium-size limestone-caves and eleven skarn-hosted caves from the upper part of Cri¿ul B¾ißei River (Bihor Mountains). Apart from berlinite – AlPO4, the other minerals reported from the limestone caves are common carbonates, phosphates or oxy-hydroxides. In turn, the skarn-hosted caves contain a diversity of minerals, including wittichenite, luzonite, natrolite, norsethite, rosasite, glaukosphaerite, aurichalcite, azurite, malachite and chalcanthite. Five of these minerals have never before been identified in a cave environment and moreover, three are new occurrences in Romania. Some of these minerals are hydrothermal in origin, whereas alteration and/or hydration of primary hydrothermal …

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Arenite Concretions With Axial Channel From The Badenian Deposits Of Cheia (Turda) - A New Type Of Concretions, Ioan Mârza, Ciprian Constantina, Horea PâRlea Mar 2012

Arenite Concretions With Axial Channel From The Badenian Deposits Of Cheia (Turda) - A New Type Of Concretions, Ioan Mârza, Ciprian Constantina, Horea PâRlea

Studia UBB Geologia

The paper introduces a new type of arenite concretions (max. 40-50 cm in diameter). Spheroidal concretions with an axial cylindrical channel (1-6 cm in diameter) resulted from the levigation of the concretion centre consisting of soft fusiform clasts with a clayey-carbonate composition. The concretions are hosted by a level of Badenian sandstones and microconglomerates (about 10-m thick) which occur in the place called “Groapa cu Piersici” (Cheia, Turda).

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Characterisation Of Some Clays Used For Whiteware Ceramics, Ii. Technological Characterization, Maria Gorea, Marcel Benea Mar 2012

Characterisation Of Some Clays Used For Whiteware Ceramics, Ii. Technological Characterization, Maria Gorea, Marcel Benea

Studia UBB Geologia

The paper investigates the mineral composition of four diferent clay types used for whiteware ceramics, correlated to the measured mineralogical and chemical composition, particle size distribution and technological characteristics (plasticity, drying, and firing shrinkage, dry resistance). According to their particle size distribution, the U-II, U-III and ESV3 clay types are almost identically, but the mineralogical composition is different. On the other hand, the CARO clay type has a very similar kaolinite and quartz content with U-II clay, but shows a completely different particle size distribution. Based on the mineralogical and particle size distribution, CARO clay type shows the most suitable …

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Transport And Emplacement Of The 15.4 Ma Rhyolitic Ignimbrites From Gutai Mts., Eastern Carpathians, Alexandrina FüLöP Mar 2012

Transport And Emplacement Of The 15.4 Ma Rhyolitic Ignimbrites From Gutai Mts., Eastern Carpathians, Alexandrina FüLöP

Studia UBB Geologia

The 15.4 Ma rhyolitic ignimbrites are the first volcanic products from Gutâi Mts. The study of their sedimentary structures reflects the mechanisms involved in the transport and emplacement of the parental flows, essential to inffering the style of eruption and the source evolution and location. Primary sedimentary structures show massive deposits emplaced from mass flows, sequence of units showing the normal coarse-tail grading of the dense clasts and the reverse coarse-tail grading of the pumice clasts. They reflect concentrated laminar flows or dilute, subcritical flows emplaced by progressive aggradation. Secondary sedimentary structures are represented by the eutaxitic texture or welding, …

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Applicabilite De L'Etude Mineralogique Du Gisement Varatec Baiut (District Baia Mare) A La Valorification Du Minerai, Dan Costin Mar 2012

Applicabilite De L'Etude Mineralogique Du Gisement Varatec Baiut (District Baia Mare) A La Valorification Du Minerai, Dan Costin

Studia UBB Geologia

Le gisement épithermal Vratec Băiut̡ a un caractère polymétallique (Pb, Zn, Cu) avec des teneurs importants de métaux précieux (Au, Ag). Les minérales importants de point de vue économique sont la pyrite, la sphalérite, la galène, la chalcopyrite et l’or. L’étude minéralogique a permis d’établir la distribution des éléments chimique par minéraux porteurs et de mesurer les dimensions de grains minérales. Ces informations sont nécessaire pour préciser les opérations de traitement du minerai (procédés minéralurgiques et d’extraction des métaux) qui peuvent être appliquées dans l’étape de la valorisation. Les conclusions sont utilisées pour évaluer l’impact des opérations sur l’environnement.

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The Separation And The Concentration Of Minerals From The Zeolitic Volcanic Tuffs. Analytical Composition, Dumitru Bulgariu Mar 2012

The Separation And The Concentration Of Minerals From The Zeolitic Volcanic Tuffs. Analytical Composition, Dumitru Bulgariu

Studia UBB Geologia

The separation and concetration of minerals from zeolitic volcanic tuffs represent one of the problems for which the literature not offer, to much practically solutions. The experimental strategy used by as, for the separation minerals from zeolitic volcanic tuffs to comprise the following methods: heavy liquids separation; magnetic separation and electrophoresis separation. For zeolites, silica polymorphs, feldspars and other minerals separated from zeolitic volcanic tuffs, the work eighth conditions and the proper experimental strategy efficiency has been estabilish. The purity for mineral fractions can be separated has been between 95.0 – 99.6 %.

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Characterisation Of Some Clays Used For Whiteware Ceramics I. Mineralogical Composition, Marcel Benea, Maria Gorea Mar 2012

Characterisation Of Some Clays Used For Whiteware Ceramics I. Mineralogical Composition, Marcel Benea, Maria Gorea

Studia UBB Geologia

In order to obtain a semiquantitative mineralogical composition of raw materials used for whiteware ceramics, four different clay types were analysed by X-ray diffraction. Studies were carried out by using a combination of analyses of the bulk sample, and of the fine fraction. Using a well-established pre-treatment methodology (use of chemicals, ultrasonic treatment, dispersion procedures), clay mineral concentration by centrifugation and sedimentation, oriented and random powder preparation, cation saturation, expansion/dehydration methods, 12 X-ray diffractometer traces were obtained from each sample. Based on these informations it was possible to establish the qualitative mineralogical composition, and also a semiquantitative one using peak …

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Profesorul Razvan Givulescu La 80 De Ani, Iustinian Petrescu Mar 2012

Profesorul Razvan Givulescu La 80 De Ani, Iustinian Petrescu

Studia UBB Geologia

No abstract provided.

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Middle Miocene (Badenian) Conidae From Lapugiu De Sus, Romania: Systematical And Palaeoecological Data, Carmen Chira, Ileana Voia Mar 2012

Middle Miocene (Badenian) Conidae From Lapugiu De Sus, Romania: Systematical And Palaeoecological Data, Carmen Chira, Ileana Voia

Studia UBB Geologia

The paper presents in synthesis the conids from Lăpugiu de Sus, especially those which are preserved in the collections of Palaeontology-Stratigraphy Museum of the Babeş-Bolyai University. Conids, carnivorous gastropods who lived in shallow waters from neritic zones, in warm seas, respectivelly subtropical to tropical, with a normal salinity, have been the most diversified gastropods at Lăpugiu de Sus during the Middle Miocene (Badenian). There are also species which could tolerate slight decreasing of salinity such as Conus (Conolithus) dujardini brezinae. It was remarked that the conids from Lăpugiu de Sus lived in the conditions of shore-offshore zones where the temperature …

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The Badenian Calcareous Nannoplankton From Turda And Ocna Dej Mines (Transylvanian Basin, Romania), Carmen Chira Mar 2012

The Badenian Calcareous Nannoplankton From Turda And Ocna Dej Mines (Transylvanian Basin, Romania), Carmen Chira

Studia UBB Geologia

Middle Miocene (Middle Badenian, respectivelly Wielician) clays interlayered with the salt deposits from Turda and Ocna Dej salt mines of the Transylvanian Basin have been analysed. The assemblages of calcareous nannoplankton/nannofossils and their significance are presented. Nannofloras are scarce and poorly preserved. The fossil index for NN5 Zone – Sphenolithus heteromorphus appears very rarely, only in few samples. The assemblages can be considered to belong to the upper part of the NN5 Zone and also to the lower part of the NN6 Zone.

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A Paleoecological Reconstruction Of The Late Glacial And Holocene Based On Multidisciplinary Studies At Steregoiu Site (Gutai Mts., Romania), Angelica Feurdean, Leif BjöRkman, Barbara Wohlfarth Mar 2012

A Paleoecological Reconstruction Of The Late Glacial And Holocene Based On Multidisciplinary Studies At Steregoiu Site (Gutai Mts., Romania), Angelica Feurdean, Leif BjöRkman, Barbara Wohlfarth

Studia UBB Geologia

High resolution analyses of pollen, mineral magnetic properties, loss of ignition, lithostratigraphy and AMS 14C measurements of lake sediments and peat deposits accumulated in the former crater lake of Steregoiu (Gutâiului Mts., NW Romania), gave new and important information about vegetation and climate changes from the period GS-2 to the present. During the Lateglacial, three cold events were recorded: before 14,700 cal. years BP (GS-2), 14,050–13,800 cal. years BP (GI-1d), 12,900-11,500 cal. years BP (GS-1), and a warm climatic event between 13,800-12,950 cal. years BP (GI-1c to GL-1a). The Late Glacial/Holocene transition around 11,500 cal. years BP, was determined by …

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Wielician Foraminifera At The Western Border Of The Transylvanian Basin, Sorin Filipescu Mar 2012

Wielician Foraminifera At The Western Border Of The Transylvanian Basin, Sorin Filipescu

Studia UBB Geologia

Marine Middle Miocene deposits at the top of Gârbova de Sus Formation preserve a particular foraminifera assemblage, with both benthic and planktonic taxa. Presence of several biostratigraphic significant species allowed an extension of the known age of the formation, up to Wielician. The morphogroups also suggest a deeper environment, compared to the rest of the formation. The change of fauna type at this level might be correlated to the start of a new global cycle.

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The Spatial Extension And The Age Of The Tomnatec Formation In Audia Nappe, Liviu Ionesi, Florin Florea Mar 2012

The Spatial Extension And The Age Of The Tomnatec Formation In Audia Nappe, Liviu Ionesi, Florin Florea

Studia UBB Geologia

No abstract provided.

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