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Articles 901 - 930 of 1881
Full-Text Articles in Earth Sciences
Palynological Researchers Concerning The Pontian On The Visenilor Valley And Boereasca Valley - Ne Of Drobeta Turnu Severin (Sw Romania), Iustinian Petrescu, Nicoleta Bican-Brișan, Cornel Meilescu, Ion PăTruțoiu
Palynological Researchers Concerning The Pontian On The Visenilor Valley And Boereasca Valley - Ne Of Drobeta Turnu Severin (Sw Romania), Iustinian Petrescu, Nicoleta Bican-Brișan, Cornel Meilescu, Ion PăTruțoiu
Studia UBB Geologia
Palynological analyses in the sections of Vişenilor Valley and Boereasca Valley (Upper Pontian (Bosphorian)) are presented in table 1. In the second part of paper, the authors made a comparison between microflora from Mehedinţi and other Pontian microfloras in Romania and from abroad (former Yugoslavia, Hungary, and Slovakia).
Upper Jurassic And Lower Cretaceous Sedimentary Formations From The Valcan Mountains (South Carpathians), Grigore Pop, Ioan I. Bucur
Upper Jurassic And Lower Cretaceous Sedimentary Formations From The Valcan Mountains (South Carpathians), Grigore Pop, Ioan I. Bucur
Studia UBB Geologia
The litho- and biostratigraphy of the Upper Jurassic-Lower Cretaceous formations cropping out in the southwestern part of Vâlcan Mountains is presented. Five formations were recognised in the studied area: Valea Pragurilor Formation, Valea Cheii Formation, Topeşti Formation, bioclastic-oolitic limestones from Sudoieşi valley and Izvarna Formation. The age of these formations is mainly based on foraminifera and calcareous algae.
Aspects Of Romanian Early Jurassic Palaeobotany And Palynology. Part Iv. A New Species Of Weltrichia From Anina, Mihai E. Popa
Aspects Of Romanian Early Jurassic Palaeobotany And Palynology. Part Iv. A New Species Of Weltrichia From Anina, Mihai E. Popa
Studia UBB Geologia
A new species of bennettite genus Weltrichia BRAUN, Weltrichia givulescui n.sp., is defined, described and discussed. Its age is Sinemurian and it was recorded associated with Zamites aninaensis foliage from Anina, South Carpathians, Resita Basin, where these species are confined to the upper sandstone sequences of the Valea Tereziei Member, Steierdorf Formation, between the Coal seams no. 6 and 8.
Liotia Ornata N.Sp. (Mollusca, Gastropoda) From Badenian Of Borod Basin (Nw Romania), Mirela Popa
Liotia Ornata N.Sp. (Mollusca, Gastropoda) From Badenian Of Borod Basin (Nw Romania), Mirela Popa
Studia UBB Geologia
A new small-sized gastropod species was identified in Badenian deposits (Borod Formation) in the eastern part of Borod Basin (west of Apuseni Mts.), and was described in this study under Liotia ornata n. sp.
Coralgal Facies Of The Upper Eocene-Lower Oligocene Limestones In Letca-Rastoci Area, Ioana Prica
Coralgal Facies Of The Upper Eocene-Lower Oligocene Limestones In Letca-Rastoci Area, Ioana Prica
Studia UBB Geologia
In this paper are described the coralgal facies identified in the Upper Eocene-Lower Oligocene limestone succession (Cozla Formation) outcropping in two quarries at Letca and Rastoci (Sălaj district, Romania). In the studied profiles the coral and algae limestones are interlayered with bioclastic limestones with foraminifera. On the top of relatively deep water deposits, coral and algae crusts and dendritic corals coated by algae were deposited. The environment registered a gradual deepening, the deposits being completely immersed, while bioclastic limestones with foraminifera were recurrently formed. This cycle is repeated, the whole succession being caracterized by several such “parasequences”.
Microfacies And Microfossils In Upper Jurassic Limestones From Cheile Turenilor, Emanoil SăSăRan, Ioan I. Bucur, Ioana Prica
Microfacies And Microfossils In Upper Jurassic Limestones From Cheile Turenilor, Emanoil SăSăRan, Ioan I. Bucur, Ioana Prica
Studia UBB Geologia
In the Cheile Turenilor (Tureni Gorges) area, a carbonate succession about 150 m thick developed on top of island arc magmatites. It mainly consist of gravity - induced deposits (debris flows, mass flows and grain flows). Coral, sponges and stromatoporoid bioconstructions are associated. Microbolites play an important role, as binders of the intraclastic rudstones/ grainstones facies, as well as of the incorporated corals, sponges, stromatoporoids, bryozoans, molluscs.
Contributions To The Knowledge Of Flora And Vegetation Of The Tertiary In The Extracarpathian Area Of Romania, RăZvan Givulescu
Contributions To The Knowledge Of Flora And Vegetation Of The Tertiary In The Extracarpathian Area Of Romania, RăZvan Givulescu
Studia UBB Geologia
The author presents the fossil flora and vegetation of the extracarpathian regions of Romania: on one hand, the Eocene-Oligocene-Late Dacian fossil floras from the southern area, and on the other hand - the Sarmatian ones from the eastern area. It is insisted on the Sarmatian as compared to the one from Transylvania. There are important similarities with the southern area, but none as concerns the eastern one. The characteristic feature of the area comprised between the Carpathians and the Prut is the absence of the Lauraceae and the massive presence of Betulaceae. The author suggests the creation of a palaeofitogeographic …
Genesis Of Magmatic Derived Ore Deposits. 4 – Hydrothermal Metallogeny (Geneza Zăcămintelor De Origine Magmatică. 4 – Metalogenia Hidrotermală), CăLin G. TăMaș
Genesis Of Magmatic Derived Ore Deposits. 4 – Hydrothermal Metallogeny (Geneza Zăcămintelor De Origine Magmatică. 4 – Metalogenia Hidrotermală), CăLin G. TăMaș
Studia UBB Geologia
No abstract provided.
Sedimentologie - Petrologie (Culegere De Lucrări Ştiinţifice), Ioan MâRza
Sedimentologie - Petrologie (Culegere De Lucrări Ştiinţifice), Ioan MâRza
Studia UBB Geologia
No abstract provided.
Contributions To The Study Of The Alluvial Gold From Valea Pianului Area (Alba District), Horea Bedelean, Aura Bedelean
Contributions To The Study Of The Alluvial Gold From Valea Pianului Area (Alba District), Horea Bedelean, Aura Bedelean
Studia UBB Geologia
Pianu de Sus area (Alba district) is located in the north-eastern part of the Sebeş Mountains. The region consists of metamorphic (Sebeş-Lotru group), magmatic (granites and quartziferous porphyries and pegmatites) and sedimentary deposits (Senonian, Neogene and Quaternary age). Granulometric studies, separations of the heavy fractions, optic and electronic microscopic investigations were performed on the alluvial deposits and detritic sedimentary formations. The analysed gold shows tipical morphology for two grains types: primary and secondary. From a chemical point of view was evidenced electron microprobe The chemical analyses, performed by using electron microprobe, shows a high amount of gold and silver.
Using The Pollution Index To Characterize The Level Of Contamination Of The Aries River (Apuseni Mountains) (In Romanian), Forray Ferenc Lázár
Using The Pollution Index To Characterize The Level Of Contamination Of The Aries River (Apuseni Mountains) (In Romanian), Forray Ferenc Lázár
Studia UBB Geologia
In the present study we try to use a new index called "pollution index" for define the pollution level of river using the dissolved heavy metal concentrations. This index derives from Müller’s geoaccumulation index but use the dissolved metal concentrations. The river water samples collected between the municipalities of Cheia and Muncel along a 54-km stretch of the Aries River (NW Romania) were analysed by capillary electrophoresis for heavy metals. The primary results show that pollution index can be used for determination of pollution level of river in base of dissolved heavy metal concentration as is confirmed also by factor …
Carbon And Oxygen Isotope Ratios In Rona Limestone, Romania, Stela Cuna, Dana Pop, Alexandru Hosu
Carbon And Oxygen Isotope Ratios In Rona Limestone, Romania, Stela Cuna, Dana Pop, Alexandru Hosu
Studia UBB Geologia
The carbon and oxygen isotopic compositions of limestones provide criteria for the evaluation of the depositional environment. For Jurassic and younger samples, the best discrimination between marine and fresh-water limestones is given by Z parameter, calculated as a linear correlation between δ13C and δ18O (‰ PDB). Rona Limestone (Upper Paleocene - Lower Eocene), outcropping on a small area in NW Transylvania (Meseş area) is a local lacustrine facies. There, it divides Jibou Formation into the Lower Red Member and the Upper Variegated Member, respectively. Recently, a sequence containing a marine nannoplankton assemblage was identified in the base of Rona deposits. …
Historical, Geological, And Mining Benchmarks Concerning The Endogeneous Breccia Structures Associated With The Neogene Magmatic Events In Romania (In Romanian), CăLin G. TăMaș
Historical, Geological, And Mining Benchmarks Concerning The Endogeneous Breccia Structures Associated With The Neogene Magmatic Events In Romania (In Romanian), CăLin G. TăMaș
Studia UBB Geologia
An up-to date exhaustive bibliographic study is presented in order to highlight the evolution of the knowledge of endogenous breccias related to Neogene magmatism from Romania during the 19th and 20th centuries. This approach is based mainly on Romanian literature but there are also several foreign citations. Instead of the general opinion (widespread among Romanian mining companies) according to which the occurrence of the breccia structures in Romania is scarcely, this paper show the ubiquitous presence of breccia pipe and breccia dyke structures among the Neogene ore deposits from Romania, in Apuseni Mountains as well as in Eastern Carpathians.
New Data On The Volcanic Tuff From Petrestii De Jos (Cluj District), Horea Bedelean, Ioan Ivan, Dana Pop, Ioan Bedelean, Gheorghe Pleșoiu
New Data On The Volcanic Tuff From Petrestii De Jos (Cluj District), Horea Bedelean, Ioan Ivan, Dana Pop, Ioan Bedelean, Gheorghe Pleșoiu
Studia UBB Geologia
The present study was carried out on the cineritic interlayers from Petreştii de Jos (closed quarry from Indolului Valley), in order to present their detailed mineralogical-petrographical features. Previous work already noticed the similarity of this tuff level with Dej Tuff Complex in other areas. The studied outcrop consists of a compact volcanic tuff interlayered with marls and tuffaceous clays. The analytical investigations: chemical analyses, X-ray diffraction, IR spectroscopy and electron microscopy reveal the nature of the diagenetic transformations dominated by zeolitization. Besides clinoptilolite, which is the typical zeolite for Dej Tuff from the Transylvanian Depression, our investigation evidenced also the …
Tuffaceous Conglomerates: Syn-Eruptive Resedimented Debris Flow And Hyperconcentrated Flow Deposits From The "Rhyodacitic Formation", Gutai Mountains, Eastern Carpathians, Alexandrina FüLöP
Tuffaceous Conglomerates: Syn-Eruptive Resedimented Debris Flow And Hyperconcentrated Flow Deposits From The "Rhyodacitic Formation", Gutai Mountains, Eastern Carpathians, Alexandrina FüLöP
Studia UBB Geologia
The first volcanic products from Gutâi Mts, Eastern Carpathians belong to the "Rhyodacitic Formation". The physical constituents of this formation are as follows: pyroclastic deposits (ignimbrites and fall tuffs), syn-eruptive resedimented volcaniclastic deposits, volcanogenic and non-volcanogenic sedimentary deposits. The tuffaceous conglomerates belong to the syn-eruptive resedimented volcaniclastics and represent the coarsest deposits. They outcrop in Băiţa area, west from Baia-Mare, being underlain by Lower Badenian (15.4±0.6 Ma) ignimbrites and overlain by Lower Sarmatian claystones. The main components of the conglomerates are boulders and cobbles of sedimentary and metamorphic rocks in a tuffaceous matrix. Scarse blocks eroded from the lower ignimbrite …
Geochemical Considerations Upon The Banatites From Budureasa-Pietroasa Area (Apuseni Mountains, Romania), Corina Ionescu, Nicolae Har
Geochemical Considerations Upon The Banatites From Budureasa-Pietroasa Area (Apuseni Mountains, Romania), Corina Ionescu, Nicolae Har
Studia UBB Geologia
Various methods (T.A.S., Irvine and Baragar, Maniar and Piccoli, and Pearce diagrams) were used for the characterization of the Budureasa-Pietroasa banatites. The global geochemical characteristics of the rocks are in good agreement with the general features of the banatites, however showing some peculiar differences.
Studies On Aries River (Apuseni Mountains) Pollution Using Factorial Analyses (In Romanian), Forray Ferenc Lázár
Studies On Aries River (Apuseni Mountains) Pollution Using Factorial Analyses (In Romanian), Forray Ferenc Lázár
Studia UBB Geologia
In the present study we try to use factor analysis in the characterisation of river water chemistry between the municipalities of Cheia and Muncel along a 54-km stretch of the Aries River (NW Romania). The results show that 4 factors can explain 88% of the water chemistry. The first factor explains 39% of the total data variance, and represents the water-rock interactions. This high percent indicates the importance of water rock interactions in defining the chemistry of surface waters. The second factor explains 23% of the data variation and represents the influence of mining effluents. The influence of the mine …
The Hardness Of Synthetic Products Obtained From Cooled And Crystallized Basaltic Melts (In Romanian), Daniela Ogrean
The Hardness Of Synthetic Products Obtained From Cooled And Crystallized Basaltic Melts (In Romanian), Daniela Ogrean
Studia UBB Geologia
The Hardness of Synthetic Products Obtained from Cooled and Crystallized Basaltic Melts. Hardness is one of the main properties of the products obtained from cooled and crystallized basaltic melts under a controlled thermal regime. It influences the abrasion tear resistance of the resulted material. The microhardness measurements on the samples (bricks, boards, gutters, armour plates, tubes) indicated Vickers hardness value between 757–926 for the materials obtained from Şanovita basalts (Timiş district) and between 539–958 respectively, in case of the Racoş basalts (Braşov district). There is a certain variation of the hardness within the same sample, in various measurement points, within …
A Possible Evolutionary Model Of The Apuseni Mountains And Of The Biharia Nappe System (In Romanian), Rodica Stan, Adrian Puște
A Possible Evolutionary Model Of The Apuseni Mountains And Of The Biharia Nappe System (In Romanian), Rodica Stan, Adrian Puște
Studia UBB Geologia
A Possible Evolutionary Model of Apuseni Mountains and of Biharia Nappe System. Our intention is to expose and outline a possible structural model for the Paleozoic evolution of the Apuseni Mountains and for the alpine evolution of some tectonic units belonging to the Biharia Nappe System. During the Paleozoic times, the tectonic units involved in this model migrated from the northern margin of Gondwana toward Laurasia, then collided in Variscan orogeny. The Biharia and Codru Nappe Systems were sheared from the Preapulian craton margins, and the Transylvanides were sheared from the Penninic rift, during the Alpine orogeny.
Tectonic Problems In The Western Part Of Padurea Craiului Massif (Apuseni Mountains) (In Romanian), Ioan Balintoni, Adrian Puște
Tectonic Problems In The Western Part Of Padurea Craiului Massif (Apuseni Mountains) (In Romanian), Ioan Balintoni, Adrian Puște
Studia UBB Geologia
Tectonic Problems in the Western Part of Pădurea Craiului Massif (Apuseni Mts.). Pădurea Craiului Massif belongs to Bihor Unit. The Codru Nappe System overthrusts its South-Western margin. The structures generated in the nappes front, such as folds, faults, fisures, cleavages, suggest a movement direction from South-West toward North-East. This direction differs with 90° relative to transport direction of Biharia Nappe System. The mentioned structures represent a prove for origin of Codru Nappe System from the Meliatic margin of Preapulian Craton.
Late Quaternary Palaeoclimate Reconstruction Based On Clay Minerals Assemblage From Preluca Tiganului (Gutai Mountains, Romania), Lucreția Ghergari, Bogdan P. Onac
Late Quaternary Palaeoclimate Reconstruction Based On Clay Minerals Assemblage From Preluca Tiganului (Gutai Mountains, Romania), Lucreția Ghergari, Bogdan P. Onac
Studia UBB Geologia
Several core samples were extracted from the overgrown crater lake of Preluca Tiganului, NW Romania. The overall lithology and the mineral assemblages (mostly clay) described from different levels within these cores, suggest three main periods having humid or dry conditions. Based on these findings, palaeoclimate conditions can be reconstructed the over the time period spanning 15,000 to 13,500 cal. years BP.
Structural Researches In The Eastern Carpathians (In Romanian), I. Balintoni, U. Baier
Structural Researches In The Eastern Carpathians (In Romanian), I. Balintoni, U. Baier
Studia UBB Geologia
Structural Researches in the Eastern Carpathians. The Alpine mesoscopic lineations in the East Carpathians metamorphics, are NW-SE orientated. A few lineations, nearly E-W orientated, could be proved as pre-Alpine in age. Within the Ditrău Massif, is conserved a pre-Alpine attitude of foliations, as frozen magmatic flow, along the metamorphic pre-Triassic fabric. The lineation directions were conditioned by the Cretaceous-Tertiary contractional elimination of the External Carpathian Flysch Basin.
In Memorium, Vlad Codrea, Ioan Bucur, Constantin Ianoliu, Iustinian Petrescu
In Memorium, Vlad Codrea, Ioan Bucur, Constantin Ianoliu, Iustinian Petrescu
Studia UBB Geologia
No abstract provided.
Evolution De La Biosphère Et Événements Géologiques, Ioan I. Bucur
Evolution De La Biosphère Et Événements Géologiques, Ioan I. Bucur
Studia UBB Geologia
No abstract provided.
Considerations Sur La Limite Dacien-Romanien, Constantin Enache, Ion PăTruțoiu
Considerations Sur La Limite Dacien-Romanien, Constantin Enache, Ion PăTruțoiu
Studia UBB Geologia
An approach to the Dacian-Romanian limit. The aim of this study is to emphasize the idea’s evolution related to the Dacian-Romanian limit in Oltenia, and to emphasize some conclusions on this problem. The magnetostratigraphic studies shown the presence of the Gauss-Gilbert limit between the XIth and XIIth coal seams. This limit can be paralelised to the Dacian-Romanian boundary. The Cochiti event corresponds to seams VIIth and VIIIth, and can be designated as the boundary between the Parscovian and Siensian.
Lithostratigraphy Of The Miocene Deposits In The Eastern Part Of Borod Basin (North-Western Of Romania), Mirela Popa
Lithostratigraphy Of The Miocene Deposits In The Eastern Part Of Borod Basin (North-Western Of Romania), Mirela Popa
Studia UBB Geologia
The paper presents the lithostratigraphic units of the Miocene deposits in the eastern part of Borod Basin. Four lithostratigraphic units were defined (Borod Formation, Cornitel Formation - including Borozel Member - and Beznea Formation) according to the recommendations of the International Stratigraphic Guide.
Badenian Mollusks From Rachitova (Hateg Depression, Romania), Mirela Popa, Constantin Ianoliu
Badenian Mollusks From Rachitova (Hateg Depression, Romania), Mirela Popa, Constantin Ianoliu
Studia UBB Geologia
The paper presents in systematic order the mollusk assemblage collected from one outcrop on Lacului Brook (left tributary to Răchitova Valley). There were identified 33 taxa (22 gastropods, 9 bivalves and 2 scaphopods) and the whole assemblage is characteristic to the Badenian deposits in the studied area.
The Presence Of Lower Miocene (Eggenburgian) In Borehole 575 Cetea (East Of Borod Basin, Nw Romania), I. Petrescu, M. Popa, N. Bican-Brișan
The Presence Of Lower Miocene (Eggenburgian) In Borehole 575 Cetea (East Of Borod Basin, Nw Romania), I. Petrescu, M. Popa, N. Bican-Brișan
Studia UBB Geologia
The microfloral record evidenced in borehole 575 Cetea is very rich, consisting of 114 taxa, some of them being new species for the Tertiary of Romania. At the same time, it includes species of Eggenburgian age of the host rocks. The whole microflora assemblage suggests a forest-type vegetation developed in a warm, subtropical climate, characteristic for the Eggenburgian age of the Early Miocene. The Eggenburgian of Romania shows the same microfloral features as the Eggenburgian of Central Paratethys.
Upper Jurassic - Lower Cretaceous Deposits In The South-Western Part Of Padurea Craiului. Formal Lithostratigraphic Units, Ioan Cociuba
Upper Jurassic - Lower Cretaceous Deposits In The South-Western Part Of Padurea Craiului. Formal Lithostratigraphic Units, Ioan Cociuba
Studia UBB Geologia
The paper describes the Upper Jurassic – Lower Cretaceous deposits of the Bihor Unit from Pădurea Craiului Mountains, according to the International Stratigraphic Guide. All the previously described formations are included; besides, new formations are defined in case of deposits which were not previously described in agreement with this code. The Upper Jurassic units here described are Vad, Cornet, Aştileu, and Albioara Formations (the last one divided into Secătura and Valea Cuţilor Members). The corresponding Lower Cretaceous units are: Blid Formation (divided into Dobreşti and Coposeni Members), Ecleja Formation (partly divided into Gugu and Valea Bobdei Members), Valea Măgurii, and …
New Data Concerning The Age Of Mesozoic Limestone From Scarisoara (Bihor Mountains), Ioan I. Bucur, Bogdan P. Onac
New Data Concerning The Age Of Mesozoic Limestone From Scarisoara (Bihor Mountains), Ioan I. Bucur, Bogdan P. Onac
Studia UBB Geologia
Microfacies and micropalaeontologic studies on some limestone samples collected within the Scărişoara Glacier Cave are presented. The investigation pointed out that the age of the limestone around Scărişoara Cave is of Upper Jurassic (Kimmeridgian) age and not Triassic as it was considered in most of the studies.