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Articles 1 - 30 of 211
Full-Text Articles in Physical Sciences and Mathematics
New Insights Into Troglotella Incrustans Wernli & Fookes, 1992, A Fascinating Upper Jurassic-Upper Cretaceous Foraminifer, Felix Schlagintweit
New Insights Into Troglotella Incrustans Wernli & Fookes, 1992, A Fascinating Upper Jurassic-Upper Cretaceous Foraminifer, Felix Schlagintweit
Studia UBB Geologia
New data about the highly variable test morphology of the benthic foraminifer Troglotella incrustans WERNLI & FOOKES (Oxfordian-Lower Cenomanian) are presented, permitting an emended species/genus diagnosis. This concerns mainly the existence of a large final chamber with fistulose extensions that may follow the uniserial or the irregular-branching test part. The way of life of T. incrustans (cryptoendolithic vs. euendolithic) is discussed against the background of different existing models in the literature. The study is based on material (thin-sections and provided photographs) mainly from the Upper Jurassic of Austria, Italy, Romania, Ukraine, and also the type-locality of France.
Origin, Evolutionary Classification, And Biostratigraphic Significance Of The Late Cretaceous Planktic Foraminiferal Directional Lineage Bollitruncana O.A. Korchagin, 2001, Marius Dan Georgescu
Origin, Evolutionary Classification, And Biostratigraphic Significance Of The Late Cretaceous Planktic Foraminiferal Directional Lineage Bollitruncana O.A. Korchagin, 2001, Marius Dan Georgescu
Studia UBB Geologia
Taxonomic revision of the genus Bollitruncana O.A. Korchagin, 2001 shows that it accommodates a directional lineage, which consists of two species: B. carpathica (Scheibnerová, 1963) and B. posthelvetica (Hanzliková, 1963). Bollitruncana directional lineage is restricted to Turonian. A new planktic foraminiferal biozone is recognized in the Turonian, namely the Bollitruncana carpathica Biozone.
Proceedings Of The European Society For Isotope Research - Esir Ix, Editor: Bogdan P. Onac, Editor: Ioan I. Bucur
Proceedings Of The European Society For Isotope Research - Esir Ix, Editor: Bogdan P. Onac, Editor: Ioan I. Bucur
Studia UBB Geologia
No abstract provided.
In Memoriam - Dr. De̒Nes Ja̒Nossy, László Kordos
In Memoriam - Dr. De̒Nes Ja̒Nossy, László Kordos
Studia UBB Geologia
No abstract provided.
Announcements, Books &. Events
Climate Change: The Karst Record (4th Ed.), Kali Pace-Graczyk
Climate Change: The Karst Record (4th Ed.), Kali Pace-Graczyk
Studia UBB Geologia
No abstract provided.
Holivar2006 Open Science Meeting: Natural Climate Variability And Global Warming, Aurel Pers̡Oiu
Holivar2006 Open Science Meeting: Natural Climate Variability And Global Warming, Aurel Pers̡Oiu
Studia UBB Geologia
No abstract provided.
Nano, Bio And Planetary Sciences: The 19th Meeting Of The International Mineralogical Association, Corina Ionescu, Volker Hoeck
Nano, Bio And Planetary Sciences: The 19th Meeting Of The International Mineralogical Association, Corina Ionescu, Volker Hoeck
Studia UBB Geologia
No abstract provided.
The Xviiith Congress Of The Carpathian-Balkan Geological Association, Volker Hoeck, Corina Ionescu
The Xviiith Congress Of The Carpathian-Balkan Geological Association, Volker Hoeck, Corina Ionescu
Studia UBB Geologia
No abstract provided.
Geological Characteristics Of Underground Gas Storages From Romania, Isabela Falk
Geological Characteristics Of Underground Gas Storages From Romania, Isabela Falk
Studia UBB Geologia
Underground gas storages from Romania are located in south Romania (in the Moesian Platform) and in Transylvanian Basin. They are converted from depleted gas reservoirs. Those from south have bigger capacity because the reservoirs are thick and stratiform, consisting of unconsolidated sand, with high porosity and permeability. The Transylvanian storages have smaller capacity because the layers are thinner, consisting of interbedded sandstones, silts and marls, with many lithological and facies variations, lower porosities and permeabilities. Geology of the reservoir has to be well known before constructing a deposit. Most important parameters are: depth of the reservoir, thickness, porosity, permeability, pore …
A Few Single Crystal Zircon Ages From The Padeş Suite Orthogneisses (Southern Carpathians, Romania), Ioan Balintoni, Constantin Balica, Monica Clivet̡I, Li-Qiu Li, Horst Peter Hann, Fukun Chen
A Few Single Crystal Zircon Ages From The Padeş Suite Orthogneisses (Southern Carpathians, Romania), Ioan Balintoni, Constantin Balica, Monica Clivet̡I, Li-Qiu Li, Horst Peter Hann, Fukun Chen
Studia UBB Geologia
The Padeş suite from the Poiana Ruscă Mountains is a component of the Padeş Paleozoic terrane. The Padeş terrane evolved as an island arc between the Cadomian Sebeş-Lotru and Făgăraş terranes, the main parts of the Getic crystalline in the Southern Carpathians. Evaporated single zircon grains offered 394±20 Ma, 546±20 Ma, 655±19 Ma, 1305±17 Ma, and 1538±17 Ma ages. The 394 Ma age has been interpreted as an early Variscan collision age, 546 Ma as the protolith age and the other ages as signifying Cadomian and Saharan detrital zircons. Similar to the terranes in the Apuseni Mountains, the Padeş terrane …
New U/Pb And Pb/Pb Zircon Ages From The Biharia Terrane Rocks, Apuseni Mountains, Romania, Ioan Balintoni, Constantin Balica, Monica Clivet̡I, Li-Qiu Li, Horst Peter Hann, Fukun Chen, Volker Schuller
New U/Pb And Pb/Pb Zircon Ages From The Biharia Terrane Rocks, Apuseni Mountains, Romania, Ioan Balintoni, Constantin Balica, Monica Clivet̡I, Li-Qiu Li, Horst Peter Hann, Fukun Chen, Volker Schuller
Studia UBB Geologia
The Biharia sequence from the Apuseni Mountains is a component of the Biharia Paleozoic terrane. The Biharia terrane probably evolved as an island arc between the Cadomian Someş and Baia de Arieş terranes. A gneissic metagranodiorite associated with metabasites from the Valea Ierţii creek, was sampled for U/Pb and Pb/Pb zircon age determination. The zircons extracted out of the sampled rock were subjected both to dilution and evaporation methods. Dilution method offered Concordia intercepts at 227±23 Ma, 312±13 Ma, 465.7+8.4/-8.0 Ma, 703±21 Ma and 1604±45 Ma. Evaporated zircon grains gave 450±20 Ma and 543±17 Ma. The 227±23 Ma age and …
New Data On The Western Transylvanides Along The Ampoi Valley (Southern Apuseni Mts., Romania), Erika Suciu-Krausz, Ramona BăLc, Florin Borbei
New Data On The Western Transylvanides Along The Ampoi Valley (Southern Apuseni Mts., Romania), Erika Suciu-Krausz, Ramona BăLc, Florin Borbei
Studia UBB Geologia
In order to clarify some of the issues regarding the mineralogical content and the source area of the Cretaceous deposits from Ampoi Valley basin (Southern Apuseni Mountains) fourteen lithologic logs were drawn from the Ampoi Valley both side tributaries (Slatinii, Ruzi, Vâltori, Valea lui Paul, Feneş, Călineasa, Fierului Brook, Bobului, Satului, Tăuţi, Galaţi, Presaca Ampoiului, Valea Mică and Valea Mare brooks). The main sedimentary rock types were identified (conglomerates, wacke and lithic sandstones, clays, and marls). The sandstones were classified according to the ternary diagrams. Their petrographic features revealed both a magmatic and a metamorphic source area for them.
On The Hybodus (Euselachii) From The Early Jurassic Of Anina (Caras Severin District, Romania), Emanuel Paul Dica, Vlad Codrea
On The Hybodus (Euselachii) From The Early Jurassic Of Anina (Caras Severin District, Romania), Emanuel Paul Dica, Vlad Codrea
Studia UBB Geologia
A new Hybodus site from Romania is located at Anina, in the Pliensbachian – Middle Toarcian succession from Ponor quarry (Caraş-Severin district). The paper refers to a short description of the Hybodus teeth recently collected, followed by some considerations on hybodonts phylogeny and palaeoecology.
Zeolitic Volcanic Tuffs From Macicas (Cluj County), Natural Raw Materials Used For Nh4+ Removal From Wastewaters, Horea Bedelean, Maria Stanca, Andrada MăIcăNeanu, Silvia Burcă
Zeolitic Volcanic Tuffs From Macicas (Cluj County), Natural Raw Materials Used For Nh4+ Removal From Wastewaters, Horea Bedelean, Maria Stanca, Andrada MăIcăNeanu, Silvia Burcă
Studia UBB Geologia
Volcanic tuffs out cropping in Măcicaş area (Cluj County) have been investigated and tested for their ammonium removal capacity. The zeolitic volcanic tuffs from Măcicaş are mainly represented by vitric and vitric crystal tuffs. In this region, significant amounts of volcanic glass in the pyroclastic sequence have been replaced by zeolites (between 50-80 %). The main zeolite species identified in volcanic tuffs from Măcicaş is clinoptilolite and subordinately mordenite. The zeolitic tuff samples considered in zeolitic sodium form (labeled M1-Na and M2-Na) are tested in ammonium removal experiments. The ammonium ions were completely removed from 0.0716g/dm3 NH4+ solution onto 10g …
Clay Mineral Association In The Salt Formation Of The Transylvanian Basin And Its Paleoenvironmental Significance, Nicoleta Bican-Bris̡An, Alexandru Hosu
Clay Mineral Association In The Salt Formation Of The Transylvanian Basin And Its Paleoenvironmental Significance, Nicoleta Bican-Bris̡An, Alexandru Hosu
Studia UBB Geologia
The investigated clay fraction was separated from salt samples recovered from three boreholes located in the Praid salt deposit area. For comparison, samples collected from Turda deposit (Franz Josef adit, the Rudolf and Ghizele chambers) and from the salt massif from Sărăţel were also analyzed. The qualitative investigations evidenced a clay minerals association dominated by illite and chlorite accompanied by subordinate amounts of kaolinite, smectite, fibrous clays (sepiolite, palygorskite), and in minor amounts, by 14/14 chlorite/vermiculite and chlorite/smectite interstratifications. A quantitative evaluation (%) including a standard graphical representation was performed only for the borehole samples (Praid), according to the vertical …
A Novel Morphological Type Of Siderite In The Jamesonite Paragenesis From Herja (Maramures County, Romania), Virgil Ghiurcă, Dana Pop
A Novel Morphological Type Of Siderite In The Jamesonite Paragenesis From Herja (Maramures County, Romania), Virgil Ghiurcă, Dana Pop
Studia UBB Geologia
The loose jamesonite felted masses found in several vein-type Miocene ore deposits in Romania, at Herja in particular, host a very rich and peculiar mineral assemblage. This study concerns a novel morphological type of loose siderite crystals identified in this paragenesis. Additional to their macroscopic and microscopic investigation, powder X-ray diffraction (XRPD) analysis was carried out. Based on XRPD patterns, some pseudoxehagonal prisms, up to 10 mm in size, black to dark brown in color, with rugged surfaces and microscopic mosaic-like structures, were proved to be siderite. The described morphological type of siderite represents a novelty for Herja ore deposits, …
Microbialitic Structures In The Sarmatian Carbonate Deposits From Simleu Basin, Hyam Daoud, Ioan I. Bucur, CăLin Bruchental
Microbialitic Structures In The Sarmatian Carbonate Deposits From Simleu Basin, Hyam Daoud, Ioan I. Bucur, CăLin Bruchental
Studia UBB Geologia
The Sarmatian deposits from the Şimleu basin are developed in two facies: terrigenous and calcareous. An attempt to distinguish the main types of Sarmatian limestone microfacies was made by Bucur et al. (1992). The present study provides more detail of the sedimentary facies and fabrics of these limestones, emphasizing the essential contribution of microbialites to their formation. The following types of microbialite and microbial structure were found: (1) thrombolites with clotted fabric and fenestral structures; (2) microbial crusts on bioclasts; (3) peloidal microbialites (4) agglutinated microbialites; (5) stromatolites and laminoid-fenestral structures. All these structures played an important role in the …
The Impact Of Human Activities In The Gutaiului Mountains, Romania, Angelica Feurdean, Ciprian Astalos
The Impact Of Human Activities In The Gutaiului Mountains, Romania, Angelica Feurdean, Ciprian Astalos
Studia UBB Geologia
The examination of pollen and charcoal from the Gutâiului Mountains in northwestern Romania and the archaeological evidence from surroundings provides some information on how past human activities have changed the vegetation in this region. The first evidence of potential human influence upon the woodlands is manifested by fire clearance recorded at approximately 7900 cal. yr BP coinciding with the Early Neolithic. The charcoal peaks at ca. 5750, 3300, 2700, 1500, 1000 cal. yr BP, and during the last 300 years are associated with episodes of decline of main woodland constituents (Ulmus, Tilia, Fraxinus, and Corylus), and the expansion of fire-precursors …
Quaternary Dating Methods; A Geologic Time Scale 2004; Atlas Of Paleogene Cosmopolitan Deep-Water Agglutinated Foraminifera, Bogdan P. Onac, Sorin Filipescu
Quaternary Dating Methods; A Geologic Time Scale 2004; Atlas Of Paleogene Cosmopolitan Deep-Water Agglutinated Foraminifera, Bogdan P. Onac, Sorin Filipescu
Studia UBB Geologia
No abstract provided.
The Olenekian Carbonates Of The Bucovinian Nappe (The Central Sector Of The Haghimas Syncline, Eastern Carpathians). Lithology And Microfacies, Daniela Alexandra Popescu, Liviu Gheorghe Popescu
The Olenekian Carbonates Of The Bucovinian Nappe (The Central Sector Of The Haghimas Syncline, Eastern Carpathians). Lithology And Microfacies, Daniela Alexandra Popescu, Liviu Gheorghe Popescu
Studia UBB Geologia
Early Triassic carbonate outcrops were studied in the central sector of the Hăghimaş Syncline with regard to stratigraphy, microfacies and facies interpretation.This is the first microfacies study of these deposits. Early Triassic carbonates in the Hăghimaş Syncline are represented by two stratified successions: limestones and dolomites. The limestones overlie very rarely the detritic basal deposits (Induan) which marks the beginning of the alpine transgression. The stratified dolomites underlie frequently the Early Anisian massive dolomites. The contact between the stratified limestones and stratified dolomites is only exposed on Calu brook outcrop (the western flank of the Hăghimaş Syncline). The age of …
Telephragmoxylon Transsylvanicum Sp. Nov. (Cheirolepidiaceae), In Latest Cretaceous From Oarda-Lancram And Rapa Rosie, Romania, Eugenia Iamandei, StăNilă Iamandei, Vlad Codrea
Telephragmoxylon Transsylvanicum Sp. Nov. (Cheirolepidiaceae), In Latest Cretaceous From Oarda-Lancram And Rapa Rosie, Romania, Eugenia Iamandei, StăNilă Iamandei, Vlad Codrea
Studia UBB Geologia
Telephragmoxylon transsylvanicum, a new morphospecies of cheirolepidiaceous conifer wood, typical for the Latest Cretaceous from Sebeş Valley in Oarda-Sebeş sector (Alba district), coeval with the latest dinosaurs, is described. Geological and palaeobotanical settings for South Apuseni Mts. area are sketched and paleoclimatical remarks are suggested.
The Post-Late Pontian Paleogeographic Evolution Of The South Harghita Mountains Area And The Adjacent Basins, Attila László
The Post-Late Pontian Paleogeographic Evolution Of The South Harghita Mountains Area And The Adjacent Basins, Attila László
Studia UBB Geologia
The paper concerns the stages of evolution of the South Harghita area and of the adjacent mountainous basins. The focus is set on specific geological events and on their consequences upon the paleogeographical modeling. Based on field observations and on previous studies, the Pliocene-Pleistocene geological events from the Baraolt and Lower Ciuc basins, the Tuşnad – Malnaş Channel and Sfântu Gheorghe gulf were synchronised with those from the South Harghita volcanic area.
Upper Cretaceous - Lowermost Miocene Lithostratigraphic Units Exposed In Alba Iulia-Sebes-Vintu De Jos Area (Sw Transylvanian Basin), Vlad Codrea, Emanuel Paul Dica
Upper Cretaceous - Lowermost Miocene Lithostratigraphic Units Exposed In Alba Iulia-Sebes-Vintu De Jos Area (Sw Transylvanian Basin), Vlad Codrea, Emanuel Paul Dica
Studia UBB Geologia
A main area where several Uppermost Cretaceous-Lower Cenozoic formations are exposed in the SW Transylvanian Depression is the region outlined by the localities Alba Iulia, Sebeş, Vinţu de Jos (Alba district). In Maastrichtian, continental formations belonging to the post-Laramian cover began their deposition. In Early Cenozoic, the dominance of continental formations continued, but some short marine transgress events occur too, with specific marine and brackish deposits interbedded into the continental successions. Some new lithostratigraphic units are proposed: Vurpăr (Maastrichtian), Şard (Maastrichtian-Late Eocene), Bărăbanţ (Oligocene) and Sântimbru (Aquitanian) formations. Ighiu Fm. (Late Eocene-Early Oligocene) is also reinterpreted. This region is an …
Cryptobiotic Foraminifera From The Paleocene Kambühel Formation (Northern Calcareous Alps, Austria), Felix Schlagintweit
Cryptobiotic Foraminifera From The Paleocene Kambühel Formation (Northern Calcareous Alps, Austria), Felix Schlagintweit
Studia UBB Geologia
Cryptobiotic foraminifera are described from Paleocene shallow-water limestones of the Kambühel Formation (“Kambühelkalk”) of the south-eastern part of the Northern Calcareous Alps/Austria. They have been discovered within cavities occurring in the nodular thalli of the “solenoporacean” alga Parachaetetes asvapatii Pia, 1936. The foraminifera of uncertain generic status show an irregular planspiral coiling and thin walls. It is assumed that these forms were actively boring, not colonizing an excavation made by another organism. Whether these borings were excavated during the life-time of the alga or post-mortem, however, is uncertain. The micritic Parachaetetes bafflestones containing the described foraminifera were deposited in an …
Tracking Lateglacial And Early Holocene Environmental Change: A Palaeolimnological Study Of Sediment At Preluca Tiganului, Nw Romania, Angelica Feurdean
Tracking Lateglacial And Early Holocene Environmental Change: A Palaeolimnological Study Of Sediment At Preluca Tiganului, Nw Romania, Angelica Feurdean
Studia UBB Geologia
Palaeoecological, palaeohydrological, and paleoenvironmental reconstruction of the Late Glacial and the early Holocene have been performed from sediment accumulated in a small former crater lake, in the GutâI Mountains, NW Romania. Pollen, lithology, mineral magnetic, and loss-on-ignition analyses in conjunction to radiocarbon dating have been use for this purpose. The data indicates that during the Late Glacial period, vegetation dynamics were likely driven by climatic fluctuations. The climate events during the Late Glacial are well mirrored in local vegetation assemblage development, and past lake level fluctuations. These climatic events recorded in south-eastern Europe, are well correlated with the climate events …
Bivalvia Neogenica (Nuculacea-Unionacea), Carmen Chira
Bivalvia Neogenica (Nuculacea-Unionacea), Carmen Chira
Studia UBB Geologia
No abstract provided.
International Symposium On Earth System Sciences (Istambul-Turkey), Vlad Codrea, Ovidiu Barbu
International Symposium On Earth System Sciences (Istambul-Turkey), Vlad Codrea, Ovidiu Barbu
Studia UBB Geologia
No abstract provided.
New Approach On The Saiga Antelopes (Saiga Tatarica/Borealis; Bovidae) From The Late Pleistocene And Holocene Of Crimea (Se Ukraine), Matei M. Vremir
New Approach On The Saiga Antelopes (Saiga Tatarica/Borealis; Bovidae) From The Late Pleistocene And Holocene Of Crimea (Se Ukraine), Matei M. Vremir
Studia UBB Geologia
The present paper is a short review of the knowledge regarding the fossil saiga antelopes from the Pleistocene and Holocene of Crimea, in the context of the general taxonomic and phylogenetic problems in question. According to the newly discovered paleontological material from the Crimean Mountain cave-sites, a new point of view is considered.
New Contribution In The Study Of The Pontian Flora From Batoti (Mehedinti County), Florina Diaconu
New Contribution In The Study Of The Pontian Flora From Batoti (Mehedinti County), Florina Diaconu
Studia UBB Geologia
In Early Pontian deposits from Batoţi (Mehedinţi county) has been described a macroflora formed, until now, of 35 taxa, many other being in course of determination. By this paper the floristic epitome is filled with other 10 taxa: Pinus sp. binae, Magnolia sp. aff. M. acuminata Linné, Sassafras subtriloba (Konno) Tanai et Onoe, Ostrya sp. aff. O. virginiana (Miller) C. Koch, Castanea gigas (Goepp.) Iljinsk., Quercus cf. meuhlenbergii Engelmann, Juglans acuminata Al. Braun, Acer tricuspidatum Bronn, A. cf. campestre L. and Berchemia multinervis (Al. Br.) Heer. The stage of knowledge of the Pontian flora from Batoţi contains 45 taxa. Trough …