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2012

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Articles 361 - 390 of 988

Full-Text Articles in Earth Sciences

Cenozoic Tectonic Evolution Of The Central Wassuk Range, Western Nevada, Usa, Benjamin E. Surpless Mar 2012

Cenozoic Tectonic Evolution Of The Central Wassuk Range, Western Nevada, Usa, Benjamin E. Surpless

Earth and Environmental Geosciences Faculty Research

The central Wassuk Range of western Nevada is ideally located to investigate the interplay of Basin and Range extension and Walker Lane dextral deformation on the margin of the Basin and Range province. To elucidate the Cenozoic evolution of the range, the author conducted geologic mapping, structural data collection and analysis, geochemical analysis of igneous lithologies, and geochronology. This research delineates a three-stage deformational history for the range. A ~15 Ma pulse of ENE-WSW directed extension at high strain rates (~8.7 Ma) was immediately preceded by the eruption of andesites and was accommodated by high-angle, closely spaced (1-2 km), east-dipping …

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Proceedings Of The European Society For Isotope Research - Esir Ix, Editor: Bogdan P. Onac, Editor: Ioan I. Bucur Mar 2012

Proceedings Of The European Society For Isotope Research - Esir Ix, Editor: Bogdan P. Onac, Editor: Ioan I. Bucur

Studia UBB Geologia

No abstract provided.

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03 Characteristics Of The Quasi-16 Day Wave In The Mesosphere And Lower Thermosphere (Mlt): A Review Over An Equatorial Station Thumba (8.50n, 76.50e), Siddarth Shankar Das Mar 2012

03 Characteristics Of The Quasi-16 Day Wave In The Mesosphere And Lower Thermosphere (Mlt): A Review Over An Equatorial Station Thumba (8.50n, 76.50e), Siddarth Shankar Das

Modern Climatology

To understand the climate variability and weather prediction in the Earth’s atmosphere, measurements of winds, temperature and wave activities are very crucial. The Earth’s atmosphere is believed to act as a source and sink for the waves of a broader spectrum with periods from few seconds to years. Generally, the Earth’s atmosphere is stably stratified except the planetary boundary layer and thus makes a reasonable assumption for the presence of atmospheric waves. A barotropic atmosphere in a resting basic state is able to support these spectra of waves. These waves move diagonally upward or downward and horizontally. The mean zonal …

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In Memoriam - Dr. De̒Nes Ja̒Nossy, László Kordos Mar 2012

In Memoriam - Dr. De̒Nes Ja̒Nossy, László Kordos

Studia UBB Geologia

No abstract provided.

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Announcements, Books &. Events Mar 2012

Announcements, Books &. Events

Studia UBB Geologia

No abstract provided.

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Climate Change: The Karst Record (4th Ed.), Kali Pace-Graczyk Mar 2012

Climate Change: The Karst Record (4th Ed.), Kali Pace-Graczyk

Studia UBB Geologia

No abstract provided.

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Holivar2006 Open Science Meeting: Natural Climate Variability And Global Warming, Aurel Pers̡Oiu Mar 2012

Holivar2006 Open Science Meeting: Natural Climate Variability And Global Warming, Aurel Pers̡Oiu

Studia UBB Geologia

No abstract provided.

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Nano, Bio And Planetary Sciences: The 19th Meeting Of The International Mineralogical Association, Corina Ionescu, Volker Hoeck Mar 2012

Nano, Bio And Planetary Sciences: The 19th Meeting Of The International Mineralogical Association, Corina Ionescu, Volker Hoeck

Studia UBB Geologia

No abstract provided.

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The Xviiith Congress Of The Carpathian-Balkan Geological Association, Volker Hoeck, Corina Ionescu Mar 2012

The Xviiith Congress Of The Carpathian-Balkan Geological Association, Volker Hoeck, Corina Ionescu

Studia UBB Geologia

No abstract provided.

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Geological Characteristics Of Underground Gas Storages From Romania, Isabela Falk Mar 2012

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 …

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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 Mar 2012

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 …

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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 Mar 2012

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 …

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New Data On The Western Transylvanides Along The Ampoi Valley (Southern Apuseni Mts., Romania), Erika Suciu-Krausz, Ramona BăLc, Florin Borbei Mar 2012

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.

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On The Hybodus (Euselachii) From The Early Jurassic Of Anina (Caras Severin District, Romania), Emanuel Paul Dica, Vlad Codrea Mar 2012

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.

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Zeolitic Volcanic Tuffs From Macicas (Cluj County), Natural Raw Materials Used For Nh4+ Removal From Wastewaters, Horea Bedelean, Maria Stanca, Andrada MăIcăNeanu, Silvia Burcă Mar 2012

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 …

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Clay Mineral Association In The Salt Formation Of The Transylvanian Basin And Its Paleoenvironmental Significance, Nicoleta Bican-Bris̡An, Alexandru Hosu Mar 2012

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 …

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A Novel Morphological Type Of Siderite In The Jamesonite Paragenesis From Herja (Maramures County, Romania), Virgil Ghiurcă, Dana Pop Mar 2012

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, …

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Microbialitic Structures In The Sarmatian Carbonate Deposits From Simleu Basin, Hyam Daoud, Ioan I. Bucur, CăLin Bruchental Mar 2012

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 …

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The Impact Of Human Activities In The Gutaiului Mountains, Romania, Angelica Feurdean, Ciprian Astalos Mar 2012

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 …

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Quaternary Dating Methods; A Geologic Time Scale 2004; Atlas Of Paleogene Cosmopolitan Deep-Water Agglutinated Foraminifera, Bogdan P. Onac, Sorin Filipescu Mar 2012

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.

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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 Mar 2012

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 …

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Telephragmoxylon Transsylvanicum Sp. Nov. (Cheirolepidiaceae), In Latest Cretaceous From Oarda-Lancram And Rapa Rosie, Romania, Eugenia Iamandei, StăNilă Iamandei, Vlad Codrea Mar 2012

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.

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The Post-Late Pontian Paleogeographic Evolution Of The South Harghita Mountains Area And The Adjacent Basins, Attila László Mar 2012

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.

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Upper Cretaceous - Lowermost Miocene Lithostratigraphic Units Exposed In Alba Iulia-Sebes-Vintu De Jos Area (Sw Transylvanian Basin), Vlad Codrea, Emanuel Paul Dica Mar 2012

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 …

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Cryptobiotic Foraminifera From The Paleocene Kambühel Formation (Northern Calcareous Alps, Austria), Felix Schlagintweit Mar 2012

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 …

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Tracking Lateglacial And Early Holocene Environmental Change: A Palaeolimnological Study Of Sediment At Preluca Tiganului, Nw Romania, Angelica Feurdean Mar 2012

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 …

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Mafic Alkaline Magmatism In The East Tintic Mountains, West-Central Utah: Implications For A Late Oligocene Transition From Subduction To Extension, Tara Laine Allen Mar 2012

Mafic Alkaline Magmatism In The East Tintic Mountains, West-Central Utah: Implications For A Late Oligocene Transition From Subduction To Extension, Tara Laine Allen

Theses and Dissertations

Voluminous Eocene to Oligocene intermediate to silicic volcanic rocks related to subduction erupted throughout the Great Basin and were supplanted by bimodal eruptions of basalt and rhyolite related to extension in the Miocene. Locally, in the northern East Tintic Mountains of central Utah, this important transition is marked by a distinctive package of mafic alkaline magmas that reveal important details about the nature of this fundamental change. A late Oligocene anorthoclase-bearing shoshonite lava in the Boulter Peak quadrangle contains megacrysts of anorthoclase, with phenocrysts of olivine, clinopyroxene, magnesiohastingsite, magnetite, and apatite. The anorthoclase grains occur as glomerocrysts with irregular, resorbed …

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Bivalvia Neogenica (Nuculacea-Unionacea), Carmen Chira Mar 2012

Bivalvia Neogenica (Nuculacea-Unionacea), Carmen Chira

Studia UBB Geologia

No abstract provided.

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International Symposium On Earth System Sciences (Istambul-Turkey), Vlad Codrea, Ovidiu Barbu Mar 2012

International Symposium On Earth System Sciences (Istambul-Turkey), Vlad Codrea, Ovidiu Barbu

Studia UBB Geologia

No abstract provided.

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New Approach On The Saiga Antelopes (Saiga Tatarica/Borealis; Bovidae) From The Late Pleistocene And Holocene Of Crimea (Se Ukraine), Matei M. Vremir Mar 2012

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.

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