Littérature scientifique sur le sujet « GEO/08 »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « GEO/08 ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "GEO/08"

1

Armasu, Sebastian, Bryan McCauley, Iftikhar Kullo, Hugues Sicotte, Jyotishman Pathak, Christopher Chute, Omri Gottesman et al. « Identification of unique venous thromboembolism-susceptibility variants in African-Americans ». Thrombosis and Haemostasis 117, no 04 (2017) : 758–68. http://dx.doi.org/10.1160/th16-08-0652.

Texte intégral
Résumé :
SummaryTo identify novel single nucleotide polymorphisms (SNPs) associated with venous thromboembolism (VTE) in African-Americans (AAs), we performed a genome-wide association study (GWAS) of VTE in AAs using the Electronic Medical Records and Genomics (eMERGE) Network, comprised of seven sites each with DNA biobanks (total ~39,200 unique DNA samples) with genome-wide SNP data (imputed to 1000 Genomes Project cosmopolitan reference panel) and linked to electronic health records (EHRs). Using a validated EHR-driven phenotype extraction algorithm, we identified VTE cases and controls and tested for an association between each SNP and VTE using unconditional logistic regression, adjusted for age, sex, stroke, site-platform combination and sickle cell risk genotype. Among 393 AA VTE cases and 4,941 AA controls, three intragenic SNPs reached genome-wide significance: LEMD3 rs138916004 (OR=3.2; p=1.3E-08), LY86 rs3804476 (OR=1.8; p=2E-08) and LOC100130298 rs142143628 (OR=4.5; p=4.4E-08); all three SNPs validated using internal cross-validation, parametric bootstrap and meta-analysis methods. LEMD3 rs138916004 and LOC100130298 rs142143628 are only present in Africans (1000G data). LEMD3 showed a significant differential expression in both NCBI Gene Expression Omnibus (GEO) and the Mayo Clinic gene expression data, LOC100130298 showed a significant differential expression only in the GEO expression data, and LY86 showed a significant differential expression only in the Mayo expression data. LEMD3 encodes for an antagonist of TGF-β-induced cell proliferation arrest. LY86 encodes for MD-1 which down-regulates the pro-inflammatory response to lipopolysaccharide; LY86 variation was previously associated with VTE in white women; LOC100130298 is a non-coding RNA gene with unknown regulatory activity in gene expression and epigenetics.Supplementary Material to this article is available online at www.thrombosis-online.com.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Kutz, William. « Municipalizing geo-economic statecraft : Crisis and transition in Europe ». Environment and Planning A : Economy and Space 49, no 6 (10 février 2017) : 1224–46. http://dx.doi.org/10.1177/0308518x17691969.

Texte intégral
Résumé :
This article investigates how geographical capital switching, precipitated by the 2007–08 economic crisis, has altered the strategic territorial organization of European city-regions. The dislocation of capital accumulation to (emerging) foreign markets has undermined the purported capacity for city-regions to regulate the contradictions of uneven development in the European Union. The argument is that, in southern Spain, city-regions have increasingly responded to the crisis by shifting spatial development away from conventional neoliberal locational initiatives towards an assertion of geo-economic statecraft at the municipal level. Drawing primarily upon the case study of Málaga, Spain the article contributes to theories of new state space in three ways. First, geo-economic statecraft is both embedded within, and is a response to, the historically inherited geographies of neoliberal urbanization. Second, intensified growth imperatives amid recessionary decline belie the importance of gatekeeping activities that municipalize political control over cross-border investment flows that parallel more traditional, selective targeting of state territory. Third, the strategic externalization of economic space has helped to reshape the variegated cartographies of local state territory and sovereignty between the EU and non-member states. Together, these dynamics situate the spatial regulation of urban crises as central to explaining the patterns and processes of European territoriality in the 21st-century.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Ahmeti, Hysen, Ajet Ahmeti et Ragip Behrami. « The Impact of Coal Quality on Reduction of Environmental Pollution Researched Through Statistical Analysis ». Civil Engineering Journal 8, no 8 (1 août 2022) : 1596–605. http://dx.doi.org/10.28991/cej-2022-08-08-05.

Texte intégral
Résumé :
Today, the region in general but also Kosovo faces a lack of electricity on the one hand and environmental pollution on the other hand from existing power plants where electricity is produced for the community in general in thermo-plants Kosovo A and Kosovo B. The purpose and importance of this paper is that for the samples taken through the layers (floors) of coal by drilling to extract the calorific values of coal (ETU) and the percentage of ash, whose parameters were analysed in the laboratory of geo-mechanics according to the standards (ISO 9001) in order to eliminate the weak part of coal that would have a positive impact on increasing electricity production but also on reducing environmental pollution within the allowed values according to European Union standards. To carry out this work, a large number of drillings were performed from which 91 samples were taken at different depths, these samples were analysed and, at the same time, statistical processing was done in order to find the average caloric value of (ETU) and the content of ash with the lowest value, these parameters will help us to determine the method to be applied during the exploitation in order to create better conditions for the transport process to the power plants by means of conveyor belts and, at the same time raising the quantity of energy production and reduction of carbon dioxide (CO2). Doi: 10.28991/CEJ-2022-08-08-05 Full Text: PDF
Styles APA, Harvard, Vancouver, ISO, etc.
4

Dreier, John E. « Management of Copper Heap Leach Projects : A Geologist’s Perspective ». SEG Discovery, no 122 (1 juillet 2020) : 13–25. http://dx.doi.org/10.5382/geo-and-mining-08.

Texte intégral
Résumé :
Editor’s note: The Geology and Mining series, edited by Dan Wood and Jeffrey Hedenquist, is designed to introduce early-career professionals and students to a variety of topics in mineral exploration, development, and mining, in order to provide insight into the many ways in which geoscientists contribute to the mineral industry. Abstract Copper production by heap leaching, coupled with solvent extraction and electrowinning (SX-EW), is a well-established technology, with an annual output of about 3.7 million tonnes (Mt) of copper metal. Ores presently amenable to copper heap leaching include copper oxides and secondary copper sulfides. Most copper deposits amenable to acid sulfate heap leaching result from supergene processes within porphyry copper systems, although copper heap leaching has been applied to sandstone and shale-hosted deposits, among others. Copper heap leaching is a rate-dependent process sensitive to copper mineralogy (copper oxides > secondary sulfides > hypogene sulfides), driven by the pH of the leach solution, the activity of ferric iron (Fe3+ (aq)) dissolved in the leach solution, and temperature. Acid consumption, a principal operating cost item, depends on the pH of the leach solution; the presence of reactive gangue minerals, notably carbonates, Ca plagioclase, pyroxene, Fe-rich amphibole, and olivine; and the cumulative surface area of material in the heap. There are three basic approaches to commercial copper heap leaching—run-of-mine, dedicated pad, and on-off pad leaching, with variables that include crushing, acid/ferric agglomeration, solution application rate, and leach solution pH. These approaches affect copper leach kinetics, overall copper recovery, acid consumption, and capital and operating costs. A successful copper heap leach evaluation program requires a systematic approach, beginning with geologic mapping, then drilling and hydraulic and metallurgical testing, and concluding with financial analysis, engineering, and permitting. As geologists are the unique party in the process, with a thorough understanding of the overall deposit geology, including ore and gangue mineralogy, the domains that comprise the deposit, and the geochemistry of leaching, they must remain fully involved in the project throughout the evaluation. At the outset, geologists must manage the drilling program and define the grade-mineral domains. Later, they must participate in the metallurgical and hydraulic testing programs, including the evaluation of test results; then, during financial modeling, they must collaborate with all of the other specialists.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Ismail, Nur Syakiran Akmal, Norehan Abdullah, Kalthum Hassan, Shamzaeffa Samsudin, Ummu Atiyah Ahmad Zakuan, Rohana Yusof et Nurzalyna Mohamed Zaki. « Kesejahteraan hidup warga emas : Perancangan berasaskan gender ». Malaysian Journal of Society and Space 13, no 3 (29 août 2017) : 75–85. http://dx.doi.org/10.17576/geo-2017-1303-08.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Ibrahim, Mohd Yusri. « Pengaruh amalan komunikasi terhadap penglibatan belia dalam kesukarelawanan ». Malaysian Journal of Society and Space 13, no 4 (30 novembre 2017) : 80–92. http://dx.doi.org/10.17576/geo-2017-1304-08.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Mohamed, Siti Norsakira, et Rosniza Aznie Che Rose. « Potensi bandar Kuala Lipis sebagai destinasi pelancongan warisan ». Malaysian Journal of Society and Space 14, no 1 (28 février 2018) : 102–15. http://dx.doi.org/10.17576/geo-2018-1401-08.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
8

R, Zaimah, Novel Lyndon, Sarmila M.S et Mohd Yusof Hussain. « Tahap kepuasan pekebun kecil sawit terhadap amalan integrasi sawit ». Malaysian Journal of Society and Space 14, no 2 (29 mai 2018) : 97–107. http://dx.doi.org/10.17576/geo-2018-1402-08.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
9

Roslam, Aini Fatihah, Nor Azizan Idris et Zarina Othman. « Analisis sekatan bilateral Amerika Syarikat terhadap Myanmar ». Malaysian Journal of Society and Space 14, no 3 (27 août 2018) : 101–15. http://dx.doi.org/10.17576/geo-2018-1403-08.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

Yésou, Hervé, Pierre Chastanet, Jérôme Maxant, Claire Huber, Stephen Clandillon, Stéphanie Battiston, Catherine Proy et Paul De Fraipont. « Contribution de l'imagerie Pléiades à la cartographie rapide des dégâts suite à des catastrophes majeures : retours d'expériences après deux ans d'actions de cartographie rapide localisées en Asie, en Afrique, en Europe et aux Caraïbes ». Revue Française de Photogrammétrie et de Télédétection, no 209 (29 janvier 2015) : 81–87. http://dx.doi.org/10.52638/rfpt.2015.236.

Texte intégral
Résumé :
Le lancement des deux satellites Pléiades 1A et 1B fin 2011 et 2012 a permis à la France de se doter de nouvelles capacités d'acquisition d'images optiques à très haute résolution, dans le domaine particulier de la gestion des crises mais aussi plus largement dans différentes thématiques d'Observation de la Terre. Les capacités et spécificités techniques de la Constellation Pléiades ouvrent de réelles opportunités pour la cartographie des dégâts suite à une catastrophe. Depuis 2012, le CNES, Airbus Defence and Space Geo-Intelligence et le SERTIT, ont combiné leurs efforts à plusieurs reprises pour assister les acteurs internationaux de la gestion de crise, optimisant les programmations des satellites Pléiades et analysant les images acquises. Différentes actions de cartographie réactive ont ainsi été menées, exploitant le potentiel de la Constellation Pléiades: inondations à Krymsk en Russie (07-2012), tremblement de terre dans la province iranienne d'Azerbaïdjan oriental (08-2012), inondations au Niger (08-2012), cyclone Sandy en Haïti (11-2012), typhon Bopha aux Philippines (12-2012), cyclone Evan à Wallis et Futuna (12-2012), cyclone Haruna à Madagascar (02-2013), inondations au Sénégal (08-2013), le cyclone Bejisa sur l'île de la Réunion (01-2014). Les premiers retours d'expérience sont plus que positifs, démontrant que les le système Pléiades est particulièrement adapté à la gestion de crise dans sa phase d'urgence. La très haute résolution spatiale permet une cartographie précise essentielle dans les zones critiques telles que les paysages urbains ou les infrastructures sensibles, la possibilité d'acquisition journalière et la livraison rapide des données constituent des atouts majeurs pour les applications spatiales, notamment pour la gestion des risques.
Styles APA, Harvard, Vancouver, ISO, etc.

Thèses sur le sujet "GEO/08"

1

Re, Viviana <1981&gt. « Groundwater in urban coastal areas : hydrogeochemical based approach for managing the transition areas : the example of the lagoon of Nador (Morocco) ». Doctoral thesis, Università Ca' Foscari Venezia, 2011. http://hdl.handle.net/10579/1059.

Texte intégral
Résumé :
Nell’ambito del progetto SAP MED, la laguna di Nador rappresenta il caso di studio Marocchino per la sottocomponente gestita da UNESCO-IHP. Lo studio dell’acquifero di Bou-Areg e della laguna di Nador ha due obiettivi principali: (i) dimostrare l’importanza degli studi idrogeochimici a supporto della gestione degli acquiferi costieri e (ii) definire la qualità delle acque sotterranee ed le loro interazioni con la laguna. Questo lavoro ha permesso di identificare le acque di ruscellamento e flussi di ritorno agricoli come le due principali fonti di ricarica dell’acquifero. In base all’analisi idrochimica e statistica, è possibile escludere la presenza di processi di intrusione salina, mentre, le attività agricole e domestiche sono considerate le principali cause dell’alterazione della normale salinità dell’acquifero. L’analisi isotopica ha infine permesso di individuare due principali fonti di azoto nelle acque sotterranee: (i) fertilizzanti sintetici e (ii) effluenti di fosse settiche.
The hydrogeochemical investigation on the Bou-Areg Plain and Lagoon of Nador (Morocco) is, framed within the UNESCO-IHP sub component of the MED MAP project, as the Moroccan pilot case study. Its main research goals were (i) to demonstrate the effectiveness of hydrogeochemical tools for coastal aquifers management, with focus on urban coastal areas in semi-arid climates and (ii) to unravel the role of groundwater in sustaining transition areas. The study allowed for the identification of surface runoff and agricultural return flows as the main sources of aquifer recharge. Moreover, the effects of agricultural practices are increasing the natural high salinization of the aquifer. The isotopic signal of dissolved nitrates allowed for the identification of two main nitrogen sources in the system: (i) fertilizers and (ii) manure and septic effluent. The PCA analysis supported the absence of saline water intrusion in the aquifer.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Di, Roberto Alessio <1978&gt. « Depositi torbiditici cogenetici a frane oloceniche del vulcano di Stromboli : implicazioni per la mitigazione del rischio derivante da tsunami ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/225/1/Tesi_dottorato.pdf.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Di, Roberto Alessio <1978&gt. « Depositi torbiditici cogenetici a frane oloceniche del vulcano di Stromboli : implicazioni per la mitigazione del rischio derivante da tsunami ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/225/.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Tesi, Tommaso <1978&gt. « Destino del carbonio organico di apporto fluviale sulle piattaforme continentali : Adriatico centro-settentrionale e Golfo del Leone ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/446/1/Tommaso_Tesi_XIX_ciclo_S._Ambientali.pdf.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Tesi, Tommaso <1978&gt. « Destino del carbonio organico di apporto fluviale sulle piattaforme continentali : Adriatico centro-settentrionale e Golfo del Leone ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/446/.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Chirico, Giuseppe Damiano <1973&gt. « Studio probabilistico della pericolosità da colate di lava al vulcano Nyiragongo (Repubblica Democratica del Congo) e possibili misure volte alla riduzione del rischio ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/537/1/chirico_tesi.pdf.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Chirico, Giuseppe Damiano <1973&gt. « Studio probabilistico della pericolosità da colate di lava al vulcano Nyiragongo (Repubblica Democratica del Congo) e possibili misure volte alla riduzione del rischio ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/537/.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
8

Mori, Guido <1978&gt. « The use of Ground Penetrating Radar and alternative geophysical techniques for assessing embankments and dykes safety ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2138/1/Mori_Guido_Tesi.pdf.

Texte intégral
Résumé :
The research is part of a survey for the detection of the hydraulic and geotechnical conditions of river embankments funded by the Reno River Basin Regional Technical Service of the Region Emilia-Romagna. The hydraulic safety of the Reno River, one of the main rivers in North-Eastern Italy, is indeed of primary importance to the Emilia-Romagna regional administration. The large longitudinal extent of the banks (several hundreds of kilometres) has placed great interest in non-destructive geophysical methods, which, compared to other methods such as drilling, allow for the faster and often less expensive acquisition of high-resolution data. The present work aims to experience the Ground Penetrating Radar (GPR) for the detection of local non-homogeneities (mainly stratigraphic contacts, cavities and conduits) inside the Reno River and its tributaries embankments, taking into account supplementary data collected with traditional destructive tests (boreholes, cone penetration tests etc.). A comparison with non-destructive methodologies likewise electric resistivity tomography (ERT), Multi-channels Analysis of Surface Waves (MASW), FDEM induction, was also carried out in order to verify the usability of GPR and to provide integration of various geophysical methods in the process of regular maintenance and check of the embankments condition. The first part of this thesis is dedicated to the explanation of the state of art concerning the geographic, geomorphologic and geotechnical characteristics of Reno River and its tributaries embankments, as well as the description of some geophysical applications provided on embankments belonging to European and North-American Rivers, which were used as bibliographic basis for this thesis realisation. The second part is an overview of the geophysical methods that were employed for this research, (with a particular attention to the GPR), reporting also their theoretical basis and a deepening of some techniques of the geophysical data analysis and representation, when applied to river embankments. The successive chapters, following the main scope of this research that is to highlight advantages and drawbacks in the use of Ground Penetrating Radar applied to Reno River and its tributaries embankments, show the results obtained analyzing different cases that could yield the formation of weakness zones, which successively lead to the embankment failure. As advantages, a considerable velocity of acquisition and a spatial resolution of the obtained data, incomparable with respect to other methodologies, were recorded. With regard to the drawbacks, some factors, related to the attenuation losses of wave propagation, due to different content in clay, silt, and sand, as well as surface effects have significantly limited the correlation between GPR profiles and geotechnical information and therefore compromised the embankment safety assessment. Recapitulating, the Ground Penetrating Radar could represent a suitable tool for checking up river dike conditions, but its use has significantly limited by geometric and geotechnical characteristics of the Reno River and its tributaries levees. As a matter of facts, only the shallower part of the embankment was investigate, achieving also information just related to changes in electrical properties, without any numerical measurement. Furthermore, GPR application is ineffective for a preliminary assessment of embankment safety conditions, while for detailed campaigns at shallow depth, which aims to achieve immediate results with optimal precision, its usage is totally recommended. The cases where multidisciplinary approach was tested, reveal an optimal interconnection of the various geophysical methodologies employed, producing qualitative results concerning the preliminary phase (FDEM), assuring quantitative and high confidential description of the subsoil (ERT) and finally, providing fast and highly detailed analysis (GPR). Trying to furnish some recommendations for future researches, the simultaneous exploitation of many geophysical devices to assess safety conditions of river embankments is absolutely suggested, especially to face reliable flood event, when the entire extension of the embankments themselves must be investigated.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Mori, Guido <1978&gt. « The use of Ground Penetrating Radar and alternative geophysical techniques for assessing embankments and dykes safety ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2138/.

Texte intégral
Résumé :
The research is part of a survey for the detection of the hydraulic and geotechnical conditions of river embankments funded by the Reno River Basin Regional Technical Service of the Region Emilia-Romagna. The hydraulic safety of the Reno River, one of the main rivers in North-Eastern Italy, is indeed of primary importance to the Emilia-Romagna regional administration. The large longitudinal extent of the banks (several hundreds of kilometres) has placed great interest in non-destructive geophysical methods, which, compared to other methods such as drilling, allow for the faster and often less expensive acquisition of high-resolution data. The present work aims to experience the Ground Penetrating Radar (GPR) for the detection of local non-homogeneities (mainly stratigraphic contacts, cavities and conduits) inside the Reno River and its tributaries embankments, taking into account supplementary data collected with traditional destructive tests (boreholes, cone penetration tests etc.). A comparison with non-destructive methodologies likewise electric resistivity tomography (ERT), Multi-channels Analysis of Surface Waves (MASW), FDEM induction, was also carried out in order to verify the usability of GPR and to provide integration of various geophysical methods in the process of regular maintenance and check of the embankments condition. The first part of this thesis is dedicated to the explanation of the state of art concerning the geographic, geomorphologic and geotechnical characteristics of Reno River and its tributaries embankments, as well as the description of some geophysical applications provided on embankments belonging to European and North-American Rivers, which were used as bibliographic basis for this thesis realisation. The second part is an overview of the geophysical methods that were employed for this research, (with a particular attention to the GPR), reporting also their theoretical basis and a deepening of some techniques of the geophysical data analysis and representation, when applied to river embankments. The successive chapters, following the main scope of this research that is to highlight advantages and drawbacks in the use of Ground Penetrating Radar applied to Reno River and its tributaries embankments, show the results obtained analyzing different cases that could yield the formation of weakness zones, which successively lead to the embankment failure. As advantages, a considerable velocity of acquisition and a spatial resolution of the obtained data, incomparable with respect to other methodologies, were recorded. With regard to the drawbacks, some factors, related to the attenuation losses of wave propagation, due to different content in clay, silt, and sand, as well as surface effects have significantly limited the correlation between GPR profiles and geotechnical information and therefore compromised the embankment safety assessment. Recapitulating, the Ground Penetrating Radar could represent a suitable tool for checking up river dike conditions, but its use has significantly limited by geometric and geotechnical characteristics of the Reno River and its tributaries levees. As a matter of facts, only the shallower part of the embankment was investigate, achieving also information just related to changes in electrical properties, without any numerical measurement. Furthermore, GPR application is ineffective for a preliminary assessment of embankment safety conditions, while for detailed campaigns at shallow depth, which aims to achieve immediate results with optimal precision, its usage is totally recommended. The cases where multidisciplinary approach was tested, reveal an optimal interconnection of the various geophysical methodologies employed, producing qualitative results concerning the preliminary phase (FDEM), assuring quantitative and high confidential description of the subsoil (ERT) and finally, providing fast and highly detailed analysis (GPR). Trying to furnish some recommendations for future researches, the simultaneous exploitation of many geophysical devices to assess safety conditions of river embankments is absolutely suggested, especially to face reliable flood event, when the entire extension of the embankments themselves must be investigated.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Forni, Francesca <1979&gt. « Petrology and geochemistry of Lipari Island (Aeolian archipelago) : constraints on magma genesis and evolution ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3785/1/Forni_Francesca_tesi.pdf.

Texte intégral
Résumé :
A full set of geochemical and Sr, Nd and Pb isotope data both on bulk-rock and mineral samples is provided for volcanic rocks representative of the whole stratigraphic succession of Lipari Island in the Aeolian archipelago. These data, together with petrographic observations and melt/fluid inclusion investigations from the literature, give outlines on the petrogenesis and evolution of magmas through the magmatic and eruptive history of Lipari. This is the result of nine successive Eruptive Epochs developing between 271 ka and historical times, as derived from recentmost volcanological and stratigraphic studies, combined with available radiometric ages and correlation of tephra layers and marine terrace deposits. These Eruptive Epochs are characterized by distinctive vents partly overlapping in space and time, mostly under control of the main regional tectonic trends (NNW-SSE, N-S and minor E-W). A large variety of lava flows, scoriaceous deposits, lava domes, coulees and pyroclastics are emplaced, ranging in composition through time from calcalkaline (CA) and high-K (HKCA) basaltic andesites to rhyolites. CA and HKCA basaltic andesitic to dacitic magmas were erupted between 271 and 81 ka (Eruptive Epochs 1-6) from volcanic edifices located along the western coast of the island (and subordinately the eastern Monterosa) and the M.Chirica and M.S.Angelo stratocones. These mafic to intermediate magmas mainly evolved through AFC and RAFC processes, involving fractionation of mafic phases, assimilation of wall rocks and mixing with newly injected mafic magmas. Following a 40 ka-long period of volcanic quiescence, the rhyolitic magmas were lately erupted from eruptive vents located in the southern and north-eastern sectors of Lipari between 40 ka and historical times (Eruptive Epochs 7-9). They are suggested to derive from the previous mafic to intermediate melts through AFC processes. During the early phases of rhyolitic magmatism (Eruptive Epochs 7-8), enclaves-rich rocks and banded pumices, ranging in composition from HKCA dacites to low-SiO2 rhyolites were erupted, representing the products of magma mixing between fresh mafic magmas and the fractionated rhyolitic melts. The interaction of mantle-derived magmas with the crust represents an essential process during the whole magmatic hystory of Lipari, and is responsible for the wide range of observed geochemical and isotopic variations. The crustal contribution was particularly important during the intermediate phases of activity of Lipari when the cordierite-bearing lavas were erupted from the M. S.Angelo volcano (Eruptive Epoch 5, 105 ka). These lavas are interpreted as the result of mixing and subsequent hybridization of mantle-derived magmas, akin to the ones characterizing the older phases of activity of Lipari (Eruptive Epochs 1-4), and crustal anatectic melts derived from dehydration-melting reactions of metapelites in the lower crust. A comparison between the adjacent islands of Lipari and Vulcano outlines that their mafic to intermediate magmas seem to be genetically connected and derive from a similar mantle source affected by different degrees of partial melting (and variable extent of crustal assimilation) producing either the CA magmas of Lipari (higher degrees) or the HKCA to SHO magmas of Vulcano (lower degrees). On a regional scale, the most primitive rocks (SiO2<56%, MgO>3.5%) of Lipari, Vulcano, Salina and Filicudi are suggested to derive from a similar MORB-like source, variably metasomatized by aqueous fluids coming from the slab and subordinately by the additions of sediments.
Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "GEO/08"

1

FERNANDES, J. S. « O CARIRI CEARENSE : NATUREZA, FÉ E DINÂMICA URBANA CONTEMPORÂNEA ». Dans GEOGRAFIA : SOCIEDADE, POPULAÇÕES E NATUREZA, 148–65. Arco Editores, 2021. http://dx.doi.org/10.48209/geo-65-89949-08-3.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Petterson, Michael G. « Geo-Tectonics, Geology, and Geo-Resources of the Southwest Pacific ». Dans Encyclopedia of Geology, 724–41. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-08-102908-4.00062-x.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Aber, Susan Elizabeth Ward, et Jeremy Ward Aber. « Spatial Thinking and Geo-Literacy ». Dans Map Librarianship, 17–52. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-08-100021-2.00002-x.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

dell’Olio, Luigi, Angel Ibeas, Juan de Oña et Rocio de Oña. « Geo-Social Differences in the Perception of Quality ». Dans Public Transportation Quality of Service, 63–83. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-08-102080-7.00005-7.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "GEO/08"

1

Marina Pantazidou et Kyriakos Kandris. « CREATING AN ONLINE VERSION OF AN ENVIRONMENTAL GEOTECHNICS COURSE : PEDAGOGICAL OPPORTUNITIES ». Dans IV International Conference on Geo-Engineering Education. London, UK : International Society for Soil Mechanics and Geotechnical Engineering - ISSMGE, 2016. http://dx.doi.org/10.20906/cps/sfge-08-0001.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Burul, Tatiana N. « MODERN GEO-ECOLOGICAL PROBLEMS ON THE TERRITORY OF THE PALLASOVSKY DISTRICT OF THE VOLGOGRAD REGION ». Dans Treshnikov readings – 2021 Modern geographical global picture and technology of geographic education. Ulyanovsk State Pedagogical University named after I. N. Ulyanov, 2021. http://dx.doi.org/10.33065/978-5-907216-08-2-2021-8-10.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Stenshin, Ilya M., Ivan V. Blagoveshchenskii et Igor A. Shumilkin. « DISTRIBUTION OF ELASMOSAURID REMAINS IN THE HAUTERIVIAN DEPOSITS OF THE ULYANOVSK VOLGA REGION ». Dans Treshnikov readings – 2021 Modern geographical global picture and technology of geographic education. Ulyanovsk State Pedagogical University named after I. N. Ulyanov, 2021. http://dx.doi.org/10.33065/978-5-907216-08-2-2021-269-271.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie