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Статті в журналах з теми "Inclusion vitreuse"
Guilhaumou, N., P. Dumas, G. L. Carr, and G. P. Williams. "Synchrotron Infrared Microspectrometry Applied to Petrography in Micrometer-Scale Range: Fluid Chemical Analysis and Mapping." Applied Spectroscopy 52, no. 8 (August 1998): 1029–34. http://dx.doi.org/10.1366/0003702981944797.
Повний текст джерелаConnors, Daniel, Gaurav Shah, Kevin Blinder, and Sabin Dang. "Early Versus Delayed Vitrectomy for Nondiabetic Vitreous Hemorrhage." Journal of VitreoRetinal Diseases 2, no. 2 (March 2018): 87–90. http://dx.doi.org/10.1177/2474126418758771.
Повний текст джерелаTalmon, Yeshayahu, Marc Adrian, and Jacques Dubochet. "Electron beam radiation damage to organic inclusions in vitreous, cubic, and hexagonal ice." Journal of Microscopy 141, no. 3 (March 1986): 375–84. http://dx.doi.org/10.1111/j.1365-2818.1986.tb02730.x.
Повний текст джерелаKarwowski, Łukasz, Joachim Kusz, Andrzej Muszyński, Ryszard Kryza, Maciej Sitarz, and Evgeny V. Galuskin. "Moraskoite, Na2Mg(PO4)F, a new mineral from the Morasko IAB-MG iron meteorite (Poland)." Mineralogical Magazine 79, no. 2 (April 2015): 387–98. http://dx.doi.org/10.1180/minmag.2015.079.2.16.
Повний текст джерелаLuais, Béatrice. "Immiscibilité entre liquides silicatés dans les mésostases et les inclusions vitreuses des andésites basiques de Santorin (Arc Egéen)." Bulletin de Minéralogie 110, no. 1 (1987): 93–109. http://dx.doi.org/10.3406/bulmi.1987.8028.
Повний текст джерелаArslanov, G. M., B. M. Aznabaev, T. R. Mukhamadeev, Z. R. Yanbukhtina, T. I. Dibaev, and G. R. Shakirova. "Electron Microscopic Retina Changes in Rabbit Eyes with Perfluorocarbon Liquids Intravitreal Tamponade." Ophthalmology in Russia 16, no. 1 (March 30, 2019): 81–87. http://dx.doi.org/10.18008/1816-5095-2019-1-81-87.
Повний текст джерелаSimanjuntak, Gilbert W. S. "Reimplantasi Lensa Setelah Komplikasi Operasi Katarak." Kesmas: National Public Health Journal 6, no. 4 (February 1, 2012): 168. http://dx.doi.org/10.21109/kesmas.v6i4.95.
Повний текст джерелаFabro, Filippo, and Carl Herbort. "Need for Quantitative Measurement Methods for Posterior Uveitis: Comparison of Dual FA/ICGA Angiography, EDI-OCT Choroidal Thickness and SUN Vitreous Haze Evaluation in Stromal Choroiditis." Klinische Monatsblätter für Augenheilkunde 235, no. 04 (April 2018): 424–35. http://dx.doi.org/10.1055/s-0043-124966.
Повний текст джерелаIaseniuc, O., M. Iovu, S. Rosoiu, M. Bardeanu, L. B. Enache, G. Mihai, O. Bordianu, et al. "Structural analysis of As-S-Sb-Te polycrystalline nanostructured semiconductors." Chalcogenide Letters 19, no. 11 (November 30, 2022): 841–46. http://dx.doi.org/10.15251/cl.2022.1911.841.
Повний текст джерелаRaval, Vishal, Randy Christopher Bowen, Hansell Soto, and Arun Singh. "Intravenous Chemotherapy for Retinoblastoma in the Era of Intravitreal Chemotherapy: A Systematic Review." Ocular Oncology and Pathology 7, no. 2 (December 16, 2020): 142–48. http://dx.doi.org/10.1159/000510506.
Повний текст джерелаДисертації з теми "Inclusion vitreuse"
Welsch, Benoît. "Signification des océanites dans le fonctionnement du Piton de la Fournaise, île de La Réunion." Electronic Thesis or Diss., La Réunion, 2010. https://tel.archives-ouvertes.fr/tel-04058678.
Повний текст джерелаThe shield volcano of Piton de la Fournaise (La Reunion Island, Indian Ocean) is well-known to have two different types of lavas: Steady State Basalts, which are aphyric basalts with a bulk-rock composition very homogeneous (6 – 7 wt% MgO) and Oceanite (8 – 29% wt MgO), which are basalts enriched in macrocrysts of olivine (Ø> 0.5 mm, Fo85–83, 5 – 60% vol.). Until now, two different origins were proposed for these lavas: (1) differentiation of a mafic magma by crystallization and settling of olivine in a magma chamber vertically stratified, or (2) percolation by a differentiated magma of a mush composed of olivine and clinopyroxene crystals. A new investigation of the texture and composition of these lavas lead us to rehabilitate the magmatic differentiation model within the shallow magma chamber (located at 2.5 km depth below the summit). We show that olivine macrocrysts have a dendritic shape relevant of rapid growth at the roof, walls and floor of the chamber. The crystallization of olivine is joined at low temperature by clinopyroxene and plagioclase, yielding to the formation of crystals, liquid and bubbles suspensions against the cold margins of the chamber. Our results suggest also that the eruptive activity of the volcano is controlled by convective instabilities occurring periodically at the roof of the magma chamber, just after the collapse of a horizon of bubbles and / or the gravitational settling of solids
Bouvier, Anne-Sophie. "Etude des magmas primaires de l'arc des Petites Antilles par l'analyse in situ des inclusions vitreuses." Thesis, Nancy 1, 2008. http://www.theses.fr/2008NAN10071/document.
Повний текст джерелаThe Lesser Antilles arc lavas display a large range of compositions. Previous studies have suggested a variable influence of fluids derived from the subducted oceanic lithosphere along the arc and within individual islands. The fluid contributions and their nature are still a matter of debate. In order to bring new constraints on magmagenesis conditions and on the influence and nature of fluids from the slab on the mantle source, high magnesia scoriae from St. Vincent and Grenada, in the south of the arc, have been used. Different analyses (light and trace elements, ?D, ??Li, ?11B, ?18O, ?34S) have been performed on olivine-hosted melt inclusions, using ion probe. Their study gives a direct access to the primitive magma compositions as yet unaffected by superficial processes. The association of several measurements permit three types of fluid components to be highlighted: 1- a seawater-like fluid, probably released by serpentinized mantle dehydration when it is pulled down by the slab, 2- fluids deriving from altered oceanic crust dehydration and 3- fluids issued from sediment dehydration. These aqueous fluids have different solute contents, reflecting their extraction depths. This dataset suggest a deeper genesis and lower partial melting rate (7-15%) for Grenada melts, St. Vincent melts being generated at 1190-1220°C, 13-14 kbar, from 10-20% partial melting
Florentin, Léa. "Étude d'inclusions vitreuses dans les olivines des chondres de type I : apport sur la formation de leurs olivines hôtes." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0059/document.
Повний текст джерелаChondrules, witnesses of the beginning of the Solar System still have a debated origin ti this day. In particular, the origin of chondrules' olivines is still poorly understood. Were they formed by magmatism or condensation processes? Inherited or grown directly within the chondrule? In order to answer this, a detailed chemical study was undertook on glass inclusions trapped in Mg-rich olivines from Allende (CV3) meteorite. 3D images and chemical depth profiles showed a similar behavior between Allende's inclusions and synthetic magmatic ones, which is an argument in favor of a magmatic origin for olivines. Glass inclusions were then heated at high temperature (1 800 °C) via a new and unique heating stage developed during the project, in order to study the homogeneous glasses. High Na2O amounts in heated inclusions show that they behave as closed systems and that olivines formed in a Na-rich environment. Because Na is highly volatile at high temperatures, such an environment is hard to reconcile with olivines forming by condensation or magmatism within chondrules. This suggests that olivines are inherited. Measurements of REE were performed via SIMS in inclusions and hosts olivines in order to calculate the crystallization rates necessary to olivines formation. Chemical compositions of parent magmas, calculated from crystallization rates correspond to those expected from previous experimental studies. They suggest that olivines from chondrules form within molten planetesimals of global CI to CV composition
Bureau, Hélène. "Les éléments volatiles associés aux magmas du Piton de la Fournaise : une approche par l'étude des inclusions fluides et vitreuses." Paris 7, 1996. http://www.theses.fr/1996PA077023.
Повний текст джерелаGstalter, Nicole. "Les formations ponceuses a quartz de la région Sud de Basse-Terre (Guadeloupe) : pétrologie, géochimie, thermobarométrie et chimie des inclusions vitreuses." Paris 11, 1986. http://www.theses.fr/1986PA112257.
Повний текст джерелаThe study of the quartz pumiceous pyroclastics of southern Basse-Terre (lesser Antilles island arc) has been carried out as part of a regional prospection. The purpose of the study is to place the volcanic event(s) responsible for the pumiceous emissions in his (their) volcanologic background. The quartz, sometimes associate with amphibole, paragenesis of these pyroclastics is an indication of a shallow magmatic chamber rich in volatile compounds. Therefore these pyroclastics were a geothermal prospective target of outstanding importance. The pyroclastic outcrops are individually of little extension, but they are widely scattered over the southern part of the island. Previous fieldwork suggested that these pumices were all contemporaneous and could be used as a stratigraphic marker. This hypothesis had to be confirmed by detailed petrographic and geochemical study. Actually, the study of major and trace elements geochemistry of whole rocks and major elements geochemistry of melt inclusions has allowed demonstration that the whole of the pumiceous products is shared out among two different evolutive trends. Petrographic and geochemical characteristics are consistent with a dominant crystal fractionation evolutive process for bath suites, from basic andesitic to rhyolitic compositions. The principal mineral phases involved in the differentiation process, as defined by geochemical modelling, are those really observed as phenocrysts in the lava: olivine, plagioclase, clinopyroxene, orthopyroxene, titanomagnétite, ilmenite, quartz, amphibole; this latter mineral phase can be well represented rare or even absent. The pyroclastics show a Th/Ta ratio of 7-11, which is characteristic of convergent boundaries. Their position in A-F-M diagram, the law K20 content and Si02 oversaturation closely relates them to arc tholeites. The difference between the two suits is shown by the alkaline elements concentration and by the hygromagmaphiles elements concentration in the most primitive liquids of these suites. On the other hand, these most primitive liquids have identical transition elements concentrations. Geochemical characteristics of the two suites allow us to link each one with a different volcanic unit: - the Bouillante Chain, - the recent volcanic unit, essentially the "Grande Découverte" volcano. These two units are separated in time and in space. That makes the hypothesis of one quartz pumice key level is unlikely. Geochemical data allowed two hypothesis with respect to the origin of the primary melts of each suite: a. Primary melts are the results of different partial melting rates of an homogeneous source; the primary melt of the Grande Découverte volcano suite would be produced by a smaller partial melting rate, which could explain its K20 and hygromagmaphilic elements enrichment. B. Primary melts are the results of partial melting of an heterogeneous source. In the pumices, ribbon structures and ether heterogeneities are frequent. They are made up of two types of paragenesis, whose parental melts can be identified by the chemical composition of the melt inclusions of phenocrysts. The thermical and barometrical study of these intracristalline melt inclusions allowed a more precise determination of the P-T conditions at each step of crystallization. The comprehensive results demonstrate, for each suite, the simultaneous eruption of two cogenetic magmas at different steps of crystallization and suggest the existence of two magmatic chambers, that communicated during eruption: a. Deep chamber where olivine, plagioclase, augite, hypersthene, titanomagnetite crystallize from an H20 such basic andesitic melt, in a 1130-1000°C range of temperature. H20-rich fluid inclusions are present in the Ca-rich plagioclase, indicating the saturation of the melt with a volatile phase, principally made up of H20 Vapor. Melt inclusions chemistry allows to fix PH2O at 3-4 kbars and then the depth of the magma chamber at 10-12 kilometers b. A shallow chamber where plagioclase, hypersthene, ferro-hypersthene, titanomagnetite, ilmenite and quartz crystallize from a dacitic to rhyolitic melt. Amphibole may be associated with this paragenesis. The range of temperature is 950-810°C with PH20 ranging from 2,5-1,8 Kbars and probably inferior to total pressure. This present work allows petrographical and geochemical correlations between some quartz pumice falls of the Caribbean side of the island and two pumiceous levels already dated by quartz thermoluminescence: the Trois Rivières quartz pumice flow (140. 000 ± 14. 000 y. B. P. ) and the Montval pumiceous fall outcrop (108. 000 ± 10. 000 y. B. P. ) (Blanc, 1983). All these pumiceous products can be assigned to an unic eruptive episode of the Grande Découverte volcano. The variations in the importance of ribbon structures and the mineralogical, geochemical and thermometrical data lead to the reconstitution of the timing of this episode. In conclusion of the study, a general eruptive mechanism is proposed for bath suites. The interaction between a deep (10-12 km) and a shallow magmatic chamber is considered. Before eruption, the shallow chamber is subsaturated with volatile elements and thermicaly zoned. The rough degassing of deep magma (probably related injection towards the surface) induces volatile elements enrichment of the shallow magma chamber, the crystallization of hornblende and then the opening of this chamber to the surface. The induced decompression gives rise to the partial emptying of this chamber and even the simultaneous eruption of magmas from bath magmatic chambers
Gstalter, Nicole. "Les Formations ponceuses à quartz de la région sud de Basse-Terre, Guadeloupe pétrologie, géochimie, thermobarométrie et chimie des inclusions vitreuses." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598025b.
Повний текст джерелаGennaro, Mimma Emanuela. "Sulfur behavior and redox conditions in Etnean hydrous basalts inferred from melt inclusions and experimental glasses." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2005/document.
Повний текст джерелаSulfur is an important volatile component of magmas that presents different oxidation states, depending on the redox conditions and on the phase of occurrence: in silicate melts it is typically dissolved as S⁶⁺ and/or S²⁻ , in the gas phase it occurs principally as SO₂ (S⁴⁺ ) and H₂S (S²⁻). Mount Etna, in which magmatic redox conditions are poorly constrained, is used as a case study to investigate sulfur behavior in hydrous basaltic magmas during magma differentiation and degassing. This research integrates the study of natural olivine-hosted melt inclusions with an experimental study on S solubility in hydrous alkali basalts at magmatic conditions.Experimental results suggest the important control of ƒO₂ on the S abundance in Etnean hydrous magma and its partitioning between fluid and melt phases. Melt inclusions were entrapped at different depths inside the magmatic system (up to ~ 18 km, below crater level). They delineate a continuous differentiation trend, marked by fractional crystallization, from the picritic basalt (FS) toward the most evolved and degassed (2013) basalt. S content in Etnean melt is extremely variable and reaches 4150 ppm in the primitive melt inclusions. XANES Fe³⁺/ΣFe spectra in some glass inclusions, resulted in the generally decreasing of Fe³⁺/ΣFe ratios from the most primitive (FS) to the most evolved (2013) melts. MELTS software confirms that the Fe³⁺/ΣFe decrease is due principally to the melt differentiation process, enhanced to the S degassing at ƒO₂ < NNO+1. Magma reduction, in turn, induces the decrease of the sulfur solubility in the hydrous Etnean basalt, as well as of the sulfide saturation, and may constitute a possible enhancer of S exsolution, triggering the important S degassing observed in the last decades in Mt. Etna
LOVARADI, DRISS. "Etude isotopique (carbone, oxygene) et microthermometrique (inclusions fluides et vitreuses) des magmas alcalins et carbonatitiques du rift est africain et de la presqu'ile de kola." Paris 7, 1994. http://www.theses.fr/1994PA077266.
Повний текст джерелаSpilliaert, Nicolas. "DYNAMIQUES DE REMONTEE, DEGAZAGE ET ERUPTION DES MAGMAS BASALTIQUES RICHES EN VOLATILS :TRAÇAGE PAR LES INCLUSIONS VITREUSES ET MODELISATION DES PROCESSUS DANS LE CAS DE L'ETNA, 2000-2002." Phd thesis, Institut de physique du globe de paris - IPGP, 2006. http://tel.archives-ouvertes.fr/tel-00011876.
Повний текст джерелаNous avons constitué une base de données complète sur les éléments majeurs et les constituants volatils dissous (H2O, CO2, S, Cl et F) dans les magmas de l'Etna. Nous apportons des données nouvelles sur l'abondance en éléments volatils dissous (4%, dont une teneur en eau ~3,4%) dans le magma basaltique le plus primitif émis à l'Etna depuis 240 ans, et terme parental des trachybasaltes qui alimentent les éruptions actuelles du volcan. Nous proposons que l'évolution géochimique des magmas étnéens depuis 30 ans, résulte d'un mélange entre ce nouveau magma potassique et un terme trachybasaltique, mis en place dans les conduits avant les années 1970. L'analyse isotopique de l'eau et du soufre dissous dans les inclusions les plus primitives (delta(D) entre -120 et -90; ‰ ; delta(34S) = +2,4±0,4 ‰) conforte l'idée d'une source mantellique, de type OIB, peu affectée par la subduction ionienne toute proche, à l'encontre de certaines hypothèses préalablement formulées.
La détermination du CO2 et de l'eau dans les inclusions nous a permis (i) de contraindre les pressions de piégeage des liquides et d'exsolution du soufre, du chlore et du fluor, (ii) d'évaluer les profondeurs de transfert et de stockage du magma, (iii) de proposer un modèle d'évolution des rapports S/Cl et Cl/F dans la phase gazeuse dissoute et exsolvée en fonction de la pression, dans le cas des éruptions latérales et sommitales, et (iv) d'individualiser le rôle du globule de sulfure présent dans les magmas résidant superficiellement dans les conduits centraux.
Nous proposons ainsi que les éruptions de flanc en 2001 et 2002 résultent de la remontée et du dégazage, en système fermé, du magma basaltique à trachybasaltique, coexistant avec une phase gazeuse déjà exsolvée. Le magma le plus primitif, remonte d'une profondeur >10 km (sous le niveau de la mer), et est extrudé lors des fontaines de laves. Le plus gros volume de laves produit dérive du transfert du magma trachybasaltique, légèrement plus différencié et stocké à 5±1 km. Lors de son stockage temporaire, ce magma s'appauvrit en eau, en se rééquilibrant avec une phase gazeuse riche en CO2, d'origine profonde. La déshydratation partielle d'un magma, stocké dans les conduits, en relation avec un flux de gaz persistant, riche en CO2, est probablement un processus fréquent à l'Etna et dans d'autres volcans basaltiques.
L'évolution modélisée des rapports S/Cl et Cl/F dans la phase gazeuse confirme un dégazage dominant en système fermé en 2001 et 2002. Les valeurs calculées des rapports molaires S/Cl des gaz à la surface de 5,4 à 3,7 et Cl/F de ~2, dépendent de la cinétique de dégazage syn-éruptif du chlore, et sont en parfait accord avec les mesures in situ effectuées par télédétection, au cours de la même période éruptive. Toute ségrégation de bulles de gaz en profondeur se traduit par des rapports S/Cl plus élevés dans la phase gazeuse. Ceci est également vérifié par la modélisation en système fermé du dégazage du magma stagnant superficiellement dans les conduits centraux et saturé vis-à-vis du globule de sulfure. La modélisation en pression de l'évolution de ce rapport permet donc de contraindre les profondeurs d'accumulation et de transfert différentiel des bulles. La valeur des rapports S/Cl et Cl/F dans les gaz ainsi que la nature des produits solides associés apportent de fortes contraintes sur les mécanismes à l'origine des fontaines de laves.
Enfin, l'activité de dégazage persistant aux cratères, impliquant une convection efficace dans les conduits, suggèrerait la remontée de magma riche en éléments volatils jusqu'à de faibles profondeurs (≤ 1 km sous les cratères), et le recyclage du magma dégazé, afin d'alimenter les flux gazeux excédentaires.
Notre modélisation offre ainsi un cadre général d'interprétation de la composition des émissions gazeuses, et contribue à une meilleure compréhension des processus de dégazage des magmas basaltiques, riches en éléments volatils, à l'Etna.
Spilliaert, Nicolas. "Dynamiques de remontée, dégazage et éruption des magmas basaltiques riches en volatils : Traçage par les inclusions vitreuses et modélisation des processus dans le cas de l'Etna, 2000-2002." Paris, Institut de physique du globe, 2006. http://www.theses.fr/2006GLOB0022.
Повний текст джерелаThis study is aimed at better understanding magma degassing processes and associated eruptive dynamics through the study of the bulk rocks and mainly of olivine-hosted melt inclusions from explosive products of Mount Etna. We particularly focussed on the 2001 and 2002 flank eruptions that resulted from dyke intrusions, independent of the central conduits, and on three lava fountains at South-East summit crater, in 2000. We acquired a complete data set on major elements and volatile contents (H2O, CO2, S, Cl and F) of Etna magmas. We report new data on the amount of volatiles (4 wt%, among which ≥3. 4 wt% H2O) dissolved in the most primitive K-rich basaltic melt erupted at Mount Etna for the last 140 years. This basalt is actually the parental melt of the trachybasalts erupted during the recent volcanic activity. We also argue that the geochemical evolution of etnean lavas for the last 30 years, results from the mixing between the new K-rich melt and K-poorer trachybasalts, emplaced in the feeding system prior to 1970. Isotopic analysis of water and sulphur in the most primitive melt inclusions (δD between -120 and -90; ‰ ; δ34S = +2,4±0,4 ‰) reinforces the idea of an OIB-type mantle source and contradicts the hypothesis of its contamination by fluids derived from the Ionian subduction, as previously suggested. The systematic determination of CO2 and H2O contents of melt inclusions allow us (i) to provide constraints on melt entrapment and S, Cl and F initial exsolution pressures, (ii) to assess the depths of magma transfer and ponding, (iii) to propose a pressure-related model of the evolution of the dissolved and exsolved gas phase, and (iv) to evaluate the effect of the sulphide immiscible liquid on the sulphur degassing path. We propose that the 2001 and 2002 flank eruptions were sustained by closed system ascent and degassing of basaltic to trachybasaltic magmas. The most primitive magmas rose from at least ~10 km b. S. L. And sustained the powerful lava fountains that occurred in July 2001 and October 2002. Most of the lavas emitted in 2001 and 2002 derived from trachybasaltic magmas, ponding at 5±1 km b. S. L. , that were partially dehydrated because of their flushing by a CO2-rich gas phase of deep derivation. Such a process could be frequent at Etna and most likely at basaltic volcanoes. The S/Cl molar ratio in the associated gas phase is computed to be of 5. 4 and 3. 7, depend on the degassing dynamics upon eruption. These calculated values and those of the Cl/F (2) and S/CF (9) ratios confirm a dominant closed system magma ascent and degassing mechanism. They are in good agreement with those directly measured by teledetection during the 2001 and 2002 flank eruptions. Furthermore, any gas/melt separation occurring at greater depth would result in higher S/Cl ratios in the gas phase. This also applies to magmas, already saturated with sulphide globule, that are stored at shallow depths in the central conduits and degas under closed system conditions. Therefore, the modelled evolution of S/Cl and Cl/F ratios, both in the melt and the gas phase, gives access to the depths of gas segregation. The S/Cl and Cl/F ratios in the gas emission at the surface, along with the chemistry of associated solid products, bring strong constraints on the different mechanisms at the origin of lava fountains. Finally, steady state summit degassing, involving convective overturn in conduits, would imply ascent of volatile-rich magma until shallow depth (≤ 1 km under the craters), and thus the drain-back of the shallow degassed magma, in order to supply the excess gas flux at Mt Etna. As a whole, our modelling offers a general background to interpret gas emissions composition and so to better understand the different degassing processes that occur during the ascent of etnean volatile-rich basaltic melts