Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 107 for “"degassing"”.
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Degassing Behaviour of Basaltic Open Vent Volcanoes
… volatile components like HCl during passive degassing until the next explosive slug-bursting event. The second problem explores the turbulent structures of volcanic plumes. I show that it is possible to estimate volcanic water vapour fluxes with the combination of the measurement of …
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A mathematical model of the R-H vacuum degassing system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1981.
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
… the systematics of volcanogenic trace element degassing in multiple tectonic settings (arcs, ocean islands, and continental rifts) and outgassing environments (magmatic vents and lava-seawater interactions), and extends to the compositional evolution of volcanic plumes in the atmosphere. …
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Petrological insights into pre- and syn-eruptive degassing at Ambrym volcano, Vanuatu
… investigation of magmatic conditions and degassing processes at Ambrym volcano, a basaltic island arc volcano recently identified as a prodigious emitter of volcanic gases. Typical activity at this volcano entails heavy degassing from quasipermanent lava lakes, with Strombolian activity of …
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Experimental, geochemical and isotopic insights on melting and degassing behavior on Earth
… of the continental crust, onset of subduction, degassing of arc magmas, and mantle melting at mid-ocean ridges. Through this unlikely “medley” of Earth Science problems, parallels are drawn between experiments investigating melting and degassing at high pressure, geochemical and isotopic …
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Helium isotope geochemistry of oceanic volcanic rocks : implications for mantle heterogeneity and degassing
… 36Ar inventory, shows that present-day degassing rates are insufficient to generate the atmospheric argon. It is suggested that an episode of more rapid mant1e outgassing occurred in the past.
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Helium isotope geochemistry of oceanic volcanic rocks : implications for mantle heterogeneity and degassing
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982.
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Tectonics and volcanism on Venus : constraints from topographic relief, impact cratering, and degassing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The volatile contents of melt inclusions and implications for mantle degassing and ocean island evolution
… a free fluid phase during crystallization and degassing. In Chapter 2, we explore different experimental, microanalytical, and numerical methods which may be used to estimate the CO2 contents of melt inclusions that contain fluid bubbles and describe the advantages and disadvantages of each …
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Tracing mantle degassing along the East African Rift using He and C isotopes: a geospatial approach
… and lavas were used as tracers to detect mantle-degassing across the East African Rift. From the literature, a database of R/Ra and δ13C-CO2 values was produced with accompanying isotopic and geochemical data. The data was filtered, removing samples of ambiguous origin, and samples heavily …
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Syn-eruptive degassing of a single submarine lava flow : constraints on MORB CO2 variability, vesiculation, and eruption dynamics
… In this study, we explore the mechanisms of CO2 degassing and the implications this has for estimating the advance rates and durations of seafloor eruptions. We present dissolved volatile concentrations (mainly of CO2 and H2O) and vesicle size distributions (VSDs) for a unique suite of MORB …
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Syn-eruptive degassing of a single submarine lava flow : constraints on MORB CO₂ variability, vesiculation, and eruption dynamics
… In this study, we explore the mechanisms of CO2 degassing and the implications this has for estimating the advance rates and durations of seafloor eruptions. We present dissolved volatile concentrations (mainly of CO 2 and H20) and vesicle size distributions (VSDs) for a unique suite of MORB …
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Magmatic volatiles at rifts and arcs: Sources and fractionation effects
Mantle degassing is a fundamental process that modifies the chemical composition of the atmosphere, crust, and deep Earth. Elements are returned to the mantle from surface reservoirs through subduction at convergent margins. Melts generated in the mantle carry dissolved volatiles from depth and …
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MAGMA STORAGE, ASCENT AND DEGASSING HISTORIES TRACED BY TEXTURES AND CHEMICAL ZONING IN CRYSTALS: APPLICATION TO THE CO2-RICH BASALTIC SYSTEM OF MT. ETNA VOLCANO
Un ampio dataset costituito da crystalli di plagioclasio ed olivina relativo alle lave emesse durante l attività parossistica tra il 2011 e il 2013 al vulcano Etna, è stato utilizzato per definire le modalità e le scale temporali dei processi di residenza e trasferimento dei magmi in superficie. …
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Deep Earth volatile cycles as revealed by basalt chemistry
… numerical models for concurrent magma mixing and degassing. It is demonstrated that the role of magma degassing was previously underestimated, and the variability in apparent mantle volatile concentrations is largely a result of variability in magma mixing and degassing. Using a large new dataset …
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Volatiles in Icelandic subglacial rhyolite
… pre-eruptive volatile concentrations and degassing paths are lacking from subglacially erupted edifices and thus the role of volatiles in determining the explosivity of subglacial eruptions remains unclear. The eruptive mechanisms of subglacial rhyolite are particularly poorly understood …
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