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Showing 1 to 17 of 17 for “"melt inclusion"”.
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Melt Inclusion Geochemistry
Silicate melt inclusions (MI) are small samples of melt that are trapped during crystal growth at magmatic pressures and temperatures. The MI represent a sample of the melt that was isolated from the magma during host crystal growth. Thus, MI provide a valuable tool for constraining the magmatic …
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Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets
H2O and CO2 concentrations of the glass phase in melt inclusions (MI) are commonly used both as a barometer and to track magma degassing behavior during ascent due to the strong pressure dependence of H2O and CO2 solubilities in silicate melts. A requirement for this method to be valid is that the …
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Martian meteorites as windows into planetary volcanism: insights from olivine-phyric shergottite meteorites
… interpreted to represent primary mantle derived melts, and can be categorised into three distinct geochemical groups, incompatible-trace element depleted, intermediate, and enriched, reflecting distinct source reservoirs. The primary focus of remaining chapters (3 and 4) of this dissertation is …
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Magmatic processes at basaltic volcanoes: insights from the crystal cargo
… processing occurs in magma reservoirs, where melts are stored prior to eruption. Magma reservoirs are complex, open systems, and often multiple reservoirs are partially inter-connected from source to surface, giving rise to the term 'volcanic plumbing system'. Parental melts feeding these …
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Applications of Melt Inclusions to Problems in Igneous Petrogenesis
… petrogenetic processes is through the study of melt and fluid inclusions. The research presented here examines melt inclusions through experimental, analytical and field studies to better understand igneous petrogenesis. One potential problem associated with melt inclusions is water-loss during …
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The volatile contents of melt inclusions and implications for mantle degassing and ocean island evolution
… of volatile elements dissolved in silicate melts is a controlling factor in a range of geologic processes, which include hazardous volcanic eruptions, economically-significant ore-forming systems, and global-scale volatile fluxes, which contribute to planetary evolution. While melt volatile …
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Evaluating mantle and crustal processes using isotope geochemistry
… crust and the mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale of the mantle heterogeneities, and uses U-series isotope to constrain geodynamic parameters, such as the upwelling velocities and porosities of mantle plumes. The lower continental …
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Silicate Melt Inclusions in Igneous Petrogenesis
Silicate melt inclusions are ubiquitous in quartz phenocrysts, yet there are few studies of such inclusions from porphyry copper systems. A melt inclusion forms when magma is trapped in a growing phenocryst. If a phenocryst is able to preserve the original parent magma, then accurate information …
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Studies of volatile evolution in magmatic systems using melt inclusions
… physical state (volatiles dissolved in silicate melts vs. volatiles exsolved as vapor). For active volcanic systems studying the volatile evolution can help to assess the potential hazard associated to a certain locality. Also, volatile evolution in magmatic system controls the formation of …
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Geochemistry of fluid-rock processes
… These microscopic features are called fluid and melt inclusions, and are one of the best tools available to probe, measure and determine the chemical and physical properties of crustal fluids. In the present study we examine new developments into our understanding of fluid-rock interactions using …
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Deep Earth volatile cycles as revealed by basalt chemistry
… systematics in suites of basaltic glass and melt inclusions have been widely used to infer volatile abundances in the depleted mantle, but have resulted in a large diversity of estimates. In this thesis a new statistical treatment of such datasets is developed, using simple numerical models …
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Evaluating mantle and crustal processes using isotope geochemistry
… crust and the mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale of the mantle heterogeneities, and uses U-series isotope to constrain geodynamic parameters, such as the upwelling velocities and porosities of mantle plumes. The lower continental …
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Microanalytical Constraints on the Geometry and Chemical Evolution of Kīlauea’s Volcanic Plumbing System
… moving away from a model where large vats of melt are stored in the crust, to a model dominated by extensive piles of settled crystals. This thesis examines the petrological evidence for this ‘mush-dominated’ model at Kīlauea Volcano, using a variety of state-of-the-art microanalytical …
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The record of magma storage conditions in mineral compositions below a glacial to ice-free Askja volcano, Iceland
… projects, further investigation could involve melt inclusion analysis and geothermobarometry to constrain specific depths and pressures at which the crystals in the lavas formed. By investigating mineral compositions and textures and analyzing the implications on crystal cargo and magma storage …
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Stratigraphic and Geochemical Insights into Explosive Volcanism in Northwestern Nicaragua: Case Studies from the Momotombo-Monte Galán Volcanic System and Cosigüina Volcano
… matrix glass, plagioclase phenocrysts, and melt inclusions. The textures of the sampled clasts were also characterized using a combination of techniques at multiple scales. This work led to the discovery that prior to eruption the dacite and andesite were in close proximity in a shallow (~ 4 …
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Carbon systematics of the Icelandic crust and mantle
… to the low solubility of carbon within silicate melt, these undegassed basalt suites are rare. The majority of basalts have lost their mantle carbon information en route to eruption through the crust. Various crustal processes act to modify the geochemistry of melts before eruption, therefore it …
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An unexpected journey: experimental insights into magma and volatile transport beneath Erebus volcano, Antarctica
… physical volcanology, gas chemistry, petrology, melt inclusion research, seismic, and more. Despite this large data set, however, interpretations of Erebus rocks, particularly mafic and intermediate lavas, which are thought to originate from deep within the magmatic plumbing system, have been …