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Showing 1 to 20 of 83 for “"FRACTIONAL CRYSTALLIZATION"”.
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Graphical analogy for predicting the assimilate composition during assimilation/fractional crystallization of igneous magma
Includes bibliographical references.
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Gough Island--evaluation of a fractional crystallization model and an experimental study of the partitioning of a rare earth element in the system diopside/water,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
Fractional crystallization of mantle-derived basaltic melts is a critical process in producing a compositionally stratified continental crust characterized by a silicic upper crust and a mafic lower crust. This thesis explores outstanding questions associated with fractional crystallization through …
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Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
Fractional crystallization of mantle-derived basaltic melts is a critical process in producing a compositionally stratified continental crust characterized by a silicic upper crust and a mafic lower crust. This thesis explores outstanding questions associated with fractional crystallization through …
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Experimental studies of magmatic differentiation and the effects of water on phase stability
… primarily investigates how the conditions of crystallization affect the chemical evolution of magmas. A major focus is the effect of water on the stability of mineral phases, and how this affects both the differentiation of magmas and the modification of the upper mantle by hydrous fluid …
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Documenting Magma Evolution of the Fossa delle Felci (Salina Island, South Tyrrhenian Sea) by Integrating In Situ Plagioclase Data with Quantitative Modeling
… dominated by recharge, assimilation and fractional crystallization (RAFC), quantification of which can provide insights into eruption catalysts, and therefore assist in hazard mitigation. This study evaluates the relative roles of RAFC processes in Fossa delle Felci (Salina Island, Italy) …
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Petrogenesis of the phase 1 gabbro-diorite of the Miocene Mt Perkins Pluton, northwest Arizona: Implications for the role of mantle-derived mafic magmas in calc-alkaline magma evolution
… one of phases 2 and 3 evolved by a process of fractional crystallization of an asthenospheric mantle derived mafic magma and magma mixing with an upper crustal granitic magma. Phase 1 magmas evolved by fractional crystallization (required by the presence of cumulates) of an asthenospheric …
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Petrologic Significance of Multiple Magmas in the Quottoon Igneous Complex, NW British Columbia and SE Alaska
… preclude linkages between the two suites by fractional crystallization or assimilation and fractional crystallization (AFC) processes. The suite I rocks are interpreted to be the result of magma mixing between the QIC parental magma and a mantle derived magma. The samples do not lie along a …
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Deciphering the Signature of Magma Mixing: Examples from the Castle Creek Eruptive Period, Mount St. Helens, Washington
… of Castle Creek basalt. MELTS closed-system fractional crystallization simulations were also executed to model major element evolution during the Castle Creek eruptive period.</p> <p>MELTS simulations reveal primitive Cave basalt can be related to most Precave basalts, andesite and dacite …
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Petrology and geochemistry of syenite intrusions in the Eastern Province of Zambia
… to the folsic syenites which are attributed to fractional crystallization of a mafic alkaline syenite magma whilst the Pule, Tantha and Seya intrusion deviate from this Mayira intrusions define an alkaline trend representing fractional crystallization of a mafic alkaline syenite magma v;hilst …
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Hydrous melt generation in the Earth's mantle
… shows how and when to correct for low pressure fractional crystallization to get lavas back to equilibrium with the mantle. Terms are calibrated (in part, on experiments presented in Chapter 1) that add H₂O to spinel lherzolite multiple saturation point models as well as to thermometers and …
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Applications of Melt Inclusions to Problems in Igneous Petrogenesis
… melt can constrain igneous processes such as fractional crystallization, assimilation, and partial melting. Partition coefficients were determined for syngenetic clinopyroxene, orthopyroxene, and plagioclase in equilibrium with a dacitic melt using the Melt Inclusion-Mineral (MIM) technique. …
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Geochemistry of the Sabie River Basalt Formation in the central Lebombo, Karoo Igneous Province
… Petrogenetic models involving closed-system fractional crystallization; coupled assimilation (of granitic crust) fractional crystallization; replenished, tapped and fractionated magma chambers and partial melting are examined. Granitic crustal contamination appears to have been significant …
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Critical Material Recovery from Salt-Lakes and Spent Batteries with Membranes and Solvents
… electrodialysis, and solvent-driven fractional crystallization, aiming to enhance the efficiency and sustainability of metal recovery from both primary and secondary sources. The thesis findings are supported by direct experimental measurements and extensive computation involving …
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Magmatic processes that generated the rim andesites of Medicine Lake Volcano, N. California
… define a compositional trend that formed by fractional crystallization in a shallow magma chamber (~ 4 to 8 km). Petrologic evidence indicates pre-eruptive H20 contents of 2 to 4 wt.% H20 over a temperature range of 1070 to 900 C. Oxygen fugacity recorded in coexisting spinel and rhombohedral …
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Variations in δ56Fe during magma differentiation at Cedar Butte volcano: signatures of thermal diffusion?
… variation is consistent with forward models of fractional crystallization from a tholeiitic basaltic parent (McCurry et al., 2008) implying that rhyolites and thus continental crust may form by extended fractionation from basalt. To gain additional constraint on how magma differentiation from …
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THE PETROLOGY AND GEOCHEMISTRY OF HIGH CASCADE VOLCANICS IN SOUTHERN WASHINGTON: MOUNT ST. HELENS VOLCANO AND THE INDIAN HEAVEN BASALT FIELD (TRACE ELEMENT, ISOTOPES, MINERALOGY)
… from a basaltic andesite parental magma by fractional crystallization processes involving the observed phenocryst assemblages. However, the strontium and oxygen isotopic compositions of representative samples of the Mount St. Helens suite indicate that closed system processes cannot explain …
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Making oceanic plagiogranite bodies by thermal migration: evidence from the Agros transect, Troodos ophiolite, Cyprus
… primarily attributed to either extreme (>90%) fractional crystallization of a basaltic melt (Haase et al., 2006) or to partial melting and assimilation of hydrated oceanic crust (Koepke et al., 2004). Neither mechanism, however, provides a consistent explanation for the compositional and …
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Spatially controlled Fe isotope variations at Torres Del Paine
… four mechanisms: (1) crustal assimilation, (2) fractional crystallization, (3) late stage fluid exsolution and (4) thermal migration. Assimilation of isotopically light country rock would not produce the isotopically heavy Torres del Paine granites. Likewise, experimentally determined …
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Imaging the mantle in southwestern, Utah using geochemistry, and geographic information systems
… within each volcanic field is best explained by fractional crystallization. Field evidence, petrography, geochemistry and new dates support separate evolution of each volcanic field.
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