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.
Results
Showing 1 to 20 of 67 for “"Silicic"”.
-
Silicic acid, its influence and removal in water purification
Made available in DSpace on 2017-11-30T21:03:37Z (GMT). No. of bitstreams: 2 6001933.pdf: 5805844 bytes, checksum: 8eefa850c70a1d1c28f71fac3a90e0c1 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1919
-
Competitive Adsorption of Arsenite and Silicic Acid on Goethite
The adsorption behavior of silicic acid and arsenite alone and competitively on goethite over a broad pH range (3-11) at environmentally relevant concentrations was investigated utilizing pH adsorption data and zeta potential measurements. Both addition scenarios (Si before As(III) and As(III) …
-
Embayments in explosive, silicic eruptions : a textural, numerical, and experimental assessment.
I explore the occurrence and formation of embayments in quartz using textural, experimental, and numerical techniques. Embayments are pockets of melt partially trapped inside of volcanic crystals. During eruption these pockets of melt quench to glass. The concentration of water within embayment …
-
Evolution of a small silicic system: The McCullough Pass Caldera, Clark County, Nevada
The McCullough Pass Caldera is a small caldera in southern Nevada formed by the eruption of the McCullough Pass rhyolites. The McCullough Pass rhyolites erupted as three successive rhyolitic magma batches from 14.12 to 13.98 Ma and produced the McCullough Pass caldera. Each magma batch was …
-
How similar are silicic volcanic and plutonic systems? New insights into upper crustal storage conditions and formation processes of ignimbrites
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
-
Origin of net-veined and mixed-magma ring intrusions
… emplacement of mafic, intermediate and silicic magmas. Net-veined ring-intrusions consist of areas of granophyric net-veined mafic to intermediate rock which elsewhere forms rounded to elongate pillows in a silicic host rock. Mixed-magma ring intrusions contain small inclusions of …
-
Petrogenetic Relationship of the Postcaldera Eruptions of Mount Mazama, Crater Lake, Oregon; Evolution of a Sub-volcanic Magma Chamber Following a Large Silicic Eruption
… evolve following a shallow, relatively large silicic eruption is the focus of this study. In situ geochemical analysis coupled with high-resolution textural images of plagioclase crystals in the four postcaldera volcanic edifices were used to identify distinct crystal populations and identify …
-
The petrology and geochemistry of Precaldera Magmas, Long Valley Caldera, Eastern California
… (> 24 km³), (2) local orthopyroxene -phyric silicic trachyandesite flows (> I km³), and (3) sparsely -phyric orthopyroxene -hornblende -plagioclase quartz latite dome-flows and coarsely -phyric biotite -hornblende -plagioclase quartz latite dome-flows ( > 4 km³) erupted in that general …
-
Commonalities in the emplacement of cooling-limited lavas : insights from the 2011-2012 Cordón Caulle rhyolitic eruption
… are relatively well studied, the infrequency of silicic eruptions has limited our understanding of the emplacement of high-viscosity rhyolitic lavas. The 2011-2012 eruption of Puyehue-Cordón Caulle in southern Chile provided a unique opportunity to make scientific observations of an active …
-
Ghost granophyre: A new texture with implications for plagiogranite differentiation and Ti-in-Quartz thermometry
… can represent relatively extensive volumes of silicic material locally and are common at the gabbro-sheeted dike contact. The origin of plagiogranites is poorly understood. Granophyre, which is also poorly understood, is a common texture in plagiogranites as well as other granitoids. I present …
-
Mineralogy and geochemistry associated with hydrothermal alteration of a rhyolitic hyaloclastite from Ponza Island, Italy
… argillic zone; (2) propylitic zone; (3) silicic zone; and (4) sericitic zone. The unaltered hyaloclastite is a volcanic breccia with clasts of vesiculated obsidian in a matrix of predominantly pumice lapilli. Incomplete alteration of the hyaloclastite resulted in the non-pervasive …
-
Studies on the fatty acid composition of human serum with special reference to the influence of hormones and other agents
… chromatography on a system of two columns, silicic acid and Florisil, has been elaborated for preparing samples for gas-liquid chromatographic analysis of serum lipid fatty acids.
-
Petrologic, geochemical and isotopic evolution of rhyolite lavas from the Okataina, Rotorua and Kapenga Volcanic Centres, Taupo Volcanic Zone, New Zealand
… Volcanic Centre (OVC) is a highly active modern silicic magmatic system at the northeastern end of the central Taupo Volcanic Zone, North Island, New Zealand. This study presents a set of petrographic, mineralogical, geochemical and isotopic data that focuses on the rhyolite lavas erupted from …
-
Small-volume volcanism associated with polygenetic volcanoes, Taupo Volcanic Zone, New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Earth Science at Massey University, Palmerston North, New Zealand
… Volcanic Zone (TVZ) has been the most productive silicic volcanic region in the world, with 12 silicic large-volume (35-2200 km³ DRE) caldera-forming eruptions and hundreds of predominantly silicic smaller-volume eruptions. These spatially and temporally scattered small-volume events are …
-
Origin and Diagenesis of Lacustrine Sediments of the Late Oligocene Creede Formation, Southwestern Colorado
… silicates in tuffs reflect alteration of silicic-intermediate vitric tuff within an elevated geothermal gradient (90$\sp\circ$-150$\sp\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH …
-
H and O Isotope Systematics in Volcanic Glass: Hydration Experiments and their Application to Volcanic and Hydrothermal Processes
… expand the application of H2O, δD, and δ18O in silicic volcanic glass to a greater diversity of pyroclast cooling, degassing, and rehydration histories. All pyroclasts must cool from magmatic temperatures and those at Earth’s surface, which can affect the distribution of H2O and its constituent …
-
Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
… stratified continental crust characterized by a silicic upper crust and a mafic lower crust. This thesis explores outstanding questions associated with fractional crystallization through detailed field, petrological, and geochemical studies of the Dariv Igneous Complex in Western Mongolia. The …
Page 1 of 4