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Showing 1 to 20 of 192 for “"Basaltic"”.
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Degassing Behaviour of Basaltic Open Vent Volcanoes
… and chemical changes in the gas composition in basaltic eruptions. The second problem centres around turbulent structures in vertical and wind-blown plumes. First, the injection of gas into a cylinder, which was filled with a water-glycerol mixture and particles, was investigated. These analogue …
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Magmatic processes at basaltic volcanoes: insights from the crystal cargo
… melt mixing, reactions and volatile exsolution. Basaltic volcanic systems are fed by primitive melts, and due to the rapid ascent of melts and short magma storage times, these volcanoes provide the best means of unravelling the mantle and crustal contribution to geochemical heterogeneity observed …
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Melting processes in small basaltic systems: the Auckland Volcanic Field, New Zealand
Geochemical analyses of melts erupted in small basaltic volcanic fields have the power to reveal particulars of their magmatic system from the inception of melting, to the processes that affect magmas on their ascent. The Auckland Volcanic Field (AVF) of northern New Zealand is a Quaternary …
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Direct numerical simulations of multiphase flow with applications to basaltic volcanism and planetary evolution
… of an exsolved gas phase in the conduit of basaltic volcanoes. The second part examines the solidification processes in magma oceans which entail both degassing (gas-fluid coupling) and crystallization (solid-fluid coupling). For both applications, we find that the fluid dynamics at the …
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Basaltic ʻaʻā Lava Feld Emplacement of the Intraplate Marcath Volcano (Central Nevada) from Field and LiDAR Data
Many aspects of basaltic ʻaʻā lava emplacement remain poorly understood, particularly those related to intraplate, monogenetic volcanoes. Using field and high-resolution LiDAR data, lava emplacement of the monogenetic intraplate Marcath volcano (central Nevada) was investigated in terms of surface …
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Characterising subaerial basaltic ‘a‘ā lava flows as potential geothermal reservoirs: Nordeste volcanic complex, Volcanic, São Miguel, Azores
… complex of Fogo. Neighbouring this is the basaltic Nordeste volcanic system. Few detailed studies have been published on the facies and facies architecture of Nordeste, with this study aiming to providing an analysis of the exposed ‘a‘ā lavas, specifically the cavities within. With a wide …
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Petrogenesis and evolution of alkalic basaltic magmas in a continental intraplate setting: the South Auckland Volcanic Field, New Zealand
The South Auckland volcanic field (SAVF) is situated in a continental intraplate tectonic setting and consists of silica-undersaturated alkalic basalts that erupted from about 100 centres between 1.59 and 0.51 Ma. The basalts range in composition from basanites to quartz tholeiites. Two basalt …
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Experimental simulation of Lunar Magma Ocean crystallization : insights into mantle composition and the source regions of lunar basaltic magmatism
Crystallization of the Lunar Magma Ocean has been empirically modeled and its products inferred from sample observations, but it has never been fully tested experimentally. Presented in this study is the first experimental simulation of lunar differentiation. Two end-member bulk Moon compositions …
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A field, petrologic, and geochemical study of the Callahan Lava Flow, a basaltic andesite for Medicine Lake Shield Volcano, California
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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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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Petrological insights into pre- and syn-eruptive degassing at Ambrym volcano, Vanuatu
… 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 fluctuating intensity. This is …
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Quantitative Characterization of Billowed Structures Along the Margins of Basaltic Intrusions to Determine Process and Timing of Formation: Case Studies from Big Bend National Park, Texas and 71 Gulch, Idaho
… and become incorporated into the magma. Basaltic intrusions exhibiting unique billowed structures that record magma and water-bearing sediment interaction have been examined and reconstructed in three dimensions using structure for motion (SfM) in Big Bend National Park, Texas (BBNP) and …
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The petrology and geochemistry of Precaldera Magmas, Long Valley Caldera, Eastern California
… periphery of the caldera suggest that: (I) the basaltic magmas were generated from a lherzolite partial melt modified by minor crystal fractionation (limited fractionation due to their high incompatible element content) and contamination by older sialic rocks or their derivatives (represented by …
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A geological and geophysical study of the Tendaho Graben in the Afar Depression, Ethiopia: insights into transitional continental rifting
… faults that deform the 2 km thick and ~ 2 Ma basaltic flows of the Afar Stratoids. The age of the basaltic flows becomes progressively younger inward from the boarder faults until it reaches ~30,000 years close to the rift axis. The central part of the Tendaho Graben is characterized by a 10 …
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Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, microscopic, and geochemical tools to gain a better understanding of the …
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Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, microscopic, and geochemical tools to gain a better understanding of the …
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Charakterisierung und Bilanzierung vulkanischer Sedimente im Schuttfächer Gran Canarias mit Hilfe petrophysikalischer Bohrloch- und Kernmessungen
… have been distinguished: felsic volcaniclastics, basaltic volcaniclastics, and pelagic sediments. Highly differentiated tephra layers are characterized in the logs by high K and Th concentrations, whereas basaltic volcaniclastics show the highest values for FeO und TiO2. In addition to the logs …
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