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Full-Text Articles in Physical Sciences and Mathematics
Shared Roots: A Geochemical Investigation Of Basaltic Andesites To Understand Magmatic Cogenesis At The Middle Sister And South Sister Volcanoes, Central Oregon, Sean Francis Halstead
Shared Roots: A Geochemical Investigation Of Basaltic Andesites To Understand Magmatic Cogenesis At The Middle Sister And South Sister Volcanoes, Central Oregon, Sean Francis Halstead
WWU Honors College Senior Projects
The Middle Sister and South Sister volcanoes, near Bend, Oregon, are overlapping, active Cascade Arc stratovolcanoes which share a complex, contemporaneous eruptive history. This history is characterized by an extreme compositional diversity of lavas erupted in alternating phases of high activity from one neighboring volcano to the other, with both vents producing material ranging from basaltic andesite to rhyolite. This system is understood to be predominantly fed by basaltic andesites fractionated from partial mantle melts within the lower crust, but magma compositions are additionally impacted by mixing, assimilation, and crustal contamination while in transit to the surface. Thus, the subterranean …
An Analysis Of Clinopyroxene Reaction Rims As Assimilation Chronometers At Cinder Cone Volcano, Lassen National Volcanic Park, California, Annabelle Carozza
An Analysis Of Clinopyroxene Reaction Rims As Assimilation Chronometers At Cinder Cone Volcano, Lassen National Volcanic Park, California, Annabelle Carozza
WWU Honors College Senior Projects
Cinder Cone is a monogenetic cinder cone volcano located in Lassen National Volcanic Park, California. It erupted in 1666 CE and had three eruptive phases, each producing tephra and lava flows that ranged in style from Hawaiian (low explosivity) to Strombolian (moderate to high explosivity). This eruptive style variability at Cinder Cone was not caused by viscosity or volatile differences, and ascent rate has been proposed as a causal factor in the observed explosivity difference between phases. Ubiquitous quartz crystals are entrained within tephra and lava and were likely sourced from the assimilation of a granitic basement rock underlying the …
Using Mineral Magnetism To Characterize Compositions Of Fe-Ti Oxide Phases Of The Sulphur Creek Lava Flow (Kulshan), Elika Zilis
Using Mineral Magnetism To Characterize Compositions Of Fe-Ti Oxide Phases Of The Sulphur Creek Lava Flow (Kulshan), Elika Zilis
WWU Honors College Senior Projects
The aim of this study is to examine variations in the composition of Fe-Ti oxide minerals in the Sulphur Creek lava flow (SE margin of Kulshan), using magnetic techniques and electron microscopy. Geochemical and petrological data from these rocks dated ~9.8 ka may be a product of two distinct magma pulses (Garvey, 2002) with two distinct compositions: andesitic basalt and basalt. The composition of cubic oxides (magnetite and ulvöspinel) is influenced by the geochemistry of the crystallizing magma and can be used to provide information about the chemical evolution of these magmas, but also to help frame future paleomagnetic studies …
Silicon And Oxygen In Earth’S Core: Applications Of Machine Learning To Metal-Silicate Equilibria And Core Formation, Ruben Keane
Silicon And Oxygen In Earth’S Core: Applications Of Machine Learning To Metal-Silicate Equilibria And Core Formation, Ruben Keane
WWU Honors College Senior Projects
Within Earth’s core, light elements (Si, O, C, S, N, H) are known to make up a small fraction of the total mass of the core with respect to heavy elements. The degree to which these elements exist in the cores of terrestrial planets have geophysical and geochemical implications, most notably the presence of core convection and a geodynamo, thermal conductivity within the core, and core temperature. Comparison of the composition of chondrites to Earth’s mantle composition and the Preliminary Reference Earth Model have given an estimation of about 10 % light elements in Earth’s core. The concentrations of each …