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Explore Search: magma

Filter Total Items: 31
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Magma fragmentation and tephra deposition from a small-volume phreatomagmatic eruption: Blue Lake crater, Oregon, USA

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Lithium from magma to mine in an early Yellowstone hotspot caldera

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Horizontal transport of Picture Gorge Basalt magma through the Monument Dike Swarm determined by magnetic fabric

Topic
USGS geologist uses a UV spectrometer to detect gases from fumarole.

Volcanic Gas Monitoring Gives Clues about Magma Below

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Slab melting and magma formation beneath the southern Cascade arc

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Zircon constraints on the eruptive sequence and magma evolution of rhyolites at South Sister volcano, Oregon

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Petrology of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon

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Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon

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Compositional zonation and cumulus processes in the Mount Mazama magma chamber, Crater Lake, Oregon

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Direct evidence for the origin of low-18O silicic magmas: quenched samples of a magma chamber's partially-fused granitoid walls, Crater Lake, Oregon

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The effect of pressurized magma chamber growth on melt migration and pre-caldera vent locations through time at Mount Mazama, Crater Lake, Oregon

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Long-lived partial melt beneath Cascade volcanoes

Topic
Tripod built in the 1980's serves as a modern GPS station at Studeb...

Deformation Monitoring Measures Inflation and Deflation of the Ground Surface

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New insights into gas-driven phase segregation in andesitic enclaves from Mt. Mazama (Crater Lake), USA

Photography
GPS mast installed at station LSON, on Mount Hood

CVO geophysicist installs a GPS mast at station LSON, Mount Hood
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Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon

Research
Three Sisters volcanoes (left to right - South, Middle, and North) ...

Lava Flow Hazards at Three Sisters

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Pre-tertiary orogenic and plutonic intrusive activity in central and northeastern Oregon

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Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon

Topic
Helicopter dropping off monitoring equipment at Mount St. Helens, W...

Monitoring Cascade Volcanoes

Featured Films and Shorts
Deformation and geochemical anomalies near South Sister, Oregon

Tracking uplift near Three Sisters volcanoes, using semi-permanent GPS instruments
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Surface morphology of caldera-forming eruption deposits revealed by lidar mapping of Crater Lake National Park, Oregon- Implications for emplacement and surface modification

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Stable isotope and petrologic evidence for open-system degassing during the climactic and pre-climactic eruptions of Mt. Mazama, Crater Lake, Oregon

Photography
Seismic/GPS station YOCR, at Mount Hood

Seismic/GPS station YOCR, at Mount Hood
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Late Pleistocene granodiorite source for recycled zircon and phenocrysts in rhyodacite lava at Crater Lake, Oregon

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Deep long-period earthquakes beneath Washington and Oregon volcanoes

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Uranium and minor-element partitioning in Fe-Ti oxides and zircon from partially melted granodiorite, Crater Lake, Oregon

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Geochemistry and intrusive history of the Ashland pluton, Klamath Mountains, California and Oregon

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Late Pleistocene granodiorite beneath Crater Lake caldera, Oregon, dated by ion microprobe

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Oxygen and U-Th isotopes and the timescales of hydrothermal exchange and melting in granitoid wall rocks at Mount Mazama, Crater Lake, Oregon

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