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Volcanism and the Atmosphere

16 April 2014

Mount Hood

10 April 1982
The volcanic history of the Mt. Hood region in the last 15 m.y. shows a slow migration of six to eight volcanic centers from a position about 20 km west of Mt. Hood to the most recent volcanic center in the series. This migration was accompanied by the development of the structural setting visible in the Mt. Hood region today.

Coso Geothermal Area

10 May 1980
The papers in this issue present much of the data that have been accumulated on the Coso area to date; doubtless the results of further studies now in progress will be forthcoming.

Open Magmatic Systems

10 May 1986
The idea that magmatic systems are open to intermittent gains and losses of mass and energy is hardly new. Eruptive, conductive, and hydrothermally convective losses are obvious, and both wall rock assimilation and mixing of discrete magma batches are petrological ideas with long and distinguished conceptual lineages.

Mount St. Helens

10 September 1987
Mount St. Helens lies along the western front of the Cascade Range between Mount Rainier, Washington, and Mount Hood, Oregon. This is an area of transition, both geologically and geophysically.

Alkaline Volcanism in Island Arcs

10 April 1989
In December 1986, we convened a symposium at the AGU Fall Meeting to explore connections between the tectonic environments of alkaline arc magmatism and specific petrologic processes associated with their genesis. Twenty-five contributions reported occurrences of alkaline arc magmas, including modern and ancient examples from both intraoceanic and continental margin volcanic arcs.

The Yellowstone Symposium

10 September 1977
During the past decade,new interest has developed in understanding the geology and geophysics of the Yellowstone volcanic plateau and the interrelationships of its Cenozoic tectonics, late Cenozoic volcanism, widespread hydrothermal activity, and intense seismicity.

Southwestern Nevada Volcanic Field

10 May 1989
The southwestern Nevada volcanic field (SWNVF) is a classic area for studying the relationships among ash flow sheets, lava flows, calderas, and high-silica magma evolution. Ash flow sheets are fundamental to our understanding of the evolution of high-level silicic bodies because they represent a sample of a large portion of a magma body at an instant in time.