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Filtering by: Creator Staudigel, H. Academic Affiliation Geosciences Decade 1990-1999

Hydrothermal alteration of a supra-subduction zone ophiolite analog, Tonga, Southwest Pacific

Creator:

Kelman, Melanie C.

Abstract:

The basement of the Tonga intraoceanic forearc comprises Eocene arc volcanic crust formed during the earliest phases of subduction. Volcanic rocks recovered from the forearc include boninites and arc tholeiites, apparently erupted into and upon older mid-oceanic ridge tholeiites. Rock assemblages suggest that the forearc basement is a likely analog...

Resource Type:

Masters Thesis

Full Text:

seawater in the volcanic section can continue for tens of millions of years (Staudigel et al., 1981
Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

Creator:

Streck, Martin J.

Abstract:

The Rattlesnake Ash-Flow Tuff erupted 7.05±0.01 Ma from the western Harney Basin, southeastern Oregon. The location of the vent area is inferred based on vent-ward increases in size of pumices, in degree of welding, and in degree of post-emplacement crystallization. Today's outcrops cover 9000 km2 and estimated original outcrop coverage...

Resource Type:

Dissertation