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Filtering by: Creator Stynes, Martin J. Academic Affiliation Geosciences

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

Full Text:

AN ABSTRACT OF THE THESIS OF Martin J. Streck for the
Temporal and crustal effects on differentiation of tholeiite to calcalkaline and ferro-trachytic suites, High Lava Plains, Oregon, USA

Creator:

Streck, Martin J. and Grunder, Anita L.

Abstract:

Strongly bimodal, basalt-rhyolite volcanism of the High Lava Plains Province of Oregon followed the Middle Miocene flood basalts of the Pacific Northwest and extends to recent time. During the 8 m.y. of volcanism recorded in the central High Lava Plains, in western Harney Basin, three distinct mafic magmatic trends originate...

Resource Type:

Article

Full Text:

, Oregon, USA Martin J. Streck Department of Geology, Portland State University, Portland, Oregon 97207