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Filtering by: Creator Poinar, George O., Jr. Non-Academic Affiliation Oregon Explorer Resource Type Article

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:

source of the Rattlesnake Tuff. Two vents have been dated at 5.4 (HBA3) and 2.4 Ma (JR-92-21) (Table 1