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Filtering by: Creator Hooper, Rick Creator Grunder, Anita L.

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
Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age-progressive rhyolites

Creator:

Ford, Mark T., Grunder, Anita L., and Duncan, Robert A.

Abstract:

Multiple episodes of Oligocene and younger silicic volcanism are represented in the high lava plateau of central and southeastern Oregon. From 12 Ma to Recent, volcanism is strongly bimodal with nearly equal volumes of basalt and rhyolite. It is characterized by moderate to high silica (SiO₂ > 72 wt. %)...

Resource Type:

Article

Full Text:

) (Figure 1) [Smith and Luedke, 1984; Pierce and Morgan, 1992; Hooper et al., 2002; Shoemaker and Hart, 2002