Cascades Volcano Observatory, Vancouver, Washington

Diamond Peak, Oregon

DiamondPeak05_aerial_diamond_peak_crescent_lake_12-10-05.jpg Aerial view, Diamond Peak and Crescent Lake, Oregon, as seen from the west. USGS Photograph taken on December 10, 2005, by Mike Doukas. [medium size] ... [large size]

• Diamond Peak Shield Volcano
  -- Geographic Setting, and Geologic and Eruptive History
  Diamond Peak, the dominant landform in the Willamette Pass area, is a basaltic andesite shield approximately 15 cubic kilometers in volume. Like other shields in the area, it has a central pyroclastic cone (locally palagonitized but mostly fresh basaltic andesite cinders and glassy scoria) that is surrounded and surmounted by lava flows. Volcaniclastic rocks such as lahars and pyroclastic flows are unknown. Diamond Peak began erupting from a vent near its northern summit. A second vent later opened near the southern summit, piggy-backing its lava and tephra over the previously erupted volcanic rocks. This vent migration likely involved only a small interval of time. Diamond Peak is probably less than 100,000 years old, but is certainly older than the last glaciation, which ended approximately 11,000 years ago. -- Sherrod, 1990, IN: Wood and Kienle

[Map,25K,InlineGIF]
Central Oregon High Cascades
-- Modified from: Scott and Gardner, 1990

• Willamette National Forest -- U.S. Forest Service websites, scroll to desired Forest
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