-
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
-- Link courtesy U. S. Forest Service
-
MORE Useful Sites
-- CVO Menu, includes links to Volcano Info, Seismicity, Hydrology, etc.
-
Travel and Tourism Links - Mount Bachelor Vicinity
-- CVO Menu, includes links to Nearby Cities, Attractions, Recreation, etc.
-
Weather and Road Conditions - Mount Bachelor Vicinity
-- CVO Menu, includes links to Weather Forecasts, DOT's, Pass Reports, etc.
-
Diamond Peak Menu
|
