Steens Mountain volcanic field
E672555
Steens Mountain volcanic field is a large volcanic region in southeastern Oregon known for its extensive basalt flows and dramatic fault-block mountain landscapes.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Steens Mountain volcanic field canonical | 1 |
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
large igneous province
ⓘ
volcanic field ⓘ |
| age | Miocene ⓘ |
| associatedWith |
North American plate motion over a mantle plume
ⓘ
Yellowstone hotspot track NERFINISHED ⓘ |
| boundedBy | normal faults ⓘ |
| contains |
columnar jointed basalt
ⓘ
multiple stacked lava flow units ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| erosionalExpression | steep escarpments ⓘ |
| eruptionEndAge | about 15.5 million years ago ⓘ |
| eruptionStartAge | about 16.7 million years ago ⓘ |
| eruptionStyle | effusive ⓘ |
| exposedAt |
Alvord Desert margin
NERFINISHED
ⓘ
Steens Mountain NERFINISHED ⓘ |
| forms | thick basalt sequences ⓘ |
| geologicalFeature | flood basalt province ⓘ |
| geologicSignificance |
key reference section for Miocene flood basalts in the Pacific Northwest
ⓘ
records early phase of Columbia River Basalt volcanism ⓘ |
| landformType | fault-block mountain landscape ⓘ |
| lavaFlowDirection | primarily northward and westward ⓘ |
| locatedIn |
Basin and Range Province
NERFINISHED
ⓘ
Oregon ⓘ southeastern Oregon NERFINISHED ⓘ |
| magmaticSource | mantle-derived basaltic magmas ⓘ |
| maximumBasaltThickness | more than 1000 meters ⓘ |
| namedAfter | Steens Mountain NERFINISHED ⓘ |
| notableFor |
extensive basalt flows
ⓘ
well-exposed lava flow stratigraphy ⓘ |
| overlies | older volcanic and sedimentary rocks ⓘ |
| partOf | Columbia River Basalt Group NERFINISHED ⓘ |
| proximateTo |
Alvord Desert
NERFINISHED
ⓘ
Steens Mountain Wilderness NERFINISHED ⓘ |
| region | Harney County, Oregon NERFINISHED ⓘ |
| researchUse |
study of flood basalt volcanism
ⓘ
study of mantle plume–lithosphere interaction ⓘ study of paleomagnetism ⓘ |
| rockType |
basaltic andesite
ⓘ
tholeiitic basalt ⓘ |
| tectonicSetting | Basin and Range extensional regime ⓘ |
| underlies | younger Basin and Range sediments ⓘ |
| volcanismType | fissure eruptions ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.