The Wildcat Creek Tuff, Eastern Oregon: Co-eruption of Crystal-poor Rhyolite and Fe-rich Andesite with Implication for Mafic Underpinnings to Voluminous A-type Rhyolites
The Wildcat Creek Tuff is a thin (~3-12 m), rhyolite to andesitic ash-flow tuff with a minimal extent of 1500 km2 in Malheur county, eastern Oregon. The previously undated tuff yielded a single crystal, anorthoclase 40Ar/39Ar age of 15.49±0.02 Ma and thus is closely related to mafic and silicic volc...
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| Format: | Others |
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PDXScholar
2018
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| Online Access: | https://pdxscholar.library.pdx.edu/open_access_etds/4352 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=5371&context=open_access_etds |