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Geology And Geochronology Of The East Dome Complex Within The Hog Heaven Volcanic Field, Flathead County, Montana, Ethan Coppage
Geology And Geochronology Of The East Dome Complex Within The Hog Heaven Volcanic Field, Flathead County, Montana, Ethan Coppage
Graduate Theses & Non-Theses
This study describes the style and timing of volcanic activity and mineralization in the East Dome Complex (EDC) of the 55-km2 Eocene-Oligocene Hog Heaven Volcanic Field (~36-30 Ma; HHVF) located in northwestern Montana. The HHVF consists of three NE-aligned, predominantly high-K rhyodacitic dome complexes (1.8-4.9 wt. % K2O; 63.2-72.9 wt. % SiO2) formed near the crest the Purcell Anticlinorium, a major Cordilleran fold-thrust belt structure deforming metasedimentary rocks of the Mesoproterozoic Belt Supergroup. Dome emplacement was controlled by a NE-striking fault associated with a pull-apart basin formed between two overlapping, NW-trending dextral oblique-slip faults. The objective of this study is …