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Geological Study of Butler Peak Area: Insights from Basaltic to Rhyolite Formations

This study examines columnar-jointed basaltic lavas, pillowed basaltic-andesite lava flows, and stratabound pyrite in tuffaceous mudstone at Butler Peak. It also explores densely-welded rhyolite lapilli tuff and extensional faults near Mt. Preston. Ongoing research involves U-Pb zircon geochronology, lithogeochemical and petrographic studies, integration into the Hazelton Group tectonic framework, and recommendations for future exploration targets. For further progress, additional investigations may focus on volcanic processes, mineralogical composition, and structural analyses.

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Geological Study of Butler Peak Area: Insights from Basaltic to Rhyolite Formations

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  1. From Gordee et al., 2005; in press

  2. From Gordee et al., 2005; in press

  3. From Gordee et al., 2005; in press

  4. columnar-jointed basaltic lavas at Butler Peak

  5. pillowed basaltic-andesite lava flow at Butler Peak

  6. stratabound pyrite in tuffaceous mudstone

  7. From Gordee et al., 2005; in press

  8. very densely-welded rhyolite lapilli tuff

  9. accretionary lapilli in rhyolite lapilli tuff

  10. From Gordee et al., 2005; in press

  11. synvolcanic (?) extensional fault south of Mt. Preston

  12. Rivers Peak/Mount Preston area A – normal fault B – rhyolite domes C – ca. 150 Ma (?) quartz monzonite stock

  13. rhyolite dome carapace breccia south of Mt. Preston

  14. From Gordee et al., 2005; in press

  15. Geochemistry

  16. Geochemistry, cont’d.

  17. Geochemistry, cont’d. *rhyolite samples from this study area resemble FIIIa-type rhyolites, as defined by Lesher et al., 1985

  18. Ongoing Research • U-Pb zircon geochronology • Lithogeochemical studies • Petrographic and volcanological studies • Integrate results into regional Hazelton Group tectonic framework • Recommend targets for future exploration Question: What else should be done?

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