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From Gordee et al ., 2005; in press

From Gordee et al ., 2005; in press. From Gordee et al ., 2005; in press. From Gordee et al ., 2005; in press. columnar-jointed basaltic lavas at Butler Peak. pillowed basaltic-andesite lava flow at Butler Peak. stratabound pyrite in tuffaceous mudstone.

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From Gordee et al ., 2005; in press

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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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