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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. 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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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


From Gordee et al., 2005; in press


very densely-welded rhyolite lapilli tuff


accretionary lapilli in rhyolite lapilli tuff


From Gordee et al., 2005; in press


synvolcanic (?) extensional fault south of Mt. Preston


Rivers Peak/Mount Preston area

A – normal fault

B – rhyolite domes

C – ca. 150 Ma (?) quartz monzonite stock


rhyolite dome carapace breccia south of Mt. Preston


From Gordee et al., 2005; in press


Geochemistry


Geochemistry, cont’d.


Geochemistry, cont’d.

*rhyolite samples from this study area resemble FIIIa-type rhyolites,

as defined by Lesher et al., 1985


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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