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From Gordee et al ., 2005; in press PowerPoint PPT Presentation


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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

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


From gordee et al 2005 in press

pillowed basaltic-andesite lava flow at Butler Peak


From gordee et al 2005 in press

stratabound pyrite in tuffaceous mudstone


From gordee et al 2005 in press

From Gordee et al., 2005; in press


From gordee et al 2005 in press

very densely-welded rhyolite lapilli tuff


From gordee et al 2005 in press

accretionary lapilli in rhyolite lapilli tuff


From gordee et al 2005 in press

From Gordee et al., 2005; in press


From gordee et al 2005 in press

synvolcanic (?) extensional fault south of Mt. Preston


From gordee et al 2005 in press

Rivers Peak/Mount Preston area

A – normal fault

B – rhyolite domes

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


From gordee et al 2005 in press

rhyolite dome carapace breccia south of Mt. Preston


From gordee et al 2005 in press

From Gordee et al., 2005; in press


From gordee et al 2005 in press

Geochemistry


From gordee et al 2005 in press

Geochemistry, cont’d.


From gordee et al 2005 in press

Geochemistry, cont’d.

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

as defined by Lesher et al., 1985


From gordee et al 2005 in press

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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