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Fall Meet. Suppl., Abstract xxxxx-xx, 2003

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HR: 11:50h

AN: V31G-07

TI: Analysis of Composition and Chronology of Dome Emplacement at Black Peak, Alaska Utilizing ASTER Remote

Sensing Data and Field-Based Studies

AU: * Adleman, J N

EM: *****@***.***

AF: Department of Geology and Geophysics, Geophysical Institute, University of Alaska Fairbanks

903 Koyukuk Drive

P.O. Box 757320, Fairbanks, AK 99775-7320 United States

AU: Larsen, J F

EM: *****@**.******.***

AF: Geophysical Institute, University of Alaska Fairbanks

903 Koyukuk Drive

P.O. Box 757320, Fairbanks, AK 99775-7320 United States

AU: Ramsey, M S

EM: ******@****.***.****.***

AF: Department of Geology and Planetary Science, University of Pittsburgh

200 SRCC Building, Pittsburgh, PA 15260 United States

AU: McGimsey, R G

EM: ********@****.***

AF: U.S. Geological Survey, Alaska Volcano Observatory, 4200 University Drive, Anchoarge, AK 99508 United States

AU: Neal, C A

EM: *****@****.***

AF: U.S. Geological Survey, Alaska Volcano Observatory, 4200 University Drive, Anchoarge, AK 99508 United States

AB:

Black Peak is a 1,032m stratovolcano on the Alaska Peninsula located at 56.53 N, 158.80 W. It is one of approximately 80

historically active volcanic centers along the 2,500km long Aleutian Arc that stretches from southern Alaska to Russia's

Kamchatka Peninsula. Ash-flow tuffs from the $>$10km$^{3}$ caldera forming eruption $\sim$4,600 years ago filled the valleys

to the west and north. The ice-free caldera floor of Black Peak volcano is occupied by a complex of approximately one dozen

overlapping dacitic lava domes. During emplacement, additional domes breeched the eastern caldera wall depositing avalanches

partway down the drainages in this area. We sampled each of the domes outcropping in and around the flanks of the caldera.

Initial examination of these samples reveals a possible range in bulk composition within the dome field, with differences in

amphibole content and matrix glass alteration. Several of the domes contain dark, mafic enclaves with chilled margins,

whereas others are enclave free. The purpose of this study is to investigate how these apparent differences in dome

mineralogy and bulk composition are detected in the satellite imagery (ASTER, Landsat ETM+, Ikonos) collected for Black Peak

volcano, and apply the results to the ground based field observations in order to map changes in the physical and chemical

properties of the domes. To compare with the satellite data results, the bulk rock compositions of collected samples will be

analyzed using both laboratory thermal emission spectroscopy and XRF. Electron microprobe and standard light microscopic

petrographic techniques will also be used to determine specific details about the changes in mineralogy and chemistry within

and between each dome. The results of these analyses will be used to construct a satellite based map of the physical and

chemical properties of the dome field, augmented by careful ground validation and laboratory analyses. This combined with

other studies of Black Peak will lead to a more complete understanding of the volcanic processes that followed the caldera

formation. Further, given the significant amount of unstudied and unmapped volcanic regions in Alaska, the use of high

resolution satellite data for preliminary investigation of remote volcanoes may be a cost effective and efficient way to

assess eruption deposits along the Aleutian Arc, which might otherwise be unstudied for a number of years.

DE: 3640 Igneous petrology

DE: 5464 Remote sensing

DE: 5480 Volcanism (8450)

DE: 8429 Lava rheology and morphology

SC: Volcanology, Geochemistry, Petrology [V]

MN: 2003 Fall Meeting

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