Report Number: 23891
Permit Number: CRLA-2002-SCI-0006
Date Received: Feb 26, 2003
Reporting Year:
2002
Principal Investigator:
Ms Angela Roach,
Department of Geological
Sciences,
Brown University,
Providence, RI
Additional investigator(s):
Dr. Malcolm
Rutherford, Dr. Vicki McConnell
Park-assigned Study Id. #
CRLA-00000
Permit Expiration Date:
Aug 15, 2002
Permit Start Date:
Aug 15, 2002
Study Starting Date:
Aug 15, 2002
Study Ending Date:
May 25, 2004
Study Status:
Continuing
Activity Type:
Research
Subject/Discipline:
Geothermal / Volcanology
Objectives:
It is our objective to
investigate the post-caldera volcanism of Crater Lake caldera. In particular, we
intend to study the generation and eruption of the rhyodacite dome magma (the
youngest eruption from Crater Lake) and consider the potential for eruptions in
the future. Our emphasis will be on understanding how the rhyodacite magma was
generated, and if possible, place rate limits on this process. Petrographic and
microprobe studies of inclusions (older rock fragments) in the Wizard Island
andesite will be used to characterize the materials that were available for
melting and mixing into the andesite. We may also be able to devise experiments
to determine the amount and rate of melt generation from the inclusions.
Additional investigations will establish the pressure, temperature, oxygen
fugacity, volatile content, and conduit ascent rate of the rhyodacite magma.
These data will serve as a guide to the potential for future eruptions at Crater
Lake.
Findings and Status: In the summer of
2002, we collected 37 rock samples from Wizard Island. These samples include
andesite from each of the lobes of the island and examples of three types of
inclusions within the andesite. We also received a suite of samples of the
submarine post-caldera units from Dr. C. Bacon, USGS. We have returned both
sample suites to our laboratory and have begun preparing thin sections
(microscope slides) of selected samples.
For this study, were one or
more specimens collected and removed from the park but not destroyed during
analyses?
Yes
Funding provided this
reporting year by NPS:
0
Funding provided this
reporting year by other sources:
0
Full name of college or
university: n/a
Annual funding provided by
NPS to university or college this reporting year: 0
