Report Number: 12839
Reporting Year: 1998
Permit Number: CRLA1998BACO
Date Received: Jan 01, 1999
Principal Investigator:
Charles Bacon,
U.S. Geological Survey,
U.S.G.S.,
Menlo park, CA
Additional investigator(s):
Duane Champion
Park-assigned Study Id. #
CRLA1998BACO
Permit Expiration Date:
Jan 01, 2000
Permit Start Date:
Jan 01, 1999
Study Starting Date:
Jan 01, 1997
Study Ending Date:
Jan 01, 1999
Study Status:
Completed
Activity Type:
Research
Subject/Discipline:
Geology / General
Objectives:
To document the growth and
evolution of Mount Mazama, the volcanic complex in which Crater Lake caldera
lies, in order to define processes that led to an accumulation of a large volume
of silicic magma in the upper crust. Secondary goals are to further knowledge of
catastrophic eruptions, such as the one that resulted in the collapse of the
caldera.
Findings and Status: The 1:24,000
scale geologic map of Mount Mazama and Crater Lake caldera is being prepared for
publication. Digital files of the geologic map and all eleven geologic panoramas
of the caldera walls are being edited in ArcInfo. These will be published in
color and the map also will be released in digital form. A paper on the slip
rate on the West Klamath Lake fault zone near Crater Lake was accepted for
publication in the journal, "Geology". Renee Bourgeois, University of Oregon,
completed her Masters thesis project on the Cleetwood pumice fall deposit under
the direction of Prof. K.V. Cashman and C.R. Bacon, and gave a poster
presentation at the Fall meeting of the American Geophysical Union in San
Francisco. Dr. Charles Mandeville, American Museum of Natural History, gave a
talk at the Fall AGU meeting on sulfur isotope determinations in volcanic rocks
from Crater Lake. Dr. Marvin Lanphere, USGS, and co-workers measured several new
K-Ar ages of volcanic rocks from Crter Lake, bringing the total to 106. These
data will be published in a companion paper to the geologic map. No field work
was conducted in 1998 and no new specimens were collected.
For this study, were one or
more specimens collected and removed from the park but not destroyed during
analyses?
No
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
