Report Number: 12847
Reporting Year: 1999
Permit Number: CRLA199902-006
Current Status: Checked in
Date Received: Jan 01, 2000
Principal Investigator:
Charles W. Mandeville,
Department of Planetary Sciences,
American Museum of Natural History,
New York, NY
Additional investigator(s):
Dr. Charles R. Bacon,
Dr. James D. Webster
Park-assigned Study Id. #
CRLA199902-006
Permit Expiration Date:
Jan 01, 2000
Permit Start Date:
Jan 01, 2000
Study Starting Date:
Jan 01, 1999
Study Ending Date:
Jan 01, 2000
Study Status:
Completed
Activity Type:
Research
Subject/Discipline:
Geothermal / Volcanology
Objectives:
1. 20-25 rock samples from
Cleetwood pumice fall, Llao Rock pumice fall and Climactic pumice fall and
ignimbrite. Total not to exceed 25 specimens (20-40 grams each).;2. 1-2 Crater
Lake water samples (1-2 liter volume).
Findings and Status: As of 12/16/99
we have entered into the second year of our study of sulfur degassing during the
climactic and Pre-Climactic Eruption of Mt. Mazama. Bulk sulfur extraction via
KIBA reagent was completed on 24 samples of Climactic rock samples during the
period of 7/19-23/99. Sulfur concentrations in these samples range from 39 ppm
to 244ppm. Extracted sulfur from these samples is presently in the form of
silver sulfide Ag2S) and will be analyzed for its isotopic composition(34S/32S)
by MILES laser probe in collaboration with Dr. Bruce Taylor of the Geological
Survey of Canada during 2/00. Twenty rock samples from Mt. Mazama were collected
during our first field season in CRLA NP during 9/13-22/99. Three water samples
were taken at Vidae Falls, Cleetwood Cove, and a deep water sample was collected
in collaboration with Dr. Robert Collier of OR St. Univ. Surfur from these water
samples will be extrqacted via ion exchange resin and measured for its isotopic
composition at the Geological Survey of Canada. ;Bulk surfur extractions on
these samples was completed during 11/12-17/99 at the Univ. of Ottowa. Sulfur
concentrations determined in ;these samples range from 30 ppm to 160 ppm and the
silver sulfide will be analyzed for isotopic composition during the period
Feb.-March 2000. ;Hydrogen isotopic analyses of pure glass ;separates from these
20 samples will be done ;during the months of Mar.-Apr. 2000.;Electron
micorprobe analyses of the sulfur concentration in glass inclusions has been
completed at the American Museum of Natural History. Sulfur concentrations in
Mazama rhyodacitic glalss inclusions reach a max. of 450 ppm, thus indicating
extensive (70-94%) sulfur degassing when compared to sulfur concentrations
determined in pure matrix glass separates via bulk extraction. Chlorine
concentrations in rhyodacitic inclusions reaches a maximum of approx. 3500 ppm
indication 50% degassing of Cl. Sulfur concentrations in andesitic glass
inclusions from andesitic scoria reach a max. of 2700 ppm and chorine
concentrations range up to 4000 ppm. Sulfur degassing from this magmatic
component was at least 98-99%. I have recently begun Infra-red spectroscopic
studies of dissolved water and carbon dioxide in Mazama glass inclusions. A
minimum estimate of sulfur degassing during the Climactic eruption of Mt. Mazama
is 3.1 x 10 (to the 13th power)gS.
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
