12695 – Origin of the Magma Chamber Under Mount Mazama

Investigator’s Annual Reports (IAR’s) for Crater Lake National Park

Origin of the Magma Chamber Under Mount Mazama


Report Number: 12695

Permit Number: CRLA1991AADD

Current Status: Checked in

Date Received: Jan 01, 1998

Reporting Year: 1991

Principal Investigator: Geoffrey Miller, National Research Council of C, Ottawa, Canada

Park-assigned Study Id. #: CRLA1991AADD

Permit Expiration Date: Jan 01, 1998

Permit Start Date: Jan 01, 1998

Study Starting Date: Jan 01, 1980

Study Ending Date: Jan 01, 1992

Study Status: Completed

Activity Type: Other

Subject/Discipline: Geology / General

Objectives: To find hard evidence supporting a proposed gas-volcanic theory for the origin of the magma chamber.

Findings and Status: Two masses of breccia have been found on the rim in the predicted region, showing strong evidence that they are of gas-volcanic origin. Several small samples of breccia from these masses have been collected and are presently being analyzed in an effort to prove this origin.

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: 5000

Full name of college or university: n/a

Annual funding provided by NPS to university or college this reporting year: 0



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