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

Trace element partitioning coefficients for feldspar in high-silica rhyolite

 

Report Number: 12838

Reporting Year: 1998

Permit Number: CRLA199898-02-006

Date Received: Jan 01, 1999

Principal Investigator: Minghua Ren, Dept. of Geology, Baylor University, Waco, TX

Additional investigator(s): Dr. Don F. Parker, Mr. John White

Park-assigned Study Id. # CRLA199898-02-006

Permit Expiration Date: Jan 01, 2000

Permit Start Date: Jan 01, 1999

Study Starting Date: Jan 01, 1998

Study Ending Date: Jan 01, 2000

Study Status: Completed

Activity Type: Research

Subject/Discipline: Petrology / Mineralogy

Objectives: On August 11, 1998, we collected four samples of rhyodacite from Crater Lake National Park. These samples have been added to our data set of approximately 55 samples of silicic volcanic rocks. We hope to use these samles to better constrain the values of partition coefficients between feldspar and liquid during rhyolite petrogenesis.

Findings and Status:  We analyzed the Crater Lake samples (along with others from elsewhere) during the past winter and spring for whole-rock major and trace element chemistry. We are currently preparing mineral separates in order to analyze them, so we may calculate partition coefficients for feldspar. The four Crater Lake specimens will be housed in the geology department.

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: 2000

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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