2011 GSA Annual Meeting in Minneapolis (912 October 2011)
Paper No. 89-8
Presentation Time: 9:50 AM-10:05 AM

CATHODOLUMINESCENCE OF FELDSPAR MINERALS

HASBROUCK, Kristen H.1, BROKUS, Sarah1, SILLETTI, Danielle2, BUSCAGLIA, JoAnn3, and PEASLEE, Graham F.4, (1) Geological and Environmental Sciences, Hope College, 35 E 12th Street, Holland, MI 49423, kristen.hasbrouck@hope.edu, (2) Chemistry Department, Hope College, 35 E 12th Street, Holland, MI 49423, (3) Counterterrorism and Forensic Science Research Unit, FBI Laboratory, Building 12, Quantico, VA 22135, (4) Chemistry and Geological and Environmental Sciences, Hope College, Chemistry Dept, 35 E. 12th St, Holland, MI 49423

A collection of North American feldspar minerals were examined using cold-cathode cathodoluminescence (CL) spectroscopy. The resulting spectra were fit and characteristic peaks were associated with each feldspar phase; these peaks are independent of geographic origin. Most of these peaks have been previously assigned to luminescent centers, such as Mn2+ and Fe3+, and structural defects. While the magnitude of these peaks depends on many co-factors, the peak centroids are shown to be consistent for replicate samples from any given location. These peak centroids are also found to vary measurably from location to location, most likely due to stoichiometric changes in the Na-K-Ca composition of the feldspars. A relationship between CL peak centroid and lattice size changes for both alkali and plagioclase feldspars has been reported previously. This novel application of an older luminescence technique yields encouraging results for the practical application of feldspar identification and provenance attribution in forensic geology.

2011 GSA Annual Meeting in Minneapolis (912 October 2011)
General Information for this Meeting
Session No. 89
Spectroscopy for the Geosciences in the 21st Century
Minneapolis Convention Center: Room 102D-F
8:00 AM-12:00 PM, Monday, 10 October 2011

Geological Society of America Abstracts with Programs, Vol. 43, No. 5, p. 233

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