Non-destructive EDXRF Analyses of Archaeological Basalts
Non-destructive energy-dispersive X-ray Fluorescence (EDXRF) analysis measures the interiors and exteriors of samples. We examine the effects of chemical weathering, surface contamination by phosphates, surface morphology, and textural variation on archaeological basalt. Major element data are most affected by these factors, altering both the measured chemical composition and the precision of the analyses. Measured chemical composition of trace elements (Rb, Sr, Y, Zr, and Nb) are less affected. These factors increase the measured variation in sample populations.
KeywordsTiO2 SiO2 Magnesium Covariance Transportation
Acquisition of the EDXRF at the University of Hawai’i-Hilo was supported by a major research instrumentation grant from the National Science Foundation (BCS 0317528). We gratefully acknowledge Randy Cone (ThermoNoran), Craig Skinner (Northwest Research Obsidian Studies Laboratory), and Steven Shackley (UC-Berkeley) for their assistance with EDXRF methods. We also thank Melanie Mintmier and Haleakala National Park for obtaining samples.
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