Regular ArticleIntrasource Chemical Variability of Artefact-Quality Obsidians from the Casa Diablo Area, California
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Introducing the Peabody-Yale Reference Obsidians (PYRO) sets: Open-source calibration and evaluation standards for quantitative X-ray fluorescence analysis
2019, Journal of Archaeological Science: ReportsObsidian studies in California archaeology
2018, Quaternary InternationalCitation Excerpt :For example, a few years after its beginning at the UCLA, Fredrickson established an OHD laboratory at Sonoma State University, where thousands of hydration readings from sites throughout California and elsewhere in the far west were made from 1979 to 2002. Since the early archaeological ‘sourcing’ work of Jack (1976), Jack and Carmichael (1969), Jackson (1971, 1973, 1974), and Ericson (1977, 1981), numerous studies have been published documenting the geochemical composition of obsidians erupted within the state (Stross et al., 1976; Hughes, 1982, 1986a; 1986b, 1988; 1989, 1994a; Hamusek-McGann, 1995; Jackson, 1989; Shackley, 1994; Eerkens and Glascock, 2000; Ericson and Glascock, 2004; Hughes and Howe, 2017) and these served to ground synchronic and diachronic studies of trade, exchange, and prehistoric material conveyances (Ericson, 1981; Hughes, 1986b; Jackson, 1986; Jackson and Ericson, 1994; Hughes and Milliken, 2007; Eerkens and Spurling, 2008; Brady, 2011). Although most of the major eruptive centers in the state have been geochemically characterized (see Fig. 1), small obsidian nodule sources are discovered from time to time.
Trace element characterization of obsidian from the Transcarpathian Ukraine
2018, Journal of Archaeological Science: ReportsCitation Excerpt :Following these corrections, intensities were converted to concentration estimates by employing a least-squares calibration line established for each element from analysis of up to 30 international rock standards certified by the U.S. Geological Survey, the U.S. National Institute of Standards and Technology, the Geological Survey of Japan, the Centre de Recherches Petrographiques et Geochimiques (France), and the South African Bureau of Standards. For additional details on X-ray tube operating conditions, calibration, artifact-to-source (sensu Hughes, 1998) attribution, and element-specific measurement precision see Hughes (1994, 2015). Table 3 presents the results of geological source reference standards, and Fig. 2 shows that the Sr and Zr concentrations in this glass are significantly distinct from other varieties of Carpathian obsidian.
On the sources and uses of obsidian during the Paleolithic and Mesolithic in Poland
2018, Quaternary InternationalBeyond the colonial curtain: Investigating indigenous use of obsidian in Spanish California through the pXRF analysis of artifacts from Mission Santa Clara
2016, Journal of Archaeological Science: ReportsCitation Excerpt :Two other common sources from the North Coast Ranges are Borax Lake and Mt. Konocti, located further north in the Clear Lake Volcanic Field (Jackson, 1989). The final three sources of obsidian are found in the eastern Sierra Nevada: Bodie Hills and Casa Diablo, of which archaeologists recognize multiple subgroups including the Lookout Mountain and Sawmill Ridge localities included in this analysis (Hughes, 1994). Five nodules or fragments from each geological source were analyzed, with three separate runs on different surfaces of each piece in order to capture a range of chemical data.
Prehistoric Obsidian Conveyance in the Eastern Great Basin: Evidence from Hogup and Danger Caves, Utah
2015, Journal of Archaeological Science: Reports