1976
DOI: 10.3133/pp972
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Correlation of late Cenozoic tuffs in the central Coast Ranges of California by means of trace and minor-element chemistry

Abstract: Deformed late Cenozoic tuffs in the central Coast Ranges of California have been correlated by means of trace-and minorelement chemistry of volcanic glass, supported by potassium-argon dates, petrographic data, and stratigraphy. Cluster analysis of the chemical data indicates that four orders of chemical variability exist in the trace-and minor-element composition of volcanic glass. The greatest differences are between tephra of silicic and intermediate composition. Considering silicic tephra alone, the greate… Show more

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Cited by 64 publications
(113 citation statements)
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“…We disaggregated and sieved tephra samples and separated glass and phenocrysts using methylene iodide-acetone solutions and a magnetic separator (Sarna-Wojcicki, 1976;Sarna-Wojcicki et al, 1979, 1984a. We analyzed glass separates by instrumental neutron-activation (INAA) for 20 elements, electron microprobe (EMA) for 12 elements, and energy-dispersive X-ray fluorescence (XES) for 13 elements.…”
Section: Methodsmentioning
confidence: 99%
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“…We disaggregated and sieved tephra samples and separated glass and phenocrysts using methylene iodide-acetone solutions and a magnetic separator (Sarna-Wojcicki, 1976;Sarna-Wojcicki et al, 1979, 1984a. We analyzed glass separates by instrumental neutron-activation (INAA) for 20 elements, electron microprobe (EMA) for 12 elements, and energy-dispersive X-ray fluorescence (XES) for 13 elements.…”
Section: Methodsmentioning
confidence: 99%
“…Chemical compositions of volcanic glass samples were matched using the similarity coefficient (SIMANAL) (Borchardt et al, 1972;Sarna-Wojcicki, 1976;Sarna-Wojcicki et al, 1979) and standard deviations of averages of ratios of element concentrations (RATIONAL) (SarnaWojcicki et al, 1984a) (Fig. 6).…”
Section: Methodsmentioning
confidence: 99%
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“…At least two rhyo'itic flows are stacked above this basal welded tuff at Mount George. Sarna-Wojcicki (1976) referred to the flow at locality S5 as dacite and the flow at location GHC-176 (located 3 km to the east of S5) as rhyolite. Based on mappin-j by Fox (see Sims and others, 1973) and unpublished analyt'cal data, the two localities seem to be discontinuous erosional remnants of the same flow.…”
Section: Upper Membermentioning
confidence: 99%
“…As well as studies on distal tephra deposits preserved in sediments, and in soils or palaeosols, new laboratory methods for characterizing the glass-shard and crystal (mineral) components of tephra deposits were being developed in a period of substantial technical advancement (e.g. Kohn 1970;Sarna-Wojcicki 1976;Westgate & Gorton 1981;Beaudoin & King 1986). These methods included the innovative use of the electron microprobe, developed mainly through the 1970s and 1980s, to obtain major element compositions of individual glass shards rather than bulk samples (Smith & Westgate 1968;Froggatt 1983Froggatt , 1992Hunt & Hill 1996).Its advent in 1968 a stroke of brilliance, the microprobe method for glass analysis, initially criticised by some 'traditional' volcanic petrologists and geo-analysts, has been widely adopted today as the cornerstone analytical technique in tephra studies used alongside stratigraphic, chronological, and mineralogical data to help enable correlations to be made (Froese et al 2008a;Lowe 2011).…”
Section: Tephrochronological Advancesmentioning
confidence: 99%