Age of the obsidian flow at Glass Mountain, Siskiyou County, California

Chesterman, Charles W.

doi:10.2475/ajs.253.7.418

Cited by 13 publications

(6 citation statements)

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“…4. 2.257277 during our sampling but it could have extended up to 1 m beneath our lowest sample owing to an earlier published estimated total deposit thickness at this location of about 3.6 m [Chesterman 1955]. At the time of our sampling, exposures in the quarry could be continuously traced to the contact they made with the northern obsidian flow lobe.…”

Section: Sample Collectionmentioning

confidence: 81%

“…In order to improve our understanding of how prehistorical rhyolites may have erupted, we have investigated field and geochemical characteristics of the 1060 CE eruption of Big Glass Mountain, CA, USA (BGM) [e.g. Anderson 1933;Chesterman 1955;Donnelly-Nolan et al 2007;. This explosive and effusive event produced about 0.1 km 3 of rhyolitic tephra and the most voluminous rhyolitic obsidian flow (~1 km 3 ) in Cascades volcanic province [Heiken 1978].…”

Section: Hybrid Rhyolitic Eruption At Big Glass Mountainmentioning

confidence: 99%

“…We collected tephra samples in September, 1997, from a freshly exposed, 2.5 m-tall vertical outcrop of airfall tephra in a pumice quarry ("Fouch pumice pit" [Chesterman 1955]) on the north side of the Big Glass Mountain obsidian flow (Figure 1). This sample location was selected in part based on field mapping by Heiken [1978], whose own tephra sections and isopach maps reveal a maximum deposit thickness ranging from ~3-6 m in the quarry we sampled from.…”

Section: Sample Collectionmentioning

confidence: 99%

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Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Castro¹,

Walter²

2021

Volcanica

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Eruptive dynamics of the 1060 CE rhyolitic eruption of Big Glass Mountain (BGM), USA, are investigated with field observations, hydrogen isotope and H2O content analysis of pyroclastic obsidian chips and lavas. Field relations at BGM reveal evidence for hybrid eruption, defined as synchronous explosive venting and effusive emplacement of vast obsidian lava flows. This activity is particularly well manifested by extensive breccia zones implanted within the BGM obsidian lavas, which may represent rafted tephra cones, in addition to remnants of airfall tephra on the lava. Rhyolitic obsidians collected from a 2.5-m-thick fall deposit and co-eruptive lava flow were studied by FTIR and TCEA methods to elucidate the eruption’s degassing history. The data, along with VolcDeGas program simulations, demonstrate a correlation between H2O content and H-isotopic composition (δD) that likely reflects ever-increasing amounts of volatile loss via repetitive close-system steps, best described as batched degassing.

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Section: Sample Collectionmentioning

confidence: 81%

Section: Hybrid Rhyolitic Eruption At Big Glass Mountainmentioning

confidence: 99%

Section: Sample Collectionmentioning

confidence: 99%

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Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Castro¹,

Walter²

2021

Volcanica

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“…): this was attempt to (late time of eruption of composite rhyolite-dacite flow. Pumice eruption that preceded rhyolite eruption has been dated 1107 ± 380 to 1660 ± 300 (Chesterman, 1955 (Fryxell, 1965). The occurrence will probably be a "paratype" (reference locality) for eastern area.…”

Section: Glass Mountain Series Californiamentioning

confidence: 99%

“…): this was attempt to (late time of eruption of composite rhyolite-dacite flow. Pumice eruption that preceded rhyolite eruption has been dated 1107 ± 380 to 1660 ± 300 (Chesterman, 1955). Date obtained for W-1544 was on heart of tree, rather than on outer charcoal.…”

Section: Glass Mountain Series Californiamentioning

confidence: 99%

U.S. Geological Survey Radiocarbon Dates IX

et al. 1967

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This list contains the results of measurements made during 1965 and 1966. Samples are counted in the form of acetylene gas, as previously, and ages computed on the basis of the Libby half-life, 5568 ± 30 yr. The error listed is always larger than the one-sigma statistical counting error commonly used, takes into account known uncertainty laboratory factors, but does not include external (field or atmospheric) variations.

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Tephra redeposition and mixing in a Late‐glacial hillside basin determined by fusion of clustering analyses of glass‐shard geochemistry

Pouget

Bursik

Rogova

2014

J Quaternary Science

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Two discontinuous tephra layers were discovered at Burney Spring Mountain, northern California. Stratigraphic relationships suggest that they are two distinct primary fall tephras. The geochemistries of these tephras from electron probe microanalysis were compared with those of known layers found in the area to test for potential correlations, using clustering analysis on geochemistry. In most cases, geochemical data from a tephra layer can be assigned to a single cluster, but in some cases the analyses are spread over several clusters. This spreading is a direct result of mixing and reworking of several tephra layers. The mixing, in turn, appears to be related to the influence of wind in a marshy environment.

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Age of the obsidian flow at Glass Mountain, Siskiyou County, California

Cited by 13 publications

References 0 publications

Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

U.S. Geological Survey Radiocarbon Dates IX

Tephra redeposition and mixing in a Late‐glacial hillside basin determined by fusion of clustering analyses of glass‐shard geochemistry

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