A compositionally zoned ash-flow sheet in southern Nevada

Lipman, Peter W.; Christiansen, Robert L.; O’Connor, Jack

doi:10.3133/pp524f

Cited by 103 publications

(69 citation statements)

References 12 publications

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“…Compositional changes in some studied ignimbrites (Lipman et al 1966;Schmincke 1976;Gardeweg and Ramirez 1987) are generally restricted to dacitic and rhyolitic magmas, and are believed to represent uppermost layers of large zoned magma chambers. Wright and Walker (1981) report compositions ranging from 60-73% Si02 for an ignimbrite from Mexico.…”

Section: Discussion -Inferred Model Of Eruptionmentioning

confidence: 99%

Ignimbrites of basaltic andesite and andesite compositions from Tanna, New Hebrides Arc

Robin

Eissen²,

Monzier

1994

Bulletin of Volcanology

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Abstract. Tanna island is part of a large volcanic comi plex mainly subsided below sea-level. On-land, two se-', ries of hydroclastic deposits and ignimbrites overlie the \ subaerial remains of a basal, mainly effusive volcano. The 'Older' Tanna Ignimbrite series (OTI), Late Pliocene or Pleistocene in age, consists of ash flows and ash-and scoria-flow deposits associated with fallout tephra layers, overlain by indurated pumice-flow deposits. Phreatomagmatic features are a constant characteristic of these tuffs. The 'younger' Late Pleistocene pyroclastics, the Siwi sequence, show basal phreatomagmatic deposits overlain by two successive flow units, each comprising a densely welded layer and a nonwelded ash-flow deposit. Whole-rock analyses of 17 juvenile clasts from the two sequences (vitric blocks from the phreatomagmatic deposits, welded blocks, scoriaceous bombs and pumices from the ignimbrites) show basaltic andesite and andesite compositions (SiO2 = 53-60%). In addition, 296 microprobe analyses of glasses in these clasts show a wide compositional range from 51 to 69% Sioz. Dominant compositions at -54, 56, 58.5 and 61-62% Si02 characterize the glass from the OTI. Glass compositions in the lowerphreatomagmatic -deposits from the Siwi sequence also show multimodal distribution, with peaks at SiOz=55, 57.5, 61-62 and 64% whereas the upper ignimbrite has a predominant composition at 61-62% Si02. In both cases, mineralogical data and crystal fractionation models suggest that these compositions represent the magmatic signature of a voluminous layered chamber, the compositional gradient of which is the result of fractional crystallization. During two major eruptive stages, probably related to two caldera collapses, the OTI and Siwi ignimbrites represent large outpourings from these magmatic reservoirs. The successive eruptive dynamics, from phreatomagmatic to Plinian, emphasize the role of water in initiating the eruptions, without which the mafic and intermediatê magmas probably would not have erupted.Correspondence to: Claude Robin

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Section: Discussion -Inferred Model Of Eruptionmentioning

confidence: 99%

Ignimbrites of basaltic andesite and andesite compositions from Tanna, New Hebrides Arc

Robin

Eissen²,

Monzier

1994

Bulletin of Volcanology

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“…Zones adjacent to cracks crossing the glass are slightly altered (trace of heulandite). The glass has a rhyolitic composition identical to the vitrophyres analyzed by Lipman et al (1966). Above the vitrophyre, the bulk of the member consists of welded vitric tuff.…”

Section: Bmentioning

confidence: 99%

“…drill site. A thorough study of the geology and petrology of the Topopah Spring Member was made by Lipman et al (1966). Most of the pyroclastic unit consists of vitric tuff.…”

Section: Bmentioning

confidence: 99%

Petrology of tuff units from the J-13 drill site, Jackass Flats, Nevada

Heiken¹,

Bevier²

1979

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“…thick; the slabs were then Much previous work has been done on the petrography of the Tpt. Detailed descriptions have been published for thin sections fiom outcrop (Lipman et al, 1966) and from many of the drillholes from the NNWS1 program: J-13 (Heiken and Bevier, 1979), UE-25a#l (Sykes et al, 1979;Carroll et al, 1981), USW G-l , and USW G-2 and LiE-25b#lh Broxton et al, 1982). This section relates the general petrographic characteristics of the Tpt-FR material, which will help locate the relative stratigraphic position of this outcrop with respect to the proposed repository horizon.…”

Section: Preparation Of Crushed Tuffmentioning

confidence: 99%

Petrologic and geochemical characterization of the Topopah Spring Member of the Paintbrush Tuff: outcrop samples used in waste package experiments

Knauss¹

1984

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DISCLAIMERThis report WM prepared as an accost of work sponsored by an agency of the United States finmnalfl.NoMier the United States Government nor aay agency thereof , nor aay of their iaaph>»u», malm any warranty, express or implied, or assumes my legal liability or responsi bility for the accancy, completeness, or aMfalaeis of aiy information, apparatus, product, or proem disclosed, or rcpreseaU that ill ue woald not infringe privately owned rights. Refer ence herein to any specific commercial product, process, or service by trade nunc, trademark, maasfactorer. or otherwise does not aecessariry coaslitate or imply its endorsement, recom mendation, or favoring by the United States Government or any agency thereof. The rwws end opmioas of authors expressed hereia do rot necessarily state or reflect those of the United .States Government or any agency thereof.

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A compositionally zoned ash-flow sheet in southern Nevada

Cited by 103 publications

References 12 publications

Ignimbrites of basaltic andesite and andesite compositions from Tanna, New Hebrides Arc

Ignimbrites of basaltic andesite and andesite compositions from Tanna, New Hebrides Arc

Petrology of tuff units from the J-13 drill site, Jackass Flats, Nevada

Petrologic and geochemical characterization of the Topopah Spring Member of the Paintbrush Tuff: outcrop samples used in waste package experiments

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