Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica

Wesley LeMasurier, Sung Hi Choi, Yosuke Kawachi, Sam Mukasa, Nick Rogers

Research output: Research - peer-reviewArticle

Abstract

Mt. Takahe is a large, late Quaternary trachyte shield volcano that rises through 2000 + m of the West Antarctic ice sheet. It is composed mostly of ne-trachyte, hy-ol-trachyte, and qz-trachyte flows, with subordinate basanite, intermediate rocks, and pantellerites. All rock types can be adequately modeled by fractional crystallization of basanite - the only basaltic rock exposed here. The ne-trachytes can be explained by a single stage of low-pressure fractionation near the base of the upper crust. Models of oversaturated rocks require a period of evolution at a depth of ~ 35 km, below the stability field of plagioclase, where fractionation of kaersutite and associated high pressure minerals will yield silica oversaturated residual magmas. This is then followed by a period of fractionation at a depth of ~ 3 km, where peralkalinity and Fe-enrichment are acquired. Pantellerite compositions span virtually the entire spectrum of peralkalinity, Fe-enrichment, LILE–enrichment, and SiO2 values, and seem to represent a range of residence times in upper crustal vs., upper mantle magma chambers. Mt. Takahe is unusual among Marie Byrd Land volcanoes for its geochemical anomalies. These include the lowest 143Nd/144Nd ratios in West Antarctica, and unusually high but unpredictable Ba values. These anomalies are believed to originate in a pre-85 Ma subduction mélange at the base of the lithosphere, which seems to be the source of Mt. Takahe basaltic rocks.

LanguageEnglish (US)
Pages142-162
Number of pages21
JournalLithos
Volume296-299
DOIs
StatePublished - Jan 1 2018

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volcano
rock
land
Antarctica
Volcanoes
Rocks
trachyte
fractionation
Fractionation
basanite
anomaly
shield volcano
fractional crystallization
magma chamber
upper crust
ice sheet
low pressure
upper mantle
residence time
plagioclase

Keywords

  • Fe-enrichment
  • Pantellerite
  • Residence times
  • Si-saturation

Cite this

LeMasurier, W., Choi, S. H., Kawachi, Y., Mukasa, S., & Rogers, N. (2018). Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica. Lithos, 296-299, 142-162. DOI: 10.1016/j.lithos.2017.10.014

Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica. / LeMasurier, Wesley; Choi, Sung Hi; Kawachi, Yosuke; Mukasa, Sam; Rogers, Nick.

In: Lithos, Vol. 296-299, 01.01.2018, p. 142-162.

Research output: Research - peer-reviewArticle

LeMasurier, W, Choi, SH, Kawachi, Y, Mukasa, S & Rogers, N 2018, 'Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica' Lithos, vol 296-299, pp. 142-162. DOI: 10.1016/j.lithos.2017.10.014
LeMasurier W, Choi SH, Kawachi Y, Mukasa S, Rogers N. Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica. Lithos. 2018 Jan 1;296-299:142-162. Available from, DOI: 10.1016/j.lithos.2017.10.014
LeMasurier, Wesley ; Choi, Sung Hi ; Kawachi, Yosuke ; Mukasa, Sam ; Rogers, Nick. / Dual origins for pantellerites, and other puzzles, at Mount Takahe volcano, Marie Byrd Land, West Antarctica. In: Lithos. 2018 ; Vol. 296-299. pp. 142-162
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