Evidence of an active volcanic heat source beneath the Pine Island Glacier

Brice Loose, Alberto C. Naveira Garabato, Peter Schlosser, William J. Jenkins, David Vaughan, Karen J. Heywood

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3 Scopus citations

Abstract

Tectonic landforms reveal that the West Antarctic Ice Sheet (WAIS) lies atop a major volcanic rift system. However, identifying subglacial volcanism is challenging. Here we show geochemical evidence of a volcanic heat source upstream of the fast-melting Pine Island Ice Shelf, documented by seawater helium isotope ratios at the front of the Ice Shelf cavity. The localization of mantle helium to glacial meltwater reveals that volcanic heat induces melt beneath the grounded glacier and feeds the subglacial hydrological network crossing the grounding line. The observed transport of mantle helium out of the Ice Shelf cavity indicates that volcanic heat is supplied to the grounded glacier at a rate of ~ 2500 ± 1700 MW, which is ca. half as large as the active Grimsvötn volcano on Iceland. Our finding of a substantial volcanic heat source beneath a major WAIS glacier highlights the need to understand subglacial volcanism, its hydrologic interaction with the marine margins, and its potential role in the future stability of the WAIS.

Original languageEnglish (US)
Article number2431
JournalNature communications
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2018

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ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Loose, B., Naveira Garabato, A. C., Schlosser, P., Jenkins, W. J., Vaughan, D., & Heywood, K. J. (2018). Evidence of an active volcanic heat source beneath the Pine Island Glacier. Nature communications, 9(1), [2431]. https://doi.org/10.1038/s41467-018-04421-3