The influence of Antarctic subglacial volcanism on the global iron cycle during the Last Glacial Maximum

Silvia Frisia, LS Weyrich, J. Hellstrom, A Borsato, NR Golledge, Alexandre Anesio, P Bajo, Russell N Drysdale, PC Augustinus, C Rivard, A Cooper

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
277 Downloads (Pure)

Abstract

Marine sediment records suggest that episodes of major atmospheric CO2 drawdown during the last glacial period were linked to iron (Fe) fertilisation of subantarctic surface waters. The principal source of this Fe is thought to be dust transported from southern mid-latitude deserts. However, uncertainty exists over contributions to CO2 sequestration from complementary Fe sources, such as the Antarctic ice sheet, due to the difficulty of locating and interrogating suitable archives that have the potential to preserve such information. Here we present petrographic, geochemical and microbial DNA evidence preserved in precisely dated subglacial calcites from close to the East Antarctic Ice Sheet margin, which together suggest that volcanically-induced drainage of Fe-rich waters during the Last Glacial Maximum could have reached the Southern Ocean (SO). Our results support a significant contribution of Antarctic volcanism to subglacial transport and delivery of nutrients with implications on ocean productivity at peak glacial conditions.
Original languageEnglish
Article number15425
Number of pages9
JournalNature Communications
Volume8
DOIs
Publication statusPublished - 9 Jun 2017

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