Journal article

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

Silvia Frisia, Laura S Weyrich, John Hellstrom, Andrea Borsato, Nicholas R Golledge, Alexandre M Anesio, Petra Bajo, Russell N Drysdale, Paul C Augustinus, Camille Rivard, Alan Cooper

Nature Communications | Nature Research | Published : 2017

Abstract

Marine sediment records suggest that episodes of major atmospheric CO2 drawdown during the last glacial period were linked to iron (Fe) fertilization 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..

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Grants

Awarded by Australian Synchrotron


Funding Acknowledgements

Access to the European Synchrotron Radiation Facility (ESRF) was supported by the Australian Synchrotron AS-IA104-ESRF-EC794 grant. Murielle Salome, Giulia Veronesi and Vanessa Johnston provided valuable assistance at beamline ID21 of ESRF. Alfredo Martin-Garcia provided the ODP 1090 Fe fluxes, Barbara Stenni provided the EDC and EDML synchronized temperature records and Roberto Udisti shared knowledge on F records and measurements in EDC. Olivier Rey-Lescure is acknowledged for cartography. The Boggs Valley calcites were collected by P.A. during Antarctica New Zealand Event K015, with logistical support from Antarctica New Zealand and the Italian Antarctic Program (PNRA). University of Auckland Research Committee grants provided funding to assist the fieldwork.