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Volatile trace metals deposited in ice as soluble volcanic aerosols during the 17.7.ka eruptions of Mt Takahe, West Antarctic Rift

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Mason, E 
McConnell, JR 

Abstract

Volatile metals are emitted at significant rates as gases and particulates from volcanoes, although their speciation, bioreactivity and longevity during atmospheric transport are essentially unknown. Ice cores provide detailed yet largely unexplored long-term records of volcanogenic volatile metals in air and precipitation. Here we evaluate the source and speciation of volatile metals (cadmium, lead, bismuth, and thallium) in Antarctic ice cores from the massive, halogen-rich and sulfur-poor ~17.7 ka eruptions of Mt. Takahe, West Antarctic Rift. We show that these volatile, chalcophile metals were transported to the ice core as soluble aerosol, derived from magma degassing, in contrast to lithophile elements in the ice core that were transported as silicate ash. We use correlation analysis and chemical speciation modelling of the chlorine-rich volcanic plume to show that the volcanic metals cadmium, lead and bismuth were likely transported as water-soluble chloride aerosols in the atmosphere before they were scavenged from the plume by ice, water or ash and deposited onto the ice within 400 km of the vent. Our findings show that as well as recording trace metals sourced from much more distal regions, ice cores from Antarctica also record clear signatures of regional continental volcanism in the form of chloride aerosol.

Description

Keywords

degassing, volatile metals, ice core, stratosphere, volcanic

Journal Title

Frontiers in Earth Science

Conference Name

Journal ISSN

2296-6463
2296-6463

Volume Title

Publisher

Frontiers Media
Sponsorship
Natural Environment Research Council (NE/S00436X/1)
EPSRC (1943898)
EM was funded by an UKRI EPSRC studentship during this work. The WD ice core was analysed at the Desert Research Institute with funding from US National Science Foundation to JRM (grants 0538427, 0839093, and 1142166). Clare Hall, Cambridge provided additional support to JRM through the Sir Nicholas Shackleton Fellowship. ME acknowledges UKRI funding through the NERC grant V-Plus NE/S00436X/1.
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