Beryllium isotope signatures of ice shelves and sub-ice shelf circulation

Duanne A. White, David Fink, Alexandra L. Post, Krista Simon, Ben Galton-Fenzi, Simon Foster, Toshiyuki Fujioka, Matthew R. Jeromson, Marcello Blaxell, Yusuke Yokoyama

Research output: Contribution to journalArticle

Abstract

Be isotopes are a useful tracer of sediment source and transport pathways but have not been widely tested in glacio-marine environments. We measured Be isotopes in a range of depositional environments from open marine, sub-ice shelf and subglacial settings throughout Prydz Bay, one of Antarctica's largest ice drainage systems. We find that strong sub-ice shelf and bottom current circulations can advect 10Be-rich open marine sediments into an ice shelf cavity, and 10Be-poor terrestrial sediments onto the continental shelf at the ice shelf outflow, meaning that 10Be concentrations reflect sub-ice shelf circulation patterns rather than depositional environment. However, HCl-extractable 10Be/9Be ratios can provide a more robust discrimination of sediment deposited in open marine and sub-ice shelf settings. Thus, Be isotopes are a useful tracer of both environmental setting and sub-ice shelf circulation strength in both modern and paleo-ice sheet margins.

LanguageEnglish
Pages86-95
Number of pages10
JournalEarth and Planetary Science Letters
Volume505
DOIs
Publication statusPublished - 1 Jan 2019

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beryllium isotopes
beryllium isotope
land ice
Beryllium
ice shelf
Ice
Isotopes
signatures
sediments
Sediments
isotopes
isotope
depositional environment
tracers
ice
tracer
sediment
marine environments
bottom current
Antarctic regions

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White, Duanne A. ; Fink, David ; Post, Alexandra L. ; Simon, Krista ; Galton-Fenzi, Ben ; Foster, Simon ; Fujioka, Toshiyuki ; Jeromson, Matthew R. ; Blaxell, Marcello ; Yokoyama, Yusuke. / Beryllium isotope signatures of ice shelves and sub-ice shelf circulation. In: Earth and Planetary Science Letters. 2019 ; Vol. 505. pp. 86-95.
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White, DA, Fink, D, Post, AL, Simon, K, Galton-Fenzi, B, Foster, S, Fujioka, T, Jeromson, MR, Blaxell, M & Yokoyama, Y 2019, 'Beryllium isotope signatures of ice shelves and sub-ice shelf circulation', Earth and Planetary Science Letters, vol. 505, pp. 86-95. https://doi.org/10.1016/j.epsl.2018.10.004

Beryllium isotope signatures of ice shelves and sub-ice shelf circulation. / White, Duanne A.; Fink, David; Post, Alexandra L.; Simon, Krista; Galton-Fenzi, Ben; Foster, Simon; Fujioka, Toshiyuki; Jeromson, Matthew R.; Blaxell, Marcello; Yokoyama, Yusuke.

In: Earth and Planetary Science Letters, Vol. 505, 01.01.2019, p. 86-95.

Research output: Contribution to journalArticle

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AU - White, Duanne A.

AU - Fink, David

AU - Post, Alexandra L.

AU - Simon, Krista

AU - Galton-Fenzi, Ben

AU - Foster, Simon

AU - Fujioka, Toshiyuki

AU - Jeromson, Matthew R.

AU - Blaxell, Marcello

AU - Yokoyama, Yusuke

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N2 - Be isotopes are a useful tracer of sediment source and transport pathways but have not been widely tested in glacio-marine environments. We measured Be isotopes in a range of depositional environments from open marine, sub-ice shelf and subglacial settings throughout Prydz Bay, one of Antarctica's largest ice drainage systems. We find that strong sub-ice shelf and bottom current circulations can advect 10Be-rich open marine sediments into an ice shelf cavity, and 10Be-poor terrestrial sediments onto the continental shelf at the ice shelf outflow, meaning that 10Be concentrations reflect sub-ice shelf circulation patterns rather than depositional environment. However, HCl-extractable 10Be/9Be ratios can provide a more robust discrimination of sediment deposited in open marine and sub-ice shelf settings. Thus, Be isotopes are a useful tracer of both environmental setting and sub-ice shelf circulation strength in both modern and paleo-ice sheet margins.

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KW - Be isotope mixing

KW - marine sediments

KW - meteoric Be

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KW - sub-ice shelf currents

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JF - Earth and Planetary Science Letters

SN - 0012-821X

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