Meteoric 10Be speciation in subglacial sediments of East Antarctica

Arnardóttir, Eiríka Ö.; Graly, Joseph A.; Licht, Kathy J.; Bish, David L.; Caffee, Marc W.

doi:10.1016/j.quageo.2023.101458

Cited by 1 publication

(1 citation statement)

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“…Particularly in the Lower sample, clay minerals may also derive from the aggregated grains present (Figure 2i). Clay mineral coatings are, however, occasionally adhered to sand grain surfaces that are not highly weathered (e.g., Figure 2h), suggesting either subglacial till transport or limited clay mineral formation in a subglacial environment close to the pressure‐melting point (e.g., Arnardottir et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

Byrd Ice Core Debris Constrains the Sediment Provenance Signature of Central West Antarctica

Marschalek,

Blard,

Sarigulyan

et al. 2024

Geophysical Research Letters

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Provenance records from sediments deposited offshore of the West Antarctic Ice Sheet (WAIS) can help identify past major ice retreat, thus constraining ice‐sheet models projecting future sea‐level rise. Interpretations from such records are, however, hampered by the ice obscuring Antarctica's geology. Here, we explore central West Antarctica's subglacial geology using basal debris from within the Byrd ice core, drilled to the bed in 1968. Sand grain microtextures and a high kaolinite content (∼38–42%) reveal the debris consists predominantly of eroded sedimentary detritus, likely deposited initially in a warm, pre‐Oligocene, subaerial environment. Detrital hornblende 40Ar/39Ar ages suggest proximal late Cenozoic subglacial volcanism. The debris has a distinct provenance signature, with: common Permian‐Early Jurassic mineral grains; absent early Ross Orogeny grains; a high kaolinite content; and high 143Nd/144Nd and low 87Sr/86Sr ratios. Detecting this “fingerprint” in Antarctic sedimentary records could imply major WAIS retreat, revealing the WAIS's sensitivity to future warming.

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Section: Discussionmentioning

confidence: 99%