A Path to Quantitative Interpretation of Antarctic Sediment Provenance Records

Marschalek, James; Gasson, Edward; Flierdt, Tina van de; Hillenbrand, Claus‐Dieter; Siegert, Martín J.

doi:10.5194/egusphere-egu22-1667

Cited by 2 publications

(1 citation statement)

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“…This study produced various data sets which have been deposited in Zenodo. These comprise: Nd and Sr isotope compositions (Marschalek and van de Flierdt, 2023; https://doi.org/10.5281/zenodo.10021918), clay mineral assemblages (Ehrmann & Marschalek, 2023; https://doi.org/10.5281/zenodo.10033271), zircon U‐Pb ages (Thomson et al., 2023; https://doi.org/10.5281/zenodo.10022313), apatite fission track data (Thomson et al., 2023; https://doi.org/10.5281/zenodo.10022114), hornblende 40 Ar/ 39 Ar ages (Hemming & Marschalek, 2023; https://doi.org/10.5281/zenodo.10022028). These data are all freely accessible and licensed under Creative Commons Attribution 4.0.…”

Section: Data Availability Statementmentioning

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: Data Availability Statementmentioning

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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Geologically constrained 2-million-year-long simulations of Antarctic Ice Sheet retreat and expansion through the Pliocene

Halberstadt,

Gasson,

Pollard

et al. 2024

Nat Commun

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Pliocene global temperatures periodically exceeded modern levels, offering insights into ice sheet sensitivity to warm climates. Ice-proximal geologic records from this period provide crucial but limited glimpses of Antarctic Ice Sheet behavior. We use an ice sheet model driven by climate model snapshots to simulate transient glacial cyclicity from 4.5 to 2.6 Ma, providing spatial and temporal context for geologic records. By evaluating model simulations against a comprehensive synthesis of geologic data, we translate the intermittent geologic record into a continuous reconstruction of Antarctic sea level contributions, revealing a dynamic ice sheet that contributed up to 25 m of glacial-interglacial sea level change. Model grounding line behavior across all major Antarctic catchments exhibits an extended period of receded ice during the mid-Pliocene, coincident with proximal geologic data around Antarctica but earlier than peak warmth in the Northern Hemisphere. Marine ice sheet collapse is triggered with 1.5 °C model subsurface ocean warming.

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A Path to Quantitative Interpretation of Antarctic Sediment Provenance Records

Cited by 2 publications

References 0 publications

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

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

Geologically constrained 2-million-year-long simulations of Antarctic Ice Sheet retreat and expansion through the Pliocene

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