Holocene history of the Larsen - A Ice Shelf constrained by geomagnetic paleointensity dating

Stefanie Brachfeld, Eugene Domack, Catherine Kissel, Carlo Laj, Amy Leventer, Scott Ishman, Robert Gilbert, Angelo Camerlenghi, Lorraine B. Eglinton

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96 Scopus citations

Abstract

A sedimentary record collected from beneath the former Larsen-A Ice Shelf reveals the Holocene history of the Larsen-A region. The record begins with the transition from grounded ice to a floating ice shelf, completed by 10.7 ± 0.5 ka, and ends with the modern recession. The record contains several late Holocene diatomaceous ooze layers that suggest proximity to productive open-water events. Radiocarbon ages obtained from these sediments were complicated by the presence of detrital and reworked carbon. We have eliminated these complications and constructed a chronology for the Larsen-A Ice Shelf history via tuning of the geomagnetic field paleointensity record with a reference curve. This approach provides chronological control to sediment sequences that lack appropriate material for radiocarbon dating. Geomagnetic paleointensity features with wavelengths of 2-3 k.y. can be recognized and interhemispherically correlated, illustrating the potential to use geomagnetic paleointensity variations as a global correlation and dating tool at sub-Milankovitch time scales.

Original languageEnglish
Pages (from-to)749-752
Number of pages4
JournalGeology
Volume31
Issue number9
DOIs
StatePublished - 1 Sep 2003

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Keywords

  • Antarctic Peninsula
  • Geomagnetic paleointensity
  • Holocene
  • Larsen Ice Shelf

Cite this

Brachfeld, S., Domack, E., Kissel, C., Laj, C., Leventer, A., Ishman, S., Gilbert, R., Camerlenghi, A., & Eglinton, L. B. (2003). Holocene history of the Larsen - A Ice Shelf constrained by geomagnetic paleointensity dating. Geology, 31(9), 749-752. https://doi.org/10.1130/G19643.1