A high resolution relative paleointensity record from the Gerlache-Boyd paleo-ice stream region, northern Antarctic Peninsula

Verónica Willmott, Eugene W. Domack, Miquel Canals, Stefanie Brachfeld

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Herein we document and interpret an absolute chronological dating attempt using geomagnetic paleointensity data from a post-glacial sediment drape on the western Antarctic Peninsula continental shelf. Our results demonstrate that absolute dating can be established in Holocene Antarctic shelf sediments that lack suitable material for radiocarbon dating. Two jumbo piston cores of 10-m length were collected in the Western Bransfield Basin. The cores preserve a strong, stable remanent magnetization and meet the magnetic mineral assemblage criteria recommended for reliable paleointensity analyses. The relative paleomagnetic intensity records were tuned to published absolute and relative paleomagnetic stacks, which yielded a record of the last ∼8500 years for the post-glacial drape. Four tephra layers associated with documented eruptions of nearby Deception Island have been dated at 3.31, 3.73, 4.44, and 6.86 ± 0.07 ka using the geomagnetic paleointensity method. This study establishes the dual role of geomagnetic paleointensity and tephrochronology in marine sediments across both sides of the northern Antarctic Peninsula.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalQuaternary Research
Volume66
Issue number1
DOIs
StatePublished - 1 Jul 2006

Fingerprint

ice stream
Postglacial
tephrochronology
shelf sediment
magnetic mineral
remanent magnetization
glacial deposit
radiocarbon dating
tephra
marine sediment
continental shelf
volcanic eruption
Holocene
basin
dating
Sediment
stack
preserve
material
method

Keywords

  • Antarctic Peninsula
  • Holocene
  • Relative paleomagnetic intensity
  • Tephrochronology

Cite this

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abstract = "Herein we document and interpret an absolute chronological dating attempt using geomagnetic paleointensity data from a post-glacial sediment drape on the western Antarctic Peninsula continental shelf. Our results demonstrate that absolute dating can be established in Holocene Antarctic shelf sediments that lack suitable material for radiocarbon dating. Two jumbo piston cores of 10-m length were collected in the Western Bransfield Basin. The cores preserve a strong, stable remanent magnetization and meet the magnetic mineral assemblage criteria recommended for reliable paleointensity analyses. The relative paleomagnetic intensity records were tuned to published absolute and relative paleomagnetic stacks, which yielded a record of the last ∼8500 years for the post-glacial drape. Four tephra layers associated with documented eruptions of nearby Deception Island have been dated at 3.31, 3.73, 4.44, and 6.86 ± 0.07 ka using the geomagnetic paleointensity method. This study establishes the dual role of geomagnetic paleointensity and tephrochronology in marine sediments across both sides of the northern Antarctic Peninsula.",
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A high resolution relative paleointensity record from the Gerlache-Boyd paleo-ice stream region, northern Antarctic Peninsula. / Willmott, Verónica; Domack, Eugene W.; Canals, Miquel; Brachfeld, Stefanie.

In: Quaternary Research, Vol. 66, No. 1, 01.07.2006, p. 1-11.

Research output: Contribution to journalArticle

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