Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica

Stefanie Brachfeld, Juliana Pinzon, Jason Darley, Leonardo Sagnotti, Gerhard Kuhn, Fabio Florindo, Gary Wilson, Christian Ohneiser, Donata Monien, Leah Joseph

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

The AND-1B drill core recovered a 13.57. million. year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285. m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917. m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170. m thick volcanic interval between 590 and 760. m. Above 590. m the Plio-Pleistocene glacial cycles are diatom rich and below 760. m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine pseudo-single domain and stable single domain titanomagnetite from the McMurdo Volcanic Group with a variety of textures and compositions) above 590. m. Below 760. m, the Miocene section consists of coarse-grained ilmenite and multidomain magnetite derived from Transantarctic Mountain lithologies. This may reflect ice flow patterns and the absence of McMurdo Volcanic Group volcanic centers or indicate that volcanic centers had not yet grown to a significant size. The combined rock magnetic and electron microscopy signatures of magnetic minerals serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet extent and dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica.

Original languageEnglish
Pages (from-to)420-433
Number of pages14
JournalGlobal and Planetary Change
Volume110
DOIs
StatePublished - 1 Nov 2013

Fingerprint

iron oxide
provenance
ice sheet
tracer
ice
Miocene
electron microscopy
sediment
Pleistocene
ice-rafted debris
magnetic mineral
titanomagnetite
ice flow
cyclicity
ice shelf
ilmenite
interglacial
flow pattern
rock
magnetite

Keywords

  • ANDRILL
  • Antarctic Ice Sheet
  • Electron microscopy
  • Rock magnetism
  • Sediment provenance

Cite this

Brachfeld, Stefanie ; Pinzon, Juliana ; Darley, Jason ; Sagnotti, Leonardo ; Kuhn, Gerhard ; Florindo, Fabio ; Wilson, Gary ; Ohneiser, Christian ; Monien, Donata ; Joseph, Leah. / Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica. In: Global and Planetary Change. 2013 ; Vol. 110. pp. 420-433.
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title = "Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica",
abstract = "The AND-1B drill core recovered a 13.57. million. year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285. m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917. m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170. m thick volcanic interval between 590 and 760. m. Above 590. m the Plio-Pleistocene glacial cycles are diatom rich and below 760. m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine pseudo-single domain and stable single domain titanomagnetite from the McMurdo Volcanic Group with a variety of textures and compositions) above 590. m. Below 760. m, the Miocene section consists of coarse-grained ilmenite and multidomain magnetite derived from Transantarctic Mountain lithologies. This may reflect ice flow patterns and the absence of McMurdo Volcanic Group volcanic centers or indicate that volcanic centers had not yet grown to a significant size. The combined rock magnetic and electron microscopy signatures of magnetic minerals serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet extent and dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica.",
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Brachfeld, S, Pinzon, J, Darley, J, Sagnotti, L, Kuhn, G, Florindo, F, Wilson, G, Ohneiser, C, Monien, D & Joseph, L 2013, 'Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica', Global and Planetary Change, vol. 110, pp. 420-433. https://doi.org/10.1016/j.gloplacha.2013.09.015

Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica. / Brachfeld, Stefanie; Pinzon, Juliana; Darley, Jason; Sagnotti, Leonardo; Kuhn, Gerhard; Florindo, Fabio; Wilson, Gary; Ohneiser, Christian; Monien, Donata; Joseph, Leah.

In: Global and Planetary Change, Vol. 110, 01.11.2013, p. 420-433.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica

AU - Brachfeld, Stefanie

AU - Pinzon, Juliana

AU - Darley, Jason

AU - Sagnotti, Leonardo

AU - Kuhn, Gerhard

AU - Florindo, Fabio

AU - Wilson, Gary

AU - Ohneiser, Christian

AU - Monien, Donata

AU - Joseph, Leah

PY - 2013/11/1

Y1 - 2013/11/1

N2 - The AND-1B drill core recovered a 13.57. million. year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285. m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917. m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170. m thick volcanic interval between 590 and 760. m. Above 590. m the Plio-Pleistocene glacial cycles are diatom rich and below 760. m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine pseudo-single domain and stable single domain titanomagnetite from the McMurdo Volcanic Group with a variety of textures and compositions) above 590. m. Below 760. m, the Miocene section consists of coarse-grained ilmenite and multidomain magnetite derived from Transantarctic Mountain lithologies. This may reflect ice flow patterns and the absence of McMurdo Volcanic Group volcanic centers or indicate that volcanic centers had not yet grown to a significant size. The combined rock magnetic and electron microscopy signatures of magnetic minerals serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet extent and dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica.

AB - The AND-1B drill core recovered a 13.57. million. year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285. m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917. m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170. m thick volcanic interval between 590 and 760. m. Above 590. m the Plio-Pleistocene glacial cycles are diatom rich and below 760. m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine pseudo-single domain and stable single domain titanomagnetite from the McMurdo Volcanic Group with a variety of textures and compositions) above 590. m. Below 760. m, the Miocene section consists of coarse-grained ilmenite and multidomain magnetite derived from Transantarctic Mountain lithologies. This may reflect ice flow patterns and the absence of McMurdo Volcanic Group volcanic centers or indicate that volcanic centers had not yet grown to a significant size. The combined rock magnetic and electron microscopy signatures of magnetic minerals serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet extent and dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica.

KW - ANDRILL

KW - Antarctic Ice Sheet

KW - Electron microscopy

KW - Rock magnetism

KW - Sediment provenance

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U2 - 10.1016/j.gloplacha.2013.09.015

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SN - 0921-8181

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