Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core

Luigi Jovane, Fabio Florindo, Gary Acton, Christian Ohneiser, Leonardo Sagnotti, Eleonora Strada, Kenneth L. Verosub, Gary S. Wilson, Francesco Iacoviello, Richard H. Levy, Sandra Passchier

Research output: Contribution to journalArticleResearchpeer-review

Abstract

During the 2007 ANtarctic geological DRILLing (ANDRILL) campaign in the Ross Sea, Antarctica, the AND-2A core was recovered through a stratigraphic succession spanning 1,138.54 m of Neogene sedimentary rocks that include an expanded early to middle Miocene sequence. The study reported here focuses on the magnetic properties of the interval from 778.63 m below sea floor (mbsf) to 1,138.54 mbsf, which comprises a time interval spanning 1.5 Myr, from ~18.7 to ~20.2 Ma. We recognize three main pulses of increased input of magnetic materials to the drill site between 778.34–903.06, 950.55–995.78, and 1,040–1,103.96 mbsf. Trends in the magnetic mineral concentration dependent parameters mirror changes in the proportion of sediments derived from McMurdo Volcanic Group rocks. We suggest that these pulses in magnetic mineral concentration reflect changes in sediment transport processes associated with changing glacial conditions at the drill site that included (1) subglacial and grounding zone proximal settings, (2) hemipelagic and neritic conditions with abundant sediment-rich icebergs, and (3) grounding zone-distal environment that was covered by land-fast multiyear sea ice or a fringing ice shelf. The magnetic minerals record preserved in the AND-2A core supports other data that indicate a highly dynamic and variable coastal environment during the early Miocene, where glaciers retreated inland under warm climatic conditions and advanced beyond the drill site across the continental shelf when cold climate prevailed.

Original languageEnglish
Pages (from-to)2297-2312
Number of pages16
JournalJournal of Geophysical Research: Solid Earth
Volume124
Issue number3
DOIs
StatePublished - 1 Mar 2019

Fingerprint

magnetic mineral
magnetic property
Minerals
Magnetic properties
minerals
Miocene
Electric grounding
magnetic properties
Sediments
sediments
icebergs
land ice
intervals
Glaciers
Sedimentary rocks
sediment transport
glaciers
Sea ice
sea ice
sedimentary rocks

Keywords

  • ANDRILL
  • Antarctica
  • Ross Sea
  • Southern McMurdo Sound
  • early Miocene
  • magnetic properties

Cite this

Jovane, Luigi ; Florindo, Fabio ; Acton, Gary ; Ohneiser, Christian ; Sagnotti, Leonardo ; Strada, Eleonora ; Verosub, Kenneth L. ; Wilson, Gary S. ; Iacoviello, Francesco ; Levy, Richard H. ; Passchier, Sandra. / Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core. In: Journal of Geophysical Research: Solid Earth. 2019 ; Vol. 124, No. 3. pp. 2297-2312.
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abstract = "During the 2007 ANtarctic geological DRILLing (ANDRILL) campaign in the Ross Sea, Antarctica, the AND-2A core was recovered through a stratigraphic succession spanning 1,138.54 m of Neogene sedimentary rocks that include an expanded early to middle Miocene sequence. The study reported here focuses on the magnetic properties of the interval from 778.63 m below sea floor (mbsf) to 1,138.54 mbsf, which comprises a time interval spanning 1.5 Myr, from ~18.7 to ~20.2 Ma. We recognize three main pulses of increased input of magnetic materials to the drill site between 778.34–903.06, 950.55–995.78, and 1,040–1,103.96 mbsf. Trends in the magnetic mineral concentration dependent parameters mirror changes in the proportion of sediments derived from McMurdo Volcanic Group rocks. We suggest that these pulses in magnetic mineral concentration reflect changes in sediment transport processes associated with changing glacial conditions at the drill site that included (1) subglacial and grounding zone proximal settings, (2) hemipelagic and neritic conditions with abundant sediment-rich icebergs, and (3) grounding zone-distal environment that was covered by land-fast multiyear sea ice or a fringing ice shelf. The magnetic minerals record preserved in the AND-2A core supports other data that indicate a highly dynamic and variable coastal environment during the early Miocene, where glaciers retreated inland under warm climatic conditions and advanced beyond the drill site across the continental shelf when cold climate prevailed.",
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Jovane, L, Florindo, F, Acton, G, Ohneiser, C, Sagnotti, L, Strada, E, Verosub, KL, Wilson, GS, Iacoviello, F, Levy, RH & Passchier, S 2019, 'Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core', Journal of Geophysical Research: Solid Earth, vol. 124, no. 3, pp. 2297-2312. https://doi.org/10.1029/2018JB016865

Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core. / Jovane, Luigi; Florindo, Fabio; Acton, Gary; Ohneiser, Christian; Sagnotti, Leonardo; Strada, Eleonora; Verosub, Kenneth L.; Wilson, Gary S.; Iacoviello, Francesco; Levy, Richard H.; Passchier, Sandra.

In: Journal of Geophysical Research: Solid Earth, Vol. 124, No. 3, 01.03.2019, p. 2297-2312.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core

AU - Jovane, Luigi

AU - Florindo, Fabio

AU - Acton, Gary

AU - Ohneiser, Christian

AU - Sagnotti, Leonardo

AU - Strada, Eleonora

AU - Verosub, Kenneth L.

AU - Wilson, Gary S.

AU - Iacoviello, Francesco

AU - Levy, Richard H.

AU - Passchier, Sandra

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