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Luigi, Jovane; Florindo, Fabio; Acton, Gary D; Ohneiser, Christian; Sagnotti, Leonardo; Strada, Eleonora; Verosub, Kenneth Lee; Wilson, Gary S; Iacoviello, Francesco; Levy, Richard H; Passchier, Sandra (2019): Miocene glacial dynamics recorded by variations in magnetic properties in the ANDRILL AND-2 drill core [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.897964, Supplement to: Jovane, Luigi; Florindo, Fabio; Acton, Gary D; Ohneiser, Christian; Sagnotti, Leonardo; Strada, Eleonora; Verosub, Kenneth Lee; Wilson, Gary S; Iacoviello, Francesco; Levy, Richard H; Passchier, Sandra (2019): Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL‐2A Drill Core. Journal of Geophysical Research: Solid Earth, 124(3), 2297-2312, https://doi.org/10.1029/2018JB016865

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Published: 2019-01-31 • DOI registered: 2020-04-21

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Abstract:
During the 2007 ANDRILL campaign in the Ross Sea, Antarctica, the AND-2A core was recovered through a stratigraphic succession spanning 1138.54 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 meters below sea floor (mbsf) to 1138.54 mbsf, which comprises a time interval spanning 1.5 Myr, from ~18.7 to ~20.2 Ma. We recognise three main pulses of increased input of magnetic materials to the drill site between 778.34 - 903.06, 950.55 - 995.78 and 1040 - 1103.96 mbsf. Trends in magnetic mineral concentration dependent parameters mirror changes in the proportion of sediments derived from McMurdo Volcanic Group rocks. We suggest 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, (3) grounding zone-distal environment that was covered by land-fast multi-year 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.
Keyword(s):
AND-2A; ANDRILL; Antarctica; Early Miocene; magnetic properties; Ross Sea; Southern McMurdo Sound; volcanoes
Project(s):
Antarctic Geological Drilling (ANDRILL)
Coverage:
Latitude: -77.758141 * Longitude: 165.276765
Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00
Event(s):
AND-2A * Latitude: -77.758141 * Longitude: 165.276765 * Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00 * Elevation: -380.0 m * Recovery: 1138.54 m * Location: McMurdo Sound * Campaign: SMS (Southern McMurdo Sound) * Basis: McMurdo Station * Method/Device: Drilling/drill rig (DRILL) * Comment: Coring site is located ~25 km from the United States' McMurdo Station and from New Zealand's Scott Base on a 8.5 m thick floating sea-ice platform.
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Luigi, J; Florindo, F; Acton, GD et al. (2019): ARM intensity of the Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897957
  2. Luigi, J; Florindo, F; Acton, GD et al. (2019): ARM intensity/magnetic susceptibility ratio of the Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897956
  3. Luigi, J; Florindo, F; Acton, GD et al. (2019): Mr/Ms and Bcr/Bc measurements in the Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897959
  4. Luigi, J; Florindo, F; Acton, GD et al. (2019): Nb concentration in the Miocene section of Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897961
  5. Luigi, J; Florindo, F; Acton, GD et al. (2019): Magnetic susceptibility and magnetization saturation in the Miocene section of Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897963
  6. Luigi, J; Florindo, F; Acton, GD et al. (2019): McMurdo volcanics in the Miocene section of Miocene section of ANDRILL AND-2A drill core. https://doi.org/10.1594/PANGAEA.897960