Miocene glacial dynamics recorded by variations in magnetic properties in the ANDRILL AND-2 drill core, 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

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...

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Bibliographic Details
Main Authors: 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
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2019
Subjects:
AND-2A
ANDRILL
Antarctica
Early Miocene
magnetic properties
Ross Sea
Southern McMurdo Sound
volcanoes
Drilling/drill rig
SMS
McMurdo Station
Antarctic Geological Drilling ANDRILL
Antarctic
McMurdo Sound
Levy
Antarc*
Ice Shelf
Iceberg*
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.897964
https://doi.pangaea.de/10.1594/PANGAEA.897964
Description
Summary: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.

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