Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core
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 o...
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ftmontclairstuni:oai:digitalcommons.montclair.edu:earth-environ-studies-facpubs-1416 2023-07-23T04:15:38+02:00 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 2019-03-01T08:00:00Z application/pdf https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/417 https://doi.org/10.1029/2018JB016865Final https://digitalcommons.montclair.edu/context/earth-environ-studies-facpubs/article/1416/viewcontent/Miocene_Glacial_Dynamics_Recorded_by_Variations_in.pdf unknown Montclair State University Digital Commons https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/417 doi:10.1029/2018JB016865Final published version Open https://digitalcommons.montclair.edu/context/earth-environ-studies-facpubs/article/1416/viewcontent/Miocene_Glacial_Dynamics_Recorded_by_Variations_in.pdf Department of Earth and Environmental Studies Faculty Scholarship and Creative Works ANDRILL Antarctica Ross Sea Southern McMurdo Sound early Miocene magnetic properties Earth Sciences Environmental Sciences text 2019 ftmontclairstuni https://doi.org/10.1029/2018JB016865Final 2023-07-03T21:53:28Z 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. Text Antarc* Antarctic Antarctica Ice Shelf Iceberg* McMurdo Sound Ross Sea Sea ice Montclair State University Digital Commons Antarctic Ross Sea McMurdo Sound |
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Open Polar |
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Montclair State University Digital Commons |
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ftmontclairstuni |
language |
unknown |
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ANDRILL Antarctica Ross Sea Southern McMurdo Sound early Miocene magnetic properties Earth Sciences Environmental Sciences |
spellingShingle |
ANDRILL Antarctica Ross Sea Southern McMurdo Sound early Miocene magnetic properties Earth Sciences Environmental Sciences 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 |
topic_facet |
ANDRILL Antarctica Ross Sea Southern McMurdo Sound early Miocene magnetic properties Earth Sciences Environmental Sciences |
description |
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. |
format |
Text |
author |
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 |
author_facet |
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 |
author_sort |
Jovane, Luigi |
title |
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core |
title_short |
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core |
title_full |
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core |
title_fullStr |
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core |
title_full_unstemmed |
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core |
title_sort |
miocene glacial dynamics recorded by variations in magnetic properties in the andrill-2a drill core |
publisher |
Montclair State University Digital Commons |
publishDate |
2019 |
url |
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/417 https://doi.org/10.1029/2018JB016865Final https://digitalcommons.montclair.edu/context/earth-environ-studies-facpubs/article/1416/viewcontent/Miocene_Glacial_Dynamics_Recorded_by_Variations_in.pdf |
geographic |
Antarctic Ross Sea McMurdo Sound |
geographic_facet |
Antarctic Ross Sea McMurdo Sound |
genre |
Antarc* Antarctic Antarctica Ice Shelf Iceberg* McMurdo Sound Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Iceberg* McMurdo Sound Ross Sea Sea ice |
op_source |
Department of Earth and Environmental Studies Faculty Scholarship and Creative Works |
op_relation |
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/417 doi:10.1029/2018JB016865Final published version Open https://digitalcommons.montclair.edu/context/earth-environ-studies-facpubs/article/1416/viewcontent/Miocene_Glacial_Dynamics_Recorded_by_Variations_in.pdf |
op_doi |
https://doi.org/10.1029/2018JB016865Final |
_version_ |
1772176524161581056 |