A sedimentological record of early Miocene ice advance and retreat, AND-2A drill hole, McMurdo Sound, Antarctica

Field, Brad; Browne, Greg H.; Fielding, Christopher R.; Florindo, Fabio; Harwood, David M.; Judge, Shelley; Krissek, L. A.; Panter, K. S.; Passchier, Sandra; Pekar, Stephen F.; Sandroni, S.; Talarico, F.

doi:10.1130/ges01592.1

Cited by 3 publications

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“…LUs from 778.63 mbsf to the bottom of AND‐2A drill core (LSUs 11–14) record marked environmental variability in an ice‐distal to ice‐proximal depositional environment. We recognize settings varying from subglacial and grounding zone proximal to hemipelagic and neritic under the influence of icebergs and sea ice (Field et al, ; Fielding et al, ; Levy et al, ; Passchier et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies on the AND‐2A core include sequence stratigraphic analysis, detailed sedimentological analyses, sedimentary facies analysis, and integration of multiproxies (Field et al, ; Fielding et al, ; Levy et al, ; Passchier et al, , ), and produced slightly different environmental interpretations (Figure ).…”

Section: Previous Environmental Interpretationsmentioning

confidence: 99%

“…Previous studies on the AND-2A core include sequence stratigraphic analysis, detailed sedimentological analyses, sedimentary facies analysis, and integration of multiproxies (Field et al, 2018;Fielding et al, 2011;Levy et al, 2016;Passchier et al, 2011Passchier et al, , 2013, and produced slightly different environmental interpretations (Figure 9). Fielding et al (2011) recognized a repetitive stratal stacking pattern of lithofacies that was used to divide the entire AND-2A succession into 13 (third-order) glacimarine composite sequences (CSs; Figure 2 in Fielding et al, 2011).…”

Section: Previous Environmental Interpretationsmentioning

confidence: 99%

“…Recently, Field et al (2018) presented detailed sedimentological data from AND-2A that showed significant variability in Antarctic ice sheet extent during the early Miocene. From the stratigraphic interval below 778.63 mbsf, four CSs were recognized (CS1-CS4), which are comparable with LSUs 14-11 of Fielding, Whittaker, et al (2008; Figure 9h).…”

Section: 1029/2018jb016865mentioning

confidence: 99%

“…The entire stratigraphic section recovered was divided into 14 distinct larger‐scale lithostratigraphic units (LSUs) on the basis of major changes in lithology (Field et al, ; Fielding et al, ; Fielding, Atkins, et al, ; Passchier et al, , ). We report on mineral magnetic properties from the interval below 778.63 mbsf, which encompasses LSUs 11 to 14 spanning approximately 1.5 Myr of the early Miocene, from 18.7 to 20.2 Ma ago (Acton, Crampton, Di Vincenzo, et al, ; Levy et al, ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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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Section: Discussionmentioning

confidence: 99%

Section: Previous Environmental Interpretationsmentioning

confidence: 99%

Section: Previous Environmental Interpretationsmentioning

confidence: 99%

Section: 1029/2018jb016865mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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Millennial-scale variability of the Antarctic ice sheet during the early Miocene

Sullivan,

Meyers,

Levy

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Millennial-scale ice sheet variability (1–15 kyr periods) is well documented in the Quaternary, providing insight into critical atmosphere–ocean–cryosphere interactions that can inform the mechanism and pace of future climate change. Ice sheet variability at similar frequencies is comparatively less known and understood prior to the Quaternary during times, where higher atmospheric p CO 2 and warmer climates prevailed, and continental-scale ice sheets were largely restricted to Antarctica. In this study, we evaluate a high-resolution clast abundance dataset (ice-rafted debris) that captures East Antarctic ice sheet variability in the western Ross Sea during the early Miocene. This dataset is derived from a 100 m-thick mudstone interval in the ANtarctic DRILLing (ANDRILL or AND) core 2A, which preserves a record of precession and eccentricity variability. The sedimentation rates are of appropriate resolution to also characterize the signature of robust, subprecession cyclicity. Strong sub-precession (~10 kyr) cyclicity is observed, with an amplitude modulation in lockstep with eccentricity, indicating a relationship between high-frequency Antarctic ice sheet dynamics and astronomical forcing. Bicoherence analysis indicates that many of the observed millennial-scale cycles (as short as 1.2 kyr) are associated with nonlinear interactions (combination or difference tones) between each other and the Milankovitch cycles. The presence of these cycles during the Miocene reveals the ubiquity of millennial-scale ice sheet variability and sheds light on the interactions between Earth’s atmosphere, ocean, and ice in climates warmer than the Quaternary.

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Linking the terrestrial environmental record at Mason Spur volcanic complex with the middle Miocene–Pleistocene Ross Sea marine record, Antarctica: A history of subaerial (ice-free) eruptions and glaciovolcanism under variable ice thicknesses

Smellie,

Martin,

Townsend

et al. 2024

Geological Society of America Bulletin

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Research into volcanism in southern Victoria Land, Antarctica, within the West Antarctic rift system, has focussed historically on the geochemistry and chronology of its volcanic centers. However, volcanoes in the West Antarctic rift system have also been dramatically influenced by the prevailing eruptive environment. Mason Spur is a middle Miocene to Pleistocene volcanic complex in the Erebus Volcanic Province. The deep interior of the complex is revealed and is used to assess its development under different environmental conditions. Many of the volcanic sequences erupted within ice and are thus ultraproximal compared with marine sediments, which are the usual source of environmental information. The volcanic rocks provide a unique, well-dated record of the terrestrial environmental conditions independent of the marine record, to which they are an important counterbalance. Evidence is provided for conditions varying between ice-free, alpine ice, and regional ice sheets, and direct comparisons are made with the marine record. The first contemporary ice thicknesses are also deduced for the Erebus Volcanic Province. The results significantly advance our understanding of the middle Miocene−Pleistocene Antarctic environment in the coastal Victoria Land region.

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A sedimentological record of early Miocene ice advance and retreat, AND-2A drill hole, McMurdo Sound, Antarctica

Abstract: ABSTRACT

Cited by 3 publications

References 50 publications

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

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

Millennial-scale variability of the Antarctic ice sheet during the early Miocene

Linking the terrestrial environmental record at Mason Spur volcanic complex with the middle Miocene–Pleistocene Ross Sea marine record, Antarctica: A history of subaerial (ice-free) eruptions and glaciovolcanism under variable ice thicknesses

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