Geology of the Margin of the Victoria Land Basin off Cape Roberts, Southwest Ross Sea

Barrett, P. J.; Henrys, Stuart; Bartek, Louis R.; Brancolini, Giuliano; Busetti, Martina; Davey, F. J.; Hannah, Michael; Pyne, A.

doi:10.1029/ar068p0183

Cited by 11 publications

(10 citation statements)

References 22 publications

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“…Interpretations of ages of the sediment packages are derived from the respective core chronologies . The V1-V5 designations for seismic stratigraphic sediment packages (see also Figure 1c) follow Barrett et al [1995], while the a-w designations for seismic reflectors follow Henrys et al [2001]. (Figure 3).…”

Section: Chronology Of the Studied Coresmentioning

confidence: 83%

“…While specimens from numerous microfossil groups are preserved in the cored VLB sediments, such as calcareous nannofossils [e.g., Watkins and Villa, 2000], dinoflagellate cysts and marine and terrestrial palynomorphs [Hannah, 1997;Hannah et al, 2001;Raine and Askin, 2001], marine diatoms are the most abundant, best preserved and most agediagnostic microfossil group in sediment cores from the VLB [e.g., Harwood, 1986Harwood, , 1989Harwood et al, 1998;Scherer et al, 2000;Harwood and Bohaty, 2001;Olney et al, 2007]. Development of integrated chronologies, using all available age-diagnostic data, is the most fruitful way of Barrett et al [1995]. deriving accurate chronostratigraphies for these glacigene sediments.…”

Section: Chronology Of the Studied Coresmentioning

confidence: 99%

“…The V1–V5 designations for seismic stratigraphic sediment packages (see also Figure c) follow Barrett et al . [], while the a–w designations for seismic reflectors follow Henrys et al . [].…”

Section: Introductionmentioning

confidence: 99%

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Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

et al. 2013

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[1] We synthesize environmental magnetic results for sediments from the Victoria Land Basin (VLB), which span a total stratigraphic thickness of 2.6 km and ã 17 Myr age range. We assess how magnetic properties record paleoclimatic, tectonic, and provenance variations or mixtures of signals resulting from these processes. The magnetic properties are dominated by large-scale magnetite concentration variations. In the late Eocene and early Oligocene, magnetite concentration variations coincide with detrital smectite concentration and crystallinity variations, which reflect paleoclimatic control on magnetic properties through influence on weathering regime; high magnetite and smectite concentrations indicate warmer and wetter climates and vice versa. During the early Oligocene, accelerated uplift of the Transantarctic Mountains gave rise to magnetic signatures that reflect progressive erosion of the Precambrian-Mesozoic metamorphic, intrusive, and sedimentary stratigraphic cover succession associated with unroofing of the adjacent Transantarctic Mountains. From the early Oligocene to the early Miocene, a consistent fining upward of magnetite particles through the recovered composite record likely reflects increased physical weathering with glacial grinding contributing to progressively finer grained Ferrar Dolerite-sourced magnetite. After 24 Ma, the magnetic properties of VLB sediments are primarily controlled by the weathering and erosion of McMurdo Volcanic Group rocks; increased volcanic glass contents contribute to the fining upward of magnetite grain size. Overall, long-term magnetic property variations record the first-order geological processes that controlled sedimentation in the VLB, including paleoclimatic, tectonic, provenance, and volcanic influences.

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Section: Chronology Of the Studied Coresmentioning

confidence: 83%

Section: Chronology Of the Studied Coresmentioning

confidence: 99%

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Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

et al. 2013

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“…Grab samples of the modern seafloor sediments were compared to core textures. This led workers to the interpretation that a significant section of the DVDP-15 core reflected seasonal deposition from settling through suspension of sediment deposited by wind or released from melting sea ice (Barrett et al, 1975;Barnes et al, 1976;Barrett and Treves, 1981;Barrett et al, 1995). By studying seafloor sediments, early workers proposed that aeolian sediment, mainly fine to very-fine sand, is the most significant contributor to nearshore sedimentation in McMurdo Sound (Barrett et al, 1983) and for the nearby Terra Nova Bay polynya (Hughes and Krissek, 1985); however, no quantitative study to date has been carried out to confirm these conclusions at a regional scale.…”

Section: Aeolian Sediment In Antarctica 121 Aeolian Sediment Dispersal To the Ross Seamentioning

confidence: 99%

“…As summarised by Gunn and Warren (1962); Craddock (1970); Barrett et al (1995); Denton and Marchant (2000) and more recently Cox et al (2012), the regional geology has been subdivided into several broadscale groupings based on age and lithology (Figure 1.2). Meta-sediments and granitic-granodioritic basement rocks are overlain by ∼2 km of broadly horizontal, largely terrestrial sediments sourced from the East Antarctic craton and eastern Ross Sea (Devonian to Triassic, Beacon Supergroup).…”

Section: Geology Location and Lithology Of Unconsolidated Sedimentmentioning

confidence: 99%

Sedimentology and numerical modelling of aeolian sediment dispersal, McMurdo Sound, southwest Ross Sea, Antarctica

Chewings¹

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<p>Large volumes of aeolian sand and dust are deflated from unconsolidated till deposits, and supraglacial debris surrounding McMurdo Sound, Antarctica. This material is transported offshore with windblown snow onto extensive winter-formed sea ice in the southwest Ross Sea, and is subsequently released into the water-column during summer sea ice breakup. Aeolian sediment samples were collected from a ~600 km² area of sea ice in western McMurdo Sound to determine the magnitude of deposition and identify sediment sources. A new 2-dimensional numerical aeolian sediment transport model (NaMASTE) tuned specifically for the McMurdo Sound area, was used to explore the ability of the local wind system to move sediment from source areas to sea ice and to determine the pattern and extent of aeolian sediment dispersal to the southwest Ross Sea. Debris deposits on the McMurdo Ice Shelf debris bands are the most dominant sediment source for the area. Unconsolidated deposits between Cape Bernacchi and Spike Cape, and the Taylor Valley mouth are significant secondary deposits. Mass accumulation rates varied between 0.15 g m⁻² y⁻¹ and 54.6 g m⁻² y⁻¹, equating to a background aeolian sediment accumulation rate, excluding extremely high values, of 1.14 ± 0.59 g m⁻² y⁻¹ for the McMurdo Sound coastal sea ice zone. This is 3–5 orders of magnitude more than global background dust fallout for the Ross Sea. Modal grain size is very-fine sand to coarse silt. Notably, much of this material is distributed in localised, high sand content plumes that are oriented downwind from source, with finer deposits found outside these zones. An average seafloor linear sedimentation rate of 0.2 cm ky⁻¹ is calculated for McMurdo Sound, which is minor compared to biogenic sedimentation for the region. This equates to ~0.7 Gg y⁻¹ aeolian sediment entering McMurdo Sound during sea ice melt. Application of NaMASTE successfully simulated the general aeolian sediment distribution pattern. Testing of model variables suggests that aeolian material is mainly transported during strong (>20 m s⁻¹) wind events. Modelling also suggests aeolian material from McMurdo Sound can be transported north to the Drygalski Ice Tongue, ~250 km from source, but only in very trace quantities.</p>

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Rift History of the Western Victoria Land Basin: A new Perspective Based on Integration of Cores with Seismic Reflection Data

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Geology of the Margin of the Victoria Land Basin off Cape Roberts, Southwest Ross Sea

Cited by 11 publications

References 22 publications

Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

Sedimentology and numerical modelling of aeolian sediment dispersal, McMurdo Sound, southwest Ross Sea, Antarctica

Rift History of the Western Victoria Land Basin: A new Perspective Based on Integration of Cores with Seismic Reflection Data

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