Chapter 10 Traction Structures in Contourites

Martı́n-Chivelet, Javier; Fregenal-Martı́nez, Marı́a Antonia; Chacón, B.

doi:10.1016/s0070-4571(08)10010-3

Cited by 45 publications

(47 citation statements)

References 47 publications

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“…2; Table 2). Bi-gradational trends have been previously described in contourite sediments and 495 interpreted to record an increase followed by decrease in the current velocities (e.g., Martín-Chivelet et al, 2008). The bi-gradational patterns in the Zr/Ba and MS plots (Figs.…”

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confidence: 60%

“…Within the cross laminae, mud offshoots and internal erosional surfaces are distinctive features of fluctuating currents where successive traction and suspension events are super-imposed, indicating bottom-currents sedimentation as the principal process for the F1 laminated claystones (Shanmugam et al, 1993;Stow et al, 2002). Based on these observations, we interpret F1 as glacial laminated muddy contourites during peak current velocities (Lucchi and Rebesco, 2007;Martín-Chivelet et al 2008;Rebesco et al, 2014). 485 Bioturbated sediments in F2 were previously interpreted as interglacial hemipelagic deposits (Escutia et al, 2011).…”

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confidence: 74%

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Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Salabarnada

Escutia

Röhl

et al. 2017

Preprint

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The late Oligocene experienced atmospheric concentrations of CO 2 between 400 and 750 ppm, which are within the IPCC projections for this century, assuming unabated CO 2 emissions. However, Antarctic Unlike today, the continental shelf was not over-deepened, and thus marine-based ice sheet expansion was likely limited to coastal regions. Combined, these data suggest that ice sheets in the Wilkes 60 Subglacial Basin were largely land-based, and therefore retreated as a consequence of surface melt during late Oligocene, rather than direct ocean forcing and marine ice sheet instability processes as it did in younger past warm intervals. Spectral analysis on late Oligocene sediments from the eastern Wilkes Land margin show that the glacial-interglacial cyclicity and resulting displacements of the Southern Ocean frontal systems between 26-25 Ma were forced by obliquity. 65Clim. Past Discuss., https://doi

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confidence: 74%

Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Salabarnada

Escutia

Röhl

et al. 2017

Preprint

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show abstract

“…Within the cross laminae, mud offshoots and internal erosional surfaces are distinctive features of fluctuating currents where successive traction and suspension events are super-imposed, indicating bottom-currents sedimentation as the principal process for the F1 laminated claystones (Shanmugam et al, 1993;Stow et al, 2002). Based on these observations, we interpret F1 as glacial laminated muddy contourites 480 following the classification of Stow and Faugères (2008) during peak current velocities (Lucchi and Rebesco, 2007;Martín-Chivelet et al 2008;Rebesco et al, 2014). 485 Bioturbated sediments in F2 were previously interpreted as interglacial hemipelagic deposits (Escutia et al, 2011).…”

Section: Glacial and Interglacial Contourite Sedimentation Off Wilkesmentioning

confidence: 76%

Supplementary material to "Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations"

Salabarnada¹,

Escutia²,

Röhl³

et al. 2017

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2017) Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations. AbstractThe late Oligocene experienced atmospheric concentrations of CO 2 between 400 and 750 ppm, which are within the IPCC projections for this century, assuming unabated CO 2 emissions. However, Antarctic 40 ice sheet and Southern Ocean paleoceanographic configurations during the late Oligocene are not well resolved, but are important to understand the influence of high-latitude Southern Hemisphere feedbacks on global climate under such CO 2 scenarios. Here, we present late Oligocene (26-25 Ma) ice sheet and paleoceanographic reconstructions recorded in sediments recovered by IODP Site U1356, offshore of the Wilkes Land margin in East Antarctica. Our study, based on a combination of sediment facies 45 analysis, physical properties, and geochemical parameters, shows that glacial and interglacial sediments are continuously reworked by bottom-currents, with maximum velocities occurring during the interglacial periods. Glacial sediments record poorly ventilated, low-oxygenation bottom water conditions, interpreted to represent a northward shift of westerly winds and surface oceanic fronts. During interglacial times, more oxygenated and ventilated conditions prevailed, which suggests 50 enhanced mixing of the water masses with enhanced current velocities. Micritic limestone intervals within some of the interglacial facies represent warmer paleoclimatic conditions when less corrosive warmer northern component water (e.g. North Atlantic sourced deep water) had a greater influence on the site. The lack of iceberg rafted debris (IRD) throughout the studied interval contrasts with early Oligocene and post-Oligocene sections from Site U1356 and with late Oligocene strata from the Ross 55 Sea (CRP and DSDP 270), which contain IRD and evidence for coastal sea ice and glaciers. These observations, supported by elevated paleotemperatures and the absence of sea-ice, suggest that between 26 and 25 Ma reduced glaciers or ice caps occupied the terrestrial lowlands of the Wilkes Land margin.Unlike today, the continental shelf was not over-deepened, and thus marine-based ice sheet expansion was likely limited to coastal regions. Combined, these data suggest that ice sheets in the Wilkes 60 Subglacial Basin were largely land-based, and therefore retreated as a consequence of surface melt during late Oligocene, rather than direct ocean forcing and marine ice sheet instability processes as it did in younger past warm intervals. Spectral analysis on late Oligocene sediments from the eastern Wilkes Land margin show that the glacial-interglacial cyclicity and resulting displacements of the Southern Ocean frontal systems between 26-25 Ma were forced by obliquity. 65

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“…11) (e.g., Martin-Chivelet et al, 2008). Furthermore, tripartite subdivision grain size distribution patterns observed in ungraded sand lithofacies are also not a character of turbidites (Fig.…”

Section: Lithofacies Interpretationmentioning

confidence: 93%

Middle Miocene reworked turbidites in the Baiyun Sag of the Pearl River Mouth Basin, northern South China Sea margin: Processes, genesis, and implications

Gong

Wang

Zheng

et al. 2016

Journal of Asian Earth Sciences

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Chapter 10 Traction Structures in Contourites

Cited by 45 publications

References 47 publications

Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Supplementary material to "Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations"

Middle Miocene reworked turbidites in the Baiyun Sag of the Pearl River Mouth Basin, northern South China Sea margin: Processes, genesis, and implications

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Chapter 10 Traction Structures in Contourites

Cited by 45 publications

References 47 publications

Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations

Supplementary material to &quot;Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations&quot;

Middle Miocene reworked turbidites in the Baiyun Sag of the Pearl River Mouth Basin, northern South China Sea margin: Processes, genesis, and implications

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Supplementary material to "Late Oligocene obliquity-paced contourite sedimentation in the Wilkes Land margin of East Antarctica: implications for paleoceanographic and ice sheet configurations"