Late Eocene signals of oncoming Icehouse conditions and changing ocean circulation, Antarctica

Huang, Xiaoxia; Steel, Ronald J.; Larter, Robert D

doi:10.1016/j.epsl.2022.117885

Cited by 3 publications

(1 citation statement)

References 56 publications

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“…Among these, interpretation of the northern conjugate pair is likely to be more challenging because of burial of the Indian continental margin beneath the Neogene Ganges Delta and prograded Eocene shelf edge (Alam et al, 2003), and deformation and volcanic modification of parts of the Kerguelen Plateau's northern edge during and since its Paleogene breakup from Broken Ridge (Borissova et al, 2002;Rotstein et al, 2001). Further south, the Antarctic margin appears structurally simpler each side of a short prograded segment off Prydz Bay (Huang et al, 2022). Its conjugate is suggested to lie along the southern edge of Elan Bank and its eastwards prolongation along the 59 Degree Graben.…”

Section: Microcontinents In Gondwanamentioning

confidence: 99%

Overture for the Mandara and Vasuki Plates

Eagles

2024

tekt

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Models of past plate motions in the Indian Ocean help map the supercontinent Gondwana and investigate how mantle plumes influence plate tectonics. Reducing confidence in this, however, the range of available models all produce large pre-94 Ma movements, in various kinematic senses, between India and Madagascar. There is no observational evidence for any of these motions, suggesting along with their diversity that they are artefacts stemming from contrasting resolutions of techniques used for reconstructing India and Madagascar to Antarctica. A higher resolution approach to India–Antarctica reconstruction concentrates on geophysical records of relative plate motion azimuths. Applying its results regionally eliminates Indo-Malagasy motions before 94 Ma, and prompts new hypotheses of two small tectonic plates. The early Cretaceous Mandara plate, in the Enderby Basin off East Antarctica, may have initiated and rotated at a mid-ocean ridge that was supplied by excess melt from the Kerguelen plume. The late Cretaceous Vasuki plate may have conveyed Sri Lanka southwards across the western Bay of Bengal. The 85°E and Comorin ridges may have formed at active transform fault zones along Vasuki’s margins that were supplied with excess melt from the Crozet and Marion plumes. The model confidently implies the presence of 500,000 km2 of continental crust beneath the Kerguelen Plateau, places Sri Lanka 1000 km further east within Gondwana than previous reconstructions, and casts doubt on the existence of plate kinematic signals that have previously been attributed to the arrival and spread of the Marion plume beneath India and Madagascar at ~105 Ma.

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Section: Microcontinents In Gondwanamentioning

confidence: 99%

Overture for the Mandara and Vasuki Plates

Eagles

2024

tekt

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Global Eocene-Oligocene unconformity in clastic sedimentary basins

Burton,

McHargue,

Graham

2024

Earth-Science Reviews

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From Bottom‐Water Production to Warm Water Intrusions—The Cenozoic History of Bottom‐Current Evolution Offshore the Denman‐Shackleton Region, East Antarctica

Hochmuth,

Whittaker,

Huang

2024

Paleoceanog and Paleoclimatol

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The deep glacial trough and hinterland of the Denman Glacier (East Antarctica) makes the area around the Shackleton ice shelf sensitive to ice loss due to warmer deep water intruding onto the continental shelf in the near future. In addition, the configuration of the ocean currents offshore is an important factor in priming the local and regional vulnerability to warm water intrusions. Here, we use reflection seismic data sets from the Bruce Rise offshore the Denman‐Shackleton region to investigate the Cenozoic history of the ocean bottom current configurations offshore and their influence on the Cenozoic sedimentation patterns of the Denman‐Shackleton region. On the Bruce Rise, sediment drift building, and erosional features indicate three distinct ocean current configurations, (a) the production of dense shelf waters in times of a smaller East Antarctic Ice Sheet (EAIS), (b) periods dominated by a strong Antarctic Slope Current (ASC) and (c) periods with a weak ASC. During the early establishment of the EAIS, the Denman‐Shackleton area contributed to the production of Antarctic Bottom Water, a process which stabilizes the regional ice sheet. With a growing icesheet, the ASC strengthened representing an effective barrier between the continental shelf and the warmer water masses of the deeper ocean during most of the times of an extended EAIS. The transition in the paleoceanographic setting from a strong, erosive ASC, toward a weak ASC increases the vulnerability of the Denman‐Shackleton continental shelf to deep water intrusions as we are observing today.

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Late Eocene signals of oncoming Icehouse conditions and changing ocean circulation, Antarctica

Cited by 3 publications

References 56 publications

Overture for the Mandara and Vasuki Plates

Overture for the Mandara and Vasuki Plates

Global Eocene-Oligocene unconformity in clastic sedimentary basins

From Bottom‐Water Production to Warm Water Intrusions—The Cenozoic History of Bottom‐Current Evolution Offshore the Denman‐Shackleton Region, East Antarctica

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