The Kerguelen plateau: Records from a long-living/composite microcontinent

Bénard, Francine; Callot, Jean‐Paul; Vially, R.; Schmitz, Julien; Roest, W. R.; Patriat, M.; Loubrieu, B.

doi:10.1016/j.marpetgeo.2009.08.011

Cited by 48 publications

(33 citation statements)

References 63 publications

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“…Most authors based upon data derived from the DSDP (Legs 22e28) and ODP (Legs 120, 121, 183) recognize the eruption of the Kerguelen Plume in the nascent Indian Ocean after the East Gondwana (IndiaeAntarctica) break up in the Early Cretaceous (ValanginianeHauterivian). The present day Kerguelen Large Igneous Magmatic Province (KLIMP) spreads over 22 of longitude and 15 of latitude, of which the older South Kerguelen Plateau encompasses nearly 12 longitude and 7 latitude (Bénard et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Delineation of the 85°E ridge and its structure in the Mahanadi Offshore Basin, Eastern Continental Margin of India (ECMI), from seismic reflection imaging

Bastia

Radhakrishna

Das

et al. 2010

Marine and Petroleum Geology

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Section: Discussionmentioning

confidence: 99%

Delineation of the 85°E ridge and its structure in the Mahanadi Offshore Basin, Eastern Continental Margin of India (ECMI), from seismic reflection imaging

Bastia

Radhakrishna

Das

et al. 2010

Marine and Petroleum Geology

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“…Eruption ages decrease northward across the Kerguelen Plateau: ages from southern Kerguelen Plateau basalts are 118–110 Ma (Coffin et al, ; Duncan, ), central Kerguelen Plateau basalts are 100–95 Ma (Duncan, ), and northern Kerguelen Plateau ages are 40–35 Ma (Duncan, ). While the central and northern Kerguelen Plateaus are composed of volcanic material related to ridge‐plume interactions, continental fragments found within the crust of the southern Kerguelen Plateau suggest that this plateau is at least partially underlain by stretched continental crust (Bénard et al, ). The uppermost crust of the Kerguelen Plateau was largely emplaced subaerially, based on vesicularity and oxidative alteration of basalts recovered from ODP cores (Coffin et al, ; Duncan, ; Frey et al, ).…”

Section: Regional Setting and Hydrographymentioning

confidence: 99%

No Change in Southern Ocean Circulation in the Indian Ocean From the Eocene Through Late Oligocene

Wright

Scher

Seton

et al. 2018

Paleoceanog and Paleoclimatol

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Deciphering the evolution of Southern Ocean circulation during the Eocene and Oligocene has important implications for understanding the development of the Antarctic Circumpolar Current and transition to Earth's “icehouse” climate. To better understand ocean circulation patterns in the Indian Ocean sector of the Southern Ocean, we generated a new fossil fish tooth neodymium isotope record (εNd) from the upper Eocene to upper Oligocene sections (36–23 Ma) of Ocean Drilling Program Sites 744 and 748 (Kerguelen Plateau, Indian Ocean). Reconstructed seawater εNd values from fossil fish teeth are used to trace changes in water masses across ocean basins. The records from Site 748 and Site 744 reveal a gradual shift from εNd values around −6.5 to −7.5 in the late Eocene to εNd values between −7.5 and −8.3 by the late Oligocene, consistent with a Circumpolar Deep Water (CDW) influence at the Kerguelen Plateau throughout the Oligocene. We interpret the shift to less radiogenic values to reflect the increased export of Northern Component Water to the Southern Ocean, likely into the proto‐CDW. However, the records show no major change in water mass composition around the Kerguelen Plateau that would accompany an increase in Pacific throughflow related to the opening of Drake Passage and imply that Pacific throughflow via the Drake Passage occurred by the late Eocene. High‐frequency variability in ɛNd values at Site 744 is interpreted as an imprint of Oligocene glacial activity, with a particularly pronounced excursion at 32.6 Ma roughly coinciding with other glacial weathering indicators around Antarctica.

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“…These two regions were part of Gondwanaland, and their first phase of rifting probably started during the Triassic‐Jurassic [ Veevers , ]. Three sectors can be differentiated along these margins based on the type of crust and their style of deformation during rifting: To the west, the Broken Ridge/Kerguelen Plateau, which result from the rifting of a magmatic plateau linked to the activity of the Kerguelen hotspot during the Cretaceous (131–97 Ma) [ Operto and Charvis , ; Rotstein et al , ; Borissova et al , ; Bénard et al , ]; In the center, the Great Australian Bight (GAB)/Wilkes Land. Currently, the oceanic domain of this sector is associated with the presence of the Australian Antarctic Discordance (AAD), an area of abnormally deep basement and cold lithosphere interpreted to be linked to the remains of a sinking broken slab [ Weissel and Hayes , ; Géli et al , ; Whittaker et al , ]; To the east, the Otway Basin/George V Land margins, which result from an oblique continental rift affected by important transform systems [ Miller et al , ].…”

Section: The Australian‐antarctic Conjugate Rifted Marginsmentioning

confidence: 99%

Tectonomagmatic evolution of the final stages of rifting along the deep conjugate Australian-Antarctic magma-poor rifted margins: Constraints from seismic observations

et al. 2015

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The processes related to hyperextension, exhumed mantle domains, lithospheric breakup, and formation of first unequivocal oceanic crust at magma-poor rifted margins are yet poorly understood. In this paper, we try to bring new constraints and new ideas about these latest deformation stages by studying the most distal Australian-Antarctic rifted margins. We propose a new interpretation, linking the sedimentary architectures to the nature and type of basement units, including hyperextended crust, exhumed mantle, embryonic, and steady state oceanic crusts. One major implication of our study is that terms like prerift, synrift, and postrift cannot be used in such polyphase settings, which also invalidates the concept of breakup unconformity. Integration and correlation of all available data, particular seismic and potential field data, allows us to propose a new model to explain the evolution of magma-poor distal rifted margins involving multiple and complex detachment systems. We propose that lithospheric breakup occurs after a phase of proto-oceanic crust formation, associated with a substantial magma supply. First steady state oceanic crust may therefore not have been emplaced before~53.3 Ma corresponding to magnetic anomaly C24. Observations of magma amount and its distribution along the margins highlight a close magma-fault relationship during the development of these margins.

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The Kerguelen plateau: Records from a long-living/composite microcontinent

Cited by 48 publications

References 63 publications

Delineation of the 85°E ridge and its structure in the Mahanadi Offshore Basin, Eastern Continental Margin of India (ECMI), from seismic reflection imaging

Delineation of the 85°E ridge and its structure in the Mahanadi Offshore Basin, Eastern Continental Margin of India (ECMI), from seismic reflection imaging

No Change in Southern Ocean Circulation in the Indian Ocean From the Eocene Through Late Oligocene

Tectonomagmatic evolution of the final stages of rifting along the deep conjugate Australian-Antarctic magma-poor rifted margins: Constraints from seismic observations

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