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Transkei Basin, southwestern Indian Ocean: Bright spots as an indication for a restricted circulation

Gabriele Uenzelmann‐Neben-2013-01-01-Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut)
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TL;DRAbstract

During the break-up of Gondwana and the development of smaller crustal blocks several isolated basins were formed repeatedly. This led to a restricted exchange of water masses between the Tethys and these basins as well as the evolving South Atlantic and Weddell Sea. Anoxic conditions resulted in the deposition of black shales as observed in the Transkei Basin and the northern Mozambique Basin. Later tectonic movements allowed the formation of traps and pathways for fluids, which have been formed in conjunction with the black shales and high sedimentation rates proximal to the continent. The release of these fluids has been related to earthquakes as the initiator and slumps (e.g. the Agulhas Slump) and slides as an effect.
\nThe Transkei Basin, located between two Large Igneous Provinces (LIP, Agulhas Plateau and Mozambique Ridge) was formed during the Cretaceous magnetic quiet zone so the exact formation age is unclear.
\nI propose to drill the Transkei Basin to recover comple

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During the break-up of Gondwana and the development of smaller crustal blocks several isolated basins were formed repeatedly. This led to a restricted exchange of water masses between the Tethys and these basins as well as the evolving South Atlantic and Weddell Sea. Anoxic conditions resulted in the deposition of black shales as observed in the Transkei Basin and the northern Mozambique Basin. Later tectonic movements allowed the formation of traps and pathways for fluids, which have been formed in conjunction with the black shales and high sedimentation rates proximal to the continent. The release of these fluids has been related to earthquakes as the initiator and slumps (e.g. the Agulhas Slump) and slides as an effect.
\nThe Transkei Basin, located between two Large Igneous Provinces (LIP, Agulhas Plateau and Mozambique Ridge) was formed during the Cretaceous magnetic quiet zone so the exact formation age is unclear.
\nI propose to drill the Transkei Basin to recover comple

Keywords

GeologyStructural basinCretaceousLarge igneous provinceSedimentary rockPaleontologyGondwanaOceanic basin

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