The Development of Paleoseaways Around Antarctica

Lawver, Lawrence A.; Gahagan, Lisa M.; Coffin, Millard F.

doi:10.1029/ar056p0007

Cited by 317 publications

(70 citation statements)

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“…The gateway south of South Africa evolved during the break-up of Gondwana between 170 Ma and 160 Ma with the formation of a shallow basin between the Mozambique Basin and the Rijser-Larsen Sea (Lawver et al, 1992;Storey et al, 2001;Jokat et al, 2003), and the creation of oceanic crust in the Natal Valley started at ~130 Ma (Goodlad et al, 1982). A deep water passage between the Indian and South Atlantic Oceans was created after the separation of the Falkland Plateau from Africa at 110 to 100 Ma (König and Jokat, 2006).…”

Section: Geological and Oceanographic Backgroundmentioning

confidence: 99%

Palaeoceanographic Interpretation of a Seismic Profile From the Southern Mozambique Ridge, Southwestern Indian Ocean

Uenzelmann-Neben¹,

Watkeys²,

Kretzinger³

et al. 2011

South African Journal of Geology

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Seismic reflection data from the southern Mozambique Ridge, Southwestern Indian Ocean, show indications for a modification in the oceanic circulation system during the Neogene. Major reorganisations in the Indian Ocean circulation system accompanying the closure of the Indonesian Gateway led to the onset of current controlled sedimentation in the vicinity of the Mozambique Ridge at 14 Ma. The modifications in water mass properties and path are documented in changes in reflection characteristics in the Mozambique Ridge area. Correlating these with identified changes of the Nd isotope evolution in deep water masses the general present day large scale circulation in the southern Indian Ocean is suggested to have prevailed for the last 9 Ma. References should not be included in abstracts.SOUTH AFRICAN JOURNAL OF GEOLOGY, 2011, VOLUME 114. (Smith and Sandwell, 1997;Uenzelmann-Neben, 2005;Jokat, 2006 Lutjeharms, 1996).The Agulhas Current is the western boundary current of the Indian Ocean It extends to water depths greater than 2000 m and has a mean transport of 108 m 3 /s (Lutjeharms, 1996; De Ruijter et al., 1999). Southwest of Africa the Agulhas Current turns abruptly eastward in a tight retroflection loop and becomes known as the Agulhas Return Current. This current flows eastwards to the Agulhas Plateau where it forms a major northward loop around the plateau (Lutjeharms, 1996; De Ruijter et al., 1999). Data Acquisition and AnalysisThis study is based on seismic reflection data gathered at the southern Mozambique Ridge (Figure 1a) (Uenzelmann-Neben, 2005). The seismic reflection data were collected using a three GI-gun cluster as source and a 2.4 km long digital streamer system with 180 channels to record the data. A sample rate of 1 ms guaranteed a theoretical vertical resolution of 4 m. (Lutjeharms, 2006). SF= secondary faults.

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Section: Geological and Oceanographic Backgroundmentioning

confidence: 99%

Palaeoceanographic Interpretation of a Seismic Profile From the Southern Mozambique Ridge, Southwestern Indian Ocean

Uenzelmann-Neben¹,

Watkeys²,

Kretzinger³

et al. 2011

South African Journal of Geology

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“…from the ODSN Plate Tectonic Reconstruction Service; Hay et al, 1999), or more detailed reconstructions led from tectonostratigraphic interpretations that are difficult to reconcile with the record of those intricacies as preserved in the floor of the Scotia Sea's various basins (e.g. Lawver et al, 1992Lawver et al, , 2011. Although data sets and models concerning the growth of many of these basins exist (e.g.…”

Section: Introductionmentioning

confidence: 99%

Tectonic reconstructions for paleobathymetry in Drake Passage

2014

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited.

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“…The marine benthic fauna of the Antarctic continental shelf is considered to be the most isolated on the planet, due to the extreme environmental conditions and the surrounding barriers such as geographic distances, oceanic currents and deep waters (Lawver et al 1992, Crame 1999, Clarke et al 2005 The Pleistocene glacial cycles were marked in Antarctica by the extension of the ice coverage over the continental shelf, and up to 100 km on the continental slope (Grobe & Mackensen 1992). Cer tainly, the glacial periods of the Cenozoic have attracted a lot a scientifi c attention regarding the strategies developed by the benthic fauna to tolerate these huge climatic changes in the Southern Ocean and the extension and contraction of the ice sheet on the Antarctic continental platform (Kennet 1977, Brey et al 1996, Zachos et al 2001, Convey et al 2008.…”

Section: Introductionmentioning

confidence: 99%