Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Uenzelmann-Neben, Gabriele; Huhn, Katrin

doi:10.1016/j.margeo.2009.07.011

Cited by 23 publications

(14 citation statements)

References 49 publications

(96 reference statements)

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“…6b, d, f and h). This supports the interpretation of current controlled sedimentation since then (Uenzelmann-Neben, 2001;Uenzelmann-Neben and Gohl, 2012;Uenzelmann-Neben and Huhn, 2009;Uenzelmann-Neben et al, 2007). The shapes and locations of these depocentres shift from one unit to the next (Fig.…”

Section: Discussionsupporting

confidence: 81%

Development of the Western Boundary Undercurrent at Eirik Drift related to changing climate since the early Miocene

Müller-Michaelis

Uenzelmann-Neben

2014

Deep Sea Research Part I: Oceanographic Research Papers

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Section: Discussionsupporting

confidence: 81%

Development of the Western Boundary Undercurrent at Eirik Drift related to changing climate since the early Miocene

Müller-Michaelis

Uenzelmann-Neben

2014

Deep Sea Research Part I: Oceanographic Research Papers

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“…The evolution of the ocean circulation system on million year time scales still remains unclear with only pieces of the puzzle slowly being resolved. Uenzelmann-Neben and Huhn (2009) have identified a record of current activity similar to today's circulation pattern on the southern South African continental margin extending into the Neogene. For the Transkei Basin, Southeastern South African continental margin, a reorganisation at 15 Ma and again at 3 Ma was observed (Schlüter and Uenzelmann-Neben, 2008b).…”

Section: Introductionmentioning

confidence: 87%

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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“…The Cenozoic history of current-controlled sedimentation in the A-SO gateway has been the subject of a number of publications with its onset being proposed in Eocene to Oligocene times following major paleoceanographic changes (Schlüter & Uenzelmann-Neben, 2008;Uenzelmann-Neben et al, 2007;Uenzelmann-Neben & Huhn, 2009). However, the occurrence of a late Maastrichtian to mid-Miocene hiatus at the Mozambique Ridge (MozR; Fischer et al, 2017;Simpson et al, 1974;Uenzelmann-Neben et al, 2011) points toward large regional differences in the paleoceanic circulation within the gateway.…”

Section: Introductionmentioning

confidence: 99%

Neogene Modifications of Circulation in the Northeastern African‐Southern Ocean Gateway

Fischer

Uenzelmann-Neben

2018

Geochem Geophys Geosyst

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In the African‐Southern Ocean gateway, several water masses originating in the Atlantic, Indian, and Southern oceans meet and mix. As a consequence, the gateway is crucial for the maintenance of the global thermohaline circulation. Newly acquired multichannel seismic reflection data collected across the southern Mozambique Ridge are used to reconstruct the impact of paleoceanographic modifications on the Neogene and Quaternary circulation in the northeastern African‐Southern Ocean gateway. The data show the occurrence of mid‐Miocene (~15 Ma) to early Pliocene (~5 Ma) contourite drifts and erosional features interpreted as evidence for the onset of current‐controlled sedimentation in the late Neogene resulting from mid‐Miocene cooling and closure of the Indonesian gateway. The Quaternary is characterized by a relocation of Antarctic Bottom Water inflow and the inception of two branches of the North Atlantic Deep Water circulation subsequent to the final closure of the Central American Seaway and the Northern Hemisphere Glaciation. Therefore, the two events triggered the onset of unhindered deep and bottom water circulation from the Atlantic into the Indian Ocean, whereas the Antarctic Intermediate Water circulation decreased due to the final closure of the Indonesian gateway. Our results show that tectonic and climatic events, which themselves may be linked, continuously modified the Cenozoic paleoceanic circulation in the African‐Southern Ocean gateway, and indicate that ocean gateways governing the global water mass exchange act as an excellent location to reconstruct such modifications based on the interpretation of contourite drifts and erosional features.

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Sedimentary deposits on the southern South African continental margin: Slumping versus non-deposition or erosion by oceanic currents?

Cited by 23 publications

References 49 publications

Development of the Western Boundary Undercurrent at Eirik Drift related to changing climate since the early Miocene

Development of the Western Boundary Undercurrent at Eirik Drift related to changing climate since the early Miocene

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

Neogene Modifications of Circulation in the Northeastern African‐Southern Ocean Gateway

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