Neogene history of the Deep Western Boundary Current at Rekohu sediment drift, Southwest Pacific (ODP Site 1124)

Joseph, Leah H; Rea, David K.; Pluijm, Ben A. van der

doi:10.1016/s0025-3227(04)00023-4

Cited by 33 publications

(23 citation statements)

References 48 publications

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“…Within the working area the extent of AR6 is limited to a narrow (50–100 km) stretch along the margin (Figures 3a–3c) and we did not use it for the mapping of depocenters. The horizon marks the end of the MMCO at ∼14 Ma [ Gruetzner et al , 2011] (Figures 3 and 4) and may be the product of an increase in deep‐water circulation in the Southern Hemisphere [ Carter et al , 2004; Joseph et al , 2004; Uenzelmann‐Neben , 2001] and a strengthening of the ACC [ Koenitz et al , 2008]. These hydographic changes are coeval with global climate cooling [ Zachos et al , 2001] and a deepening of the Drake Passage [ Lagabrielle et al , 2009].…”

Section: Seismostratigraphic Conceptmentioning

confidence: 99%

Variations in sediment transport at the central Argentine continental margin during the Cenozoic

Gruetzner¹,

Uenzelmann-Neben²,

Franke³

2012

Geochem Geophys Geosyst

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[1] The construction of the sedimentary cover at most passive continental margins includes gravitational downslope transport and along-slope contourite deposition, which are controlled by tectonics, climate and oceanography. At the eastern continental margin of Argentina the history of deposition and erosion is intimately linked to the evolution of the South Atlantic and its water masses. Here we present a detailed seismic investigation of the mixed depositional system located between 41 S and 45 S. The study provides a northward complement to prior investigations from the southern Argentine margin and together with these may be used as background information for future ocean drilling in the region. Prominent features in our seismic cross sections are submarine canyons, mass wasting deposits, contourite channels, and sediment drifts. Four major seismic units above regional reflector PLe (65 Ma) are separated by distinct unconformities of regional extent. Using a dense grid of reflection seismic profiles, we mapped the depocenter geometries of the seismic units and derived a chronology of the depositional processes during the Cenozoic. While the Paleocene/Eocene (65-34 Ma) is characterized by hemipelagic sedimentation under relatively sluggish bottom water conditions, strong Antarctic bottom water (AABW) circulation led to widespread erosion on the slope and growth of a detached sediment drift during the Oligocene and early Miocene (34-17 Ma). After deposition of an aggradational seismic unit interpreted to represent the Mid-Miocene climatic optimum (17-14 Ma), gravitational downslope sediment transport increased during the middle to late Miocene (14-6 Ma) possibly related to tectonic uplift in South America. The Pliocene to Holocene unit (<6 Ma) is very heterogeneous and formed by interactions of downslope and along-slope sediment transport processes as indicated by the evolution of canyons, slope plastered drifts and channels.

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Section: Seismostratigraphic Conceptmentioning

confidence: 99%

Variations in sediment transport at the central Argentine continental margin during the Cenozoic

Gruetzner¹,

Uenzelmann-Neben²,

Franke³

2012

Geochem Geophys Geosyst

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“…There is evidence for a coeval Middle Miocene increase in the deep-water circulation in the Southern Hemisphere (Kennett, 1982;Carter et al, 2004;Joseph et al, 2004), with good examples in the northern Weddell and Scotia Seas (Maldonado et al, 2006), and in the rise of the Pacific margin of the Antarctic Peninsula (Rebesco et al, 2002). Increased water-mass circulation could correlate to the middle Miocene event coeval with a major Miocene glaciation (Mi4), a sea-level lowering (Ser3), the initiation of the permanent eastern Antarctic ice-sheet, and/or with the initiation of NADW circulation in the southern hemisphere (Kennett, 1982).…”

Section: Inactive Stage (Uu)mentioning

confidence: 99%

Giant mounded drifts in the Argentine Continental Margin: Origins, and global implications for the history of thermohaline circulation

Hernández-Molina

Paterlini

Somoza

et al. 2010

Marine and Petroleum Geology

108

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“…Previous workers have applied AMS to sediment samples to determine relative current strength Ledbetter, 1977, 1979;Joseph et al, 1998Joseph et al, , 2004Hassold et al, 2006), but few have applied this method to determine paleodirections of current flow in sediments (e.g., Ledbetter and Ellwood, 1980;Liu et al, 2001). The high sedimentation rates and Marine Geology 242 (2007) 261 -269 www.elsevier.com/locate/margeo high concentration of terrigenous material at the drifts along the Antarctic Peninsula (Acton et al, 2002;Hassold, 2006 Chapters 3 and 4) present an opportunity to explore this potentially powerful aspect of fabric study.…”

Section: Introductionmentioning

confidence: 99%

Paleocurrent directions from paleomagnetic reorientation of magnetic fabrics in deep-sea sediments at the Antarctic Peninsula Pacific margin (ODP Sites 1095, 1101)

Parés¹,

Hassold²,

Rea³

et al. 2007

Marine Geology

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Neogene history of the Deep Western Boundary Current at Rekohu sediment drift, Southwest Pacific (ODP Site 1124)

Cited by 33 publications

References 48 publications

Variations in sediment transport at the central Argentine continental margin during the Cenozoic

Variations in sediment transport at the central Argentine continental margin during the Cenozoic

Giant mounded drifts in the Argentine Continental Margin: Origins, and global implications for the history of thermohaline circulation

Paleocurrent directions from paleomagnetic reorientation of magnetic fabrics in deep-sea sediments at the Antarctic Peninsula Pacific margin (ODP Sites 1095, 1101)

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