Evidence for the Opening of the South Atlantic in the Early Cretaceous

Larson, Roger L.; Ladd, John W.

doi:10.1038/246209a0

Cited by 181 publications

(76 citation statements)

References 15 publications

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“…Fossil-bearing sedimentary successions from the deepest cores at Sites 361 and 363, substantiate the paleomagnetic calibrations of Larson and Ladd (1973) placing the M-O anomaly within the Aptian stage of the Early Cretaceous. The Cape Basin lineations extend from Anomaly M-O back to Anomaly M-10N which, based on published DSDP results from Leg 32 in the Pacific Ocean (Larson, Moberly, et al, 1975) and preliminary observations on Leg 43 (Tucholke, Vogt, et al, 1975) in the North Atlantic, has a chronostratigraphic position within either the earliest part of the Hauterivian or within latest Valanginian stage of the Early Cretaceous.…”

Section: Age Of Opening Of the South Atlanticmentioning

confidence: 58%

“…We addressed this objective by targeting Site 361 above Anomaly M-4, and Site 363 on a projection of Anomaly M-O into the Walvis Ridge. We considered the dating of Cape Basin lineations (Larson and Ladd, 1973;Emery et al, 1975a;Mascle and Phillips, 1972) to be of great importance in determining the timing of the opening of the South Atlantic (Valencio and Vilas, 1969;Cox, 1970;Dietz and Holden, 1970;Dingle and Klinger, 1971;Le Pichon and Hayes, 1971;Francheteau and Le Pichon, 1972;Ladd et al, 1973) and the commencement of active ocean floor accretion at an axial spreading center.…”

Section: Specific Scientific Objectivesmentioning

confidence: 99%

See 1 more Smart Citation

Objectives, Principal Results, Operations, and Explanatory Notes of Leg 40, South Atlantic

Ryan¹,

Bolli²,

Foss³

et al. 1978

Initial Reports of the Deep Sea Drilling Project

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Section: Age Of Opening Of the South Atlanticmentioning

confidence: 58%

Section: Specific Scientific Objectivesmentioning

confidence: 99%

Objectives, Principal Results, Operations, and Explanatory Notes of Leg 40, South Atlantic

Ryan¹,

Bolli²,

Foss³

et al. 1978

Initial Reports of the Deep Sea Drilling Project

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“…About 130 Ma ago the continental lithosphere broke apart and generated the South Atlantic Ocean (Brown et al, 1995;Rabinowitz and LaBrecque, 1979;Nürnberg and 10 Müller, 1991;O'Connor and Duncan, 1990;Unternehr et al, 1988;Larson and Ladd, 1973;Talwani and Abreu, 2000;Blaich et al, 2009). These processes were followed by rifting and post-breakup cooling, resulting in several sedimentary basins formed along the margins of the South Atlantic (Séranne and Anka, 2005;Macdonald et al, 2003;Stewart et al, 2000).…”

Section: Geological Backgroundmentioning

confidence: 99%

Variability of geothermal gradient across two differently aged continental volcanic passive margins: The Southwest African and the Norwegian margins

Gholamrezaie

Scheck‐Wenderoth

Sippel

et al. 2017

Preprint

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Abstract. The aim of this study is to investigate the shallow thermal field differences for two differently aged passive continental margins by analyzing regional variations in geothermal gradient and exploring the controlling factors for these variations.Hence, we analyzed two previously published 3D conductive and lithospheric-scale thermal models of the Southwest African and the Norwegian passive margins. These 3D models differentiate various sedimentary, crustal and mantle units and integrate different geophysical data such as seismic observations and the gravity field. We extracted the temperature-depth distributions 5 in 1 km intervals down to 6 km below the upper thermal boundary condition. The geothermal gradient was then calculated for these intervals between the upper thermal boundary condition and the respective depth levels (1, 2, 3, 4, 5, and 6 km below the upper thermal boundary condition). According to our results, the geothermal gradient decreases with increasing depth and shows varying lateral trends and values for these two different margins. We compare the 3D geological structural models and the geothermal gradient variations for both thermal models and show how radiogenic heat production, sediment insulating 10 effect, and thermal LAB depth influence the shallow thermal field pattern. The results indicate an ongoing process of oceanic mantle cooling at the young Norwegian margin compared with the old SW African passive margin that seems to be thermally equilibrated at the present-day.

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“…ago (Larson and Ladd, 1973). The magneticanomaly pattern (Ladd, 1974) and the location of proposed poles of opening (Le Pichon and Hayes, 1971;Francheteau and Le Pichon, 1972) require the rate of spreading to be higher in the south than in the north.…”

Section: Evolution Of Northern South Atlanticmentioning

confidence: 99%

Geologic History and Origin of Sao Paulo Plateau (Southeastern Brazilian Margin), Comparison with the Angolan Margin, and the Early Evolution of the Northern South Atlantic

Kumar¹,

Gambôa²,

Schreiber³

et al. 1977

Initial Reports of the Deep Sea Drilling Project

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The Sào Paulo Plateau is a prominent marginal plateau in the southern Brazilian margin. It is underlain by oceanic crust and is bounded to the north and south by fracture zones. Seismic profiles and drilling data from Site 356 (located on its southeastern corner) indicate that the region occupied by the plateau has acted as a depocenter and has evolved as a marginal plateau since the Aptian time. The Oceanographic conditions and depositional environments prevailing over the plateau during its early evolution were almost identical to those suggested

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Evidence for the Opening of the South Atlantic in the Early Cretaceous

Cited by 181 publications

References 15 publications

Objectives, Principal Results, Operations, and Explanatory Notes of Leg 40, South Atlantic

Objectives, Principal Results, Operations, and Explanatory Notes of Leg 40, South Atlantic

Variability of geothermal gradient across two differently aged continental volcanic passive margins: The Southwest African and the Norwegian margins

Geologic History and Origin of Sao Paulo Plateau (Southeastern Brazilian Margin), Comparison with the Angolan Margin, and the Early Evolution of the Northern South Atlantic

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