2000
DOI: 10.1016/s0264-8172(00)00006-4
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Role of subaerial volcanic rocks and mantle plumes in creation of South Atlantic margins: implications for salt tectonics and source rocks

Abstract: Seaward-dipping re¯ectors (SDRs) represent¯ood basalts rapidly extruded during either rifting or initially subaerial sea-¯oor spreading. Evaporites can form on this basaltic proto-oceanic crust, as in the Afar Triangle today. Evidence for SDRs in South Atlantic deep-water regions comes from proximity to the uniquely large Parana ±Etendeka volcanic province onshore, the Tristan and Gough hot spots, drilled volcanic rocks, and seismic pro®les showing SDR provinces more than 100 km wide, as much as 7 km thick, a… Show more

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Cited by 175 publications
(159 citation statements)
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“…Furthermore, there are no gravimetric or magnetic data indicating the existence of substantial syn-rift magmatic province in the area. The bathymetric high on profile GA3 is interpreted as a magmatic structure of limited extension, similar to other extrusive magmatic bodies already identified in the area (Jackson, 2000), but volcanism is not considered as a major process for the formation of the margin (Moulin et al, 2005). We therefore question, for Below the seaward tilted syn-rift sediments, one can observe a continental crust characterized by flat reflectors that present a low amplitude (3 to 5 km) and long wavelength (10 to 50 km) undulation.…”
Section: Iicb Interpretationsupporting
confidence: 75%
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“…Furthermore, there are no gravimetric or magnetic data indicating the existence of substantial syn-rift magmatic province in the area. The bathymetric high on profile GA3 is interpreted as a magmatic structure of limited extension, similar to other extrusive magmatic bodies already identified in the area (Jackson, 2000), but volcanism is not considered as a major process for the formation of the margin (Moulin et al, 2005). We therefore question, for Below the seaward tilted syn-rift sediments, one can observe a continental crust characterized by flat reflectors that present a low amplitude (3 to 5 km) and long wavelength (10 to 50 km) undulation.…”
Section: Iicb Interpretationsupporting
confidence: 75%
“…Limited southward by the Walvis Ridge, the Namibe margin is located at the southern end of the post-rift evaporites that cover most of the central segment of the South Atlantic (Jackson et al, 2000;Karner and Gambôa, 2007;Heine et al, 2013). The Namibe margin is extremely narrow in comparison with its conjugate Brazilian margin (Mohriak et al, 1995;Mohriak et al, 2008;Aslanian et al, 2009;Mohriak et al, 2012;Mello et al, 2013;Moulin et al, 2013).…”
Section: Iiba Observationsmentioning
confidence: 99%
“…This mechanism resulted in massive salt walls separated by an incipient spreading center, in a process similar to what is observed in the Red Sea margins, where the initial continuous salt layer is ruptured by the spreading center, but is still questionable for the South Atlantic (e.g., Girdler & Whitmarsh 1973;Jackson et al 2000;). On the contrary, there is no salt in the continent-ocean transition in the Iberian margin.…”
Section: " "mentioning
confidence: 70%
“…The asymmetry in the crustal structure of the conjugate margins, as well as a complicated tectonic interplay of magmatism and geological features, like lineaments and/or metamorphic rocks (eclogites) inherited from the Caledonides, suggests a complex rifting evolution and postrift events (Voss and Jokat, 2007;Mjelde et al, 2003). The timing of South Atlantic opening was diachronous, progressing from south to north (Austin and Uchupi, 1982;Blaich et al, 2011;Franke, 2013;Franke et al, 2007;Jackson et al, 2000;Rabinowitz and LaBrecque, 1979;Sibuet et al, 1984;Koopmann et al, 2014a). The use of seafloor magnetic anomalies to date this process is complicated by uncertainties in anomaly picks for the southern margins.…”
Section: Geologic Frameworkmentioning
confidence: 99%