Tectonics and stratigraphy of the East Brazil Rift system: an overview

Chang, Hung Kiang; Kowsmann, Renato Oscar; Figueiredo, António; Bender, AndréAdriano

doi:10.1016/0040-1951(92)90253-3

Cited by 415 publications

(67 citation statements)

References 44 publications

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“…The seismic stratigraphy of the Espírito Santo Basin is depicted in Figure 4 and correlated with published information from Chang et al (1992), Mohriak et al (1995), Viana et al (2003), and Fiduk et al (2004). In the Santos Basin, seismic megasequences have been correlated with main tectonic phases and subdivided in 10 main units (Mohriak et al, 1995).…”

Section: Seismic Stratigraphymentioning

confidence: 92%

“…Published well data from Deep Sea Drilling Project (DSDP) sites 355/356 (Kumar et al, 1977) and 515 (Barker, 1983;Barker et al, 1983), plus the works by Bruhn and Walker (1997), Chang et al (1992), Meisling et al, (2001), Viana et al (2003), and Fiduk et al (2004), were used in the identification and relative dating of the main seismic-stratigraphic units and depositional facies forming the continental slope of southeast Brazil.…”

Section: Methodsmentioning

confidence: 99%

“…The geometry, internal character, and relative stratigraphic position of unit K1/K2 relate it to synrifts II and III of Chang et al (1992). Onshore, K1/K2 comprises alternating sandy and clayey strata representing deposition in continental to fluvial environments (Bruhn and Walker, 1997).…”

Section: Unit K1/k2: Berriasian To Lower Aptianmentioning

confidence: 99%

“…Unit J/K comprises low to moderate amplitude reflections of low frequency. At outcrop, J/K includes Upper Jurassic to Berriasian strata (synrift I, Chang et al, 1992), comprising fluvial siliciclastic units, conglomeratic deposits of alluvial origin, and thick successions of red shales (Bruhn and Walker, 1997).…”

Section: Unit J/k: Upper Jurassic To Berriasianmentioning

confidence: 99%

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Faulting of salt-withdrawal basins during early halokinesis: Effects on the Paleogene Rio Doce Canyon system (Espírito Santo Basin, Brazil)

2009

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A B S T R A C TThree-dimensional seismic-reflection data are used in the analysis of submarine channel systems in the Espírito Santo Basin, Brazil. The exceptional quality of the studied data set allows the detailed documentation of the geometry, regional distribution, and statistical parameters of salt-related normal faults, and their effect on the Rio Doce Canyon system (RDCS). On the Espírito Santo continental slope, normal faulting was triggered during early halokinesis (stage A) but barely controlled the initial evolution of the RDCS, which incised the continental slope axially within a salt-withdrawal basin. However, in a second stage (stage B), crestal or radial faults controlled erosion over growing salt structures, whereas synclinal and channelmargin fault sets dissected overbank strata to the RDCS. In the later part of stage B, channel sinuosity decreased sharply in response to fault activity and associated sea-floor destabilization. Vertical propagation of blind faults was triggered in a third stage (stage C), in association with crestal collapse of buried salt anticlines and regional diapirism, but synclinal and channel-margin faults did not propagate vertically above a regional unconformity marking the base of stage C strata. Statistical analyses of observed fault sets demonstrate that synclinal faults are in average 2.3 times longer than the crestal or radial types but record 60% of the throw (average 83 m [272 ft]) experienced by the latter. In addition, the Tiago is a research lecturer at Cardiff University. After completing his Ph.D. in geology at the University of Manchester, he worked in Portugal and then Greece through the umbrella of European Union projects (EURODOM and HERMES) dedicated to the study of continental margins. His research interests include the study of deep-water rift basins and overlying postrift successions. He is particularly interested in investigating the way tectonics influences sedimentation using novel statistical methods, petrophysical, and 3-D seismic data.Joe received his B.A. and D.Phil degrees in geology from Oxford University. He is a research professor of geophysics and the director of the 3-D Lab at Cardiff University. His research interests focus on 3-D seismic interpretation in basin analysis, with special emphasis on seal integrity analysis, the genesis of polygonal faults, the emplacement of sandstone and igneous intrusions, and silica diagenesis.Richard is a professor of petroleum geoscience and the director for the Center for Research into Earth Energy Systems at Durham University. He was formerly at ExxonMobil for 8 years. He has published more than 40 articles on the use of 3-D seismic data for understanding sedimentary, fluid flow, structural, igneous, and diagenetic processes in basins.fault sets are shown to have contributed to local cannibalization of the sea floor, vertical stacking of channel-fill strata, and structural and depositional compartmentalization of potential reservoir successions. As a result, channel systems show marked differences in ...

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Section: Seismic Stratigraphymentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Unit K1/k2: Berriasian To Lower Aptianmentioning

confidence: 99%

Section: Unit J/k: Upper Jurassic To Berriasianmentioning

confidence: 99%

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Faulting of salt-withdrawal basins during early halokinesis: Effects on the Paleogene Rio Doce Canyon system (Espírito Santo Basin, Brazil)

2009

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“…Rabinowitz & LaBrecque 1979;Austin & Uchupi 1982;Nürn-berg & Müller 1991;Chang et al 1992). The link between the South and Central segments of the South Atlantic was established by Albian-Turonian times (Koutsoukos & Dias-Brito 1987;Koutsoukos et al 1991).…”

mentioning

confidence: 95%

Crustal-scale architecture and segmentation of the South Atlantic volcanic margin

Blaich

Faleide

Tsikalas

et al. 2013

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Seismic reflection and refraction profiles, and potential field data, complemented by crustal-scale gravity modelling, plate reconstructions and well cross-sections are used to study the evolution of the South Segment of the South Atlantic conjugate margins. Distinct alongmargin structural and magmatic changes that are spatially related to a number of conjugate transfer systems are revealed. The northern province, between the Rio Grande Fracture Zone and the Salado Transfer Zone, is characterized by symmetrical seawards-dipping reflections (SDRs) and symmetrical continent-ocean transitional domain. The central province, between the Salado Transfer Zone and the conjugate Colorado-Hope transfer system, is characterized by along-strike tectonomagmatic asymmetry. The Tristan da Cunha plume, located on the central province of the South Segment, may have influenced the volume of magmatism but did not necessarily alter the process of rifted margin formation. Thus implying that, apart from voluminous magmatism, the extensional evolution of the central province of the South Segment may have much in common with 'magma-poor' margins.

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Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

Chaves

Ussami

Ritsema

2016

Geochem Geophys Geosyst

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We estimate density and P‐wave velocity perturbations in the mantle beneath the southeastern South America plate from geoid anomalies and P‐wave traveltime residuals to constrain the structure of the lithosphere underneath the Paraná Magmatic Province (PMP) and conterminous geological provinces. Our analysis shows a consistent correlation between density and velocity anomalies. The P‐wave speed and density are 1% and 15 kg/m3 lower, respectively, in the upper mantle under the Late Cretaceous to Cenozoic alkaline provinces, except beneath the Goiás Alkaline Province (GAP), where density (+20 kg/m3) and velocity (+0.5%) are relatively high. Underneath the PMP, the density is higher by about 50 kg/m3 in the north and 25 kg/m3 in the south, to a depth of 250 − 300 km. These values correlate with high‐velocity perturbations of +0.5% and +0.3%, respectively. Profiles of density perturbation versus depth in the upper mantle are different for the PMP and the adjacent Archean São Francisco (SFC) and Amazonian (AC) cratons. The Paleoproterozoic PMP basement has a high‐density root. The density is relatively low in the SFC and AC lithospheres. A reduction of density is a typical characteristic of chemically depleted Archean cratons. A more fertile Proterozoic and Phanerozoic subcontinental lithospheric mantle has a higher density, as deduced from density estimates of mantle xenoliths of different ages and composition. In conjunction with Re‐Os isotopic studies of the PMP basalts, chemical and isotopic analyses of peridodite xenoliths from the GAP in the northern PMP, and electromagnetic induction experiments of the PMP lithosphere, our density and P‐wave speed models suggest that the densification of the PMP lithosphere and flood basalt generation are related to mantle refertilization. Metasomatic refertilization resulted from the introduction of asthenospheric components from the mantle wedge above Proterozoic subduction zones, which surrounded the Paraná lithosphere. The high‐density PMP lithosphere is presently gravitationally unstable and prone to delamination.

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Tectonics and stratigraphy of the East Brazil Rift system: an overview

Cited by 415 publications

References 44 publications

Faulting of salt-withdrawal basins during early halokinesis: Effects on the Paleogene Rio Doce Canyon system (Espírito Santo Basin, Brazil)

Faulting of salt-withdrawal basins during early halokinesis: Effects on the Paleogene Rio Doce Canyon system (Espírito Santo Basin, Brazil)

Crustal-scale architecture and segmentation of the South Atlantic volcanic margin

Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

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