The role of gravity and aeromagnetic data in mapping mega Gondwana crustal lineaments: The Argentina‐Brazil‐Algeria (ABA) lineament

Fairhead, J.D.; Bournas, Nasreddine; Raddadi, M. C.

doi:10.1190/1.2792516

Cited by 4 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…17 and 15). Velocity increases of similar magnitude, albeit with a different timing, are reported by Torsvik et al (2009); Nürnberg and Müller (1991).…”

Section: 4supporting

confidence: 83%

“…For the Equatorial Atlantic rift, we evaluated syn-rift phase onset times between 140 Ma and 132 Ma (Top 955 Valanginian). Additionally, we included the plate model of Nürnberg and Müller (1991) with forced breakup at 112 Ma ("NT91"; Torsvik et al, 2009) in our comparison. Flowlines for each alternative scenario were plotted and evaluated against observed lineations and fracture zone patterns 960 of filtered free-air gravity.…”

Section: Kinematic Scenariosmentioning

confidence: 99%

“…Along the EqRs, Azevedo (1991) describes a set of transpressional structures in the Barreirinhas Basin which caused folding of Albian and older strata and reports 50-120 km of dextral strike slip along the Sobradinho Fault in the proximal Barrerinhas basin, pointing towards an early dextral displacement. With the changed kinematics, SAm now rotates clockwise around NWA, causing transtensional opening of basins in the eastern part of the EqRS and about 20 km of transpression along the Demerara Rise and Guinea Plateau at the western end of the EqRS.…”

Section: 4mentioning

confidence: 99%

“…Abbreviations are Abs -absolute reference frame, SAf -Southern Africa, NEA -Northeast Africa, NWA -Northwest Africa, Sal -Salado Subplate, NPM -North Patagonian massif block, CM -Mesozoic magnetic anomaly chron, y -young, o -old. magnetic anomaly timescale after Gee and Kent (2007) (1991) with forced breakup at 112 Ma after Torsvik et al (2009)…”

mentioning

confidence: 99%

“…km long, continent-wide shear zone, reaching from NE Brazil down into northern Argentina (Aslanian andMoulin, 2010;Moulin et al, 2009;Fairhead et al, 2007). Along undulating lineaments such as the TBL, any strike-slip motion would have resulted in a succession of restraining and…”

mentioning

confidence: 99%

See 4 more Smart Citations

Kinematics of the South Atlantic rift

2013

View full text Add to dashboard Cite

The South Atlantic rift basin evolved as branch of a large Jurassic-Cretaceous intraplate rift zone between the African and South American plates during the final breakup of western Gondwana. By quantitatively accounting for crustal deformation in the Central and West African rift zone, we indirectly construct the kinematic history of the pre-breakup evolution of the conjugate West African-Brazilian margins. Our model suggests a causal link between changes in extension direction and velocity during continental extension and the generation of marginal structures such as the enigmatic Pre-salt sag basin and the S\~ao Paulo High. We model an initial E-W directed extension between South America and Africa (fixed in present-day position) at very low extensional velocities until Upper Hauterivian times ($\approx$126 Ma) when rift activity along in the equatorial Atlantic domain started to increase significantly. During this initial $\approx$17 Myr-long stretching episode the Pre-salt basin width on the conjugate Brazilian and West African margins is generated. An intermediate stage between 126.57 Ma and Base Aptian is characterised by strain localisation, rapid lithospheric weakening in the equatorial Atlantic domain, resulting in both progressively increasing extensional velocities as well as a significant rotation of the extension direction to NE-SW. Final breakup between South America and Africa occurred in the conjugate Santos--Benguela margin segment at around 113 Ma and in the Equatorial Atlantic domain between the Ghanaian Ridge and the Piau\'i-Cear\'a margin at 103 Ma. We conclude that such a multi-velocity, multi-directional rift history exerts primary control on the evolution of this conjugate passive margins systems and can explain the first order tectonic structures along the South Atlantic and possibly other passive margins.Comment: 46 Pages, 22 figures. Submitted to Solid Earth (http://www.solid-earth.net). Abstract shortened due to arXiv restrictions. New version contains revisions and amendments as per reviewers requests. Supplementary data is available at http://datahub.io/en/dataset/southatlanticrif

show abstract

“…17 and 15). Velocity increases of similar magnitude, albeit with a different timing, are reported by Torsvik et al (2009); Nürnberg and Müller (1991).…”

Section: 4supporting

confidence: 83%

Section: Kinematic Scenariosmentioning

confidence: 99%

Section: 4mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Kinematics of the South Atlantic rift

2013

View full text Add to dashboard Cite

show abstract

Tectonic evolution and subsidence history of the Cretaceous basins in southern Egypt: The Komombo Basin

Ali

Abdelhady³

et al. 2022

Basin Research

View full text Add to dashboard Cite

The structure and tectonic evolution of the Cretaceous rift basins of southern Egypt are poorly understood. In this study, the tectonostratigraphy of the Komombo Basin has been determined using seismic, well and biostratigraphic data. The tectonostratigraphy of the basin is compared to the Kharit, Nuqra and Beni Suef basins in Egypt as well as Muglad Basin in Sudan. The Komombo Basin is a 58 km long, 28 km wide NW–SE trending half‐graben infilled with 2200 m of Berriasian‐Maastrichtian sediments and overlain by 400 m of Pliocene sediments. Four Berriasian to Maastrichtian syn‐rift and post‐rift sequences and three Pliocene channel systems of Nile sediments have been identified. Moreover, a series of normal faults, negative flower structures, reverse faults and folds are mapped in the basin. Backstripping reveals two rift phases during the Berriasian‐Barremian and Turonian‐Santonian, respectively. Additionally, the tectonic subsidence curves indicate that two major unconformities have occurred during the Aptian‐Albian and Maastrichtian‐Pliocene, which are correlated with a basement uplift during the Albian‐Cenomanian and the Oligocene‐Miocene flank uplift related to the opening of the Red Sea, respectively. The rift episodes are attributed to far‐field stress changes resulting from the initial opening of the South Atlantic and followed by the NW part of the African plate colliding and anticlockwise rotating into Europe. The highest β factors (1.20–1.11) for both rift phases are found at the centre of the basin. The rift phases thinned the crust from 32.5 to 28.2 km and 31.9 km in the depocenter and the western flank of the basin. The Komombo Basin has a similar rift history, stratigraphy and structural style to the Kharit, Nuqra and Mugland basins. All of these basins witnessed two major rift phases in the Early and Late Cretaceous, whereas the Beni Suef Basin encountered strike‐slip tectonic events in the Late Cretaceous.

show abstract

Mapping the complexity of transform margins

Markwick

Paton²,

Mortimer

2022

View full text Add to dashboard Cite

Transform margins are a function of the pre-existing crustal architecture (pre-transform) and the interplay of syn- and post-transform geodynamic processes. We use a suite of geospatial databases to investigate four transform margins: East Africa (Davie Deformational Zone, DDZ), Equatorial Africa, and the South African and Falkland (Malvinas) margins (Agulhas-Falkland Fracture Zone, AFFZ). The East African margin is the most complex of the four. This is a consequence of Late Jurassic - Early Cretaceous transform motion affecting highly heterogeneous crust, and post-transform deformation that varies along the margin. Equatorial Africa most closely adheres to traditional definitions of “transform margins”, but actually comprises two principal transform systems - the Romanche and St. Pauls, dictated by the pre-transform distribution of mobile belts and West African craton. All four margins are spatially associated with volcanism, and each exhibits narrow uplifts associated with transpression or transtension. But the causal relationship of these features with transform processes differ. Volcanism along the East African margin is pre- and post-transform. Syn-transform volcanism on the AFFZ is spatially limited, with the AFFZ possibly acting as a conduit for magmatism rather than as a causal driver. Transform margins are varied and complex and require an understanding of pre-, syn- and post-transform geodynamics.

show abstract

The role of gravity and aeromagnetic data in mapping mega Gondwana crustal lineaments: The Argentina‐Brazil‐Algeria (ABA) lineament

Cited by 4 publications

References 7 publications

Kinematics of the South Atlantic rift

Kinematics of the South Atlantic rift

Tectonic evolution and subsidence history of the Cretaceous basins in southern Egypt: The Komombo Basin

Mapping the complexity of transform margins

Contact Info

Product

Resources

About