The evolution of rifting on the volcanic margin of the Pelotas Basin and the contextualization of the Paraná–Etendeka LIP in the separation of Gondwana in the South Atlantic

Stica, Juliano Magalhães; Zalán, Pedro Víctor; Ferrari, André Luiz

doi:10.1016/j.marpetgeo.2013.10.015

Cited by 169 publications

(151 citation statements)

References 41 publications

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“…In contrast with the magma-poor margins lying farther north, the Uruguay margin is devoid of post-rift evaporites but is characterized by thick accumulations, up to 8 km, of Seaward Dipping Reflectors (SDR) interpreted as syn-rift volcanic formations (Stica et al, 2014;Franke et al, 2007;Clerc et al, 2015a).…”

Section: Iiaa Observationsmentioning

confidence: 99%

“…(Fig. A C C E P T E D M A N U S C R I P T 4d). The concave-down geometry of the volcanics forming the SDR has sometimes been explained by subsidence models (Mutter et al, 1982;Hinz, 1981;Mutter, 1985), but alternatively, onshore and offshore investigations have pointed out that SDR are synmagmatic roll-over flexures controlled by major continentward dipping normal faults (Brooks & Nielsen, 1982;Planke et al, 2000;Gernigon et al, 2004Gernigon et al, , 2006Geoffroy et al, 2001, Geoffroy, 2001Mjelde et al, 2007;Stica et al, 2014;Pindell et al, 2014).…”

Section: Iiaa Observationsmentioning

confidence: 99%

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Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

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, Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust, (2016), doi: 10.1016/j.gr.2017.04.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T Abstract:The

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Section: Iiaa Observationsmentioning

confidence: 99%

Section: Iiaa Observationsmentioning

confidence: 99%

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

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“…For a more detailed discussion on velocity, density and magnetic parameters, see Ebbing et al (2006Ebbing et al ( , 2009 and Kvarven et al (2014). The modelled parameters for the different stratigraphic units and crystalline crustal types (Table 2) were based on data obtained from basement 2011; Franke, 2012;Péron-Pinvidic et al, 2013;Savva et al, 2014;Stica et al, 2014;Tugend et al, 2014). In particular, this relates to the succession of rifting modes and principal structures, the mechanisms behind largemagnitude crustal thinning, the nature of the continentocean transition and the possibility for altered mantle to constitute parts of the basement in the deep margin.…”

Section: Potential-field Based Crustal Modelmentioning

confidence: 99%

Extension, hyperextension and mantle exhumation offshore Norway: a discussion based on 6 crustal transects

Osmundsen¹,

Péron‐Pinvidic²,

Ebbing³

et al. 2017

NJG

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In spite of its classification as `magmatic´, the rifted margin off Mid Norway evolved as a hyperextended margin in Late Jurassic and Cretaceous time, with a pre-breakup structural evolution that resembles that of magma-poor margins. Because the distal margin was not drilled to crystalline basement, considerable uncertainty exists with respect to the distribution of lithologies at depth. In this contribution, we discuss the implications of various scenarios for deep-seated lithologies and evaluate the possibilities for mantle exhumation in the deep margin offshore Norway. A suite of JurassicCretaceous, very large-magnitude, extensional faults that exhumed successively deeper structural levels seawards are well imaged in recent long-offset seismic reflection data. Based on these key profiles, we document the structural configuration that created the extremely sharply tapered south Møre margin as well as subhorizontal detachment faults in the distal Vøring margin. The latter were associated with rotated extensional allochthon and supradetachment basins and contributed to the exhumation of very deep levels including rocks from the lower crust and/or upper mantle. In the outer margin, truncation and excision of this system by a new set of incising detachment faults occurred later in the Cretaceous and the earliest Cenozoic. We discuss the relationships between these detachment systems under the distal and outer margins and positive structural features such as the Rån and Gjallar ridges. The interpretation of basement lithologies at depth in the distal margin is ambiguous due to overlap in physical properties. Based on a process-oriented evaluation of the different interpretation scenarios, we favour a model where mantle windows were exhumed in the footwalls of some of the master faults in the Cretaceous.

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“…Cape Cross. On the conjugate margin in Argentina and Uruguay, Stica et al (2014) outline how these segments play a fundamental role in ocean spreading and margin development, as well as influencing plate reconstructions (e.g. Moulin et al 2013;Numberg & Muller 1991;Heine et al 2013).…”

Section: Segmentation and Margin Evolutionmentioning

confidence: 99%

Interaction of crustal heterogeneity and lithospheric processes in determining passive margin architecture on the southern Namibian margin

Mohammed

Paton

Collier

et al. 2016

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Abstract:The influence of pre-rift crustal heterogeneity and structure upon the evolution of a continental rift and its subsequent passive margin is explored. The absence of thick Aptian salts in the Namibian South Atlantic allows imaging of sufficient resolution to distinguish different pre-rift basement seismic facies. Aspects of pre-rift basement geometry have been characterized which are then compared with the geometries of Cretaceous rift basin structure, and of subsequent post-rift margin architectural elements. Half-graben depocentres migrate westward within the continental syn-rift phase, at the same time as basin bounding faults become established as hard-linked arrays with lengths of approximately 100 km. The rift-drift transition phase, marked by Seaward Dipping Reflectors, gives way to the early post-rift progradation of clastics off the Namibian coast. In the Late Cretaceous, these shelf clastics are much thicker in the south, reflecting the dominance of the newly formed Orange River catchment as the main sediment entry point on the South African/Namibian margin. Tertiary clastics largely bypass the pre-existing shelf area, revealing a marked basinwards shift in sedimentation. Post-rift megasequence thicknesses do not vary simply according to the location of syn-rift half-grabens and thinned continental crust. Rather, the Namibian margin exemplifies margins influenced by a complex interplay of crustal thinning, pre-rift basement heterogeneity, volcanic bodies and transient dynamic uplift events on the evolution of lithospheric strain and depositional architectures.

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The evolution of rifting on the volcanic margin of the Pelotas Basin and the contextualization of the Paraná–Etendeka LIP in the separation of Gondwana in the South Atlantic

Cited by 169 publications

References 41 publications

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Extension, hyperextension and mantle exhumation offshore Norway: a discussion based on 6 crustal transects

Interaction of crustal heterogeneity and lithospheric processes in determining passive margin architecture on the southern Namibian margin

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