Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

Lovecchio, Juan Pablo; Rohais, Sébastien; Joseph, Philippe; Bolatti, Néstor D.; Ramos, Víctor A.

doi:10.1016/j.earscirev.2020.103138

Cited by 59 publications

(43 citation statements)

References 171 publications

(309 reference statements)

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“…AS Angola Shield, KI Kamanjab Inlier, KB Kaoko Belt, DB Damara Belt, CKB Choma-Kaloma Block, RP Rehoboth Province, NS Namaqua Sector, GB Gariep Belt structures. The chronostratigraphic framework of the Upper Triassic to Lower Cretaceous basin development is poorly understood, as of a lack in datable marine fossils (Lovecchio et al 2020). Following Frizon de Lamotte et al 2015and Lovecchio et al (2020) a two-step scenario is possible: The first group of basins (Karoo I) comprises all NE-trending Carboniferous to Triassic depocenters (Aranos and Waterberg) may be related to subduction dynamics of the paleo-Pacific plate beneath SW Gondwana; and the second group (Karoo II) comprises the Jurassic to Lower Cretaceous depocenters may be related to the Karoo plume (Bouvet Hotspot).…”

Section: Evolution Of the Southwestern Gondwanan Mesozoic Successionsmentioning

confidence: 99%

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Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon

Zieger

Harazim

Hofmann

et al. 2020

Int J Earth Sci (Geol Rundsch)

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The Namibian Mesozoic successions may be remnant of a high dynamic sedimentary system that is characterized by multiple stages of sediment accumulation and erosion with contemporaneous homogenization starting with the deposition of the Permo-Carboniferous Dwyka Group strata and continues at least until the Lower Cretaceous. The Lower Cretaceous sedimentary system is interpreted to have involved at least an area covering the whole SW Gondwana, documenting the sedimentary history during the evolution from an ice house environment to an arid desert. To test the sediment homogenization hypothesis, we applied a combination of isotopic and morphometric data on detrital zircon grains, as well as whole-rock geochemical data of selected Mesozoic sandstones from Namibia. As a base for the interpretation of the detrital zircon age data we compiled a zircon age dataset with c. 44,000 analyses for the southern African region. All samples reveal a major detrital pan-African zircon age peak of c. 0.5-0.7 Ga sourced from the pan-African magmatic events occurring around the Kalahari Craton margin. The lowermost Triassic is characterized by the occurrence of additional Mesoproterozoic and Paleoproterozoic age peaks of c. 1.0-1.2 Ga and 1.8-2.0 Ga with a majority of zircon grains showing angular shapes. The protosource of these grains is interpreted to possibly be the Namaqua Metamorphic Complex and other Paleoproterozoic structural units deformed in course of the Namaqua orogeny. In contrast, other samples show a prominent Permo-Triassic age peak and completely rounded zircon grains, putatively derived from within the Gondwanides volcanic arc. The disparity in the zircon age pattern may point towards a change in provenance and also a change in the whole system of zircon recycling during the Mesozoic southern Gondwana. The Lower Triassic Neu Loore fm. are constrained to more local bedrock sources and short zircon transport distance. In contrast, zircon grains of the Middle Triassic Omingonde, the Jurassic Etjo und the Cretaceous Twyfelfontein formations are an expression for a major recycling and sediment homogenization system. The system was facilitated by an interplay between fluvial and eolian sedimentary transport systems.

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Section: Evolution Of the Southwestern Gondwanan Mesozoic Successionsmentioning

confidence: 99%

“…With the end of the Paleozoic the amalgamation of Pangea was complete (Ramos 2008). As subjected to continuous subduction, the supercontinent became unstable (Lovecchio et al 2020; and references therein). In the Mesozoic negative inversion affected compressed structures, due to an extensional stress regime (Williams et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon

Zieger

Harazim

Hofmann

et al. 2020

Int J Earth Sci (Geol Rundsch)

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“…The Pelotas basin formed as a result of the break-up of Gondwana and the opening of the South Atlantic Ocean during the Early Cretaceous, related to the last event of a multi-stage extensional history of this continental margin (Lovecchio et al, 2018(Lovecchio et al, , 2020. The post-breakup Cretaceous and Cenozoic successions were deposited in a passive margin setting during the drift phase.…”

Section: Case Study: the Pelotas Basinmentioning

confidence: 99%

“…This part of the western South Atlantic margin has received wide attention in recent years, on a large diversity of topics as margin structure and development (e.g. Blaich et al., 2009; Franke et al., 2007, 2010; Jackson et al., 2000; Lovecchio et al., 2020; Mohriak et al., 2002; Soto et al., 2011; Stica et al., 2014), erosional and depositional products of contour currents (e.g. Creaser et al., 2017; Hernández‐Molina et al., 2009, 2010, 2016), sediment dynamics and slope stability (e.g.…”

Section: Case Study: the Pelotas Basinmentioning

confidence: 99%

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High‐resolution sedimentary budget quantification – Example from the Cenozoic deposits in the Pelotas Basin, South Atlantic

Rohais

Lovecchio²,

Abreu³

et al. 2021

Basin Research

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In this paper, we propose a high-resolution (HR) sedimentary budget quantification at basin-scale for the Cenozoic deposits of the Pelotas Basin (South Atlantic). A new workflow is implemented including five main steps: (1) basin-scale analysis and characterization, (2) quality control and selection of reference 2D dip-sections,(3) HR seismic stratigraphy analysis, (4) sediment supply estimation taking into account lithology and porosity corrections and then (5) the estimation of the sedimentary budget curve including 41 time-intervals for the last 65 Myr. Variance ranges were determined considering the parameters of the method on the case study. The main uncertainties are related to the seismic velocities for the time-to-depth conversion (5%-22%), the method for lithological parameters quantification and associated porosity correction (4.4%-14.3%), the absolute ages of stratigraphic markers (1%-25%), and the proportion of in-situ sediment production (0.3%-0.5%). For the very first time, this method allows the identification of several cycles from an entire sedimentary basin fill characterized by pulses of sediment supply (Qs) whose growth phase lasts less than 1 Myr, followed by a constant phase lasting 1-2 Myr, and finally an exponentially decreasing phase lasting 2-5 Myr. These pulses alternate with phases where the sediment supply was very low for intervals of ca. 1-5 Myr. Ten major pulses were recognized during the Cenozoic. We propose that the sediment supply dynamic in the Pelotas basin records the orogenic phases of the Andes located more than 2,000 km upstream. The recorded Qs pulses in the basin are out of phase with respect to the active tectonic phases of the Central Andes. Finally, by comparing the volume of preserved sediment and the production capacity of the catchment, we suggest that a source of sediment in addition to the Brazilian craton and the Andes should be envisaged, potentially associated with deep-water oceanic circulation.

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Sequence stratigraphy in the Algoa and Gamtoos basins (South Africa): a shoreline’s journey since the Middle Mesozoic

Makhubele

Bordy

2021

Geo-Mar Lett

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Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

Cited by 59 publications

References 171 publications

Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon

Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon

High‐resolution sedimentary budget quantification – Example from the Cenozoic deposits in the Pelotas Basin, South Atlantic

Sequence stratigraphy in the Algoa and Gamtoos basins (South Africa): a shoreline’s journey since the Middle Mesozoic

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