The Permo-Carboniferous Dwyka Group of the Aranos Basin (Namibia) – How detrital zircons help understanding sedimentary recycling during a major glaciation

Zieger, Johannes; Rothe, J.; Hofmann, Mandy; Gärtner, Andreas; Linnemann, Ulf

doi:10.1016/j.jafrearsci.2019.103555

Cited by 20 publications

(47 citation statements)

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“…Nevertheless, high degrees of zircon roundness points to (re-) recycling and shows no evidence of input of fresh basement material (Zoleikhaei et al 2016). Furthermore, the degree of roundness for zircon grains of this study are different from zircon roundness values obtained by Zieger et al (2019) for the Dwyka Group sediments of the Aranos Basin. Simple visual inspection the Ɛ Hf (t) values of the Namibian and South African (Main Karoo Basin) of the detrital zircon age vs the Hf isotope patterns reveal an extensive similarity between both Karoo strata distribution areas (Fig.…”

Section: Recycling Dynamics Of the Mesozoic Sedimentscontrasting

confidence: 83%

“…Recent studies conducted by Andersen et al (2016b), Andersen et al (2018a) and Orejana et al (2015) concluded biased results of conventional zircon studies assuming a direct pathway of sediment source to sediment sink not taking into account repeated sedimentary recycling events obscuring such 'source-to-sink' dynamics. A similar effect has also been suggested by Vorster (2014) and Zieger et al (2019) for the lower Karoo-aged strata (Dwyka Group) of the Main Karoo and Aranos basins.…”

Section: Recycling Dynamics Of the Mesozoic Sedimentssupporting

confidence: 81%

“…Both possibilities are not mutually exclusive and the obtained zircon morphologies may be the result of a combination of both processes. An apparent disparity in zircon grain roundness was also observed by Zieger et al (2019) for the Dwyka Group sediments of the Aranos Basin. In contrast, all remaining samples show fairly rounded grains clearly indicating intensive grain/sediment movement either by transport over long distances or by permanent local sediment regrouping and movement.…”

Section: Recycling Dynamics Of the Mesozoic Sedimentsmentioning

confidence: 54%

“…1a). Deglaciation and ice sheet collapse was induced by a continuous northward drift of southwestern Gondwana out of the polar and sub-polar regions towards lower latitudes (Visser 1995), causing intense sedimentary recycling of older strata (Zieger et al 2019). Cold, wet conditions prevailed at least during the early Permian, enabling the occurrence of peat deposits, which developed at the fluviodeltaic basin margins (Miller 2008).…”

Section: Evolution Of the Southwestern Gondwanan Mesozoic Successionsmentioning

confidence: 99%

“…Dickinson et al 1983;Gehrels et al 2000;Ross et al 1992). Up to date, little progress has been made, regarding detrital zircon studies dealing with Namibian Karoo-aged successions in the studied area (Jansson 2010;Zieger et al 2019). The lack of provenance studies on other southern African Paleozoic to Mesozoic strata is also apparent (Andersen et al 2016b;Bowden 2013;Veevers and Saeed 2007;Viglietti et al 2018), which in contrast to the importance of the Karoo-aged sediments, as they may play a central role in the integrated recycling model for the southern African region proposed by Andersen et al (2019b), questioning classic source-to-sink dynamics.…”

Section: Introductionmentioning

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: Recycling Dynamics Of the Mesozoic Sedimentscontrasting

confidence: 83%

Section: Recycling Dynamics Of the Mesozoic Sedimentssupporting

confidence: 81%

Section: Recycling Dynamics Of the Mesozoic Sedimentsmentioning

confidence: 54%

Section: Evolution Of the Southwestern Gondwanan Mesozoic Successionsmentioning

confidence: 99%

Section: Introductionmentioning

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 Late Palaeozoic Ice Age unconformity in southern Namibia viewed as a patchwork mosaic

Heron

Kettler

Griffis

et al. 2021

The Depositional Record

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Zircon provenance of Quaternary cover beds using U–Pb dating: Regional differences in the Southwestern USA

Richter‐Krautz

Hofmann

Zieger

et al. 2021

Earth Surf Processes Landf

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U-Pb dating of detrital zircons (DZ) in Quaternary slope deposits (cover beds) and examination of the surface structure of single zircon grains may enable reconstruction of the provenance of their aeolian components and help to reconstruct sedimentary palaeo-transportation cascades. We distinguish several layers of slope deposits (cover beds) using a palaeosol-supported sequence-stratigraphic approach. In a pilot study, we demonstrate the usability of using end-member-modelled analyses of grain sizes to identify the aeolian matter, multi-dimensional scaling and density functions (probability density functions (PDF) and Kernel density estimations (KDE)) of the U-Pb data, and the grain morphology of DZ, and show that the age and appearance variation of DZ in the Great Basin differ remarkably from those of the Colorado Plateau.All samples contain aeolian matter. Density functions of the DZ ages show similarities within each of the two regions. The Great Basin samples are dominated by late Cretaceous and Paleogene zircons, which are assumed to derive from volcanism. In contrast, the Colorado Plateau samples are almost free of these contributions. Presumably, the difference is due to palaeolakes, which were frequent in the Great Basin only, whose sediments contain a similar spectrum of DZ ages. Zircon morphology indicates that most grains have a history of aeolian transportation, whereas the grains assumed to be of volcanic origin often do not show similar transportation marks; this indicates that their transportation was dominated by the eruptive process but fewer steps of a transportation cascade. Multidimensional scaling of age data defines clusters of samples with similar DZ ages andcompared with published ages from possible sourcesallows first interpretations of provenance. Quaternary aeolian sediments have not been studied in, and the applied mix of methods has not been applied to, the southwestern USA before. We demonstrate their feasibility for this study area.

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The Permo-Carboniferous Dwyka Group of the Aranos Basin (Namibia) – How detrital zircons help understanding sedimentary recycling during a major glaciation

Cited by 20 publications

References 100 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

The Late Palaeozoic Ice Age unconformity in southern Namibia viewed as a patchwork mosaic

Zircon provenance of Quaternary cover beds using U–Pb dating: Regional differences in the Southwestern USA

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