Successive sedimentary recycling regimes in southwestern Gondwana: Evidence from detrital zircons in Neoproterozoic to Cambrian sedimentary rocks in southern Africa

Andersen, Tom; Elburg, Marlina; Niekerk, H.S. Van; Ueckermann, Henriëtte

doi:10.1016/j.earscirev.2018.04.001

Cited by 46 publications

(44 citation statements)

References 87 publications

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“…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 Sedimentsmentioning

confidence: 98%

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 Sedimentsmentioning

confidence: 98%

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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“…Comparison of detrital zircon ages of metasedimentary rocks with similar depositional age in the Chinese CTB and Yili Block (this study; Huang et al, ), Tarim Craton (He, Zhu, & Ge, ; He, Zhu, Ge, Zheng, & Wu, ), North China Craton (Luo et al, ; Wan et al, ; Xia, Sun, Zhao & Luo, ; Xia, Sun, Zhao, Wu, et al, ), Siberian Craton (Glorie et al, ; Khudoley et al, ; Powerman et al, ), Amazonian Craton (Babinski et al, 2013; Geraldes et al, ), Yangtze Block (Wang et al, ; Yang et al, ), Cathaysia Block (Yao et al, ; Yu et al, , ), African (Anderson et al, ; Babinski, et al, ; Foster et al, ; Konopásek et al, ; Linol et al, ), Antarctican (Grew et al, ; Marschall et al, ; Takamura et al, ; Wang et al, ), and Indian blocks (Collins et al, ; Dharmapriya et al, ; Li et al, ; Plavsa et al, 2012).…”

Section: Discussionmentioning

confidence: 61%

“…2.4–2.5 and 3.5 Ga with only inconspicuous peak at 1.4–1.6 Ga (Figure f; Wang et al, ; Yang et al, ). For the same reasons, the African (Figure h; Anderson et al, ; Babinski et al, ; Foster et al, ; Konopásek et al, ; Linol et al, ), Antarctican (Figure l; Grew et al, ; Marschall et al, ; Takamura et al, ; Wang et al, ), Indian (Figure j; Collins et al, ; Dharmapriya et al, ; Li et al, ; Plavsa et al, ), and Australian blocks (Figures b–d; Smits et al, , and references therein) are also excluded for the CTB's origin. For the Cathaysia Block, it has an age peak at 1.21 Ga (Figure g; Yao et al, ; Yu et al, , ), which is not present in the CTB.…”

Section: Discussionmentioning

confidence: 94%

From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

et al. 2019

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The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1.0, 1.13, 1.34, 1.4-1.6, 1.75, and 2.6 Ga. Few zircons are detected between 2.0 and 2.5 Ga. The Paleoproterozoic to Neoproterozoic detrital zircons have Hf isotopic compositions (−22.1 to +13.0) similar to those of coeval magmatic rocks in the CTB, indicating a proximal provenance. These results, together with the geological evidence and the presence of 1.4 Ga orogenic granitoids in the CTB, rule out most cratons as the CTB sources but support a Fennoscandia ancestry. Zircon U-Pb ages and Hf isotopic compositions from the CTB and Fennoscandia suggest that from 1.8 to 1.4 Ga, the ε Hf (t) values increased toward more positive values, consistent with an exterior orogen characteristic that the lower crust was replaced by a juvenile arc crust. In contrast, from 1.4 to 0.9 Ga, zircon ε Hf (t) values decreased to more negative values, reflecting an interior orogen, characterized by enhanced contribution of recycled crustal material from collided continental fragments. This marked shift most likely reflected a transition from breakup of Nuna to assembly of Rodinia, accomplished by a transformation from an exterior orogen to an interior one.

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“…6). However, Hfdata reported from the Nama Group (Andersen et al 2018b) covers the same range of εHf values as the modern Orange River sand. Therefore, it is possible that a certain amount of the Cambrian-Ediacaran zircon of the lower Orange derived from the north via the Fish River and its tributaries.…”

Section: Detrital Zircon Age Patterns and Hf-isotopesmentioning

confidence: 83%

Implications for sedimentary transport processes in southwestern Africa: a combined zircon morphology and age study including extensive geochronology databases

Gärtner

Hofmann

Zieger

et al. 2021

Int J Earth Sci (Geol Rundsch)

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Extensive morphological and age studies on more than 4600 detrital zircon grains recovered from modern sands of Namibia reveal complex mechanisms of sediment transport. These data are further supplemented by a zircon age database containing more than 100,000 single grain analyses from the entire southern Africa and allow for hypothesising of a large Southern Namibian Sediment Vortex located between the Damara Orogen and the Orange River in southern Namibia. The results of this study also allow assuming a modified model of the Orange River sand highway, whose origin is likely located further south than previously expected. Moreover, studied samples from other parts of Namibia give first insights into sediment movements towards the interior of the continent and highlight the potential impact of very little spatial variations of erosion rates. Finally, this study points out the huge potential of detrital zircon morphology and large geo-databases as an easy-to-use additional tool for provenance analysis.

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Successive sedimentary recycling regimes in southwestern Gondwana: Evidence from detrital zircons in Neoproterozoic to Cambrian sedimentary rocks in southern Africa

Cited by 46 publications

References 87 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

From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

Implications for sedimentary transport processes in southwestern Africa: a combined zircon morphology and age study including extensive geochronology databases

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