U-Pb and Pb-Pb zircon ages for metamorphic rocks in the Kaoko Belt of Northwestern Namibia: A Palaeo- to Mesoproterozoic basement reworked during the Pan-African orogeny

Kröner, Stephan; Konopásek, Jiřı́; Kröner, Alfred; Passchier, Cees W.; Poller, U.; Wingate, Michael T.D.; Hofmann, K.-H.

doi:10.2113/107.3.455

Cited by 78 publications

(44 citation statements)

References 49 publications

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“…The basement slivers include sectors with granitoid gneisses of c. 2.59-2.65 Ga, c. 1.96-2.03 Ga. c. 1.68-1.78 Ga. c. 1.45-1.52 Ga (5eth et al. 1998;Kroner et al, 2004) and c. 1.2 Ga (Frimmel et al, 2010). Arc-related granites and migmatitic gneisses of 1.73-1.87 Ga have been reported in the pre-Damaran basement of northern Namibia while to the north of the Kaoko belt, there is robust geochronological evidence indicating that Eburnean igneous and metamorphic rocks were affected by a 1320-1340 Ma upper amphibolite fades metamorphism (Seth et al, 2005;Frimmel et al, 2010 and references therein).…”

Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

“…10e) and in the Damara orogen, where the 700-800 Ma peak is well developed (Newstead et al, 2009). Not only are the typical Eburnean and Namaqua components present in the Punta Mogotes pattern, but also the 1420-1560 Ma interval, which is not common in Africa, with a possible igneous protolith of this age only known in the basement of the western and central Kaoko belt (Kroner et al, 2004) (Fig. lOa).…”

Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

“…Until recently, the paucity of early Neoproterozoic ages in the Dom Feliciano belt prevented comparison with the widespread rifting event of the Angola block and western Kalahari sectors (e.g., Kroner et al, 2004). This has been largely overcome by new geochronological data for Neoproterozoic extensional magmatism in the Dom Feliciano Schist Belt (Oyhantc;abaJ et aI., 2009;Saalmann et aI., 2010 and references therein).…”

Section: Relationship To the Dom Felidano Beltmentioning

confidence: 99%

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The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

et al. 2011

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Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

Section: Inferred Source For the Punta Mogotes Formationmentioning

confidence: 99%

Section: Relationship To the Dom Felidano Beltmentioning

confidence: 99%

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The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

et al. 2011

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“…the Congo craton. It is interesting to note that c. 840-800 Ma orthogneisses have been found in the coastal terrane of the Kaoko belt interpreted as related to rifting and continental break-up (Kröner et al 2004;Konopásek et al 2008). The ages correspond to the same time interval of crustal stretching and melting observed in the Porongos belt, in the basement of the Pelotas batholith (recorded in 800-780 Ma zircon xenocrysts and gneiss xenoliths, Silva et al 1997) and in the basement of the Brusque complex farther north in Santa Catarina (Basei et al 2008b).…”

Section: Tectonic Setting Of the São Gabriel Block And The Porongos Beltmentioning

confidence: 99%

Multiple accretion at the eastern margin of the Rio de la Plata craton: the prolonged Brasiliano orogeny in southernmost Brazil

Saalmann

Gerdes

Lahaye

et al. 2010

Int J Earth Sci (Geol Rundsch)

120

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The Neoproterozoic-Eoplalaeozoic Brasiliano orogeny at the eastern margin of the Rio de la Plata craton in southernmost Brazil and Uruguay comprises a complex tectonic history over 300 million years. The southern Brazilian Shield consists of a number of tectono-stratigraphic units and terranes. The São Gabriel block in the west is characterized by c.760-690 Ma supracrustal rocks and calc-alkaline orthogneisses including relics of older, c. 880 Ma old igneous rocks. Both igneous and metasedimentary rocks have positive eNd(t) values and Neoproterozoic TDM model ages; they formed in magmatic arc settings with only minor input of older crustal sources. A trondhjemite from the São Gabriel block intruding dioritc and tonalitic gneisses during the late stages of deformation (D 3 ) yield an U-Pb zircon age (LA-ICP-MS) of 701 ± 10 Ma giving the approximate minimum age of the São Gabriel accretionary event. The Encantadas block further east, containing the supracrustal Porongos belt and the Pelotas batholith, is in contrast characterized by reworking of Neoarchean to Palaeoproterozoic crust. The 789 ± 7 Ma zircon age of a metarhyolite intercalated with the metasedimentary succession of the Porongos belt provides a time marker for the basin formation. Zircons of a sample from tonalitic gneisses, constituting the Palaeoproterozoic basement of the Porongos belt, form a cluster at 2,234 ± 28 Ma, interpreted as the tonalite crystallization age. Zircon rims show ages of 2,100-2,000 Ma interpreted as related to a Palaeoproterozoic metamorphic event. The Porongos basin formed on thinned continental crust in an extensional or transtensional regime between c. 800-700 Ma. The absence of input from Neoproterozoic juvenile sources into the Porongos basin strongly indicates that the Encantadas and São Gabriel blocks were separated terranes that became juxtaposed next to each other during the Brasiliano accretional events. The tectonic evolution comprises two episodes of magmatic arc accretion to the eastern margin of the Rio de la Plata craton, (i) accretion of an intra-oceanic arc at c. 880 Ma (Passinho event) and (ii) accretion of the 760-700 Ma Cambaí/Vila Nova magmatic arc (São Gabriel event). The latter event also includes the collision of the Encantadas block with the Rio de la Plata craton to the west. Collision and crustal thickening was followed by sinistral shear along SW-NE-trending orogenparallel crustal-scale shear zones that can be traced from southern Brazil to Uruguay and have been active between 660 and 590 Ma. Voluminous granitic magmatism in the Pelotas batholith spatially related to shear zones is interpreted as late-to post-orogenic magmatism, possibly assisted by lithospheric delamination. It marks the transition to the post-orogenic molasse stage. Localized deformation by reactivation of preexisting shear zones continued Electronic supplementary material The online version of this article (

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“…Syn-to post-kinematic S-type granites, with ages in the range 580-550 Ma, are frequent in the Coastal Terrane and the westernmost Orogen Core (Seth et al 1998;Franz et al 1999;Kröner et al 2004;Goscombe et al 2005). The age of this magmatism corresponds to the post-collisional transpressional stage (580-550 Ma; Goscombe and Gray 2008;Konopásek et al 2008).…”

Section: The Shear Zones Of the Kaoko Beltmentioning

confidence: 99%

The transpressional connection between Dom Feliciano and Kaoko Belts at 580–550 Ma

Oyhantçabal

Siegesmund

Wemmer

et al. 2010

Int J Earth Sci (Geol Rundsch)

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A new U-Pb SHRIMP age of 551 ± 4 Ma on a mylonitic porphyry that intruded into the Sierra Ballena Shear Zone (Southernmost Dom Feliciano Belt, Uruguay) and a review of relevant published data make possible a more refined correlation and reconstruction of Brasiliano/ Pan-African transpressional events. Paleogeographic reconstruction, kinematics and timing of events indicate a connection between the shear systems of the Dom Feliciano and Kaoko Belts at 580-550 Ma. Sinistral transpression recorded in shear zones accommodates deformation subsequent to collision between the Congo and Río de la Plata Cratons. The correlation is strengthened by the similarity of magmatic and metamorphic ages in the Coastal Terrane of the Kaoko Belt and the Punta del Este Terrane of the Dom Feliciano Belt. This post-collisional sinistral transpression brought these units near to their final position in Gondwana and explains the different evolution at 550-530 Ma. While in the Kaoko Belt, an extensional episode resulted in exhumation as a consequence of collision in the Damara Belt, in the Dom Feliciano Belt, sinistral transpression occurred associated with the closure of the southern Adamastor Ocean due to Kalahari-Río de la Plata collision.

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U-Pb and Pb-Pb zircon ages for metamorphic rocks in the Kaoko Belt of Northwestern Namibia: A Palaeo- to Mesoproterozoic basement reworked during the Pan-African orogeny

Cited by 78 publications

References 49 publications

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

Multiple accretion at the eastern margin of the Rio de la Plata craton: the prolonged Brasiliano orogeny in southernmost Brazil

The transpressional connection between Dom Feliciano and Kaoko Belts at 580–550 Ma

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