Relict 1.4 Ga oceanic crust in the Zambezi Valley, northern Zimbabwe: Evidence for Mesoproterozoic supercontinental fragmentation

Oliver, Graham; Johnson, Simon P.; Williams, Ian S.; Herd, D. A.

doi:10.1130/0091-7613(1998)026<0571:rgocit>2.3.co;2

Cited by 47 publications

(25 citation statements)

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“…Separation between the Kalahari and Congo cratons during most of Neoproterozoic is indicated by Meso-to Neoproterozoic eclogites, arc volcanic rocks and ophiolites in the Zambezi Belt (Oliver et al 1998;Johnson & Oliver 2000John et al 2003), which characterize the presence of oceanic crust between them. The timing of the collision between Congo and Kalahari along the Irumide/Zambezi/Damara orogenic system is constrained by the age of the high-pressure metamorphism at 560-505 Ma (Vinyu et al 1999;Jung et al 2000;Hargrove et al 2003;John et al 2003;Goscombe et al 2004;Johnson & Oliver 2004).…”

Section: Assembly Of Gondwanamentioning

confidence: 99%

Late Neoproterozoic and Early Cambrian palaeogeography: models and problems

et al. 2008

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We present two alternative sets of global palaeogeographical reconstructions for the time interval 615-530 Ma using competing high and low-latitude palaeomagnetic data subsets for Laurentia in conjunction with geological data. Both models demonstrate a genetic relationship between the collisional events associated with the assembly of Gondwana and the extensional events related to the opening of the Tornquist Sea, the eastern Iapetus Ocean (600-550 Ma), and the western Iapetus Ocean (after 550 Ma), forming a three-arm rift between Laurentia, Baltica, and Gondwana. The extensional events are probably plume-related, which is indicated in the reconstructions by voluminous mafic magmatism along the margins of palaeo-continents. The low-latitude model requires a single plume event, whereas the high-latitude model needs at least three discrete plumes. Coeval collisions of large continental masses during the assembly of Gondwana, as well as slab pull from subduction zones associated with those collisions, could have caused upper plate extension resulting in the rifted arm that developed into the eastern Iapetus Ocean and Tornquist Sea but retarded development of the western Iapetus Ocean. As a result, the eastern Iapetus Ocean and the Tornquist Sea opened before the western Iapetus Ocean.

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Section: Assembly Of Gondwanamentioning

confidence: 99%

Late Neoproterozoic and Early Cambrian palaeogeography: models and problems

et al. 2008

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“…These include ophiolitic rocks (in the Chewore Inliers) dated at ca. 1393 Ma (Oliver et al, 1998) and orthogneisses dated at ca. 1080 Ma (Goscombe et al, 2000).…”

Section: The Northern Margin: Mesoproterozoic Remnantsmentioning

confidence: 99%

The Kalahari Craton during the assembly and dispersal of Rodinia

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Precambrian Research

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“…2) and dated at ca. 1393 Ma (Oliver et al, 1998). Geological investigations of the terranes that lie to the east, the Luangwa-Nyimba, Petauke-Sinda and Chipata terranes (Fig.…”

Section: The Southern Irumide Beltmentioning

confidence: 99%

“…In Zambia, this belt has been subdivided into several distinct lithotectonic terranes (Mapani et al, 2001;Johnson et al, 2006Johnson et al, , 2007b, some of which are bounded by discrete shear zones. The westernmost terrane, the Chewore-Rufunsa Terrane , is comprised of a wide variety of mafic to felsic gneisses and metavolcanic rocks that have calc-alkaline chemistries and trace element, Rare Earth Element (REE) and Nd-isotope signatures that are consistent with them having formed in a continental-margin-arc setting (Oliver et al, 1998;Oliver, 2000, 2004;Johnson et al, 2006Johnson et al, , 2007b. Magmatic activity in the arc is constrained between ca.…”

Section: The Southern Irumide Beltmentioning

confidence: 99%