The chemistry of Karoo-age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup

Grantham, G.H.; Eglington, B. M.; Macey, P.H.; Ingram, B. A.; Rademeyer, Mari; Kaiden, H.; Manhiça, V.

doi:10.25131/sajg.121.0026

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“…Conversely, the onset of rifting in the Mozambique Basin is characterized by a warmer thermal regime as attested by the presence of onshore Karoo magmatism (Rb/Sr age data at ca. 184 ± 15 Ma, Grantham et al, 2018), magmatic SDRs and the high velocity lower crustal body between the magnetic anomalies M38n and M33 (Mueller and Jokat, 2019) near the Angoche continental margin.…”

Section: Evolution Of the Dfzmentioning

confidence: 91%

The Davie Fracture Zone: A recorder of continents drifts and kinematic changes

Roche

Ringenbach

2022

Tectonophysics

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Section: Evolution Of the Dfzmentioning

confidence: 91%

The Davie Fracture Zone: A recorder of continents drifts and kinematic changes

Roche

Ringenbach

2022

Tectonophysics

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Sill complexes in the Karoo LIP: Emplacement controls and regional implications

Coetzee

Kisters

Chevallier

2019

Journal of African Earth Sciences

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The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup

Morake¹,

O'Kennedy²,

Knoper³

et al. 2021

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New 40Ar/39Ar data from dykes intruded into Sverdrupfjella and Ahlmanryggen, Dronning Maud Land, Antarctica, indicate that dyke emplacement commenced at ca. 207 Ma and lasted until ca. 178 Ma. Whereas the ages ascribed to the Karoo-age magmatism contributing to Gondwana breakup are typically inferred as being ca. 182 Ma, the data indicate that ages older than ca.192 Ma in the broader Karoo Province are restricted to western Dronning Maud Land, Antarctica, indicating the locality where break-up was initiated. Limited palaeomagnetic data from ca. 178-185 Ma dykes combined with published palaeomagnetic data from similar aged dykes in Vestfjella and the Ferrar Province, suggest that Antarctica had already drifted/rifted significantly away from southern Africa from ca. 207 Ma to ca. 180 Ma, earlier than previously thought. The data, if correct, require a re-evaluation of the ages ascribed to ocean-floor anomalies used to constrain reconstructions of Gondwana and may provide insight into the history of microcontinental blocks including the Falkland Islands, Haag nunataks, Ellsworth-Whitmore block and Maurice Ewing Bank.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5612838

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The chemistry of Karoo-age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup

Cited by 3 publications

References 41 publications

The Davie Fracture Zone: A recorder of continents drifts and kinematic changes

The Davie Fracture Zone: A recorder of continents drifts and kinematic changes

Sill complexes in the Karoo LIP: Emplacement controls and regional implications

The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup

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