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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2017-80
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
14 Aug 2017
Review status
This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Solid Earth (SE).
Tie-points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa, and the Riiser-Larsen Sea, Antarctica
Jennifer Klimke1, Dieter Franke1, Estevão Stefane Mahanjane2, and German Leitchenkov3 1Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655 Hannover, Germany
2Institute National Petroleum (INP), Av. Fernão Maga lhaes N. 34, 2nd Floor, P.O. Box 4724, Maputo, Mozambique
3All-Russia Research Institute for Geology and Mineral Resources of the World Ocean, 1 Angliysky Ave, St. Petersburg 190121, Russia
Abstract. Movements within early Gondwana dispersal are poorly constrained and there is uncertainty about the position and structural style of the continent-ocean transition and the timing and directions of the rifting and earliest seafloor spreading phases. In this paper, we present a combined structural interpretation of multichannel reflection seismic profiles from offshore northern Mozambique (East Africa), and the conjugate Riiser Larsen Sea (Antarctica). We find similar structural styles at the margins of both basins. At certain positions at the foot of the continental slope, the basement is intensely deformed and fractured, a structural style very untypical for rifted continental margins. Sediments overlying the deformation zone are deformed and reveal toplap and onlap geometries, implying a post-breakup deformation phase. We propose this unique deformation zone as tie-point for Gondwana reconstructions. Accordingly, we interpret the western flank of Gunnerus Ridge, Antarctica as a transform margin, similar to Davie Ridge, East Africa, implying that they are conjugate features. We consider it likely that a first phase of rifting and early seafloor spreading in NE-SW direction was subsequently replaced by a N-S directed transform deformation phase, overprinting the continent-ocean transition. This change of the spreading directions from NW-SE to N-S is suggested to have occurred by the Late Middle Jurassic, around magnetic anomaly M38n.2n (~ 164 Ma). We suggest that the second phase of deformation corresponds to the strike-slip movement of Madagascar and Antarctica and discuss implications for Gondwana breakup.

Citation: Klimke, J., Franke, D., Mahanjane, E. S., and Leitchenkov, G.: Tie-points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa, and the Riiser-Larsen Sea, Antarctica, Solid Earth Discuss., https://doi.org/10.5194/se-2017-80, in review, 2017.
Jennifer Klimke et al.
Jennifer Klimke et al.
Jennifer Klimke et al.

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In this paper, we present a combined structural interpretation of multichannel reflection seismic profiles from offshore northern Mozambique (East Africa), and the conjugate Riiser Larsen Sea (Antarctica). At certain positions at the foot of the continental slope at both basins, the basement is intensely deformed and fractured. We propose this unique deformation zone as tie-point for Gondwana reconstructions.
In this paper, we present a combined structural interpretation of multichannel reflection...
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