Seismic profiles from Limpopo Magma-rich transform margin

Date 2020-09-28
Author(s) Roche VincentORCID1, Leroy SylvieORCID1, Guillocheau FrançoisORCID2, Revillon SidonieORCID3, Watremez LouiseORCID4, D'Acremont EliaORCID1, Nonn ChloéORCID1, Vetel William5, Despinois Frank5
Affiliation(s) 1 : Sorbonne Université, CNRS, Institut des Sciences de la Terre de Paris, ISTeP, Paris, France
2 : Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes France
3 : SEDISOR/LGO UMR 6538, IUEM, Plouzané, France
4 : Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, Lille, France
5 : Total Exploration et Production, Pau, France
DOI 10.17882/76414
Publisher SEANOE
Keyword(s) Transform margin, seismic profiles
Abstract

The continental rifted margins of Mozambique provide an excellent example of continental passive margins with a significant structural variability associated to magmatism and inheritance. Despite accumulated knowledge in this area, the tectonic structure and nature of the crust from Mozambique margins, especially the Limpopo transform margin are still poorly known. Here, we use high-resolution seismic reflection dataset and wells from industry topropose a structural interpretation of this area and a new conceptual model of oblique/hyper oblique margin. Our results indicate first that the Limpopo transform margin limits a continental crust westward, with deep Karoo grabens, from an oceanic crust domain eastward. Such fault controlled volcano-sedimentary basins result from two main tectonic events: a first E-W extension trend during the Permo-Trias (T1) followed by an NNW-SSE trending during the Jurassic (T2), oblique to the margin direction as attested by the presence of flower structures. The onset of oceanic spreading occurred then after ca. M25 (i.e. 156 Ma), triggering the uplift and erosion of the proximal parts of the margin as well as the formation of several other magmatic infilling (T3). This margin may be thus considered as magma-rich transform margin. Our new conceptual model from the onset of the rifted margin to the seafloor spreading shows a complex evolution where transtensional deformation contributes significantly to the distribution of magma generated. Such extensional pattern which is made of syn-transfer and - transform faults forming pull-apart structures becomes more important with time.

 

Licence CC-BY-NC-ND
Data
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150 MB PDF Access on demand until 2021-12-31
692 MB PDF Processed data Access on demand until 2021-12-31
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How to cite 

Roche Vincent, Leroy Sylvie, Guillocheau François, Revillon Sidonie, Watremez Louise, D'Acremont Elia, Nonn Chloé, Vetel William, Despinois Frank (2020). Seismic profiles from Limpopo Magma-rich transform margin. SEANOE. https://doi.org/10.17882/76414


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Roche V., Leroy S., Guillocheau, F., Revillon, S., Watremez L., d’Acremont, E., Nonn C., Vetel, W. , Despinois, F. (2020). The Limpopo magma-rich transform margin (South Mozambique) – Part 2: implications for the Gondwana breakup . Tectonics (submitted)