Skip to Main content Skip to Navigation
Journal articles

Flip-flop detachment tectonics at nascent passive margins in SE Afar

Abstract : We propose a two-stage tectonic evolution of SE Afar in Djibouti leading to the complex development of highly asymmetric conjugate margins. From c. 8.5 to c. 2 Ma, an early mafic crust developed, associated in the upper crust with synmagmatic growth faults dipping dominantly to the SW. After an erosional stage, a new detachment fault system developed from c. 2 Ma with an opposite sense of motion (i.e. to the NE), during an amagmatic extensional event. In the Asal area, break-up occurred after c. 0.8 Ma along the footwall of an active secondary detachment fault rooted at depth above the lithospheric necking zone. This evolution suggests that flip-flop detachment tectonics is developed during extension at passive margins, in connection with the dynamics of the melting mantle and the associated magma plumbing of the crust.
Complete list of metadatas

Cited literature [27 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01022271
Contributor : Adminhal Univbrestbu <>
Submitted on : Thursday, July 10, 2014 - 11:16:48 AM
Last modification on : Friday, June 12, 2020 - 3:38:03 PM
Long-term archiving on: : Friday, October 10, 2014 - 11:27:22 AM

File

J.Geol.SOC.Geoffroy_et_al._201...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Laurent Geoffroy, Bernard Le Gall, Mohammed Daoud, Mohamed Jalludin. Flip-flop detachment tectonics at nascent passive margins in SE Afar. Journal of the Geological Society of London, 2014, 171 (5), pp.689-694. ⟨10.1144/jgs2013-135⟩. ⟨insu-01022271⟩

Share

Metrics

Record views

338

Files downloads

495