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Flemish Cap-Goban Spur conjugate margins: New evidence of asymmetry

Flemish Cap-Goban Spur conjugate margins: New evidence of asymmetry
Flemish Cap-Goban Spur conjugate margins: New evidence of asymmetry
We present the combined results of deep multichannel reflection and refraction seismic surveys across the Flemish Cap–Goban Spur conjugate margin pair (North Atlantic), which we use to infer rifting style and breakup. Profiles on both margins cross magnetic anomaly 34 and extend into oceanic crust, making it possible to observe the complete history from continental rifting through to the formation of initial oceanic crust. The deep multichannel seismic (MCS) reflection data have previously been used to support a model of symmetric pure shear extension followed by asymmetric breakup and a sharp continent-ocean boundary. Using both types of seismic data, our results indicate instead that asymmetric structures are formed during all stages of rifting, breakup, and complex transition to oceanic spreading. The differing nature of the two ocean-continent transition zones is particularly striking. For Flemish Cap, our reprocessed image of the MCS profile clearly shows tilted fault blocks beneath back-tilted sediment packages, consistent with a wide region of highly thinned continental crust inferred from wide-angle seismic data. In contrast, normal incidence and wide-angle seismic data for the Goban Spur transition zone indicate the presence of exhumed serpentinized mantle.
0091-7613
1107-1110
Gerlings, J.
8ca477bf-db72-4c71-992d-1e372a70ffcb
Louden, K.E.
ef845a02-d45f-4b37-b9ee-37a3e04390b2
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Nedimovic, M.R.
867075a2-41ed-4743-9aa7-148cbf2f97d2
Gerlings, J.
8ca477bf-db72-4c71-992d-1e372a70ffcb
Louden, K.E.
ef845a02-d45f-4b37-b9ee-37a3e04390b2
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Nedimovic, M.R.
867075a2-41ed-4743-9aa7-148cbf2f97d2

Gerlings, J., Louden, K.E., Minshull, T.A. and Nedimovic, M.R. (2012) Flemish Cap-Goban Spur conjugate margins: New evidence of asymmetry. Geology, 40 (12), 1107-1110. (doi:10.1130/G33263.1).

Record type: Article

Abstract

We present the combined results of deep multichannel reflection and refraction seismic surveys across the Flemish Cap–Goban Spur conjugate margin pair (North Atlantic), which we use to infer rifting style and breakup. Profiles on both margins cross magnetic anomaly 34 and extend into oceanic crust, making it possible to observe the complete history from continental rifting through to the formation of initial oceanic crust. The deep multichannel seismic (MCS) reflection data have previously been used to support a model of symmetric pure shear extension followed by asymmetric breakup and a sharp continent-ocean boundary. Using both types of seismic data, our results indicate instead that asymmetric structures are formed during all stages of rifting, breakup, and complex transition to oceanic spreading. The differing nature of the two ocean-continent transition zones is particularly striking. For Flemish Cap, our reprocessed image of the MCS profile clearly shows tilted fault blocks beneath back-tilted sediment packages, consistent with a wide region of highly thinned continental crust inferred from wide-angle seismic data. In contrast, normal incidence and wide-angle seismic data for the Goban Spur transition zone indicate the presence of exhumed serpentinized mantle.

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Published date: 2012
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 346400
URI: http://eprints.soton.ac.uk/id/eprint/346400
ISSN: 0091-7613
PURE UUID: 5409ab58-3c38-45d0-845c-84267e22d5e7
ORCID for T.A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 18 Dec 2012 16:59
Last modified: 15 Mar 2024 03:04

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Contributors

Author: J. Gerlings
Author: K.E. Louden
Author: T.A. Minshull ORCID iD
Author: M.R. Nedimovic

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