期刊
MARINE GEOLOGY
卷 289, 期 1-4, 页码 135-149出版社
ELSEVIER
DOI: 10.1016/j.margeo.2011.09.014
关键词
SWIM wrench system; Gulf of Cadiz Accretionary Wedge (GCAW); thrust-wrench interference; analog modeling; Tethyan-related plate boundary
资金
- ALMOND [FTDC/CTE-GIN/71862/2006]
- EURO-MARGINS SWIM [REN2002-11234-EMAR, 01-LEC-EMA09F]
- NEAREST
- ESF [01-LEC-EMA09F]
- EU [037110]
- FCT [SFRH/BD/31188/2006, SFRH/BD/46227/2008]
- Landmark Graphics Corporation via Landmark University
- NASA WorldWind
- [TOPOEUROPE/0001/2007-TOPOMED]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/31188/2006, SFRH/BD/46227/2008, TOPOEUROPE/0001/2007] Funding Source: FCT
In the Gulf of Cadiz key segment of the Africa-Iberia plate boundary (North-East Atlantic ocean), three main different modes of tectonic interference between a recently identified wrench system (SWIM) and the Gulf of Cadiz Accretionary Wedge (GCAW) were tested through analog sand-box modeling: a) An active accretionary wedge on top of a pre-existent inactive basement fault; b) An active strike-slip fault cutting a previously formed, inactive, accretionary wedge; and c) Simultaneous activity of both the accretionary wedge and the strike-slip fault. The results we obtained and the comparison with the natural deformation pattern favor a tectonic evolution comprising two main steps: i) the formation of the Gulf of Cadiz Accretionary Wedge on top of inactive, Tethyan-related, basement faults (Middle Miocene to similar to 1.8 Ma); ii) subsequent reactivation of these basement faults with dextral strike-slip motion (similar to 1.8 Ma to present) simultaneously with continued tectonic accretion in the GCAW. These results exclude the possibility of ongoing active SWIM wrench system cross-cutting an inactive GCAW structure. Our results also support a new interpretation of the SWIM wrench system as fundamentally resulting from strike-slip reactivation of an old (Tethyan-related) plate boundary. (C) 2011 Elsevier B.V. All rights reserved.
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