Structure and evolution of the Gulf of lions: The Sardinia seismic experiment and the G01D (Gulf of Lions Drilling) project

摘要

Major efforts have been made to explore the conjugate Gali-cian/Iberian and Newfoundland margins (legs 103, 149, 173, 210 and submitted ODP proposals 659, 692, and 740), which have improved our understanding of passive margin formation (e.g., the occurrence of limited magmatism despite the fact that extreme lithospheric thinning and exhumation of the mantle and lower continental crust occurred in the transition domain) as well as the asymmetry between the conjugate margins. Nevertheless, these discoveries mainly concern one end-member of conjugate passive margins system with strong continental lower crust (e.g., Huismans and Beaumont, 2011) and can hardly be applied to other margins. Furthermore, all propositions, all conceptual models must be placed on well-defined paleogeographic maps in order to test their consequences on global view to be validated. We need to avoid "conceptual kinematic models" presented on small map sketches as precise kinematic reconstruction can be only done with properly calculated Eulerian Poles (e.g., Aslanian and Moulin).