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Steeply dipping reflectors within the crust can be interpreted in all places as inclined and probably ductile shear zones relating to either extension or compression. With respect to their location, a good candidate for such a feature is to relate them as ghosts thrust planes inherited from Caledonian or Hercynian orogenies. These pre-existing zones of weakness induce heterogeneity in the upper crust, which controls the asymmetry of future extensional tectonics. During an extensional regime, the top of the lower crust acts as a mechanical decoupling boundary separating asymmetrical brittle failure within the upper crust and symmetrical ductile creep within the lower crust.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Deep seismic profiling and sedimentary basins","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1989,"MonPub":null,"DateUpdate":"2016-02-15","DateCreate":"2005-11-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1989AG28300007","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":77572,"PubliDate":1989,"Pagination":"749-766","XtraPublOfAnaID":null,"ISBN":null,"Volume":"5","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42477,"SerRR":"Bulletin de la Société Géologique de France. 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