By Jean-Pierre Lefort
Major structural beneficial properties are utilized in this examine to reconstruct the hyperlinks which existed among North the USA, Europe and Africa earlier than the outlet of the North Atlantic Ocean. The synthesis of geophysical and geochemical info in addition to geological observations permits the popularity of the unique geometry of the Grenvillian, Cadomian, Caledonian, Ligerian-Acadian and Hercynian foldbelts and the id of historical plate sutures. The reader will discover a wealth of knowledge dependent not just at the English but additionally at the French and Spanish literature, hence establishing much less identified effects to the foreign community.
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Extra resources for Basement Correlation Across the North Atlantic
1973); it is perhaps the same basement whieh re-appears off Anglesey in N. , 1969). E. seaboard of Eire. This strueture represents a transitional zone with the European equivalent of the Gander Zone. Its faulted northern eontaet does not have the same struetural signifieanee as the Dover-Hermitage Fault in Newfoundland. From the magnetie point ofview, it is possible that the eore ofthis horst is made up ofOrdovieian igneous roeks (AI-Shaikh, 1970). 16. Sub-Pleistocene geology ofthe southern Irish Sea.
C LOWEA CAUST -=- ----- - ........ - , ~ . '0 0 ~ 25 km MOtST NOATHEAN SCOTLANO L" .. I ... ------- ,- -- . 'IM ............... • • ••• ~ . ,.. T I AJf ~_ _ ANO "LATID c'*' .. ~~ ... ----------- _ _ _ _ ~ c ..... IIII. --.. tC' ---..... 13. Seismic profiles ofthe submerged mobile belt. a Profile surveyed off Eastern Canada. (After Keen et al. 1986): b MOlST profile from Northern Scotland. (After Brewer and Smythe 1984). (After Hall etal. 03 km/so which foreshadows the obducted ophiolites observed in the Humber Zone on western Newfoundland.
This reinforces the observation already made about the Cadomian basement ridge in Portugal. The age of275 Ma obtained by K-Ar on red shales a bove the Acadian discordance on the Grand Banks indicates that there has been a late Hercynian overprint on Acadian metamorphism (Jansa and Wade, 1975). , 1980). In addition, a 272-Ma age is found for the Berlinguas Islands Granite (Portugal) (Fig. 33), which is situated opposite the Murre well site when allowance is made for opening of the North Atlantic.
Basement Correlation Across the North Atlantic by Jean-Pierre Lefort