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Title: The role of uplifts in the rifting and sedimentation history of the N. Atlantic
Author: McMahon, Neil Andrew
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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The synthesis and integration of existing biostratigraphic and sedimentological information from exploration wells in the circum-Atlantic region with recent developments in genetic sequence stratigraphic techniques and computer modelling has allowed the documentation of uplifts and the rifting history of the North Atlantic during the Late Jurassic and Early Cretaceous and has led to a better understanding of the history of N. Atlantic extension. Correlation of the Late Mesozoic stratigraphy between the Lusitanian, Celtic Sea Area, Wessex, Jeanne d'Arc, Faeroe/Shetland Basins and the Rockall Trough areas has resulted in the identification of the main unconformities/uplifts to have affected the N. Atlantic. This has permitted a new understanding for the evolution of the N. Atlantic and the mechanisms of rifting. Up to four major unconformities were identified along the Grand Banks/Iberian Margin during the Oxfordian to Valanginian period. The Late Kimmeridgian and Middle Berriasian unconformities caused the greatest amount of erosion and are associated with uplift events interpreted from vitrinite reflectance data, sedimentation and erosion patterns. These events are thought to be related to the sea floor spreading in the Tagus abyssal plain and the establishment of a new N. Atlantic rift axis in the Early Cretaceous. In the Celtic Sea Area and Wessex Basins a major intra-Cretaceous unconformity has been identified and it is interpreted to be associated with an uplift event which was heralded by a Late Jurassic regression and climaxed in the Berriasian. The uplift, interpreted from subsidence, AFTA and erosion data, was centred on the granites of the Cornubian Platform and peaked after the initiation of rifting in the Late Jurassic and before the emplacement of oceanic crust west of Goban Spur in the Aptian/Albian. The younger regional correlatable "Base Gault unconformity", to which the older event is normally linked, is related to crustal separation in the Bay of Biscay and can be dated as Early/Mid Albian.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available