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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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The absence of thick sediments on the margins of Galicia, Portugal, and North Biscay allows the underlying rift structure to be clearly seen on seismic reflection profiles. The rifted structure consists of a series of tilted, deformed, and rotated fault blocks bounded by listric normal faults, evidently produced by extension and subsidence. Comparison of the volume of a horizontal slice of the margin (sectional area) before and after extension suggests that the formation of the margin (rifting stage) results from two main tectonic processes acting simultaneously: extension by stretching of the lithosphere, and thinning of the crust by deep thermal processes. Simple models of margin formation dealing only with stretching processes may thus neglect the effect on hea flow and subsidence of the deep thermal processes.
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