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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A110 (1982)

First Page: 703

Last Page: 715

Book Title: M 34: Studies in Continental Margin Geology

Article/Chapter: Extension Ratio Measurements on the Galicia, Portugal, and Northern Biscay Continental Margins: Implications for Evolutionary Models of Passive Continental Margins: Tectonic Processes: Model Investigations of Margin Environmental and Tectonic Processes

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Memoir

Pub. Year: 1982

Author(s): P. Chenet, L. Montadert, H. Gairaud, D. Roberts

Abstract:

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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