Utilize este identificador para referenciar este registo: http://hdl.handle.net/10284/200
Título: Superposed deformation straddling the continental-oceanic transition in deep-water Angola
Autor: Cramez, Carlos
Jackson, M.P.A.
Palavras-chave: Angola
Basin evolution
Congo Canyon
Fold-and-thrust belt
Gravity tectonics
Kwanza Basin
Lower Congo Basin
Raft tectonics
Salt tectonics
Data: 2000
Editora: Elsevier
Citação: Marine and Petroleum Geology, Vol. 17, nº10, pp. 1095-1109
Relatório da Série N.º: Marine and Petroleum Geology
Vol. 17, nº10
Resumo: The Angolan margin is the type area for raft tectonics. New seismic data reveal the contractional buffer for this thin-skinned extension. A 200-km-long composite section from the Lower Congo Basin and Kwanza Basin illustrates a complex history of superposed deformation caused by: (1) progradation of the margin; and (2) episodic Tertiary epeirogenic uplift. Late Cretaceous tectonics was driven by a gentle slope created by thermal subsidence; extensional rafting took place updip, contractional thrusting and buckling downdip; some distal folds were possibly unroofed to form massive salt walls. Oligocene deformation was triggered by gentle kinking of the Atlantic Hinge Zone as the shelf and coastal plain rose by 2 or 3 km; relative uplift stripped Paleogene cover off the shelf, provided space for Miocene progradation, and steepened the continental slope, triggering more extension and buckling. In the Neogene, a subsalt half graben was inverted or reactivated, creating keystone faults that may have controlled the Congo Canyon; a thrust duplex of seaward-displaced salt jacked up the former abyssal plain, creating a plateau of salt 3–4 km thick on the present lower slope. The Angola Escarpment may be the toe of the Angola thrust nappe, in which a largely Cretaceous roof of gently buckled strata, was transported seawards above the thickened salt by up to ,20 km. q 2001 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/10284/200
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