A marine Late Jurassic syn-rift succession in the Lusitanian Basin, western Portugal — tectonic significance of stratigraphic signature
Identifieur interne : 000F57 ( Main/Exploration ); précédent : 000F56; suivant : 000F58A marine Late Jurassic syn-rift succession in the Lusitanian Basin, western Portugal — tectonic significance of stratigraphic signature
Auteurs : R. Ravn S [Norvège] ; J. Windelstad [Norvège] ; D. Mellere [Norvège] ; A. N Ttvedt [Norvège] ; T. Stuhr Sj Blom [Norvège] ; R. J. Steel [États-Unis] ; R. C. L. Wilson [Royaume-Uni]Source :
- Sedimentary Geology [ 0037-0738 ] ; 1997.
Abstract
In the Lusitanian Basin, which is located along the western Iberian margin, rapid subsidence in the Oxfordian-Tithonian resulted from extension related to the opening of the North Atlantic. In the Santa Cruz area, located in the western part of the Lusitanian Basin, the Kimmeridgian syn-rift, marine Abadia Formation and the overlying alluvial Kimmeridgian-Tithonian Praia da Amoreira member of the Lourinhã Formation, were deposited in the middle part of the hangingwall dip slope of a larger half-graben that constitutes the Turcifal subbasin. The marine part of the succession consists of base-of-slope and lower slope mudstones and sandy turbidites, middle slope mudstones, upper slope to shelfal/?shoreline mudstones and sandstones, and fan-deltaic deposits. Two intermediate-scale fining-to-coarsening (FUCU) units are present in the marine strata. The lower FUCU unit represents a normal, base-of-slope/lower slope to upper slope, shoaling-upward succession. The unit reflects the progradation of a hangingwall shelfal ramp and infilling of an inherited rift bathymetry during a period of relative tectonic quiescence. The upper FUCU unit represents an intermediate-scale deepening-shoaling-upward or backstepping-forestepping sequence which is related to a single rift event; the backstepping segment was deposited during a period of increasing basinal subsidence and basin floor tilt rates, the early syn-rotational stage. It consists of submarine channel-fill incised into slumped upper slope sediments, and adjacent overbank deposits. The backstepping segment terminates with a clay-prone marine interval with abundant soft-sediment deformation features, which represent a period of maximum sea-level stand during the rotational climax. The overlying forestepping segment consists of a shoaling-upward, slope to fan-deltaic succession which terminates with alluvial deposits. It represents an interval with decreasing basinal subsidence and basin floor tilt rates, and renewed overbalance of sediment supply, which led to a regression during the late syn-rotational stage. In medial reaches of the hangingwall dip slope, periods of increasing-to-decreasing rift activity are recorded by a backstepping-forestepping package, or a threefold sandstone-mudstone-sandstone lithosome motif. The formation of smaller-scale units superimposed on the intermediate-scale FUCU syn-rotational motif were controlled predominantly by minor fault-controlled subsidence events or higher-frequency faulting events.
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DOI: 10.1016/S0037-0738(97)00068-7
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Ravn S</name><affiliation></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>University of Bergen, Geological Institute, Allegaten 41, 5007 Bergen</wicri:regionArea><wicri:noRegion>5007 Bergen</wicri:noRegion></affiliation></author><author><name sortKey="Windelstad, J" sort="Windelstad, J" uniqKey="Windelstad J" first="J." last="Windelstad">J. Windelstad</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Statoil, LTEK, P.O. Box 300, 4001 Stavanger</wicri:regionArea><wicri:noRegion>4001 Stavanger</wicri:noRegion></affiliation></author><author><name sortKey="Mellere, D" sort="Mellere, D" uniqKey="Mellere D" first="D." last="Mellere">D. 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Wilson</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes</wicri:regionArea><wicri:noRegion>Milton Keynes</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Sedimentary Geology</title><title level="j" type="abbrev">SEDGEO</title><idno type="ISSN">0037-0738</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">114</biblScope><biblScope unit="issue">1–4</biblScope><biblScope unit="page" from="237">237</biblScope><biblScope unit="page" to="266">266</biblScope></imprint><idno type="ISSN">0037-0738</idno></series><idno type="istex">AC80CC3DDA05CA6A835C52432E3068163E2D37AB</idno><idno type="DOI">10.1016/S0037-0738(97)00068-7</idno><idno type="PII">S0037-0738(97)00068-7</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0037-0738</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In the Lusitanian Basin, which is located along the western Iberian margin, rapid subsidence in the Oxfordian-Tithonian resulted from extension related to the opening of the North Atlantic. In the Santa Cruz area, located in the western part of the Lusitanian Basin, the Kimmeridgian syn-rift, marine Abadia Formation and the overlying alluvial Kimmeridgian-Tithonian Praia da Amoreira member of the Lourinhã Formation, were deposited in the middle part of the hangingwall dip slope of a larger half-graben that constitutes the Turcifal subbasin. The marine part of the succession consists of base-of-slope and lower slope mudstones and sandy turbidites, middle slope mudstones, upper slope to shelfal/?shoreline mudstones and sandstones, and fan-deltaic deposits. Two intermediate-scale fining-to-coarsening (FUCU) units are present in the marine strata. The lower FUCU unit represents a normal, base-of-slope/lower slope to upper slope, shoaling-upward succession. The unit reflects the progradation of a hangingwall shelfal ramp and infilling of an inherited rift bathymetry during a period of relative tectonic quiescence. The upper FUCU unit represents an intermediate-scale deepening-shoaling-upward or backstepping-forestepping sequence which is related to a single rift event; the backstepping segment was deposited during a period of increasing basinal subsidence and basin floor tilt rates, the early syn-rotational stage. It consists of submarine channel-fill incised into slumped upper slope sediments, and adjacent overbank deposits. The backstepping segment terminates with a clay-prone marine interval with abundant soft-sediment deformation features, which represent a period of maximum sea-level stand during the rotational climax. The overlying forestepping segment consists of a shoaling-upward, slope to fan-deltaic succession which terminates with alluvial deposits. It represents an interval with decreasing basinal subsidence and basin floor tilt rates, and renewed overbalance of sediment supply, which led to a regression during the late syn-rotational stage. In medial reaches of the hangingwall dip slope, periods of increasing-to-decreasing rift activity are recorded by a backstepping-forestepping package, or a threefold sandstone-mudstone-sandstone lithosome motif. The formation of smaller-scale units superimposed on the intermediate-scale FUCU syn-rotational motif were controlled predominantly by minor fault-controlled subsidence events or higher-frequency faulting events.</div></front></TEI><affiliations><list><country><li>Norvège</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Trøndelag</li><li>Wyoming</li></region><settlement><li>Trondheim</li></settlement></list><tree><country name="Norvège"><noRegion><name sortKey="Ravn S, R" sort="Ravn S, R" uniqKey="Ravn S R" first="R." last="Ravn S">R. Ravn S</name></noRegion><name sortKey="Mellere, D" sort="Mellere, D" uniqKey="Mellere D" first="D." last="Mellere">D. Mellere</name><name sortKey="N Ttvedt, A" sort="N Ttvedt, A" uniqKey="N Ttvedt A" first="A." last="N Ttvedt">A. N Ttvedt</name><name sortKey="Stuhr Sj Blom, T" sort="Stuhr Sj Blom, T" uniqKey="Stuhr Sj Blom T" first="T." last="Stuhr Sj Blom">T. Stuhr Sj Blom</name><name sortKey="Windelstad, J" sort="Windelstad, J" uniqKey="Windelstad J" first="J." last="Windelstad">J. Windelstad</name></country><country name="États-Unis"><region name="Wyoming"><name sortKey="Steel, R J" sort="Steel, R J" uniqKey="Steel R" first="R. J." last="Steel">R. J. Steel</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Wilson, R C L" sort="Wilson, R C L" uniqKey="Wilson R" first="R. C. L." last="Wilson">R. C. L. Wilson</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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