Geological interpretation of combined SEABEAM, GLORIA and seismic data from Porto and Vigo Seamounts, Iberian continental margin

Mougenot, D.; Kidd, Robert B.; Mauffret, A.; Regnauld, Hervé; Rothwell, R. G.; Vanney, Jean-René

doi:10.1007/bf00286249

Cited by 30 publications

(18 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the study area, the continental shelf is limited by the 100 -120 m isobaths and does not exceed 60 km in width. The continental slope is gentle and sparsely punctuated by seamounts, which generally comprise nonvolcanic rift-related horsts uplifted during latest Cretaceous -Cenozoic inversion [Mougenot et al, 1984;Alves et al, 2003a]. Inversion structures are locally responsible for destabilization of the continental slope [Terrinha et al, 2003].…”

Section: Structure and Physiographymentioning

confidence: 99%

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

et al. 2009

View full text Add to dashboard Cite

Regional (2‐D) seismic reflection profiles, outcrop, and borehole data are used to characterize the evolution of deep offshore sedimentary basins in southwest Iberia (Alentejo Basin). The interpreted data indicate the bulk of Late Jurassic–earliest Cretaceous subsidence occurred in the present‐day continental slope area, as shown by (1) significant thickening of synrift strata basinward from a slope‐bounding fault system (SFS), west of which the total thickness of sediment can reach more than 9.0 km, and (2) relatively thin Mesozoic strata east of the SFS, where thickening of synrift units against principal faults is limited. Five principal regressive events and their basal unconformities reflect tectonic uplift and relative emersion in proximal basins, which were located on the rift shoulder to subsiding tilt blocks west of the SFS. These regressive events are correlated with major rift‐related events occurring on the deeper margin. Direct comparisons with the Peniche Basin of northwest Iberia reveal that significant portions of the Iberian lower plate margin were uplifted and eroded during the last stages of continental rifting. This process was repeated at different times (and in different areas) as the locus of rifting and continental breakup migrated northward. As a result, two distinct rift axes are recognized in west Iberia, a first axis extending from the Porto Basin to the Alentejo Basin and a second axis located on the outer proximal margin north of 38°30N. In addition, the SFS delimited (1) prograding deposits of Cretaceous‐Paleogene age and (2) late Cenozoic deposits draping the modern continental slope. These latter facts demonstrate that on lower plate passive margins, the relative position of the continental slope is established during the final rifting episode(s) preceding continental breakup.

show abstract

Section: Structure and Physiographymentioning

confidence: 99%

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The northwestern edge of the deep Galicia margin (together with Galicia Bank) was uplifted during Cenozoic tectonic events, and the sedimentary cover was partly washed out by subsequent submarine erosion (Boillot et al, 1979;Grimaud et al, 1982;Mougenot et al, 1984). New seismic reflection data were obtained during a 1990 Lusigal cruise to map the S reflector and surrounding terranes northward, from the region where the S reflector is deeply buried, to the uplifted area where the sediment thins.…”

Section: Leg 149 Scientific Prospectusmentioning

confidence: 99%

Ocean-Continent Transition in the Iberia Abyssal Plain

Sawyer¹,

Whitmarsh²,

Fisher³

1992

ODP Scientific Prospectus

View full text Add to dashboard Cite

“…From Vanney et al (1979Vanney et al ( ). thois et al, 1965Laughton et al, 1975;Vanney et al, 1979;Roberts and Kidd, 1984;Mougenot et al, 1984Mougenot et al, , 1986Lallemandet al, 1985).…”

Section: Bathymetry and Morphologymentioning

confidence: 99%

“…Mauffret et al (1978) and Boillot et al (1979), on the other hand, argued that the relief results from Eocene tectonic movements. Actually, the plateaus are Mesozoic tilted blocks and grabens that were reactivated and uplifted by early Cenozoic Pyrenean tectonics, except Vigo Seamount, which is an uplifted inverted basin (Mougenot et al, 1984).…”

Section: Bathymetry and Morphologymentioning

confidence: 99%

“…At Site 398, the occurrence of calcareous sediments in the Maestrichtian suggests uplift of that area to a height above the CCD during the latest Cretaceous. Tectonism along the Pyrenean margin of Iberia during Paleocene and Eocene times produced the numerous plateaus and seamounts on Galicia margin (Boillot et al, 1979;Mougenot et al, 1984). A less important tectonic event (reactivation of former faults) also occurred during the Miocene.…”

Section: Evolution and Structure Of The Margin As Visualized Before Lmentioning

confidence: 99%

See 1 more Smart Citation

Introduction, Objectives, and Principal Results: Ocean Drilling Program Leg 103, West Galicia Margin

Boillot¹,

Winterer²,

Meyer³

1987

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

Geological interpretation of combined SEABEAM, GLORIA and seismic data from Porto and Vigo Seamounts, Iberian continental margin

Cited by 30 publications

References 18 publications

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

Ocean-Continent Transition in the Iberia Abyssal Plain

Introduction, Objectives, and Principal Results: Ocean Drilling Program Leg 103, West Galicia Margin

Contact Info

Product

Resources

About