Age and Significance of Sequence Boundaries on Jurassic and Early Cretaceous Rifted Continental Margins

Hubbard, Richard J.

doi:10.1306/703c81c8-1707-11d7-8645000102c1865d

Cited by 22 publications

(2 citation statements)

References 60 publications

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“…Triassic and Early Jurassic deposits comprise important amounts of evaporites, which accumulated in grabens and half-grabens at depths ranging from 2 to 4.5 km and thicknesses from 200 to 1500 m (Rasmussen et al, 1998;Reis et al, 2017). With the onset of seafloor spreading, the LB became an aborted rift (Hubbard, 1988), and halokinesis played an important role in its evolution, with different sectors developing independently as fault-bounded or salt-wall bounded sub-basins (Alves et al, 2003;Montenat et al, 1988. The main faults through the sediment fill of the LB revealed by commercial seismic reflection data (Walker, 1982) are depicted in Figure 1a.…”

Section: Regional Tectonicsmentioning

confidence: 99%

Interseismic Strain Accumulation Near Lisbon (Portugal) From Space Geodesy

Fonseca

Palano

Falcão

et al. 2021

Geophysical Research Letters

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The Lisbon Metropolitan Area, Portugal, has been affected by several destructive earthquakes nucleating both along the offshore Africa‐Eurasia plate boundary and on onshore inherited intraplate faults. Using a dense GNSS dataset coupled with PSInSAR analysis, we provide new evidence of sinistral simple shear driven by a NNE‐SSW first‐order tectonic lineament. PSInSAR vertical velocities corroborate qualitatively the GNSS strain‐rate field, showing uplift/subsidence where the GNSS data indicate contraction/extension. We propose the presence of a small block to the W of Lisbon moving independently toward the SW with a relative velocity of 0.96 ± 0.20 mm/yr, whose boundaries are part of a complex and as yet poorly constrained strike‐slip fault system, possibly rooting at depth into a simpler basement fault. Comparison between geodetic and seismic moment‐rates indicates a high seismic coupling. We show that the contribution of intraplate faults to the seismic hazard in the LMA is more important than currently assumed.

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Section: Regional Tectonicsmentioning

confidence: 99%

Interseismic Strain Accumulation Near Lisbon (Portugal) From Space Geodesy

Fonseca

Palano

Falcão

et al. 2021

Geophysical Research Letters

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“…Additionally, this chronostratigraphical chart allowed for a regional stratigraphical correlation of the lithological units between onshore outcrops and exploration wells in the Esmeraldas and Tumaco areas (Figure 8). The sequences genetically correlated were grouped in megasequences in the sense of Hubbard [48], where a megasequence correlates with a plate reorganization phase and with a second order sea level fall.…”

Section: Introductionmentioning

confidence: 99%

Origin of a double forearc basin: The example of the Tumaco - Manglares basin, Northestern Southamerica

Ramos

2020

CT&F Cienc. Tecnol. Futuro

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The subsidence and uplift history of the forearc system of southwestern Colombia and northern Ecuador margin is complex and reveals several stages of deformation. The sequential stratigraphy of the forearc area shows the development of three megasequences (M1 to M3). The basal megasequence corresponds to the basement of the forearc, which was formed at the end of the Mesozoic and at the beginning of the Cenozoic and accreted against the Northwestern part of South America related to the accretion of the Late Cretaceous – Paleoceneoceanic plateau. This accretion occurred in a transpressional regime. The second megasequence is composed by deep water sediments, recording the transition between transpressional to compressional stages of the margin from the Late Eocene to the Middle Miocene. The third megasequence is characterized by shallow water sediments strongly constrained by the compressional stage of the margin and the uplift activity of the structural highs since the Late Miocene up to present. The structural geometry of the margin is characterized by basement thrusts that deformed the forearc crust. Westward, the forearc zone -according to the support of the overriding plate -is divided into mantle wedge and lower plate domains. The margin evolution suggests that the subducting plate geodynamical changes affect strongly the interplate coupling and mantle wedge and produce changes in the subsidence or uplift through the double forearc basin systems.

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Seismic hazard impact of the Lower Tagus Valley Fault Zone (SW Iberia)

Vilanova¹,

Fonseca²

2004

Journal of Seismology

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Age and Significance of Sequence Boundaries on Jurassic and Early Cretaceous Rifted Continental Margins

Cited by 22 publications

References 60 publications

Interseismic Strain Accumulation Near Lisbon (Portugal) From Space Geodesy

Interseismic Strain Accumulation Near Lisbon (Portugal) From Space Geodesy

Origin of a double forearc basin: The example of the Tumaco - Manglares basin, Northestern Southamerica

Seismic hazard impact of the Lower Tagus Valley Fault Zone (SW Iberia)

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