Magnetic evidence for slow seafloor spreading during the formation of the Newfoundland and Iberian margins

Srivastava, S. P.; Sibuet, Jean-Claude; Cande, S. C.; Roest, W. R.; Reid, I.

doi:10.1016/s0012-821x(00)00231-4

Cited by 218 publications

(387 citation statements)

References 41 publications

Supporting

Mentioning

371

Contrasting

Unclassified

Order By: Relevance

“…As the margin extended and thinned at an ultra-slow rate (< 10 mm/yr half spreading rate), it allowed time for the entire crust to cool conductively, resulting in the normally ductile midand lower-crust becoming progressively embrittled (Srivastava et al 2000;Pérez-Gussinyé and Reston 2001;Pérez-Gussinyé et al 2003). Once the crustal thicknesses reached < 10 km, the entire crust became brittle and coupled, a phenomenon known as continental hyperextension.…”

Section: Geologic Settingmentioning

confidence: 99%

Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion

Davy

Morgan

Minshull

et al. 2017

Geophysical Journal International

View full text Add to dashboard Cite

SummaryContinental hyperextension during magma-poor rifting at the Deep Galicia Margin is characterised by a complex pattern of faulting, thin continental fault blocks, and the serpentinisation, with local exhumation, of mantle peridotites along the S-reflector, interpreted as a detachment surface. In order to understand fully the evolution of these features, it is important to image seismically the structure and to model the velocity structure to the greatest resolution possible. Travel-time tomography models have revealed the longwavelength velocity structure of this hyperextended domain, but are often insufficient to match accurately the short-wavelength structure observed in reflection seismic imaging. Here we demonstrate the application of two-dimensional (2D) time-domain acoustic full-waveform inversion to deep water seismic data collected at the Deep Galicia Margin, in order to attain a

show abstract

Section: Geologic Settingmentioning

confidence: 99%

Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion

Davy

Morgan

Minshull

et al. 2017

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…The alternative scissor-type opening model (e.g. Srivastava et al, 2000;Rosenbaum et al, 2002;Sibuet et al, 2004) predicts about 600 km of Mesozoic extension and a similar value of shortening in the eastern portion of the Pyrenean orogen. These values are incompatible with the amount of shortening in that area, which ranges from 80 km (Teixell, 1998) to 120 km (Vergés et al, 1995), up to a maximum of about 160 km in the central portion of the Pyrenees (Muñoz, 1992;Beaumont et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Tavani

2012

Solid Earth

View full text Add to dashboard Cite

The Cantabrian domain represents the western portion of the Pyrenean orogen, in the area where the Iberian continental lithosphere was subducted toward the north underneath the transitional to oceanic lithosphere of the Bay of Biscay. There, the about 100 km of orogenic convergence have been mostly accommodated in the northern portion of the orogen (i.e. the retro wedge) developed in the Bay of Biscay abyssal plain, while only crustal-scale folding with limited internal deformation occurred in the Cantabrian southern wedge (pro-wedge). Integrated meso- and macrostructural analyses and a reappraisal of available information from the transitional area between the Pyrenean and Cantabrian domains are presented in this work, allowing to set geometric and kinematic constraints on the entire Meso-Cenozoic history of the northern portion of the Iberian Plate, including subduction initiation and evolution in the western portion of the Pyrenean orogen. <br><br> The structural record of the Late Jurassic to Early Cretaceous deformation stage, which was associated with rifting and seafloor spreading in the Bay of Biscay, indicates a ridge perpendicular (NNE-SSW oriented) extension, with no evidence of relevant strike-slip components during rifting. A Cenozoic NNW-SSE oriented shortening stage followed, related to the limited (about 100 km) north-directed subduction of the Iberian continental lithosphere underneath the transitional to oceanic lithosphere of the Bay of Biscay. Subduction led to the formation of the poorly-developed Cantabrian pro-wedge, which is laterally juxtaposed to the well-developed Pyrenean pro-wedge to the east. During this convergence stage, the structural framework in the Cantabrian pro-wedge, and particularly along its transition with the Pyrenean wedge to the east, was severely complicated by the reactivation of Paleozoic and Mesozoic inherited structures. <br><br> Data presented in this work fully support the development of the Cantabrian Mountains as related to indentation and consequent thickening of the Bay of Biscay transitional lower crust during north-directed subduction of Iberian continental lithosphere. In essence, the Cantabrian pro-wedge is a lithospheric south-verging fault-propagation anticline developing above the subduction plane. The structural record in the area indicates that a lithospheric fault-propagation folding stage was predated, during the very early stages of orogenic shortening, by the development of a lithospheric-scale open syncline overlying the nucleation point of lithosphere sinking. Such a syncline is today partially preserved and represents one of the few natural examples of subduction initiation

show abstract

“…Spreading axes of large oceanic basins generally end in transcurrent or subduction plate boundaries or in different types of triple junctions [5]. Yet there are few examples where spreading axes end in propagating rifts like the Gulf of Viscay [6][7][8], which is one of the better known inactive propagating rifts formed during the development of the northern Atlantic ocean; other examples are the opening of the Labrador Sea [9] or the back-arc basin related to the Tonga-Kermadec subduction [10]. In addition, there exist oceanic propagating rifts produced by a change in the spreading features, such as those described in the Galapagos area [11], the Mid-Atlantic ridge [12], the Selkirk palaeomicroplate in the South Pacific [13] or the Pacific-Antarctic ridge [14].…”

Section: Introductionmentioning

confidence: 99%

Propagating rift during the opening of a small oceanic basin: The Protector Basin (Scotia Arc, Antarctica)

Galindo-Zaldı́var

Bohoyo

Maldonado

et al. 2006

Earth and Planetary Science Letters

View full text Add to dashboard Cite

Magnetic evidence for slow seafloor spreading during the formation of the Newfoundland and Iberian margins

Cited by 218 publications

References 41 publications

Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion

Resolving the fine-scale velocity structure of continental hyperextension at the Deep Galicia Margin using full-waveform inversion

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Propagating rift during the opening of a small oceanic basin: The Protector Basin (Scotia Arc, Antarctica)

Contact Info

Product

Resources

About