Propagating rift model for the V‐shaped ridges south of Iceland

Hey, R. N.; Martínez, F.; Höskuldsson, Ármann; Benediktsdóttir, Ásdís

doi:10.1029/2009gc002865

Cited by 52 publications

(84 citation statements)

References 122 publications

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“…PeronPinvidic et al 2012;Gernigon et al 2015;Blischke et al 2016). The seafloor spreading history for the last 20 myr has been modelled in detail by using high-resolution magnetic data along the Reykjanes, Mohn's and Kolbeinsey ridges (Ehlers & Jokat 2009;Merkur'ev et al 2009;Hey et al 2010;Benediktsdóttir et al 2012;Merkouriev & DeMets 2014).…”

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confidence: 99%

Break-up and seafloor spreading domains in the NE Atlantic

Gaina

Nasuti

Kimbell

et al. 2017

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An updated magnetic anomaly grid of the NE Atlantic and an improved database of magnetic anomaly and fracture zone identifications allow the kinematic history of this region to be revisited. At break-up time, continental rupture occurred parallel to the Mesozoic rift axes in the south, but obliquely to the previous rifting trend in the north, probably due to the proximity of the Iceland plume at 57-54 Ma.The new oceanic lithosphere age grid is based on 30 isochrons (C) from C24n old (53.93 Ma) to C1n old (0.78 Ma), and documents ridge reorganizations in the SE Lofoten Basin, the Jan Mayen Fracture Zone region, in Iceland and offshore Faroe Islands. Updated continent -ocean boundaries, including the Jan Mayen microcontinent, and detailed kinematics of the EocenePresent Greenland-Eurasia relative motions are included in this model.Variations in the subduction regime in the NE Pacific could have caused the sudden northwards motion of Greenland and subsequent Eurekan deformation. These events caused seafloor spreading changes in the neighbouring Labrador Sea and a decrease in spreading rates in the NE Atlantic. Boundaries between major oceanic crustal domains were formed when the European Plate changed its absolute motion direction, probably caused by successive adjustments along its southern boundary.

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confidence: 99%

Break-up and seafloor spreading domains in the NE Atlantic

Gaina

Nasuti

Kimbell

et al. 2017

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“…Is the TR analogous to the "V-shaped ridges" (VSRs) identified (and variously explained) along the Reykjanes and Kolbeinsey ridges (Vogt, 1971;Ito, 2001;Jones et al, 2002;Jones, 2003;Hey et al, 2007), the oldest on Reykjanes Ridge flanks dating back to ca. 37 Ma?…”

Section: Treitel Ridge: Nature and Originmentioning

confidence: 99%

Treitel Ridge: A unique inside corner hogback on the west flank of extinct Aegir spreading ridge, Norway basin

Vogt

Jung

2009

Marine Geology

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“…Active rift propagation has also been proposed on the Reykjanes Ridge south of Iceland (Hey et al 2010), although the acute V-shaped bathymetry and gravity anomalies are more commonly explained with a magma pulse model (Ito 2001;Jones et al 2002;Rudge et al 2008). Brozena & White (1990) identify evidence that multiple ridge jumps and ridge propagation events have reconfigured the arrangement of ridge segments over time in the South Atlantic.…”

Section: Kinematics Of the Tammar Propagating Rift 1383mentioning

confidence: 99%

Crustal structure and kinematics of the TAMMAR propagating rift system on the Mid-Atlantic Ridge from seismic refraction and satellite altimetry gravity

Kahle¹,

Tilmann

Grevemeyer

2016

Geophys. J. Int.

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: Crustal structure and kinematics of the TAMMAR propagating rift system on the Mid-Atlantic Ridge from seismic refraction and satellite altimetry gravity. -Geophysical Journal International, 206, 2, pp. 1382-1397 S U M M A R YThe TAMMAR segment of the Mid-Atlantic Ridge forms a classic propagating system centred about two degrees south of the Kane Fracture Zone. The segment is propagating to the south at a rate of 14 mm yr −1 , 15 per cent faster than the half-spreading rate. Here, we use seismic refraction data across the propagating rift, sheared zone and failed rift to investigate the crustal structure of the system. Inversion of the seismic data agrees remarkably well with crustal thicknesses determined from gravity modelling. We show that the crust is thickened beneath the highly magmatic propagating rift, reaching a maximum thickness of almost 8 km along the seismic line and an inferred (from gravity) thickness of about 9 km at its centre. In contrast, the crust in the sheared zone is mostly 4.5-6.5 km thick, averaging over 1 km thinner than normal oceanic crust, and reaching a minimum thickness of only 3.5 km in its NW corner. Along the seismic line, it reaches a minimum thickness of under 5 km. The PmP reflection beneath the sheared zone and failed rift is very weak or absent, suggesting serpentinisation beneath the Moho, and thus effective transport of water through the sheared zone crust. We ascribe this increased porosity in the sheared zone to extensive fracturing and faulting during deformation. We show that a bookshelf-faulting kinematic model predicts significantly more crustal thinning than is observed, suggesting that an additional mechanism of deformation is required. We therefore propose that deformation is partitioned between bookshelf faulting and simple shear, with no more than 60 per cent taken up by bookshelf faulting.

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Propagating rift model for the V‐shaped ridges south of Iceland

Cited by 52 publications

References 122 publications

Break-up and seafloor spreading domains in the NE Atlantic

Break-up and seafloor spreading domains in the NE Atlantic

Treitel Ridge: A unique inside corner hogback on the west flank of extinct Aegir spreading ridge, Norway basin

Crustal structure and kinematics of the TAMMAR propagating rift system on the Mid-Atlantic Ridge from seismic refraction and satellite altimetry gravity

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