Detailed magnetic measurements south of the Iceland-Faroe Ridge

Voppel, Dietrich; Srivastava, S. P.; Fleischer, Ulrich

doi:10.1007/bf02226995

Cited by 15 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3c). The ridge jump has left two sections of anomaly 24 on the eastern side of the basin south of the Faroe-lceland Ridge (Voppel et al 1979). The extinct ridge axis (dashed line on Fig.…”

Section: Reconstructionsmentioning

confidence: 96%

Ridge-plume interaction in the North Atlantic and its influence on continental breakup and seafloor spreading

Smallwood¹,

White

2002

108

View full text Add to dashboard Cite

Development of the rifted continental margins and subsequent seafloor spreading in the North Atlantic was dominated by interaction between the Iceland mantle plume and the continental and oceanic rifts. There is evidence that at the time of breakup a thin sheet of particularly hot asthenospheric mantle propagated beneath the lithosphere across a 2500 km diameter region. This event caused transient uplift, massive volcanism and intrusive magmatism, and a rapid transition from continental stretching to seafloor spreading. Subsequently, the initial plume instability developed to an axisymmetric shape, with the c. 100 km diameter central core of the Iceland plume generating 30-40 km thick crust along the Greenland-Iceland-Faroes Ridge. The surrounding 2000 km diameter region received the lateral outflow from the plume, causing regional elevation and the generation of thicker and shallower than normal oceanic crust. We document both long-term (10-20Ma) and short-term (3-5Ma) fluctuations in the temperature and/or flow rate of the mantle plume by their prominent effects on the oceanic crust formed south of Iceland. Lateral ridge jumps in the locus of rifting are frequent above the regions of hottest asthenospheric mantle, occurring in both the early history of seafloor spreading, when the mantle was particularly hot, and throughout the generation of the Greenland-lceland-Faroes Ridge.

show abstract

“…3c). The ridge jump has left two sections of anomaly 24 on the eastern side of the basin south of the Faroe-lceland Ridge (Voppel et al 1979). The extinct ridge axis (dashed line on Fig.…”

Section: Reconstructionsmentioning

confidence: 96%

Ridge-plume interaction in the North Atlantic and its influence on continental breakup and seafloor spreading

Smallwood¹,

White

2002

108

View full text Add to dashboard Cite

show abstract

“…Historically, motion in the GIFR region was postulated to have been taken up on a classic ~150-kmlong sinistral transform fault named the Faroe Transform Fault or the Iceland Faroe Fracture Zone [Bott, 1985;Voppel et al, 1979] and this idea was reiterated in subsequent work [e.g., Blischke et al, 2017;Guarnieri, 2015]. Locations proposed for this feature include the north edge of the Iceland shelf, central Iceland, and the South Iceland Seismic Zone [Bott, 1974].…”

Section: The Greenland-iceland-faroe Ridgementioning

confidence: 99%

The Iceland Microcontinent and a continental Greenland-Iceland-Faroe Ridge

Foulger

Doré

Emeleus

et al. 2020

Earth-Science Reviews

View full text Add to dashboard Cite

The breakup of Laurasia to form the Northeast Atlantic Realm disintegrated an inhomogeneous collage of cratons sutured by cross-cutting orogens. Volcanic rifted margins formed that are underlain by magma-inflated, extended continental crust. North of the Greenland-Iceland-Faroe Ridge a new rift-the Aegir Ridge-propagated south along the Caledonian suture. South of the Greenland-Iceland-Faroe Ridge the proto-Reykjanes Ridge propagated north through the North Atlantic Craton along an axis displaced ~150 km to the west of the rift to the north. Both propagators stalled where the confluence of the Nagssugtoqidian and Caledonian orogens formed an ~300-km-wide transverse barrier. Thereafter, the ~150 x 300-km block of continental crust between the rift tips-the Iceland Microcontinent-extended in a distributed, unstable manner along multiple axes of extension. These axes repeatedly migrated or jumped laterally with shearing occurring between them in diffuse transfer zones. This style of deformation continues to the present day in Iceland. It is the surface expression of underlying magma-assisted stretching of ductile continental crust that has flowed from the Iceland Microplate and flanking continental areas to form the lower crust of the Greenland-Iceland-Faroe Ridge. Icelandic-type crust which underlies the Greenland-Iceland-Faroe Ridge is thus not anomalously thick oceanic crust as is often assumed. Upper Icelandic-type crust comprises magma flows and dykes. Lower Icelandic-type crust comprises magma-inflated continental mid-and lower crust. Contemporary magma production in Iceland, equivalent to oceanic layers 2-3, corresponds to Icelandic-type upper crust plus intrusions in the lower crust, and has a total thickness of only 10-15 km. This is much less than the total maximum thickness of 42 km for Icelandic-type crust measured seismically in Iceland. The feasibility of the structure we propose is confirmed by numerical modeling that shows extension of the continental crust can continue for many tens of millions of years by lower-crustal ductile flow. A composition of Icelandic-type lower crust that is largely continental can account for multiple seismic observations along with gravity, bathymetric, topographic, petrological and geochemical data that are inconsistent with a gabbroic composition for Icelandic-type lower crust. It also offers a solution to difficulties in numerical models for melt-production by downward-revising the amount of melt needed. Unstable tectonics on the Greenland-Iceland-Faroe Ridge can account for long-term tectonic disequilibrium on the adjacent rifted margins, the southerly migrating rift propagators that build diachronous chevron ridges of thick crust about the Reykjanes Ridge, and the tectonic decoupling of the oceans to the north and south. A model of complex, discontinuous continental breakup influenced by crustal inhomogeneity that distributes continental material in growing oceans fits other regions including the Davis Strait, the South Atlantic and the West Indian Ocean.

show abstract

The Iceland Mantle Plume: Status of the Hypothesis After a Decade of New Work

Vogt

1983

Structure and Development of the Greenland-Scotland Ridge

View full text Add to dashboard Cite

Detailed magnetic measurements south of the Iceland-Faroe Ridge

Cited by 15 publications

References 25 publications

Ridge-plume interaction in the North Atlantic and its influence on continental breakup and seafloor spreading

Ridge-plume interaction in the North Atlantic and its influence on continental breakup and seafloor spreading

The Iceland Microcontinent and a continental Greenland-Iceland-Faroe Ridge

The Iceland Mantle Plume: Status of the Hypothesis After a Decade of New Work

Contact Info

Product

Resources

About