A gravity and magnetic anomaly study of the extinct Aegir Ridge, Norwegian Sea

Jung, Woo‐Yeol; Vogt, Peter R.

doi:10.1029/96jb03915

Cited by 31 publications

(63 citation statements)

References 67 publications

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“…Of key interest too is the time of abandonment of the Aegir Ridge and/or the time when spreading along the Kolbeinsey Ridge changed from a northward propagating pattern to 'orthogonal' opening described by the overall NE Atlantic pole of rotation. Unfortunately, the time of abandonment of the Aegir Ridge remains unclear since the anomaly of the central axis appears to be a fused mix of magnetic signatures post-dating Chron 13 (33 Ma) (Jung & Vogt 1997). The final phase of spreading along the Aegir Ridge was ultraslow, and the exact time of abandonment depends on how slow one allows the rate to become (e.g.…”

Section: Body Forcesmentioning

confidence: 99%

Potential mechanisms for the genesis of Cenozoic domal structures on the NE Atlantic margin: pros, cons and some new ideas

Doré¹,

Lundin

Kusznir

et al. 2008

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Section: Body Forcesmentioning

confidence: 99%

Potential mechanisms for the genesis of Cenozoic domal structures on the NE Atlantic margin: pros, cons and some new ideas

Doré¹,

Lundin

Kusznir

et al. 2008

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“…Such an evolution has been described north of Iceland, with a new spreading centre, the Kolbeinsey Ridge, rapidly growing at the expense of the Aegir Ridge, resulting in the abandonment of latter and the isolation of a small continental sliver, the Jan Mayen micro-continent (e.g. Jung and Vogt, 1997). The comparison is adequate, indeed, as both cases involve slow spreading centres in the vicinity of a major hotspot.…”

Section: Page 13 Of 32mentioning

confidence: 99%

Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

Yatheesh

Bhattacharya

Dyment

2009

Earth and Planetary Science Letters

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The Deccan Traps, one of the best known examples of rapid flood basalt, are considered as marking of the inception of a mantle plume on the Indian continental lithosphere. Their emplacement may be associated with the continental break-up of India and the Seychelles block and later formation of a new spreading centre, the Carlsberg Ridge, while spreading progressively ceased in the Mascarene Basin. Whether rifting, continental break-up, and seafloor spreading predated or were the consequence of the Deccan Traps emplacement is still a matter of debate. This issue is further complicated by the presence of a continental sliver, the Laxmi Ridge, and large basins lying landward of the Laxmi Ridge, such as the Laxmi and Gop basins, where nature of the crust is still ambiguous. The present study attempts to decipher the tectonic setting and the imprints of plume-ridge interaction in the Gop Basin, where the crust has been interpreted as either volcanics-intruded thinned continental crust or oceanic crust formed by a now extinct spreading centre. Based on interpretation of an updated compilation of marine geophysical data, the present study supports the oceanic nature of the crust underlying the Gop Basin and proposes the Palitana Ridge as the extinct spreading centre in this region. The prominent but short sequence of fairly linear magnetic anomalies in the Gop Basin does not allow a unique identification; it can be reasonably explained either as A31r-A25r (~69.3 -56.4 Ma) or as A29r-A25r (~64.8 -56.4 Ma) sequence. The variations of the spreading rates assumed by both these models suggest that spreading in the Gop Basin significantly slowed around 65 Ma, contemporaneous with the magmatic outburst of the Reunion plume on the adjacent western Indian mainland. Subsequently, the Gop Basin spreading centre was waning whereas a new spreading centre was developing further south, close to the (relatively) southward migrating plume. In this last stage, the Gop Basin spreading centre was associated with an abundant magmatism, probably supplied from the plume region.

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“…The initial opening occurred along the Aegir Ridge between the JMMC and the mid-Norwegian Møre Margin, and lasted until at least 30 Ma when the ridge became extinct (Jung & Vogt 1997;Gaina et al 2009;Gernigon et al 2015 and references therein). Gaina et al (2009) related the fragmented character of the JMMC to several failed ridge-propagation attempts of the Kolbeinsey Ridge.…”

Section: Geological Settingmentioning

confidence: 99%

A review of the NE Atlantic conjugate margins based on seismic refraction data

Funck

Gaina

Geissler

et al. 2016

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The NE Atlantic region evolved through several rift episodes, leading to break-up in the Eocene that was associated with voluminous magmatism along the conjugate margins of East Greenland and NW Europe. Existing seismic refraction data provide good constraints on the overall tectonic development of the margins, despite data gaps at the NE Greenland shear margin and the southern Jan Mayen microcontinent. The maximum thickness of the initial oceanic crust is 40 km at the Greenland-Iceland-Faroe Ridge, but decreases with increasing distance to the Iceland plume. High-velocity lower crust interpreted as magmatic underplating or sill intrusions is observed along most margins but disappears north of the East Greenland Ridge and the Lofoten margin, with the exception of the Vestbakken Volcanic Province at the SW Barents Sea margin. South of the narrow Lofoten margin, the European side is characterized by wide margins. The opposite trend is seen in Greenland, with a wide margin in the NE and narrow margins elsewhere. The thin crust beneath the basins is generally underlain by rocks with velocities of .7 km s 21 interpreted as serpentinized mantle in the Porcupine and southern Rockall basins; while off Norway, alternative interpretations such as eclogite bodies and underplating are also discussed.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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A gravity and magnetic anomaly study of the extinct Aegir Ridge, Norwegian Sea

Cited by 31 publications

References 67 publications

Potential mechanisms for the genesis of Cenozoic domal structures on the NE Atlantic margin: pros, cons and some new ideas

Potential mechanisms for the genesis of Cenozoic domal structures on the NE Atlantic margin: pros, cons and some new ideas

Early oceanic opening off Western India–Pakistan margin: The Gop Basin revisited

A review of the NE Atlantic conjugate margins based on seismic refraction data

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