Insights from the Jan Mayen system in the Norwegian-Greenland sea-I. Mapping of a microcontinent

Péron‐Pinvidic, Gwenn; Gernigon, Laurent; Gaina, Carmen; Ball, Philip

doi:10.1111/j.1365-246x.2012.05639.x

Cited by 51 publications

(52 citation statements)

References 115 publications

(209 reference statements)

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“…At that time, the Kolbeinsey Ridge started to develop from the south, with final detachment of the Jan Mayen microcontinent from East Greenland occurring at 20 Ma (Chron C6b) Peron-Pinvidic et al 2012). The thickness of the oceanic crust that was formed in the northern portions of the Aegir and Kolbeinsey ridges differs significantly (Fig.…”

Section: Thickness Of Oceanic Crustmentioning

confidence: 99%

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Funck

Geissler

Kimbell

et al. 2016

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Seismic refraction data and results from receiver functions were used to compile the depth to the basement and Moho in the NE Atlantic Ocean. For interpolation between the unevenly spaced data points, the kriging technique was used. Free-air gravity data were used as constraints in the kriging process for the basement. That way, structures with little or no seismic coverage are still presented on the basement map, in particular the basins off East Greenland. The rift basins off NW Europe are mapped as a continuous zone with basement depths of between 5 and 15 km. Maximum basement depths off NE Greenland are 8 km, but these are probably underestimated. Plate reconstructions for Chron C24 (c. 54 Ma) suggest that the poorly known Ammassalik Basin off SE Greenland may correlate with the northern termination of the Hatton Basin at the conjugate margin. The most prominent feature on the Moho map is the Greenland-Iceland-Faroe Ridge, with Moho depths .28 km. Crustal thickness is compiled from the Moho and basement depths. The oceanic crust displays an increased thickness close to the volcanic margins affected by the Iceland plume.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Section: Thickness Of Oceanic Crustmentioning

confidence: 99%

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Funck

Geissler

Kimbell

et al. 2016

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“…The north part of the Kolbeinsey ridge (NKR) has been investigated geochemically from dredged samples (red circles [ Haase et al , ], yellow circles [ Mertz et al , ], yellow triangles [ Elkins et al , ], and white triangles [ Campsie et al , ]). The white dashed line represents the location of the continental ocean boundary (COB) around the JMMC by Breivik et al [] incorporating results from Kandilarov et al [], while the red dashed line shows the COB by Peron‐Pinvidic et al [, ].…”

Section: Introductionmentioning

confidence: 99%

“…The JMMC separated from east Greenland at about 24 Ma [ Talwani and Eldholm , ; Vogt et al , ; Gaina et al , ] (Figure ). The continent‐ocean transition (COT) along the JMMC margins was constrained by Peron‐Pinvidic et al [, ] mainly based on seismic reflection data combined with magnetic and gravity data. Wide‐angle seismic data further constrains the northern boundary of the JMMC which coincides with the continuation of the northern lineament of the East Jan Mayen Fracture Zone (EJMFZ) [ Kandilarov et al , ].…”

Section: Introductionmentioning

confidence: 99%

Crustal structure and origin of the Eggvin Bank west of Jan Mayen, NE Atlantic

et al. 2017

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The Eggvin Bank, located between the Jan Mayen Island and Greenland, is an unusually shallow area containing several submarine volcanic peaks, confined by two transforms on the Northern Kolbeinsey Ridge (NKR). We represent P and S wave velocity models for the Eggvin Bank based on an Ocean Bottom Seismometer profile collected in 2011, showing igneous crustal thickness variations from 8 km to 13 km. A 2–5 km increase is associated with two separate 20–30 km wide segments under the main seamounts. The oceanic crust has three layers: upper crust (L2A: 2.8–4.8 km/s), middle crust (L2B: 5.5–6.5 km/s), and lower crust (L3: 6.7–7.35 km/s). Both the thick layer 2(A/B) and the high ratio of layer 2(A/B) thickness to total crustal thickness indicate that secondary, intraplate magmatism built the seamounts of the Eggvin Bank. The seamount in the north where the crust is thickest has a flat top indicating subaerial exposure but is deeper than those with rounded tops in the south and is therefore probably older. Comparing lower crustal seismic velocity with crustal thickness also indicates that the degree of mantle melting may be higher in the north than in the south. An enriched mantle source presently feeds the NKR magmatism and probably influenced the Eggvin Bank development also at earlier times. To what extent the Eggvin Bank has been influenced by the Iceland plume is uncertain, both an enriched mantle component and elevated mantle temperature may have played a role at different times and locations.

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“…During Paleocene rifting, the JMMC was still part of Greenland (Gaina et al 2009). Break-up in the Early Eocene occurred between the JMMC and the mid-Norway and Faroe margins along the Aegir Ridge, and is imaged by regional SDRs along the eastern margin of the JMMC (Peron-Pinvidic et al 2012). At 30 Ma, the Aegir Ridge became extinct and the separation of the JMMC from East Greenland was completed at 20 Ma (Gaina et al 2009) when a seafloor spreading system developed along the Kolbeinsey Ridge.…”

Section: Margins Of the Jan Mayen Microcontinentmentioning

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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Insights from the Jan Mayen system in the Norwegian-Greenland sea-I. Mapping of a microcontinent

Cited by 51 publications

References 115 publications

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Moho and basement depth in the NE Atlantic Ocean based on seismic refraction data and receiver functions

Crustal structure and origin of the Eggvin Bank west of Jan Mayen, NE Atlantic

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

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