40Ar–39Ar ages of intrusions in East Greenland: Rift-to-drift transition over the Iceland hotspot

Tegner, Christian; Brooks, C. Kent; Duncan, Robert A.; Heister, L. E.; Bernstein, Stefan

doi:10.1016/j.lithos.2007.09.001

Cited by 55 publications

(74 citation statements)

References 51 publications

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“…The Yelverton Bay area (close to the Alpha Ridge of the Amerasia Basin) shows some characteristic features, which are known from magma-rich rifted (volcanic) margins worldwide (e.g., Menzies et al, 2002) and from central East Greenland (e.g., Karson & Brooks, 1999;Tegner et al, 2008) Our interpretation of the Yelverton Bay area as a magmarich rifted margin coincides with the tectonic model from Funck et al (2011) in which the Alpha-Mendeleev Ridge was formed by seafloor-spreading parallel to the Canadian Polar margin (the Iceland model). A discussion about the involvement of a mantle plume that is postulated by Funck et al (2011) and many other authors is out of scope of this paper.…”

Section: North Greenlandmentioning

confidence: 99%

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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The poorly studied Alpha-Mendeleev Ridge of the Amerasia Basin of the Arctic Ocean is covered by a large magnetic high and interpreted to be part of the Cretaceous High Arctic Large Igneous Province (HALIP). At the north coast of Ellesmere Island, in the Yelverton Bay area, this characteristic magnetic high overlaps the shelf and the coastal area. Results of aeromagnetic surveys, geological fieldwork, geochronological, geochemical and Sr-Nd isotope analysis were combined to study the tectonic history of this part of the Canadian Polar margin. The basement, consisting of metamorphic rocks of the Pearya Terrane, was strongly affected by HALIP-related magmatism that is responsible for characteristic positive magnetic anomaly patterns. A broad magnetic high that can be traced to the Alpha Ridge covers the shelf and coastal areas of Yelverton Bay. It is caused by a voluminous intrusion into the continental crust at a depth of ca. 6-15 km. A chain of small positive magnetic anomalies crosses Wootton Peninsula from SW to NE and then curves into a NNE-SSW trend. It follows the coastline onshore and offshore and superimposes the southern and eastern margins of the broad magnetic high. On land, the anomaly chain covers fault-bounded outcrops of the Wootton Intrusive Complex (WIC) and the Hansen Point Volcanic Complex (HPVC), indicating that the entire anomaly chain is associated with a volcanogenic sequence. Rhyodacite that forms large parts of the HPVC east and west of Yelverton Bay extruded between c. 104 and 97 Ma (LA-ICP-MS U-Pb zircon ages). It originates from a tholeiitc suite and is probably genetically related to the deep intrusion. The HPVC together with the rhyodacite has an age range of c. 104-74 Ma and includes the mildly alkaline WIC (93-92 Ma). The northern coast of Ellesmere Island shows some characteristic features of a magma-rich rifted margin indicating an extensional evolution parallel to the North American margin between the openings of the Canada Basin and the Eurasian Basin.

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Section: North Greenlandmentioning

confidence: 99%

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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“…Cenozoic stratigraphy and nomenclature after Stoker et al (2005); Larsen et al (2005) and Eidvin et al (2007). Magmatic rocks ages after Storey et al (2007) and Tegner et al (2008). Onset of British Isles exhumation episodes after Holford et al (2009).…”

Section: Geodynamic Framework and Previous Interpretationmentioning

confidence: 99%

The Norway Basin revisited: From continental breakup to spreading ridge extinction

Gernigon

Gaina

Olesen

et al. 2012

Marine and Petroleum Geology

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“…Smaller-scale igneous activity preceded these main periods in, for example, the N Rockall Trough (Morton et al 1995;O'Connor et al 2000), continued subsequently in parts of the NAIP area for tens of millions of years (e.g. Tegner & Duncan, 1999;O'Connor et al 2000;Tegner et al 2008), and is continuing on Iceland and on the island of Jan Mayen (e.g. Trønnes et al 1999) (Table 1; Fig.…”

Section: B Igneous Settingsmentioning

confidence: 99%

“…Callot, Geoffroy & Brun, 2002). The locations of hypothetical triple junctions at the CE Greenland margin have been estimated from Early Palaeogene magmatism and uplifts in the area (Larsen & Watt, 1985;Nielsen, 1987;Mathiesen, Bidstrup & Christiansen, 2000;Callot, Geoffroy & Brun, 2002;Peate, Larsen & Lesher, 2003) and from triple junction localities as suggested by Burke & Dewey (1973); Karson & Brooks (1999) and Tegner et al (2008). This vast area was characterized by Early Palaeogene episodic igneous activity and frequent migration of magmatic centres (Larsen & Watt, 1985;Peate, Larsen & Lesher, 2003), and at least three separate rifting events have been recorded for this region, some of which occurred far inland (Nielsen, 1987;Olesen et al 2007).…”

Section: The Spatial Distribution Of Known and Inferred Magmatic Centmentioning

confidence: 99%

The onset of the North Atlantic Igneous Province in a rifting perspective

et al. 2009

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract -The processes that led to the onset and evolution of the North Atlantic Igneous Province (NAIP) have been a theme of debate in the past decades. A popular theory has been that the impingement on the lower lithosphere of a hot mantle plume (the 'Ancestral Iceland' plume) initiated the first voluminous outbursts of lava and initiated rifting in the North Atlantic area in Early Palaeogene times. Here we review previous studies in order to set the NAIP magmatism in a time-space context. We suggest that global plate reorganizations and lithospheric extension across old orogenic fronts and/or suture zones, aided by other processes in the mantle (e.g. local or regional scale upwellings prior to and during the final Early Eocene rifting), played a role in the generation of the igneous products recorded in the NAIP for this period. These events gave rise to the extensive Paleocene and Eocene igneous rocks in W Greenland, NW Britain and at the conjugate E Greenland-NW European margins. Many of the relatively large magmatic centres of the NAIP were associated with transient and geographically confined doming in Early Paleocene times prior to the final break-up of the North Atlantic area.

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40Ar–39Ar ages of intrusions in East Greenland: Rift-to-drift transition over the Iceland hotspot

Cited by 55 publications

References 51 publications

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

The Norway Basin revisited: From continental breakup to spreading ridge extinction

The onset of the North Atlantic Igneous Province in a rifting perspective

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