Southeast Baffin volcanic margin and the North American‐Greenland plate separation

Geoffroy, Laurent; Callot, Jean‐Paul; Scaillet, Stéphane; Skuce, Andy; Gélard, Jean-Pierre; Ravilly, M.; Angelier, Jacques; Bonin, Bernard; Cayet, C.; Perrot, K.; Lepvrier, Claude

doi:10.1029/2001tc900003

Cited by 63 publications

(54 citation statements)

References 58 publications

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“…Although we infer that the initiation of these crustal detachments was related to passive rifting, we note the similarities with the continentward-dipping detachments controlling the crustal-scale structure of the magmatic provinces in Greenland (e.g. Geoffroy et al, 2001). Furthermore, analogue modelling has indicated that asymmetric crustal extension is favoured when the main intrusive layer is located within the ductile lower crust , as is most likely the case in the Vøring area.…”

Section: Last Rifting Episode and Breakupmentioning

confidence: 89%

“…The seaward-dipping volcanic wedges exposed in West and East Greenland display significant syn-magmatic extension coeval with crustal flexuring (Nielsen, 1975;Myers, 1980;Karson and Brooks, 1999;Geoffroy et al, 1998aGeoffroy et al, , 1999Geoffroy et al, , 2001. The crustal extension is documented through observations of coast-parallel dyke swarms and continentwarddipping normal faults at all scales (Geoffroy, 2001).…”

Section: Onshore East Greenlandmentioning

confidence: 97%

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Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Mjelde

Raum

Murai

et al. 2007

Journal of Geodynamics

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Section: Last Rifting Episode and Breakupmentioning

confidence: 89%

Section: Onshore East Greenlandmentioning

confidence: 97%

Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Mjelde

Raum

Murai

et al. 2007

Journal of Geodynamics

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“…A second eruption onshore West Greenland, represented by dike and sill complexes on Nuussuaq and Disko, was dated as 54.8G0.4 and 53.6G0.3 Ma by Storey et al (1998). Geoffroy et al (2001) dated five basaltic dikes on the south coast of Svartenhuk Halvø as 54.6G0.6 Ma. These dates are concurrent with chron 24r when the plates changed direction and the Ungava Fault Zone was created.…”

Section: Implications Of the Plate Reconstructionsmentioning

confidence: 99%

Margin segmentation of Baffin Bay/Davis Strait, eastern Canada based on seismic reflection and potential field data

Skaarup

Jackson

Oakey

2006

Marine and Petroleum Geology

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“…The first one, around 61.0 Ma, amounting to some 2 Mkm 3 in total volume, developed in western Greenland, southeastern Greenland (and possibly between the two below the ice), and northwest Britain (e.g., [43,68,104,172,173]). The second one (even larger) corresponds to breakup at 56 Ma and is found in both eastern Greenland and the Faroes, along part of the then nascent North Atlantic margin, but also in Baffin Bay west of Greenland [57,113]. The former shares the characteristics of many other provinces in having recorded few reversals and being confined in time to a total duration of the order of 1-2 Ma (note however that the volume estimate is subject to the presence of flood basalts below the ice sheet connecting the eastern-and western-coast outcrops, which is debated; Laurent Geoffroy, pers.…”

Section: The Brito-arctic Provincementioning

confidence: 99%

On the ages of flood basalt events

Courtillot

Renne

2003

Comptes Rendus. Géoscience

744

400

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We review available data constraining the extent, volume, age and duration of all major Phanerozoic continental flood basalts (CFB or traps) and oceanic plateaus (OP), together forming the group of large igneous provinces (LIP), going from the smallest Columbia flood basalts at ∼16 Ma to the as yet ill-known remnants of a possible trap at ∼360 Ma in eastern Siberia. The 16 traps (CFB and OP) reviewed form a rather unimodal distribution with an initial modal volume of the order of 2.5 Mkm 3 . Most provinces agree with a rather simple first order model in which volcanism may have lasted of the order of 10 Ma, often resulting in continental break-up, but where most of the volume was erupted in about 1 Ma or sometimes less. This makes CFBs/OPs (LIPs) major geodynamic events, with fluxes exceeding the total output of present day hot spots and even possibly exceeding over short times the entire crustal production of mid-ocean ridges. The proposed correlation between trap ages and the ages of several geological events, including mass extinctions and oceanic anoxia, is found to have improved steadily as more data have become available, to the point that the list of trap ages may coincide with many major divisions in the geological time scale. The four largest mass extinctions in the last 260 Ma coincide to the best resolution available with four traps, making a causal connection between the two through some form of catastrophic climatic perturbations the most likely hypothesis. The time sequence of LIPs appears to have been random and there is no robust evidence for long time trends in the corresponding crustal production rate over the last 260 Ma.  2003 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS. All rights reserved. RésuméNous passons en revue l'ensemble des données qui permettent de contraindre l'étendue, le volume, l'âge et la durée de toutes les grandes provinces magmatiques basaltiques (en anglais LIP) d'âge Phanérozoïque, qu'il s'agisse des trapps ou plateaux basaltiques continentaux (en anglais CFB) ou des plateaux océaniques (OP), allant de la plus récente et plus petite (le plateau de Columbia âgé de ∼16 Ma) à l'une des plus anciennes, encore mal connue, située dans l'Est de la Sibérie et sans doute âgée de ∼360 Ma. Les 16 provinces passées en revue forment une distribution assez unimodale, avec des volumes initiaux de lave de l'ordre de 2,5 Mkm 3 . La plupart des provinces sont compatibles, au premier ordre, avec un modèle simple selon lequel le volcanisme a pu durer une dizaine de millions d'années et a en général conduit à une déchirure des continents et à l'ouverture d'un nouveau bassin océanique, mais où l'essentiel du volume des laves a été émis en environ 1 million d'années, parfois moins. Ceci fait des trapps (des LIP en général) des événements géodynamiques majeurs, avec des flux de matière ayant dépassé la production totale actuelle des points chauds et même, peut-être, pendant de brefs intervalles, la totalité de la production de croûte V.E. Courtillot, P.R. Renn...

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Southeast Baffin volcanic margin and the North American‐Greenland plate separation

Cited by 63 publications

References 58 publications

Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Continent–ocean-transitions: Review, and a new tectono-magmatic model of the Vøring Plateau, NE Atlantic

Margin segmentation of Baffin Bay/Davis Strait, eastern Canada based on seismic reflection and potential field data

On the ages of flood basalt events

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