The Tertiary picrites of West Greenland: contributions from ‘Icelandic’ and other sources

Holm, Paul Martin; Gill, R.C.O.; Pedersen, Asger Ken; Larsen, Jørgen Gutzon; Hald, Niels; Nielsen, Thorkild; Thirlwall, M. F.

doi:10.1016/0012-821x(93)90224-w

Cited by 79 publications

(40 citation statements)

References 34 publications

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“…The Early picrites of west Greenland are similar to sub-aerial Icelandic basalts and are formed by processes similar to melting of their source mantle (Holm et al, 1993). However, Gill et al (1995) suggest that the volcanic eruption of the West Greenland picrites occurred 5 to 6 Myrs earlier than the start of volcanism in East Greenland.…”

Section: Igneous Provinces and Influence Of The Plume In Easternmentioning

confidence: 99%

“…Several authors favoured a single plume hypothesis for the emplacement of all the volcanic provinces (Larsen et al, 1999;Nielsen et al, 2002;Storey et al, 1998;Torsvik et al, 2001). The geochemistry of early picrites of West Greenland are similar to subaerial Icelandic basalts and are formed by similar greater degrees of melting of their source mantle than their Icelandic counterparts (Holm et al, 1993). The volcanic eruption of the West Greenland picrites occurred ~5-6 Ma earlier than the start of volcanism in eastern Greenland (Gill et al, 1995).…”

Section: Magmatism and Influence Of The Mantle Plumementioning

confidence: 99%

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Tectonic variation and structural evolution of the West Greenland continental margin

Alsulami¹,

Paton²,

Cornwell³

2015

Bulletin

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Section: Igneous Provinces and Influence Of The Plume In Easternmentioning

confidence: 99%

Section: Magmatism and Influence Of The Mantle Plumementioning

confidence: 99%

Tectonic variation and structural evolution of the West Greenland continental margin

Alsulami¹,

Paton²,

Cornwell³

2015

Bulletin

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“…15 Vol.% in E Greenland, Nielsen et al, 1981) (Gill et al, 1992;Larsen et al, 1992;Holm et al, 1993). Definitions of picrites are not always unambiguous (Le Bas, 2000); Gill et al (1992) defined all basaltic rocks with MgO concentrations higher than 10 wt.% as picrites.…”

Section: West Greenland and Baffin Islandmentioning

confidence: 99%

“…The picrites on Baffin Island can be classified according to the Kent and Fitton (2000) classification scheme for the British Paleogene Igneous Province (BIP) into M2 magmas with slight light-REE enrichment ((La/Sm) N of 1-1.2; Robillard et al, 1992) and M3 magmas ((La/Sm) N of 0.6-0.7; Robillard et al, 1992) (Fig. 3b) Holm et al, 1993) similar to the present-day Atlantic MORB and/or Iceland basalts (Fig. 3a).…”

Section: West Greenland and Baffin Islandmentioning

confidence: 99%

The North Atlantic Igneous Province: A review of models for its formation

Meyer

Wijk²,

Gernigon³

2007

Special Paper 430: Plates, Plumes and Planetary Processes

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The mantle plume concept is currently being challenged as an explanation for North Atlantic Igneous Province formation. Alternative models have been suggested, including delamination, meteorite impact, small-scale rift-related convection, and chemical mantle heterogeneities. We review available datasets on uplift, strain localization, age and chemistry of igneous material, and tomography for the North Atlantic Igneous Province, and compare them with predictions from the mantle plume and alternative models. The mantle plume concept is quite successful in explaining formation of the NAIP, but unexplained aspects remain. Delamination and impact models are currently not supported. Rift-related small-scale convection models appear to be able to explain volcanic rifted margin volcanism well. However, the most important problem that non-plume models need to overcome is the continuing, long-lived melt anomaly extending via the Greenland-Faeroe Ridges to Iceland. Mantle heterogeneities, resulting from an ancient subducted slab, are included in plate tectonic models to explain the continuing melt production as an alternative to the mantle plume model, but there are still uncertainties related to this idea that need to be solved.

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“…Major-element whole-rock analyses of the two picritic basalt lavas are presented in Table 3, together with analyses of comparable lavas from the Svartenhuk Peninsula, west Greenland (Clarke, 1970; see also Holm et al, 1993), the Deccan Traps of India (Krishnamurthy and Cox, 1977), and proposed ultrabasic magma compositions from the BTVP. The Skye lavas were analysed for major-elements by XRFS using glass discs in the Department of Geology & Applied Geology, University of Glasgow.…”

Section: Whole-rock Compositionsmentioning

confidence: 99%

Picritic basalts from the Palaeocene lava field of west-central Skye, Scotland: evidence for parental magma compositions

Bell

Willamson

1994

Mineral. mag.

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Mineral chemistry and whole-rock compositional data are reported for two lavas of picritic basalt from the Palaeocene lava field of west-central Skye, Scotland. Whole-rock compositions for both flows plot on Thompson's (1982) 9 kbar cotectic for olivine + plagioclase + clinopyroxene + liquid. Both flows contain highly forsteritic olivine phenocrysts (c. Fo89), which enclose early-precipitated crystals of chrome-spinel (A1203: c. 25 wt.%; Cr203: c. 36 wt.%; FeO + Fe203: c. 20 wt.%; MgO: c. 15 wt.%). The olivine compositions indicate equilibrium with picritic basalt magma compositions, as represented by the whole-rock compositions of both lavas. A high-pressure origin for the chrome-spinels is suspected on the basis of their textural association and aluminous composition. Compositional comparisons between the whole-rock and mineral chemistry characteristics of both flows and a picritic basalt chill facies of the temporally-and spatially-associated Rum Igneous Complex suggests that similar parental magmas were involved.

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The Tertiary picrites of West Greenland: contributions from ‘Icelandic’ and other sources

Cited by 79 publications

References 34 publications

Tectonic variation and structural evolution of the West Greenland continental margin

Tectonic variation and structural evolution of the West Greenland continental margin

The North Atlantic Igneous Province: A review of models for its formation

Picritic basalts from the Palaeocene lava field of west-central Skye, Scotland: evidence for parental magma compositions

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