Spatial, temporal and geochemical characteristics of Silurian collision-zone magmatism: an example of a rapidly evolving magmatic system related to slab break-off | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Spatial, temporal and geochemical characteristics of Silurian collision-zone magmatism: an example of a rapidly evolving magmatic system related to slab break-off

Type de publication:

Journal Article

Source:

Lithos, Volume 89, Ticket 3-4, p.377-404 (2006)

ISBN:

0024-4937

Mots-clés:

Géosciences marines ; Post-collisional; Slab break-off; Granite; Alkaline; Newfoundland, UMR 7096

Résumé:

Silurian plutonic suites in the Newfoundland Appalachians include abundant gabbro, monzogabbro and granite to granodiorite and lesser quartz diorite and tonalite. Most are medium- to high-K, but included are some low-K and shoshonitic mafic compositions. Felsic rocks are of both alkaline (A-type or within-plate granite (WPG)) and calc-alkaline volcanic arc granite (VAG) affinity. Mafic rocks include both arc-like (Nb/Th < 3) calc-alkaline and non-arc-like (Nb/Th > 3) transitional calc-alkaline basalt to continental tholeiitic affinity compositions. εNd(T) values range from − 9.6 to + 5.4 and δ18O (VSMOW) values range from + 3.1 to + 13.2‰.