Intraplate magmatism of the De Long Islands: A response to the propagation of the ultraslow-spreading Gakkel Ridge into the passive continental margin in the Laptev Sea

Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province

“…However, NbÁTa contents suggest more extensive crustal contamination of doleritic melts from Svalbard. Mafic intra-plate magmatism that may be correlated with the HALIP was also described from De Long Island (Silantyev et al 2004;Fedorov et al 2005). The rocks are alkali basalts, with KÁAr ages varying from 124 to 106 My.…”

“…Knowledge of the geology of these parts of the Amerasia Basin is very limited. The Alpha Ridge has been interpreted as a hot spot track, an oceanic plateau and a spreading centre (e.g., Jackson et al 1986;Maher 2001;Silantyev et al 2004) and was probably formed during or after the opening of the Canada Basin (Jokat 2003). According to Mukasa et al (2009), preliminary petrological data obtained from two dredged samples of low-alkaline basalt from the Alpha Ridge have intraplate characteristics and are geochemically similar to mafic rocks from Ellesmere Island and Greenland.…”

“…Buchan & Ernst (2006) and references therein. The compilation uses data from Tarakhovskiy et al (1982), Campsie et al (1988), Estrada et al (2006), Kontak et al (2001) and Silantyev et al (2004). The black triangles mark calculated peaks of magmatic activity.…”

Plume origin of the Central Arctic uplifts evolution in the Amerasian Basin of the Arctic Ocean

“…The studies included the Eastern part of Svalbard, King Charles Land, Franz Josef Land and De Longa islands, as well as the Northern part of Ellesmere and Axel Heiberg islands of the Canadian Arctic Archipelago. The basaltic magmatism was of the Late Jurassic to Late Cretaceous age, and sometimes up to Paleogene , Silantyev et al, 2004.…”

“…Based on bathymetrical data, the Lomonosov Ridge, Alpha Ridge, Mendeleev Rise, Chukchi Cap and Northwind Ridge were determined to form a single orographic area within the Amerasian Basin. Basins in this system are its components, which can be referred to subsidence basins formed as a result of crustal destruction [Gramberg and Naryshkin, 2000;Naryshkin, 1995]. Grachev [2001] concluded that the geomorphological manifestation is the most illustrative and simplest feature of mantle plume activity.…”