Geochemistry and isotopic ratios of Neogene basalts from Spitzbergen Island, Svalbard archipelago, supplement to: Sushchevskaya, Nadezhda M; Korago, E A; Belyatsky, Boris V; Sirotkin, A N (2009): Geochemistry of Neogene magmatism at Spitsbergen Island. Geochemistry International, 47(10), 966-978


Petrological and geochemical data obtained on Neogene magmatism restricted to a deep fault in Andree Land at Spitsbergen Island, which was related to the overall restyling of the Arctic territory at 25-20 Ma, indicate that the derivation of the Neogene magmas was significantly affected by the continental pyroxenite mantle. The Neogene basalts are noted for a radiogenic isotopic composition of Pb (207Pb/204Pb= 15.5-15.55, 206Pb/204Pb = 18.4-18.6, 208Pb/204Pb = 38.4-38.6) and Sr (87Sr/86Sr = 0.7038-0.7048) at low 143Nd/144Nd = 0.5129. Melts of this type are the extremely enriched end member of the isotopic mixing of a depleted and enriched sources and determine a geochemical trend that passes through the compositions of alkaline magmas from Quaternary volcanoes at Spitsbergen and weakly enriched tholeiites of the Knipovich Ridge, which started to develop simultaneously with the onset of Neogene magmatism in the western part of Spitsbergen. The composition of the liquidus olivine (which is rich in NiO) indicates that melting occurred in the olivine-free mantle. Our data thus testify that a significant role in the genesis of the Neogene magmas was played by continental pyroxenite mantle.

Metadata Access
Creator Belyatsky, Boris V;Korago, E A;Sirotkin, A N;Sushchevskaya, Nadezhda M
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2009
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (79N-79N,14E-15E)
Temporal Point 2003-01-01T11:59:59Z