Geochemistry International

, Volume 46, Issue 1, pp 1–16 | Cite as

Conditions of Quaternary magmatism at Spitsbergen Island

  • N. M. Sushchevskaya
  • A. N. Evdokimov
  • B. V. Belyatsky
  • V. A. Maslov
  • D. V. Kuz’min
Article

Abstract

Petrological and geochemical data obtained on the Quaternary lavas of volcanoes at Spitsbergen Island indicate that the rocks were produced via the deep-seated crystallization of parental alkaline magmas at 8–10 kbar. The character of clinopyroxene enrichment in incompatible elements indicates that the mineral crystallized from more enriched melts than those inferred from the composition of the host lavas. These melts were close to the parental melts previously found as veinlets in mantle hyperbasite xenoliths in the lavas. According to the character of their enrichment in Pb and Sr radiogenic isotopes and depletion in Nd, the basalts from Spitsbergen Island define a single trend with the weakly enriched tholeiites of the Knipovich Ridge, a fact suggesting the closeness of the enriched sources beneath the continental margin of Spitsbergen and beneath the spreading zone. Magmatic activity at Spitsbergen was related to the evolution of the Norwegian-Greenland basin, which evolved in pulses according to the shift of the spreading axes. The most significant of the latter events took place in the Neogene, when the Knipovich Ridge obtained its modern position near the western boundary of Spitsbergen. Early in the course of the evolution, the emplacement of alkaline melts generated at Spitsbergen into the oceanic mantle could form the enriched mantle, which was later involved in the melting process beneath the spreading zone.

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • N. M. Sushchevskaya
    • 1
  • A. N. Evdokimov
    • 2
  • B. V. Belyatsky
    • 2
  • V. A. Maslov
    • 2
  • D. V. Kuz’min
    • 3
    • 4
  1. 1.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia
  2. 2.All-Russia Research Institute of Geology and Mineral Resources of the World Ocean (VNII Okeanologiya)St. PetersburgRussia
  3. 3.Institute of Geology and Mineralogy, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  4. 4.Department of GeochemistryMax Plank Instut fuer ChemieMainzGermany

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