Volcanisme de l'île aux Pingouins, archipel Crozet, témoin de l'hétérogénéité du manteau fertile au sud de l'océan Indien

Translated title of the contribution: Penguins Island, Crozet archipelago, volcanic evidence for a heterogeneous mantle in the southern Indian Ocean

André Giret, Sylvie Tourpin, Sabine Marc, Olivier Verdier, Jean Yves Cottin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Despite its small area (5.6 km2), the Penguins Island brings magmatic information concerning mantle geochemical heterogeneities in southwestern Indian Ocean. The volcanism that built the island was firstly associated with marine deposits, and secondly with aerial, giving then abundant volcanic breccias and lava flows. The rocks are weakly differentiated and result of magmatic fractionation from picritic to tephritic types. K-Ar ages are near 1.1 Ma. The magmatic source may be related to a HIMU reservoir or to EMI ± EMII ones, depending on the geochemical evidences that are taken into account. However, comparisons with the Marion Island, on the same oceanic plateau and far to the west, as well as with Kerguelen Islands, far to the east, suggest a very heterogeneous mantle source.

Original languageFrench
Pages (from-to)481-488
Number of pages8
JournalComptes Rendus Geoscience
Volume334
Issue number7
DOIs
Publication statusPublished - 2002
Externally publishedYes

Keywords

  • Crozet
  • Hot spot
  • Indian Ocean
  • Mantle
  • Volcanism

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