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Amsterdam Island, an isolated volcano in the southern Indian ocean

  • B. M. Gunn
  • C. E. Abranson
  • J. Nougier
  • N. D. Watkins
  • A. Hajash
Article

Abstract

Twelve lavas have been sampled on Amsterdam Island, which is an extinct shield volcano located on a transform fault crossing the south-eastern branch of the Indian Ocean rise. Chemical analyses show that the lavas have mainly tholeiitic affinities, ranging from olivine tholeiites to plagioclase basalts with accumulation of bytownite. The high alumina lavas are similar to bytownite cumulates dredged from the Indian Ocean rise, and the low alumina lavas resemble tholeiites of Hawaii. The volcano appears to be in an early stage of evolution from oceanic ridge basalt to an alkaline volcano.

Keywords

Alumina Chemical Analyse Olivine Indian Ocean Mineral Resource 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • B. M. Gunn
    • 1
  • C. E. Abranson
    • 1
  • J. Nougier
    • 2
  • N. D. Watkins
    • 3
  • A. Hajash
    • 4
  1. 1.Department of GeologyUniversité de MontréalMontrealCanada
  2. 2.Laboratoire de Géologie 1, Faculté des SciencesUniversité de ParisFrance
  3. 3.Graduate School of OceanographyUniversity of Rhode IslandKingstonUSA
  4. 4.Department of GeophysicsStanford UniversityStanfordUSA

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