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Mt Melbourne, Transantarctic Mtns, Victoria Land, Eastern Antarctica, Antarctica

Active stratovolcano (trachyandesite to trachyte) on the margin of the Ross Sea.
Present activity is fumarolic.
Trachyte from the northern side of Mt Melbourne is garnet-bearing.
Garnet is intergrown with groundmass feldspar, producing an oikocrystic texture.
The formation of garnet result from localized gas-streaming in
the lava, reacting Ca-rich residual melt according to the reaction: augite + magnetite + glass + O2 = andradite (above 700 °C).

Ref. Goldschmidt Conference Abstracts 2005
Environmental Geochemistry/Mineralogy
http://www.the-conference.com/2005/gold2005/web_pdfs/G07.pdf







Mineral List:
  • Andradite
  • Andradite
    var: Topazolite
  • Anorthoclase


    3 entries listed. 2 valid minerals.

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