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

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Latitude & Longitude (WGS84): 74° 24' South , 164° 42' East
Latitude & Longitude (decimal): -74.4, 164.7
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).

Melbourne volcanic province stretches across the Transantarctic Mountains in northern Victoria Land and ranges in age from 0 to 7 m.y. A Central Suite of intermediate and trachytic lavas form stratovolcanoes, cones and plugs, while many small basanite outcrops constitute a Local Suite. Three lava lineages, resulting from differentiation, are recognised. 1) Lavas at The Pleiades and Mt Overlord consist of a mildly potassic trachyandesite-tristanite-K-trachyte-peralkaline K-trachyte lineage. Major, trace and rare earth element (REE) data suggest evolution by fractional crystallization of olivine, clinopyroxene, magnetite, apatite and feldspar. 2) A basanite-nepheline hawaiite-nepheline mugearite-nepheline benmoreite lineage, found at The Pleiades is believed to result from fractional crystallization of olivine, clinopyroxene, kaersutite, magnetite, apatite and feldspar. 3) An oversaturated (Q = 0 to 18%) strongly potassic quartz trachyandesite-quartz tristanite-quartz trachyte lineage occurs at only Mt Melbourne.

Mineral List

8 entries listed. 5 valid minerals.

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Geological Society, London, Special Publications 2008, v. 293, p. 279-302

Paul W. O. Hoskin, F. Lin Sutherland and Patrick R. L. Browne(2005) Gas-streaming in trachyte lava, Mount Melbourne, Antarctica. Goldschmidt Conference Abstracts 2005 Environmental Geochemistry/Mineralogy

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