Ukrainian Antarctic journal

No 12 (2013): Ukrainian Antarctic Journal
Articles

Magma layering of gabbroids of Antarctic Peninsula batholith

G. Artemenko
M.P. Semenenko Institute of geochemistry, mineralogy and ore formation of the National Academy of Sciences of Ukraine, Kyiv
V. Bakhmutov
Institute of Geophysics of the National Academy of Sciences of Ukraine, Kyiv
I. Samborska
M.P. Semenenko Institute of geochemistry, mineralogy and ore formation of the National Academy of Sciences of Ukraine, Kyiv
L. Bakhmutova
National Antarctic Scientific Center of the State Agency for Science, Innovations and Informatization of Ukraine, Kyiv
V. Shpyra
Institute of Geophysics of National Academy of Science of Ukraine, Kyiv
Published December 15, 2013
Keywords
  • gabbroid,
  • batholith,
  • inch layering,
  • pyroxene,
  • layered mafic intrusion,
  • norites,
  • anorthosites
  • ...More
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Abstract

The rhythmic layering of coarse-grained gabbroids of late intrusive phase is first detected on the Peterman island. There is similar to the inch layering in well known Stillwater massif. It is caused by alternating bands of gabbroids with varying amounts of pyroxene and ore minerals. In the dark bands of the crystal size of 4×5 mm, and in lightbands - up to 1×2 mm. Following our interpretation the cross-bedding in gabbroids on the contact of melanocratic and light gray gabbroids at Cape Tuxen as a result of crystallization of minerals in the fast flowof magma is proposed. There is important for understanding the formation of layered mafic intrusion and assess the prospects for their ore.