INVESTIGADORES
REMESAL Marcela Beatriz
congresos y reuniones científicas
Título:
The Geology of Half Moon Island, South Shetland Islands, Antarctica.
Autor/es:
PARICA, C.A.; REMESAL, M.B.
Lugar:
Kiel
Reunión:
Otro; th 20 Colloquium Latin American Earth Sciences; 2007
Institución organizadora:
LAK
Resumen:
Half Moon Island is one of the South Shetland
Islands Archipelago, on the North of
the Antarctic Peninsula, is located inside the
Luna Bay of Livingston Island. The island
was repositioned with GPS technology (for
geodesic datum WGS84). Parica et al.(2002)
defined the stratigraphy of the island. The oldest
rocks are vulcanites of cretaceous age with
the presence of lavas and brecciated lavas,
of andesitic and basandesitic composition. It
is very important the hydrothermal alteration.
On exposed surfaces the lavas are deeply
dark, with textures of auto breccia and scoria.
The cretaceous plutonism is represented
by tonalites, monzodiorites and gabbros. The
main outcrops of gabbros are located in southernmost
of the island, Fliess Point-Rosales
Beacon (penguin colony). The gabbros have
medium grain, with grey dark colors crossed
by dikes. They are rocks of hypidiomorphic
texture,with plagioclase (An64-50), clinopyroxene
with unmixing textures. Chlorite is the
main alteration of these minerals. Some exolution
of oxides are also ecognizable too. The
best outcrops of tonalites and monzodiorites
are located at the Capanegra Hill and the south
section of the Saddleback Hill.
