The Scotia metamorphic complex at Cape Bowles, Clarence Island, South Shetland Islands, western Antarctica.

F. Herve, R. J. Pankhurst

Resultado de la investigación: Article

4 Citas (Scopus)

Resumen

Samples of phyllite and schist from Cape Bowles have a relatively simple structure related to isoclinal folding, with an axial cleavage. A series of arenaceous sediments derived from an acid igneous terrain appears to have been metamorphosed to greenschist-facies conditions. XRF analyses for 7 rocks are accompanied by probe analyses for white mica, epidote, chlorite and albite, together with minerals from the higher-grade rocks of Elephant Island, some 40 km west (M.A. 83M/1025). Rb/Sr data for 9 rocks from Cape Bowles give an isochron age of 71 + or - 40 m.y., i.e. the same Late Cretaceous (70-100 m.y.) event recorded elsewhere in the Scotia complex; initial 87Sr/86Sr ratios (0.7094 + or - 0.0005) are consistent with a Mesozoic rather than a Precambrian source area.-R.A.H.

Idioma originalEnglish
Páginas (desde-hasta)15-24
Número de páginas10
PublicaciónBritish Antarctic Survey Bulletin
Volumen62
EstadoPublished - 1984

Huella dactilar

rock
phyllite
elephant
epidote
greenschist facies
albite
X-ray fluorescence
mica
schist
cleavage
chlorite
folding
Precambrian
probe
Cretaceous
acid
mineral
sediment
Antarctica

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Citar esto

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abstract = "Samples of phyllite and schist from Cape Bowles have a relatively simple structure related to isoclinal folding, with an axial cleavage. A series of arenaceous sediments derived from an acid igneous terrain appears to have been metamorphosed to greenschist-facies conditions. XRF analyses for 7 rocks are accompanied by probe analyses for white mica, epidote, chlorite and albite, together with minerals from the higher-grade rocks of Elephant Island, some 40 km west (M.A. 83M/1025). Rb/Sr data for 9 rocks from Cape Bowles give an isochron age of 71 + or - 40 m.y., i.e. the same Late Cretaceous (70-100 m.y.) event recorded elsewhere in the Scotia complex; initial 87Sr/86Sr ratios (0.7094 + or - 0.0005) are consistent with a Mesozoic rather than a Precambrian source area.-R.A.H.",
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T1 - The Scotia metamorphic complex at Cape Bowles, Clarence Island, South Shetland Islands, western Antarctica.

AU - Herve, F.

AU - Pankhurst, R. J.

PY - 1984

Y1 - 1984

N2 - Samples of phyllite and schist from Cape Bowles have a relatively simple structure related to isoclinal folding, with an axial cleavage. A series of arenaceous sediments derived from an acid igneous terrain appears to have been metamorphosed to greenschist-facies conditions. XRF analyses for 7 rocks are accompanied by probe analyses for white mica, epidote, chlorite and albite, together with minerals from the higher-grade rocks of Elephant Island, some 40 km west (M.A. 83M/1025). Rb/Sr data for 9 rocks from Cape Bowles give an isochron age of 71 + or - 40 m.y., i.e. the same Late Cretaceous (70-100 m.y.) event recorded elsewhere in the Scotia complex; initial 87Sr/86Sr ratios (0.7094 + or - 0.0005) are consistent with a Mesozoic rather than a Precambrian source area.-R.A.H.

AB - Samples of phyllite and schist from Cape Bowles have a relatively simple structure related to isoclinal folding, with an axial cleavage. A series of arenaceous sediments derived from an acid igneous terrain appears to have been metamorphosed to greenschist-facies conditions. XRF analyses for 7 rocks are accompanied by probe analyses for white mica, epidote, chlorite and albite, together with minerals from the higher-grade rocks of Elephant Island, some 40 km west (M.A. 83M/1025). Rb/Sr data for 9 rocks from Cape Bowles give an isochron age of 71 + or - 40 m.y., i.e. the same Late Cretaceous (70-100 m.y.) event recorded elsewhere in the Scotia complex; initial 87Sr/86Sr ratios (0.7094 + or - 0.0005) are consistent with a Mesozoic rather than a Precambrian source area.-R.A.H.

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