The geology of Cape Dubouzet, northern Antarctic Peninsula: continental basement to the Trinity Peninsula Group?

Francisco Hervé, Jorge Lobato, Ignacio Ugalde, Robert J. Pankhurst

Resultado de la investigación: Article

8 Citas (Scopus)

Resumen

Cape Dubouzet is mainly composed of a volcanic-subvolcanic complex of extrusive rhyolitic breccias, a banded rhyolite and a semi-annular body of dacite porphyry rich in xenoliths of metamorphic rocks. Major and gEE geochemistry indicate that the volcanic rocks are calc-alkaline and that they are genetically related by fractional crystallization of a plagioclase- bearing assemblage from a common magma. Rb-Sr data suggest that the rhyolitic complex is of Middle-to-Late Jurassic age, and that it is intruded by Late Cretaceous stocks of banded diorite and gabbro. All these rocks are partially covered by moraines whose clasts are of local provenance. Xenoliths in the dacite porphyry suggest that the northern tip of the Antarctic Peninsula is underlain by a metamorphic complex composed of amphibolites, meta-tonalites and pelitic gneiss containing garnet, sillimanite, cordierite, hercynite, and andalucite. Such rocks are not known in the Scotia metamorphic complex, nor in the Trinity Peninsula Group and its low grade metamorphic derivatives, which also occur as rare xenoliths in the dacite. Previous dating of xenoliths collected from the moraines suggested a late Carboniferous age for this amphibolite-grade metamorphism. Both the Jurassic-Cenozoic magmatic arc of the Antarctic Peninsula and the accretionary complex rocks of the Trinity Peninsula Group were thus developed, at least in part, over pre-existing continental crust.

Idioma originalEnglish
Páginas (desde-hasta)407-414
Número de páginas8
PublicaciónAntarctic Science
Volumen8
N.º4
EstadoPublished - dic 1996

Huella dactilar

dacite
geology
rocks
porphyry
Jurassic
rock
hercynite
gneiss
plagioclase
volcanic rocks
Agrotis
metamorphic rocks
geochemistry
cordierite
sillimanite
diorite
crystallization
amphibolite
rhyolite
fractional crystallization

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Science(all)
  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Geology

Citar esto

Hervé, Francisco ; Lobato, Jorge ; Ugalde, Ignacio ; Pankhurst, Robert J. / The geology of Cape Dubouzet, northern Antarctic Peninsula : continental basement to the Trinity Peninsula Group?. En: Antarctic Science. 1996 ; Vol. 8, N.º 4. pp. 407-414.
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The geology of Cape Dubouzet, northern Antarctic Peninsula : continental basement to the Trinity Peninsula Group? / Hervé, Francisco; Lobato, Jorge; Ugalde, Ignacio; Pankhurst, Robert J.

En: Antarctic Science, Vol. 8, N.º 4, 12.1996, p. 407-414.

Resultado de la investigación: Article

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