Metamorphic P-T conditions of late jurassic rhyolites in the magallanes fold and thrust belt, Patagonian Andes, Chile

F. Hervé, H. J. Massonne, M. Calderón, T. Theye

Resultado de la investigación: Article

9 Citas (Scopus)

Resumen

Foliated meta-rhyolites of the Late Jurassic Tobífera Formation, form two thrust slices in the Patagonian Andes fold and thrust belt. They display a penetrative mylonitic foliation which has been developed at a regional scale. Except for quartz porphyroclasts, most of the mineral assemblage present in the rocks is of metamorphic origin. The synkinematic minerals in the strain shadows are similar in composition to those in the matrix. The metamorphic mineralogy indicates a metamorphic evolution ranging between 3 kbar (ca. 250°C) and close to 7 kbar (ca.350°C), and the synkinematic growth of the minerals suggests that they formed during the Early to middle Cretaceous compressional phase in the area, which possibly involved west directed subduction of the quasi oceanic floor that underlies the Tobífera Formation.

Idioma originalEnglish
Páginas (desde-hasta)5-16
Número de páginas12
PublicaciónJournal of Iberian Geology
Volumen33
N.º1
EstadoPublished - 2007

Huella dactilar

fold and thrust belt
P-T conditions
Jurassic
mineral
foliation
mineralogy
subduction
thrust
quartz
Cretaceous
matrix
rock

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Citar esto

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AU - Hervé, F.

AU - Massonne, H. J.

AU - Calderón, M.

AU - Theye, T.

PY - 2007

Y1 - 2007

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AB - Foliated meta-rhyolites of the Late Jurassic Tobífera Formation, form two thrust slices in the Patagonian Andes fold and thrust belt. They display a penetrative mylonitic foliation which has been developed at a regional scale. Except for quartz porphyroclasts, most of the mineral assemblage present in the rocks is of metamorphic origin. The synkinematic minerals in the strain shadows are similar in composition to those in the matrix. The metamorphic mineralogy indicates a metamorphic evolution ranging between 3 kbar (ca. 250°C) and close to 7 kbar (ca.350°C), and the synkinematic growth of the minerals suggests that they formed during the Early to middle Cretaceous compressional phase in the area, which possibly involved west directed subduction of the quasi oceanic floor that underlies the Tobífera Formation.

KW - Chile

KW - Metamorphism

KW - Patagonian andes

KW - Tobífera formation

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