Petrography and geochemistry of the Carboniferous-Triassic Trinity Peninsula Group, West Antarctica: Implications for provenance and tectonic setting

Paula Castillo, Juan Pablo Lacassie, Carita Augustsson, Francisco Hervé

Resultado de la investigación: Article

12 Citas (Scopus)

Resumen

The Carboniferous-Triassic Trinity Peninsula Group is a metasedimentary sequence that crops out widely in the northern Antarctic Peninsula. These are some of the most extensive outcrops in the area and hold the key to evaluating the connections of the Antarctic Peninsula in Gondwana; however, they are still poorly understood. Here we present our provenance study of the Trinity Peninsula Group using petrographic and geochemical approaches in combination with cathodoluminescence of detrital quartz in order to constrain its source characteristics and tectonic setting. Using differences in modal composition and quartz cathodoluminescence characteristics, we define three petrofacies derived from the progressive uplift and erosion of a volcano-plutonic continental arc, which exposed the plutonic-metamorphic roots. As indicated by major and trace elements, the source is felsic with a composition ranging from tonalitic to granodioritic. The relatively unweathered condition of the source area points to a dry and cold climate at the time of deposition, but this does not necessarily mean that it was glaciated. Deposition of the sediments occurred within an active continental margin, relatively close to the source area, probably along the south Patagonia-Antarctic Peninsula sector of Gondwana. Strong chronological, petrological and chemical similarities with the sediments of the Duque the York Complex in Patagonia suggest that they were derived from the same source.

Idioma originalEnglish
Páginas (desde-hasta)575-588
Número de páginas14
PublicaciónGeological Magazine
Volumen152
N.º4
DOI
EstadoPublished - 1 ene 2015

Huella dactilar

cathodoluminescence
petrography
tectonic setting
Gondwana
provenance
Triassic
geochemistry
quartz
continental arc
sediment
continental margin
outcrop
volcano
uplift
trace element
erosion
crop
climate
Antarctica
chemical

ASJC Scopus subject areas

  • Geology

Citar esto

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Petrography and geochemistry of the Carboniferous-Triassic Trinity Peninsula Group, West Antarctica : Implications for provenance and tectonic setting. / Castillo, Paula; Lacassie, Juan Pablo; Augustsson, Carita; Hervé, Francisco.

En: Geological Magazine, Vol. 152, N.º 4, 01.01.2015, p. 575-588.

Resultado de la investigación: Article

TY - JOUR

T1 - Petrography and geochemistry of the Carboniferous-Triassic Trinity Peninsula Group, West Antarctica

T2 - Implications for provenance and tectonic setting

AU - Castillo, Paula

AU - Lacassie, Juan Pablo

AU - Augustsson, Carita

AU - Hervé, Francisco

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