Lower Triassic lacustrine sediments in La Coipa area, Atacama, Chile

M. Suárez, C. M. Bell, T. Hutter

Resultado de la investigación: Article

5 Citas (Scopus)

Resumen

Lower Triassic lacustrine sediments in an area of at least 300 km2 at the La Coipa Mine area (26°50′ S, 69°15′ W), in northern Chile, indicate a large, actively subsiding lake, which was at one time evaporitic. This lake was surrounded by highlands dominated by outcrops of Late Paleozoic volcanic rocks and granitoids. An open lacustrine environment includes black hemipelagic shales with intercalated thin and medium-grained turbidites probably representing a channel-levee complex. The coarse-grained, lake margin sediments are dominated by debris-flow deposits and turbidites with intercalated black shales. These represent either the subaqueous part of a fan delta (formed during low-stand) or subaqueous talus (formed in a high stand). The Lower Triassic age, given by palynomorphs, represents the first documentation of strata of this age in Chile and apparently in the Andes. It indicates that basins of probable extensional origin were forming prior to the previously accepted Middle-Late Triassic age.

Idioma originalEnglish
Páginas (desde-hasta)9-15
Número de páginas7
PublicaciónJournal of South American Earth Sciences
Volumen8
N.º1
DOI
EstadoPublished - 1 ene 1995

Huella dactilar

lacustrine deposit
Triassic
lake
fan delta
talus
lacustrine environment
levee
debris flow
volcanic rock
outcrop
Paleozoic
basin
sediment
documentation

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geology

Citar esto

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Lower Triassic lacustrine sediments in La Coipa area, Atacama, Chile. / Suárez, M.; Bell, C. M.; Hutter, T.

En: Journal of South American Earth Sciences, Vol. 8, N.º 1, 01.01.1995, p. 9-15.

Resultado de la investigación: Article

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