A note on Lower Jurassic magmatism in the Coastal Cordillera of Atacama, Chile

J. A. Naranjo, A. Puig, M. Suárez

Resultado de la investigación: Article

3 Citas (Scopus)

Resumen

Radiometric dates on specimens of plutons of the Coastal Cordillera of Atacama span the period 300-110 Ma. A group of dates cluster around 190 Ma and evidence is presented which strongly suggests that they represent near crystallization ages. The geographic distribution of these plutons, adjacent to Liassic tuffs and lavas (Pan de Azúcar and Posada de los Hidalgo formations), suggests a genetic relationship between them, and that the plutons were the roots of the Lower Jurassic volcanic chain. The location of these granitoids to the west of the Liassic volcanic rocks, favours a previous idea that the Liassic basin extended eastwards as a back-arc or intra-arc basin. The host rocks to the Lower Jurassic plutons include Palaeozoic granitoids and metasedimentary rocks, indicating that the volcanic chain was founded on continental crust. The distance from the Liassic plutons to the present-day trench is less than 100 km, which indicates the possibility that part of the arc-trench system of that time is missing.

Idioma originalEnglish
Páginas (desde-hasta)699-702
Número de páginas4
PublicaciónGeological Magazine
Volumen123
N.º6
DOI
EstadoPublished - 1986

Huella dactilar

cordillera
pluton
magmatism
Jurassic
trench
metasedimentary rock
basin
host rock
continental crust
volcanic rock
crystallization
Paleozoic

ASJC Scopus subject areas

  • Geology
  • Earth and Planetary Sciences (miscellaneous)

Citar esto

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A note on Lower Jurassic magmatism in the Coastal Cordillera of Atacama, Chile. / Naranjo, J. A.; Puig, A.; Suárez, M.

En: Geological Magazine, Vol. 123, N.º 6, 1986, p. 699-702.

Resultado de la investigación: Article

TY - JOUR

T1 - A note on Lower Jurassic magmatism in the Coastal Cordillera of Atacama, Chile

AU - Naranjo, J. A.

AU - Puig, A.

AU - Suárez, M.

PY - 1986

Y1 - 1986

N2 - Radiometric dates on specimens of plutons of the Coastal Cordillera of Atacama span the period 300-110 Ma. A group of dates cluster around 190 Ma and evidence is presented which strongly suggests that they represent near crystallization ages. The geographic distribution of these plutons, adjacent to Liassic tuffs and lavas (Pan de Azúcar and Posada de los Hidalgo formations), suggests a genetic relationship between them, and that the plutons were the roots of the Lower Jurassic volcanic chain. The location of these granitoids to the west of the Liassic volcanic rocks, favours a previous idea that the Liassic basin extended eastwards as a back-arc or intra-arc basin. The host rocks to the Lower Jurassic plutons include Palaeozoic granitoids and metasedimentary rocks, indicating that the volcanic chain was founded on continental crust. The distance from the Liassic plutons to the present-day trench is less than 100 km, which indicates the possibility that part of the arc-trench system of that time is missing.

AB - Radiometric dates on specimens of plutons of the Coastal Cordillera of Atacama span the period 300-110 Ma. A group of dates cluster around 190 Ma and evidence is presented which strongly suggests that they represent near crystallization ages. The geographic distribution of these plutons, adjacent to Liassic tuffs and lavas (Pan de Azúcar and Posada de los Hidalgo formations), suggests a genetic relationship between them, and that the plutons were the roots of the Lower Jurassic volcanic chain. The location of these granitoids to the west of the Liassic volcanic rocks, favours a previous idea that the Liassic basin extended eastwards as a back-arc or intra-arc basin. The host rocks to the Lower Jurassic plutons include Palaeozoic granitoids and metasedimentary rocks, indicating that the volcanic chain was founded on continental crust. The distance from the Liassic plutons to the present-day trench is less than 100 km, which indicates the possibility that part of the arc-trench system of that time is missing.

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