INVESTIGADORES
HALLER Miguel Jorge Francisco
artículos
Título:
Preliminary K/Ar Geochronology of the Crater Basalt Volcanic Field (CBVF), Northern Patagonia
Autor/es:
PÉCSKAY Z; HALLER MJ; NÉMETH K
Revista:
Asociación Geológica Argentina Revista
Editorial:
Asociación Geológica Argentina
Referencias:
Lugar: Buenos Aires; Año: 2007 vol. 62 p. 25 - 29
ISSN:
0004-4822
Resumen:
The Crater Basalt volcanic field is one of the Quaternary intraplate basaltic fields in northern Patagonia. A systematic geological, volcanological and geochronological study of CBVF indicates a "multistage history" of eruptions of basaltic volcanoes. K/Ar dating, using whole rock samples shows that the measured analytical ages are fully consistent with the available stratigraphic control. The radiometric ages fall into three distinct, internally consistent age groups, which give evidence that there were at least three major episodes of volcanic activity, at about 1.0 Ma, 0.6 Ma and 0.3 Ma ago. The age differences appear to be just significant, even although less than 10 % radiogenic argon was found in the isotope analysis of whole rock samples.
