Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting

Palaeomagnetic data from 15 hand samples collected in a sequence of tuffs of Carboniferous age (Andacollo Series) exposed in western Argentina (37°10′S, 70°38′W) are given. These samples show hydrothermal alteration. After AF and thermal cleaning the majority of samples show reversed polarity and yi...

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Publicado: 1978
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v40_n1_p101_Vilas
http://hdl.handle.net/20.500.12110/paper_0012821X_v40_n1_p101_Vilas
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0012821X_v40_n1_p101_Vilas
record_format dspace
spelling paper:paper_0012821X_v40_n1_p101_Vilas2023-06-08T14:35:33Z Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting Palaeomagnetic data from 15 hand samples collected in a sequence of tuffs of Carboniferous age (Andacollo Series) exposed in western Argentina (37°10′S, 70°38′W) are given. These samples show hydrothermal alteration. After AF and thermal cleaning the majority of samples show reversed polarity and yield a palaeomagnetic pole at 73.6°S, 64.7°E (dψ = 6°, dχ = 9°). By comparing the position of this pole with the apparent polar wander curve recognized for the Late Palaeozoic and Mesozoic of South America, quantitative support for a Cretaceous age for the cleaned remanence of these samples is given. K-Ar dating of the Andacollo rocks indicates a mean age of 69 ± 4 m.y.; this suggests that the isotopic system of these rocks became closed in Late Cretaceous time. Palaeomagnetic and radiometric data agree indicating a Cretaceous age for the hydrothermal alteration of the Andacollo rocks. © 1978. 1978 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v40_n1_p101_Vilas http://hdl.handle.net/20.500.12110/paper_0012821X_v40_n1_p101_Vilas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Palaeomagnetic data from 15 hand samples collected in a sequence of tuffs of Carboniferous age (Andacollo Series) exposed in western Argentina (37°10′S, 70°38′W) are given. These samples show hydrothermal alteration. After AF and thermal cleaning the majority of samples show reversed polarity and yield a palaeomagnetic pole at 73.6°S, 64.7°E (dψ = 6°, dχ = 9°). By comparing the position of this pole with the apparent polar wander curve recognized for the Late Palaeozoic and Mesozoic of South America, quantitative support for a Cretaceous age for the cleaned remanence of these samples is given. K-Ar dating of the Andacollo rocks indicates a mean age of 69 ± 4 m.y.; this suggests that the isotopic system of these rocks became closed in Late Cretaceous time. Palaeomagnetic and radiometric data agree indicating a Cretaceous age for the hydrothermal alteration of the Andacollo rocks. © 1978.
title Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
spellingShingle Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
title_short Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
title_full Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
title_fullStr Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
title_full_unstemmed Palaeomagnetism and K-Ar dating of the Carboniferous Andacollo Series (Argentina) and the age of its hydrothermal overprinting
title_sort palaeomagnetism and k-ar dating of the carboniferous andacollo series (argentina) and the age of its hydrothermal overprinting
publishDate 1978
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v40_n1_p101_Vilas
http://hdl.handle.net/20.500.12110/paper_0012821X_v40_n1_p101_Vilas
_version_ 1768542580712144896

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