Primeros resultados magnetoestratográficos del Triásico Medio-Superior (Ladiniense-Karniense)en la cordillera Ibérica occidental (cuevas de Ayllón)
- Ruiz, V.C.
- Sopeña, A.
- Rey, D.
- Villalaín, J.J.
- Gialanella, P.R.
- Osete, M.L.
ISSN: 0213-683X
Year of publication: 1998
Issue: 25
Pages: 179-182
Type: Article
More publications in: Geogaceta
Abstract
A magnetostratigraphic investigation on a Middle-Late Triassic section outcropping at Cuevas de Ayllon (westernmost margin of the Iberian Ranges, Spain) has been performed. The section mostly consists of a thick sequence of interbedded mudstones and sandstones. The age of the sampled formation has been established as Ladinian-Karnian on the basis of palynological assemblages. 123 samples were subjected to a progressive thermal demagnetization up to 680 °C.A multicomponent magnetization behaviour has been observed. The characteristic component could be isolated from 575-620 °C up to 680 ° C, in 74 samples showed both polarities and allowed to define a consistent magnetic zonation. The data presented will contribute to the construction of a standard polarity scale for the Triassic time span
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