Datación magnetoestratigráfica de la cuenca terciaria de As Pontes (Galicia, NW de España)
- A. Huerta 1
- J.M. Parés 2
- L. Cabrera 1
- B. Ferrús 1
- A. Sáez 1
- 1 Dep. de Geologia dinámica, Geofísica i Paleontologia, Univ. de Barcelona
- 2 Institut de Ciencies de la Terra (Jaume Almera) C.S.l.C., Barcelona
ISSN: 0213-683X
Année de publication: 1996
Número: 20
Pages: 1021-1024
Type: Article
D'autres publications dans: Geogaceta
Résumé
The Tertiary Basin of As Pontes (Northwest Spain) has been dated by means of magnetostratigraphy. A total of four local magnetostratigraphic successions have been constructed. In the four succesions 500 sites were sampled at an average spacing of aproximately 2 m. The mineral is that carriy the magnetisation in the studied rocks are magnetite and iron sulphides. Correlation to CPTS show that sedimentation in the basin began before the end of the Chron 10r with an age of 28. 7 My and it lasted, at least, until the end of the subchron 6Mr.2n with an age of 22.5 My. The duration of the sedimentation in the basin was about 6.2 My, and it comprises from the upper most Early Oligocene(upper part of the Stampian) to the Early Miocene (upper Aquitanian).