Estudio geoquímico de fósiles de vertebrados de varias localidades del Cretácico Superior y Paleógeno de los Pirineos occidentales.

  1. Berreteaga Escudero, Ana
  2. Badiola Kortabitarte, Ainara
  3. Astibia Ayerra, Humberto
  4. Pereda Suberbiola, Xabier
  5. Elorza Zandueta, José Javier
  6. Etxebarria Loizate, Nestor
  7. Álvarez, Alberto
Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2004

Issue: 36

Pages: 167-170

Type: Article

More publications in: Geogaceta

Abstract

The diagenetic history of four vertebrate localities from the western Pyrenees (Laño and Zambrana in the Basque-Cantabrian Region, Ardanatz and Uztarrotz in the Pamplona Basin) is analyzed. The sites range stratigraphically from the Upper Cretaceous (Laño) to the Middle-Upper Eocene (Ardanatz, Uztarrotz, and Zambrana), and correspond to different sedimentary environments. The replacement of biogenic hydroxyapatite by well-crystallized francolite (carbonate fluorapatite) is related to diagenetic changes in all localities. Geochemical techniques based on variance in trace element composition from different fossil bone assemblages can be used as a test to measure the relative degree of mixing or taphonomic averaging within vertebrate associations. The geochemical composition and trends of the fossil remains suggest that the diagenetic processes were relatively uÍliform in all the sites, although REE trends in each particular sites are different, which precludes mixing of reworked bones.