Late Quaternary paleoclimate in semiarid northeastern Brazil from U-series dating of travertine and water-table speleothems

Auteurs :
AULER, A.S.
SMART, P.L.

Description :
Fossil travertine and subaqueous speleothems in presently dry caves suggest periods of enhanced ground-water recharge during the Quaternary in semiarid northeastern Brazil. Travertine deposits and water-table speleothems were dated by the Th230/U234 technique, yielding new evidence for the timing of past periods of increased rainfall. The results thus indicate that significant variability in regional rainfall patterns occurred in the area during glaciations and caution against overgeneralization of paleoclimate patterns.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 2001, vol. 55, n°. 2, p. 159-167, Collation : Illustration, Références bibliographiques : 46 ref.

Date :
2001

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier