RT Journal Article
T1 Ciclos de precesión en el Toarciense de la Cuenca VascoCantábrica
T1 Precession-forcing cycles in the Toarcian of the Basque-Cantabrian basin
A1 Berreteaga, A.
A1 Robles, Sergio
A1 Rosales, Idoia
A1 Quesada, Santiago
AB High-frequency Milankovitch cycles have been identified in the Liassic hemipelagic carbonates of the Basque-Cantabrian basin. The cycles detected are attributed to precession forcing. VVe examined this high frequency cycling using advanced spectral analysis of the secular variation in the CaC03 (wt%) content of the hemipelagic rocks. However, the same spectral analyses applied to the temporal variations of the total organic carbon (TOO and 8*3C of the sediment do not found the same cyclicity. This suggest that the high-frequency orbital forcing may have not been a main control on organic productivity, sea bottom anoxia and/or rate of organic matter burial, which may have been controlled by other intrinsic or extrinsic factors.The results of this study will be applied to other chemostratigraphic analyses been conducted in the middle-upper Lias hemipelagic rocks of the Basque-Cantabrian basin in order to test if the previously detected palaeoceanic temperature variations may be related to preccesion cycles
PB Sociedad Geológica de España
YR 2002
FD 2002
LK http://hdl.handle.net/10272/9144
UL http://hdl.handle.net/10272/9144
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026