Evolución térmica de distintas masas de agua a lo largo del estadio isotópico marino 7 basada en el Mg/Ca de la concha de los foraminífreos planctónicos

Resum

Mg/Ca measurements have been performed on tests from the planktonic foraminifers Globigerinoides ruber (white) and Globigerina bulloides in samples from ODP site 977A in the Alboran Sea (Western Mediterranean) in order to estimate their calcification temperatures between 250 and 190 ka and therefore, analyse the evolution of different water masses in the Alboran Sea during that time. The results obtained are similar to the sea surface temperatures estimated by other methods in previous studies carried out in the same core. All substages in marine isotope stage 7 are well defined in the paleotemperature estimates, excepting substage 7.2 which is not recognized in Globigerina bulloides. Warm substages were characterized by strong seasonality and thermal stratification of the water column. By contrast, less pronounced seasonality and basin stratification seem to have prevailed during cold substages.