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Geochemical analysis, micropalaeontological analysis and radiometric dating    techniques were performed on four gravity cores, G-1, G-2, A-3 and A-6, recovered    during the BIO Hesperides expeditions GEBRA-93 and FRUELA-96 from the Bransfield    Strait (Antarctica). Moreover, in order to improve the sedimentation rate    control we tentatively relate abundance variations in the sea-ice taxa group    (SITG) to air temperature estimations based on Deuterium contents in Vostok    ice-core. The results of diatom analyses were related to the sequence of    neoglacial events that have occurred over the last three millennia. For these    periods, a restricted communication between the Weddell, Bransfield and Bellingshausen    seas has been proposed. The abundance patterns of diatom valves, resting    spores (RS) of the diatom Chaetoceros and opal content agree with    the high productivity values previously reported for the area. The significant    reduction Chaetoceros RS towards the present is interpreted as a    reduction in surface productivity. Trend differences between Chaetoceros RS    and TOC contents are explained in terms of organic matter preservation. Diatom    communities from the Bransfield Strait did not play an important role in    the global CO2 cycle during cold periods. Bio- and geochemical    changes have overprinted high frequency cyclicity at about 200-300 yr, which  might be related to the 200-yr solar cycle

Holocene neoglacial events in the Bransfield Strait (Antarctica). Palaeocenographic and paleoclimatic significance