Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes
作者： Paula Diz , Ian R. Hall , Rainer Zahn , Elizabeth G. Molyneux
DOI: 10.1029/2007PA001511
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摘要: Benthic foraminiferal assemblages and the carbon isotope composition of epifaunal benthic foraminifera Epistominella exigua Fontbotia wuellerstorfi have been investigated along core MD02-2589 located at southern Agulhas Plateau (41°26.03′S, 25°15.30′E, 2660 m water depth). This study aims to evaluate changes in paleoenvironment its influence on δ 13C with a notable focus E. exigua, species associated phytodetritus deposits poorly studied paleoceanographic reconstructions. The (>63 μm) show large fluctuations suggesting significant pattern ocean surface productivity conceivably related migrations Subtropical Convergence (STC) Subantarctic Front (SAF). Low moderate seasonality relatively higher food supply seafloor are indicated during glacial marine stages (MIS) 6, 4, 2 MIS 3, probably northward migration SAF confluence more stationary STC above flank Plateau. lowest organic is from late 5b 4 as consequence increased (AF) and/or weakening over region. Episodic delivery fresh matter, similar modern conditions location, 5c–MIS 5e Termination I. Comparison this paleoenvironmental information paired records F. suggests that offsets ambient bottom 13CDIC, while amplitude, glacial-interglacial timescales, does not seem affected by seafloor. calcifies preferentially short time span year when peaks delivered Therefore offset potentially faithfully amplitude 13CDIC than wuellerstorfi, notably settings such Southern Ocean experienced substantial through
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