(Table S1) Results of Nd measurements on uncleaned, mixed-planktonic foraminiera, bulk sediment leachates and detrital material ...

• Main Authors: Dausmann, Veit, Frank, Martin, Gutjahr, Marcus, Rickli, Jörg Dominik
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Sample code/label; Method comment; DEPTH, sediment/rock; AGE; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, standard deviation; ε-Neodymium; ε-Neodymium, standard deviation; Hafnium-176/Hafnium-177; Hafnium-176/Hafnium-177, standard deviation; ε-Hafnium; ε-Hafnium, standard deviation; Northern Component Water; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg177; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic; NADW; North Atlantic Deep Water; North Atlantic; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.871943; https://doi.pangaea.de/10.1594/PANGAEA.871943

Combined seawater radiogenic hafnium (Hf) and neodymium (Nd) isotope compositions were extracted from bulk sediment leachates and foraminifera of Site 1088, ODP Leg 177, 2082 m water depth on the Agulhas Ridge. The new data provide a continuous reconstruction of long and short-term changes in ocean circulation and continental weathering inputs since the Mid-Miocene. Due to its intermediate water depth the sediments of this core sensitively recorded changes in admixture of North Atlantic Deep Water (NADW) to the Antarctic Circumpolar Current (ACC) as a function of the strength of the Atlantic Meridional Overturning Circulation (AMOC).Nd isotope compositions (epsilon-Nd) range from -7 to -11 with glacial values generally 1 to 3 units more radiogenic than during the interglacials of the Quaternary. The data reveal episodes of significantly increased AMOC strength during late Miocene and Pliocene warm periods whereas peak radiogenic epsilon-Nd values mark a strongly diminished AMOC during the major ... : Supplement to: Dausmann, Veit; Frank, Martin; Gutjahr, Marcus; Rickli, Jörg Dominik (2017): Glacial reduction of AMOC strength and long term transition in weathering inputs into the Southern Ocean since the Mid Miocene: Evidence from radiogenic Nd and Hf isotopes. Paleoceanography, 32(3), 265-283 ...