PANGAEA_973140 Pb isotope composition in the ferromanganese crust PS75/247-2 Huang, Huang; Gutjahr, Marcus; Song, Zhaoyang; Fietzke, Jan; Frank, Martin; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Christl, Marcus; Garbe-Schönberg, Dieter; Goepfert, Tyler J; Eisenhauer, Anton Pb isotope composition in the ferromanganese crust PS75/247-2 2024-10-24 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.973140 Investigator Huang Huang huang17323@gmail.com Earth Science Analytical method Age DEPTH, sediment/rock Distance Lead-206/Lead-204 ratio Lead-206/Lead-204 ratio, standard error Lead-207/Lead-204 ratio Lead-207/Lead-204 ratio, standard error Lead-208/Lead-204 ratio Lead-208/Lead-204 ratio, standard error Lead-208/Lead-206 ratio Lead-208/Lead-206 ratio, standard error Lead-207/Lead-206 ratio Lead-207/Lead-206 ratio, standard error Lead-208/Lead-207 ratio Lead-208/Lead-207 ratio, standard error geoscientificInformation Antarctic Circumpolar Current ANT-XXVI/3 Dredge Ferromanganese crust Pb isotopes PS75/247-2 Laser ablation multicollector - ICP-MS (LA-MC-ICP-MS) Calculated, 2 standard error Polarstern 2010-03-23 2010-03-23 Complete -69.142167 -69.142167 -123.218833 -123.218833 0.0 m (DEPTH, sediment/rock) 0.0 m (DEPTH, sediment/rock) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 15510 data points text/tab-separated-values Huang, Huang; Gutjahr, Marcus; Song, Zhaoyang; Fietzke, Jan; Frank, Martin; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Christl, Marcus; Garbe-Schönberg, Dieter; Goepfert, Tyler J; Eisenhauer, Anton (2024): Seawater Lead Isotopes Record Early Miocene to Modern Circulation Dynamics in the Pacific Sector of the Southern Ocean. Paleoceanography and Paleoclimatology, 39(12), e2024PA004922, https://doi.org/10.1029/2024PA004922

Lead (Pb) isotope measurements are performed in the ferromanganese crust PS75/247-2, dredged on the southern flank of Haxby Seamount in the Pacific sector of the SO, using laser ablation coupled to a MC-ICP-MS (LA-MC-ICP-MS). The measurement is targeted at the bulk sample in this crust. We used smaller laser spot sizes (each integrating about 8 kyr of growth) to resolve glacial-interglacial cyclic Pb isotope variations in the youngest part of our record. We also used larger laser spot sizes to integrate a sampling interval of approximately 40 kyr of growth (i.e., one early Pleistocene glacial cycle) in order to detect long-term changes beyond orbital cyclicity throughout the past 20 Ma. In order to verify the laser ablation-based Pb isotope data, the Pb isotope compositions of samples from 10 different depths in crust Haxby was also analysed by conventional solution-based method. The depth in the sample list represents the distance from the measurement spot to the sample surface. Pb isotope is a sensitive water mass tracer and our data reveal that the Antarctic Circumpolar Current (ACC) has experienced five stable circulation states since the early Miocene which were separated by four major transitions observed at 17.5-14.6, 12, 10 and 5 Ma. According to our data the modern ACC configuration formed 5 million years ago, likely in response to the closure of the Panama Seaway. Our data also show that changes in the latitudinal position of the ACC were linked to the middle Miocene waxing and waning of the Antarctic ice sheets, which emphasizes the ACC's critical role as a key control of Antarctic glaciation. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.973140"!

https://doi.org/10.1029/2024PA004922 Seawater Lead Isotopes Record Early Miocene to Modern Circulation Dynamics in the Pacific Sector of the Southern Ocean https://doi.org/10.17815/jlsrf-3-163 Polarstern https://store.pangaea.de/Images/Cores/PS-stationcard/PS75_247-stationcard.pdf PS75/247-2 DIF 9.4 2024-10-24 2026-10-14