Geochemistry of FeMn oxyhydroxides of IODP Site 303-U1302 and 303-1303 ...

• Main Authors: Crocket, Kirsty C, Vance, Derek, Foster, Gavin L, Richards, David A, Tranter, D J
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Ice Sheet
• Online Access: https://dx.doi.org/10.1594/pangaea.816039; https://doi.pangaea.de/10.1594/PANGAEA.816039

Regional weathering intensity must have changed dramatically at high latitudes during the Quaternary as a consequence of repeated continental glaciation. Investigation of these glacial/interglacial changes at high temporal resolution is possible with the recent development of Pb isotopes in FeMn oxyhydroxide phases as a proxy for region-specific weathering intensity, where increases in the radiogenic component are thought to correspond to increased continental weathering fluxes. Here we present a Pb isotope record sourced from the FeMn oxyhydroxide fraction in marine sediments from IODP Sites U1302/3 on Orphan Knoll (~3500 mbsl, NW Atlantic), spanning the last 37 ka. Located at the eastern edge of the Laurentide Ice Sheet (LIS), Site U1302/3 is well-placed to monitor changes in weathering intensity associated with LIS glacial history. Overall, the data show a close correspondence to local surface water d18O, with least radiogenic values during times of heavy d18O (glacial maximum) and most radiogenic values ... : Supplement to: Crocket, Kirsty C; Vance, Derek; Foster, Gavin L; Richards, David A; Tranter, D J (2012): Continental weathering fluxes during the last glacial/interglacial cycle: insights from the marine sedimentary Pb isotope record at Orphan Knoll, NW Atlantic. Quaternary Science Reviews, 38, 89-99 ...