Th-normalized fluxes, mass accumulation rates and age models of ODP Sites 202-1233 and 202-1234 ...

• Main Authors: Chase, Zanna, McManus, James, Mix, Alan C, Muratli, Jesse M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2014
• Subjects: Composite Core; Leg202; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.836065; https://doi.pangaea.de/10.1594/PANGAEA.836065

Biogenic particle flux was reconstructed using 230-Thorium normalization at two sites on the southern Chile margin. ODP Site 1233 at 41°S, 838 m depth, is at the southern limit of the Peru-Chile upwelling system, where the northern extent of the Antarctic Circumpolar Current impinges on the South American continental margin. ODP Site 1234, at 36°S, 1014 m depth, is located within the core of the coastal upwelling system near the mouths of the Bio Bio and Itata Rivers. At 41°S, opal, lithogenic and carbonate fluxes are greatest during the Last Glacial interval (26-20 ka), carbonate has a secondary peak during the mid Holocene (~8 ka) and organic carbon fluxes increase slightly from 17 ka to the present. At 36°S, large lithogenic fluxes are observed both during the Last Glacial interval and the Holocene, and a maximum in organic carbon flux is observed during the late Holocene (~5 ka) without an accompanying peak in opal flux. These reconstructed fluxes at 36°S and 41°S fit within a larger latitudinal pattern ... : Supplement to: Chase, Zanna; McManus, James; Mix, Alan C; Muratli, Jesse M (2014): Southern-ocean and glaciogenic nutrients control diatom export production on the Chile margin. Quaternary Science Reviews, 99, 135-145 ...