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Chase, Zanna; McManus, James; Mix, Alan C; Muratli, Jesse M (2014): Th-normalized fluxes, mass accumulation rates and age models of ODP Sites 202-1233 and 202-1234 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.836065, Supplement to: Chase, Z et al. (2014): Southern-ocean and glaciogenic nutrients control diatom export production on the Chile margin. Quaternary Science Reviews, 99, 135-145, https://doi.org/10.1016/j.quascirev.2014.06.015

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Abstract:
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 of a poleward increase in the magnitude of opal flux during the glacial period. The pattern of normalized opal flux, opal mass accumulation rate and opal:carbonate ratios is consistent with either i) enhanced supply of Si from the Southern Ocean, as proposed by the Silicic Acid Leakage Hypothesis or ii) enhanced Si and Fe delivery from land, driven by glacial erosion. The pattern of reconstructed export production supports our view that the appearance of more reducing conditions in the sediments upon deglaciation was most likely driven by decreased ventilation, rather than increased local productivity.
Related to:
Muratli, Jesse M; Chase, Zanna; Mix, Alan C; McManus, James (2010): Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water. Nature Geoscience, 3, 23-26, https://doi.org/10.1038/ngeo715
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -38.609648 * Median Longitude: -74.065780 * South-bound Latitude: -41.000080 * West-bound Longitude: -74.449860 * North-bound Latitude: -36.219217 * East-bound Longitude: -73.681700
Date/Time Start: 2002-04-12T00:00:00 * Date/Time End: 2002-04-15T00:00:00
Event(s):
202-1233 * Latitude: -41.000080 * Longitude: -74.449860 * Date/Time: 2002-04-12T00:00:00 * Elevation: -838.0 m * Penetration: 451.6 m * Recovery: 422.2 m * Location: South-East Pacific * Campaign: Leg202 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: cores; 411 m cored; 40.6 m drilled; 102.7 % recovery
202-1234 * Latitude: -36.219217 * Longitude: -73.681700 * Date/Time: 2002-04-15T00:00:00 * Elevation: -1014.7 m * Penetration: 466.7 m * Recovery: 435.2 m * Location: South Pacific Ocean * Campaign: Leg202 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 49 cores; 461.6 m cored; 5.1 m drilled; 94.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Chase, Z; McManus, J; Mix, AC et al. (2014): Age determination and model for Site 202-1233. https://doi.org/10.1594/PANGAEA.836942
  2. Chase, Z; McManus, J; Mix, AC et al. (2014): Th-normalised fluxes, opal, carbonate, organic carbon and Andean fraction from ODP Leg 202 Site 1233. https://doi.org/10.1594/PANGAEA.836059
  3. Chase, Z; McManus, J; Mix, AC et al. (2014): Accumulation rates of ODP Site 202-1233. https://doi.org/10.1594/PANGAEA.836062
  4. Chase, Z; McManus, J; Mix, AC et al. (2014): Age determination and model for Site 202-1234. https://doi.org/10.1594/PANGAEA.836943
  5. Chase, Z; McManus, J; Mix, AC et al. (2014): Th-normalised fluxes, opal, carbonate, organic carbon and Andean fraction from ODP Leg 202 Site 1234. https://doi.org/10.1594/PANGAEA.836060
  6. Chase, Z; McManus, J; Mix, AC et al. (2014): Accumulation rates of ODP Site 202-1234. https://doi.org/10.1594/PANGAEA.836064