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Corliss, Bruce H (1983): Benthic foraminifera in Southwest Indian Ocean surface sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.777974, Supplement to: Corliss, BH (1983): Distribution of Holocene deep-sea benthonic foraminifera in the southwest Indian Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 30(2), 95-117, https://doi.org/10.1016/0198-0149(83)90064-X

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Abstract:
The distribution of deep-sea benthonic foraminifera in core top samples from the southwest Indian Ocean is examined. Principal component analysis reveals two major assemblages. One assemblages between 3600 and 4800-m water depth is dominated by Episominella umbonifera and is associated with cold (Theta = -0.3 to 0.8°C), low salinity (34.66 to 34.72 * 10**-3) Antarctic Bottom Water in the Crozet Basin, in fracture zones, and on the flanks of the Southwest Indian Ridge. A second assemblage, dominated by Planulina wuellerstorfi, Globocassidulina subglobasa, Astrononion echolsi and Pullenia bulloides, is between 1600 and 3800 m on the Crozet Plateau, Madagascar Ridge, Central Indian Ridge, and Southwest Indian Ridge and is associated with relatively warm (Theta = 0.8 to 2.6°C), high salinity (34.72 to 34.76 * 10**-3) North Atlantic Deep Water. The third principal component divides the P. wuellerstorfi assemblage into two subgroups. One is dominated by Epistominella exigua, P. bulloides, P. wuellerstorfi, and A. echolsi and a second is dominated by G. subglobosa. The distribution of the E. umbonifera assemblage and previous hydrographic studies suggest that AABW flows as a western boundary contour current in the Crozet Basin and penetrates fracture zones in the Southwest Indian Ridge between 55 and 57°E and near 66°E as it travels northward into the Madagascar and Mascarene basins.
The faunal-water mass associations from the southeast Indian Ocean are compared; the most notable faunal difference is the absence of Uvigerina as a dominant taxon in the southwest Indian Ocean. A comparison of dissolved oxygen and Uvigerina data shows that oxygen is not a major influence upon the distribution of Uvigerina.
A correlation analysis of the faunal data and water depth, potential temperature, in situ temperature, salinity, dissolved oxygen, and 1 - Omega, an index of calcium carbonate undersaturation, was carried out to determine the relationships between fauna and hydrography. The second principal component has a significant positive correlation at the 99.9% level with temperature and negative correlations with water depth and 1 - Omega. A general faunal-water mass correlation exists, but it is not possible to determine which variable controls the faunal distributions.
Coverage:
Median Latitude: -30.538913 * Median Longitude: 58.773578 * South-bound Latitude: -45.660000 * West-bound Longitude: 45.650000 * North-bound Latitude: -16.360000 * East-bound Longitude: 73.883000
Date/Time Start: 1960-01-08T00:00:00 * Date/Time End: 1974-05-07T00:00:00
Event(s):
AII15-765 * Latitude: -32.016700 * Longitude: 49.933300 * Elevation: -3698.0 m * Location: Indian Ocean * Method/Device: Gravity corer (GC)
AII15-766 * Latitude: -32.000000 * Longitude: 55.116700 * Elevation: -4417.0 m * Location: Indian Ocean * Method/Device: Gravity corer (GC)
DODO-131 * Latitude: -30.300000 * Longitude: 63.583300 * Elevation: -4392.0 m * Location: Indian Ocean * Campaign: DODO * Basis: Argo * Method/Device: Gravity corer (GC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Corliss, BH (1983): (Table 3) Benthic foraminifera in Southwest Indian Ocean surface sediments. https://doi.org/10.1594/PANGAEA.777970
  2. Corliss, BH (1983): (Table 5) Principal factor loadings for benthic foraminifera in Southwest Indian Ocean surface sediments. https://doi.org/10.1594/PANGAEA.777973
  3. Corliss, BH (1983): (Table 4) Scaled principal factor scores for benthic foraminifera in Southwest Indian Ocean surface sediments. https://doi.org/10.1594/PANGAEA.777971