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Nigrini, Catherine A (1991): Radiolarian assemblages of ODP Leg 117 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.728420, Supplement to: Nigrini, CA (1991): Composition and biostratigraphy of radiolarian assemblages from an area of upwelling (northwestern Arabian Sea, Leg 117). In: Prell, WL; Niitsuma, N; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 117, 89-126, https://doi.org/10.2973/odp.proc.sr.117.132.1991

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Abstract:
Significant numbers of radiolarians ranging in age from late middle Miocene to Recent were recovered from six sites drilled on the Oman margin and Owen Ridge. Sparse faunas were recovered from five additional sites on the Oman margin and one site on the Indus Fan. Detailed range charts and biozonations are presented for most sites. The radiolarian assemblages are peculiar in that numerous common tropical forms, some of which are biomarkers, are absent or very rare. In addition, some species not usually found in tropical assemblages are present. These forms, indicative of up welling conditions, fall into three categories: (1) endemic upwelling: species endemic to upwelling and not previously described from the Indian Ocean; (2) displaced temperate: temperate forms not usually found in tropical waters; and (3) enhanced tropical: tropical forms which are more abundant and/or robust in areas of upwelling. Comparison of the Oman margin/Owen Ridge fauna with that recovered from the Peru margin upwelling area (ODP Leg 112) suggests that the assemblage may be globally diagnostic of upwelling conditions.
The onset of upwelling is marked by the appearance of siliceous biota at about 11.9 Ma, and there is some indication of a decrease in the strength of the upwelling signal at about 9.6 Ma. A strong pulse in, or strengthening of, the upwelling mechanism is indicated by a marked fauna change at 4.7 Ma. There is a weaker signal, implying a change in upwelling conditions, at about 1.5 Ma.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 17.232453 * Median Longitude: 58.799406 * South-bound Latitude: 16.470500 * West-bound Longitude: 57.371500 * North-bound Latitude: 18.487300 * East-bound Longitude: 59.864500
Date/Time Start: 1987-09-03T12:00:00 * Date/Time End: 1987-10-04T00:45:00
Event(s):
117-721A * Latitude: 16.677800 * Longitude: 59.864500 * Date/Time Start: 1987-09-03T12:00:00 * Date/Time End: 1987-09-03T23:30:00 * Elevation: -1952.0 m * Penetration: 86.4 m * Recovery: 89.28 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 86.4 m cored; 0 m drilled; 103.3 % recovery
117-721B * Latitude: 16.677800 * Longitude: 59.864500 * Date/Time Start: 1987-09-03T23:30:00 * Date/Time End: 1987-09-06T01:45:00 * Elevation: -1948.0 m * Penetration: 424.2 m * Recovery: 342.78 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 424.2 m cored; 0 m drilled; 80.8 % recovery
117-722A * Latitude: 16.621800 * Longitude: 59.795300 * Date/Time Start: 1987-09-07T02:30:00 * Date/Time End: 1987-09-08T12:00:00 * Elevation: -2034.0 m * Penetration: 280 m * Recovery: 225.98 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 280 m cored; 0 m drilled; 80.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
17 datasets

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Datasets listed in this publication series

  1. Nigrini, CA (1991): (Appendix A, Table 13) Radiolarian events of ODP Site 117-721. https://doi.org/10.1594/PANGAEA.728414
  2. Nigrini, CA (1991): (Appendix A, Table 1) Occurrence of stratigraphically important radiolaria species in ODP Site 117-721. https://doi.org/10.1594/PANGAEA.728399
  3. Nigrini, CA (1991): (Appendix A, Table 10) Occurrence of stratigraphically important radiolaria species in ODP Site 117-721. https://doi.org/10.1594/PANGAEA.728410
  4. Nigrini, CA (1991): (Appendix A, Table 14) Radiolarian events of ODP Site 117-722. https://doi.org/10.1594/PANGAEA.728416
  5. Nigrini, CA (1991): (Appendix A, Table 2) Occurrence of stratigraphically important radiolaria species in ODP Site 117-722. https://doi.org/10.1594/PANGAEA.728400
  6. Nigrini, CA (1991): (Appendix A, Table 11) Occurrence of stratigraphically important radiolaria species in ODP Site 117-722. https://doi.org/10.1594/PANGAEA.728411
  7. Nigrini, CA (1991): (Appendix A, Table 3) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-723A. https://doi.org/10.1594/PANGAEA.728401
  8. Nigrini, CA (1991): (Appendix A, Table 4) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-724B. https://doi.org/10.1594/PANGAEA.728404
  9. Nigrini, CA (1991): (Appendix A, Table 5) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-725C. https://doi.org/10.1594/PANGAEA.728405
  10. Nigrini, CA (1991): (Appendix A, Table 6) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-726A. https://doi.org/10.1594/PANGAEA.728406
  11. Nigrini, CA (1991): (Appendix A, Table 15) Radiolarian events of ODP Hole 117-728A. https://doi.org/10.1594/PANGAEA.728417
  12. Nigrini, CA (1991): (Appendix A, Table 7) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-728A. https://doi.org/10.1594/PANGAEA.728407
  13. Nigrini, CA (1991): (Appendix A, Table 16) Radiolarian events of ODP Hole 117-730A. https://doi.org/10.1594/PANGAEA.728418
  14. Nigrini, CA (1991): (Appendix A, Table 8) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-730A. https://doi.org/10.1594/PANGAEA.728408
  15. Nigrini, CA (1991): (Appendix A, Table 17) Radiolarian events of ODP Hole 117-731A. https://doi.org/10.1594/PANGAEA.728419
  16. Nigrini, CA (1991): (Appendix A, Table 9) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-731A. https://doi.org/10.1594/PANGAEA.728409
  17. Nigrini, CA (1991): (Appendix A, Table 12) Occurrence of stratigraphically important radiolaria species in ODP Hole 117-731A. https://doi.org/10.1594/PANGAEA.728412