Shimmield, Graham; Mowbray, Stephen R (1991): Inorganic geochemical record of ODP Holes 117-722B and 117-724C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.756840, Supplement to: Shimmield, G; Mowbray, SR (1991): The inorganic geochemical record of the northwest Arabian Sea: a history of productivity variation over the last 400 k.y. from Sites 722 and 724. In: Prell, WL; Niitsuma, N; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 117, 409-429, https://doi.org/10.2973/odp.proc.sr.117.170.1991
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Abstract:
High-resolution sampling from late Pleistocene (last 400 k.y.) sediments of Site 722 (upper 16 m) and Site 724 (upper 70 m), and subsequent inorganic geochemical analysis, has defined the history of productivity in the northwest Arabian Sea. Eolian dust input from the Arabian Peninsula and Somalia is characterized by the record of Ti/Al and Cr/Al. This dust record displays strong precessional periodicity (cycles at 25 k.y.) suggesting the Southwest Monsoon and associated winds play a key role in transporting terrigenous material from the land. High biological productivity results in the accumulation of biogenic CaCO3 and opal in the sediments, the latter having an unexpectedly minor contribution to the total mass flux. Due to dilution of the CaCO3 record by the terrigenous component, the record of biological productivity is best exemplified by Ba. Its record, together with that of other metals recording biological association and redox variability (Cu, Ni, Zn, V, U) clearly identifies the interglacial episodes as being more biologically productive. The striking agreement between Ba and the d18O record in planktonic foraminifers suggests that the supply of nutrients during these periods of high productivity is linked to ocean-wide changes in ocean fertility, and not just local upwelling conditions. High levels of phosphate accumulation in interglacial sediments is attributed to both diagenetic phosphorite formation and biogenic skeletal debris. This study provides a detailed record of productivity variation in the northwest Arabian Sea during the late Pleistocene.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 17.235367 * Median Longitude: 59.125700 * South-bound Latitude: 16.621800 * West-bound Longitude: 57.786500 * North-bound Latitude: 18.462500 * East-bound Longitude: 59.795300
Date/Time Start: 1987-09-08T12:00:00 * Date/Time End: 1987-09-21T08:00:00
Event(s):
117-722B * Latitude: 16.621800 * Longitude: 59.795300 * Date/Time Start: 1987-09-08T12:00:00 * Date/Time End: 1987-09-13T10:15:00 * Elevation: -2033.0 m * Penetration: 565.6 m * Recovery: 385.8 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 59 cores; 565.1 m cored; 0 m drilled; 68.3 % recovery
117-724C * Latitude: 18.462500 * Longitude: 57.786500 * Date/Time Start: 1987-09-21T08:00:00 * Date/Time End: 1987-09-21T00:00:00 * Elevation: -603.0 m * Penetration: 252.4 m * Recovery: 242.7 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 252.4 m cored; 0 m drilled; 96.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Shimmield, G; Mowbray, SR (1991): (Appendix A) Major element concentrations in bulk samples of ODP Hole 117-722B. https://doi.org/10.1594/PANGAEA.756837
- Shimmield, G; Mowbray, SR (1991): (Appendix B) Minor element concentrations in bulk samples of ODP Hole 117-722B. https://doi.org/10.1594/PANGAEA.756838
- Shimmield, G; Mowbray, SR (1991): (Appendix C) Major element concentrations in bulk samples of ODP Hole 117-724C. https://doi.org/10.1594/PANGAEA.756839