Weis, D; Frey, Frederick A; Saunders, A; Gibson, Ian L (1991): Chemical composition of basement rocks from ODP Leg 121, Ninetyeast Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.711816, Supplement to: Weis, D et al. (1991): Ninetyeast Ridge (Indian Ocean): A 5000 km record of a Dupal mantle plume. Geology, 19(2), 99-102, https://doi.org/10.1130/0091-7613(1991)019%3C0099:NRIOAK%3E2.3.CO;2
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Abstract:
Data and observation from Drifting Program Leg 121 and plate-tectonic reconstructions indicate that the Ninetyeast Ridge (Indian Ocean) was derived from the interaction of a deep-seated Dupal hotspot and a nearby spreading-ridge axis. The 5000-km-long ridge, from lat 34°S to lat 10°N, was drilled at three sites during Leg 121. About 178 m of basalt, >38 to >80 Ma, were recovered from a total penetration of ~310 m. Shipboard petrographic and geochemical studies showed that each site has distinctive characteristics. Most of the cored lavas have a tholeiitic basalt composition. Incompatible-element abundanes and ratios show systematic trends, consistent with an origin for the Ninetyeast Ridge lavas by mixing between a depleted component-Indian Ocean mid-ocean ridge basalt-and an enriched component-oceanic-island basalt similar to that observed in the youngest alkalic basalts from the Kerguelen archipelago. Preliminary shore-based trace element abundance and isotopic data are compatible with this hypothesis, although Pb isotopes indicate the involvement of another component.
The long-lasting and more or less continuous activity of the Kerguelen-Heard plume (ca. 115 Ma), now located under Heard Island, south of the Southeast Indian Ridge, provides evidence that the source of the Dupal anomaly is deep seated.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -12.997933 * Median Longitude: 88.712933 * South-bound Latitude: -27.355000 * West-bound Longitude: 87.597400 * North-bound Latitude: 5.384200 * East-bound Longitude: 90.361200
Date/Time Start: 1988-05-27T18:45:00 * Date/Time End: 1988-06-24T13:30:00
Event(s):
121-756D * Latitude: -27.355000 * Longitude: 87.597400 * Date/Time Start: 1988-05-27T18:45:00 * Date/Time End: 1988-05-29T10:30:00 * Elevation: -1524.0 m * Penetration: 221 m * Recovery: 46.04 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 101.2 m cored; 0 m drilled; 45.5 % recovery
121-757C * Latitude: -17.023000 * Longitude: 88.180200 * Date/Time Start: 1988-06-04T06:15:00 * Date/Time End: 1988-06-05T18:10:00 * Elevation: -1655.0 m * Penetration: 420.7 m * Recovery: 67.78 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 106.1 m cored; 0 m drilled; 63.9 % recovery
121-758A * Latitude: 5.384200 * Longitude: 90.361200 * Date/Time Start: 1988-06-15T23:50:00 * Date/Time End: 1988-06-24T13:30:00 * Elevation: -2935.0 m * Penetration: 676.8 m * Recovery: 453.83 m * Location: Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 73 cores; 676.8 m cored; 0 m drilled; 67.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Weis, D; Frey, FA; Saunders, A et al. (1991): (Table 1) Chemical composition of basement rocks from ODP Hole 121-756D. https://doi.org/10.1594/PANGAEA.711813
- Weis, D; Frey, FA; Saunders, A et al. (1991): (Table 1) Chemical composition of basement rocks from ODP Hole 121-757C. https://doi.org/10.1594/PANGAEA.711814
- Weis, D; Frey, FA; Saunders, A et al. (1991): (Table 1) Chemical composition of basement rocks from ODP Hole 121-758A. https://doi.org/10.1594/PANGAEA.711815