Ludden, John N; Dionne, B (1992): Geochemistry of basalts of the Indian Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.761025, Supplement to: Ludden, JN; Dionne, B (1992): The geochemistry of oceanic crust at the onset of rifting in the Indian Ocean. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 791-799, https://doi.org/10.2973/odp.proc.sr.123.161.1992
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Abstract:
Indian Ocean crust formed at Sites 765 and 766 is geochemically comparable to that presently forming in the Red Sea. In both cases, we interpret the crust as reflecting high degrees of mantle melting that are associated with an enhanced thermal gradient below recently rifted continental lithosphere. Asthenospheric melts formed in this environment are rich in CaO and FeO, poor in Na2O and Al2O3, and characterized by depleted rare earth element (REE) profiles ([La/Sm]n approximately 0.5-0.6). Both the Red Sea basalts and the basalts at Sites 765 and 766 are distinct from those erupted at the present Mid-Indian Ocean Ridge.
The isotope characteristics of the Site 765 basalts define a geochemical signature similar to that of the present-day Mid-Indian Ocean Ridge basalts (MIORB). The Indian Ocean mantle domain is distinct from that of the Atlantic and Pacific oceans, and this distinction has persisted since Jurassic time, when the Site 765 oceanic crust was formed.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -16.899067 * Median Longitude: 115.913610 * South-bound Latitude: -19.932000 * West-bound Longitude: 110.454100 * North-bound Latitude: -15.976000 * East-bound Longitude: 117.575200
Date/Time Start: 1988-09-11T04:25:00 * Date/Time End: 1988-10-26T00:00:00
Event(s):
123-765C * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-11T04:25:00 * Date/Time End: 1988-09-22T10:30:00 * Elevation: -5728.0 m * Penetration: 963.9 m * Recovery: 373.35 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 65 cores; 613.7 m cored; 0 m drilled; 60.8 % recovery
123-765D * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-22T10:30:00 * Date/Time End: 1988-10-18T00:00:00 * Elevation: -5724.0 m * Penetration: 1194.9 m * Recovery: 78.7 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 247 m cored; 0 m drilled; 31.9 % recovery
123-766A * Latitude: -19.932000 * Longitude: 110.454100 * Date/Time Start: 1988-10-19T20:45:00 * Date/Time End: 1988-10-26T00:00:00 * Elevation: -4008.0 m * Penetration: 527.2 m * Recovery: 347.49 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 527.2 m cored; 0 m drilled; 65.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Ludden, JN; Dionne, B (1992): (Table 2) Sr, Nd, and Pb isotope ratios of ODP Site 123-765 basalts. https://doi.org/10.1594/PANGAEA.761024
- Ludden, JN; Dionne, B (1992): (Table 1) Chemistry of ODP Leg 123 basalts. https://doi.org/10.1594/PANGAEA.761023