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Thompson, Geoffrey; Bryan, Wilfred B; Frey, Frederick A; Dickey, John S; Davies, Hugh L (1982): Basalt analyses from different DSDP Holes in the Mozambique Basin and Ridge and from the Southwest Indian Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.761503, Supplement to: Thompson, G et al. (1982): Petrology, geochemistry and original tectonic setting of basalts from the Mozambique Basin and Ridge (DSDP Sites 248, 249 and 250), and from the Southwest Indian Ridge (DSDP Site 251). Marine Geology, 48(3-4), 175-195, https://doi.org/10.1016/0025-3227(82)90096-2

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Abstract:
Basalts from DSDP Sites 248, 249, 250 and 251 in the southwestern Indian Ocean formed in a complex tectonic region affected by the separation of Africa and South America. The different ages and variable geochemical features of these DSDP basalts probably reflect this tectonic complexity. For example, Site 251 on the flanks of the Southwest Indian Ridge is represented by normal MORB which probably originated at the Southwest Indian Ridge. Site 250 in the Mozambique Basin includes an older incompatible- element enriched unit which may represent basalt associated with the Prince Edward Fracture Zone; the upper unit is normal MORB. Basalts at Site 248 also in the Mozambique Basin are geochemically very unlike MORB and have strong continental affinities; they are also comparable in age to some of the continental Karroo basalts. They appear to be related to a subcontinental mantle source or to contamination by continental basement associated with the tectonic elevation of the Mozambique Ridge. Basalts from Site 249 on the Mozambique Ridge are relatively weathered but appear to be normal MORB. Their age, location, and composition are consistent with their origin at an early Cretaceous rift which has been postulated to have separated the Falkland Plateau from the Mozambique Ridge.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -32.073000 * Median Longitude: 39.875100 * South-bound Latitude: -36.504200 * West-bound Longitude: 36.077000 * North-bound Latitude: -29.529700 * East-bound Longitude: 49.485800
Date/Time Start: 1972-08-14T00:00:00 * Date/Time End: 1972-09-17T00:00:00
Event(s):
25-248 * Latitude: -29.529700 * Longitude: 37.474700 * Date/Time: 1972-08-14T00:00:00 * Elevation: -4994.0 m * Penetration: 434 m * Recovery: 40.8 m * Location: Indian Ocean//BASIN * Campaign: Leg25 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 108 m cored; 28 m drilled; 37.8 % recovery
25-249 * Latitude: -29.949800 * Longitude: 36.077000 * Date/Time: 1972-08-18T00:00:00 * Elevation: -2098.0 m * Penetration: 412 m * Recovery: 221.4 m * Location: Indian Ocean//RIDGE * Campaign: Leg25 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 285 m cored; 0 m drilled; 77.7 % recovery
26-250 * Latitude: -33.462300 * Longitude: 39.369200 * Date/Time: 1972-09-08T00:00:00 * Elevation: -5119.0 m * Penetration: 65 m * Recovery: 21.3 m * Location: Indian Ocean//BASIN * Campaign: Leg26 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 28 m cored; 0 m drilled; 76.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 1) Modal analyses of basalt from DSDP Hole 25-248. https://doi.org/10.1594/PANGAEA.761495
  2. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 2) Major element and trace-element analyses of basalt from DSDP Hole 25-248. https://doi.org/10.1594/PANGAEA.761496
  3. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 5) Major and trace element analyses of basalt from DSDP Hole 25-249. https://doi.org/10.1594/PANGAEA.761501
  4. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 3) Clinopyroxene and plagioclase analyses from DSDP Hole 26-250. https://doi.org/10.1594/PANGAEA.761497
  5. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 4) Major and trace element analyses of basalt from DSDP Hole 26-250. https://doi.org/10.1594/PANGAEA.761500
  6. Thompson, G; Bryan, WB; Frey, FA et al. (1982): (Table 6) Major and trace element analyses of basalt from DSDP Hole 26-251. https://doi.org/10.1594/PANGAEA.761502