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Thompson, Geoffrey; Humphris, Susan E (1984): Major and trace elements at DSDP Leg 74 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810632, Supplement to: Thompson, G; Humphris, SE (1984): Petrology and geochemistry of rocks from the Walvis Ridge: Deep Sea Drilling Project Leg 74, Sites 525, 527 and 528. In: Moore, TC Jr; Rabinowitz, PD; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 74, 755-764, https://doi.org/10.2973/dsdp.proc.74.126.1984

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Abstract:
Deep Sea Drilling Project Leg 74 drilled basement on the Walvis Ridge at Sites 525, 527, and 528. These sites are located on the crest and flanks of the segment of the Ridge about 68 to 70 m.y. old in the central province of the Ridge. Each site has a number of distinct subaqueous flows separated by sediment layers. Although variation in geochemistry among units and sites is related in part to alteration or crystal fractionation, some is caused by small-scale compositional variation in the mantle source of the basalts.
Leg 74 basalts are similar to other basalts recovered from the Walvis Ridge and the Rio Grande Rise. They show distinct compositional differences to mid-ocean ridge basalts in general, to those recovered from the South Atlantic at this latitude, and to basalts presently erupting in Tristan da Cunha. The composition of the Walvis Ridge basalts does not suggest simple mixtures of present-day MORB and Tristan da Cunha melts. If the Walvis Ridge represents the trace of the Tristan da Cunha hot spot as the plates separated, then the composition of the mantle source has differed at different times in the past, which suggests mantle heterogeneity.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -28.546859 * Median Longitude: 2.359450 * South-bound Latitude: -29.070700 * West-bound Longitude: 1.763300 * North-bound Latitude: -28.041500 * East-bound Longitude: 2.985300
Date/Time Start: 1980-06-10T00:00:00 * Date/Time End: 1980-07-04T00:00:00
Event(s):
74-525 * Latitude: -29.070700 * Longitude: 2.985300 * Date/Time: 1980-06-10T00:00:00 * Elevation: -2467.0 m * Penetration: 3.6 m * Recovery: 3.6 m * Location: South Atlantic/CREST * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 cores; 3.6 m cored; 0 m drilled; 99.7 % recovery
74-525A * Latitude: -29.070700 * Longitude: 2.985300 * Date/Time: 1980-06-10T00:00:00 * Elevation: -2467.0 m * Penetration: 678.1 m * Recovery: 406.6 m * Location: South Atlantic/CREST * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 549.7 m cored; 6 m drilled; 74 % recovery
74-527 * Latitude: -28.041500 * Longitude: 1.763300 * Date/Time: 1980-06-28T00:00:00 * Elevation: -4428.0 m * Penetration: 384.5 m * Recovery: 243.4 m * Location: South Atlantic Ocean * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 380 m cored; 4.5 m drilled; 64.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Thompson, G; Humphris, SE (1984): (Table 2) Major elements of basalts at DSDP Hole 74-525A (on a volatile-free basis after ignition at 1000 deg C). https://doi.org/10.1594/PANGAEA.810626
  2. Thompson, G; Humphris, SE (1984): (Table 3) Trace elements of basalts at DSDP Hole 74-525A (on a dried, 110 deg C basis). https://doi.org/10.1594/PANGAEA.810627
  3. Thompson, G; Humphris, SE (1984): (Table 4) Major elements of basalts at DSDP Hole 74-527 (on a volatile-free basis after ignition at 1000 deg C). https://doi.org/10.1594/PANGAEA.810628
  4. Thompson, G; Humphris, SE (1984): (Table 5) Trace elements of basalts at DSDP Hole 74-527 (on a dried, 110 deg C basis). https://doi.org/10.1594/PANGAEA.810629
  5. Thompson, G; Humphris, SE (1984): (Table 6) Major elements of basalts at DSDP Hole 74-528 (on a volatile-free basis after ignition at 1000 deg C). https://doi.org/10.1594/PANGAEA.810630
  6. Thompson, G; Humphris, SE (1984): (Table 7) Trace elements of basalts at DSDP Hole 74-528 (on a dried, 110 deg C basis). https://doi.org/10.1594/PANGAEA.810631
  7. Thompson, G; Humphris, SE (1984): (Table 1) Sediment descriptions at DSDP Leg 74 Holes. https://doi.org/10.1594/PANGAEA.810625