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Dietrich, Volker; Carman, M F; Wyttenbach, A; McKee, E H (1984): Geochemistry of basalts at DSDP Leg 73 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.811113, Supplement to: Dietrich, V et al. (1984): Geochemistry of basalts from Holes 519A, 520, 522B, and 524, Deep Sea Drilling Project Leg 73 (South Atlantic). In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 579-601, https://doi.org/10.2973/dsdp.proc.73.121.1984

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Abstract:
During Deep Sea Drilling Project Leg 73 (South Atlantic), basaltic pillow lava, flows, and sills were encountered in Holes 519A, 520, 522B, and 524. Paleomagnetic data indicate that the basalts from Holes 519A (magnetic Anomaly 51) and 522B (Anomaly 16) have ages of about 12 m.y. and about 38 m.y., respectively.
The major- and trace- (including rare-earth-) element characteristics of the Hole 519A basalts (a total of 27 m) demonstrate that these basalts are typical normal-type mid-ocean-ridge basalts (N-type MORB). In composition the basalts overlap olivine tholeiites from other normal Mid-Atlantic Ridge segments. Both the spectra of incompatible, or less-hygromagmatophile elements (such as Ti, V, Y, and Zr) and REE abundances indicate that these basalts are the result of a low-pressure fractionation of olivine, spinel, and Plagioclase prior to eruption.
In Hole 520 only 1.7 m of basalt were recovered from a total drilling depth of 10.5 m. These pillow basalts crystallized from fairly evolved (N-type MORB) tholeiitic melts.
In total, 19 m of basaltic pillow lavas and flows were penetrated in Hole 522B. Thirteen cooling units were distinguished on the basis of glassy margins and fine quench textures. In contrast to Holes 519A and 520, the basalts of the Hole 522B ridge section can be divided into two major groups of tholeiites: (1) Cooling Units 1 through 12 and (2) Cooling Unit 13. The basalts in this ridge section are also N-type MORBs but are generally more differentiated than those of Holes 519A and 520. The lowermost basalts (Cooling Unit 13) have the most primitive composition and make up a compositional group distinct from the more evolved basalts in the twelve units above it.
Hole 524 was drilled on the south flank of the Walvis Ridge and thus provided samples from a more complex part of the South Atlantic seafloor. Three different basaltic rock suites, interlayered with volcanic detrital sediments, were encountered. The rock suites are, from top to bottom, an alkali basaltic pillow lava; a 16-m-thick alkaline diabase sill with an age of about 65 m.y. (according to K-Ar dating and planktonic foraminifers); and a second sill that is approximately 9 m thick, about 74 m.y. in age, and tholeiitic in composition, thus contrasting strongly with the overlying alkaline rocks.
The alkali basalts of Hole 524 show chemical characteristics that are very similar to the basaltic lavas of the Tristan da Cunha group volcanoes, which are located approximately 400 km east of the Mid-Atlantic Ridge crest. Thus, the Walvis Ridge may plausibly be interpreted as a line of hot-spot alkaline volcanoes.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -27.550031 * Median Longitude: -3.510035 * South-bound Latitude: -29.484200 * West-bound Longitude: -11.666200 * North-bound Latitude: -25.523300 * East-bound Longitude: 3.512300
Date/Time Start: 1980-04-22T00:00:00 * Date/Time End: 1980-05-21T00:00:00
Event(s):
73-519A * Latitude: -26.136700 * Longitude: -11.666200 * Date/Time: 1980-04-22T00:00:00 * Elevation: -3769.0 m * Penetration: 180 m * Recovery: 61.4 m * Location: South Atlantic/RIDGE * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 84.5 m cored; 0 m drilled; 72.7 % recovery
73-520 * Latitude: -25.523300 * Longitude: -11.185700 * Date/Time: 1980-04-28T00:00:00 * Elevation: -4207.0 m * Penetration: 456.5 m * Recovery: 69 m * Location: South Atlantic/VALLEY * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 249 m cored; 15.5 m drilled; 27.7 % recovery
73-522B * Latitude: -26.114000 * Longitude: -5.129700 * Date/Time: 1980-05-06T00:00:00 * Elevation: -4441.0 m * Penetration: 170.4 m * Recovery: 26 m * Location: South Atlantic/PLATEAU * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 40.5 m cored; 0 m drilled; 64.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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13 datasets

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Datasets listed in this publication series

  1. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 2) Major- and trace-element abundances of basalts at DSDP Hole 73-519A. https://doi.org/10.1594/PANGAEA.811100
  2. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 4) Normative mineralogy of basalts at DSDP Hole 73-519A. https://doi.org/10.1594/PANGAEA.811102
  3. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 5) Major- and trace-elements of basalts at DSDP Hole 73-520. https://doi.org/10.1594/PANGAEA.811103
  4. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 6) Normative mineralogy of basalts at DSDP Hole 73-520. https://doi.org/10.1594/PANGAEA.811104
  5. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 7) Major- and trace-elements of basalts at DSDP Hole 73-522B. https://doi.org/10.1594/PANGAEA.811105
  6. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 8) Normative mineralogy of basalts at DSDP Hole 73-522B. https://doi.org/10.1594/PANGAEA.811106
  7. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 9) Major- and trace-elements of basalts from lower part of DSDP Hole 73-524. https://doi.org/10.1594/PANGAEA.811107
  8. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 11) Major- and trace-elements of volcanic sedimentary layers in DSDP Hole 73-524. https://doi.org/10.1594/PANGAEA.811109
  9. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 12) Major- and trace-elements of basalts from upper part of DSDP Hole 73-524. https://doi.org/10.1594/PANGAEA.811111
  10. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 10) Normative mineralogy of basalts from lower part of DSDP Hole 73-524. https://doi.org/10.1594/PANGAEA.811108
  11. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 13) Normative mineralogy of basalts from upper part of DSDP Hole 73-524. https://doi.org/10.1594/PANGAEA.811112
  12. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 1) K-Ar age at DSDP Leg 73 Holes basalts. https://doi.org/10.1594/PANGAEA.811099
  13. Dietrich, V; Carman, MF; Wyttenbach, A et al. (1984): (Table 3) Rare-earth-elements of basalts at DSDP Leg 73 Holes. https://doi.org/10.1594/PANGAEA.811101