The basalts recovered during Legs 183 and 120 from the southern, central, and northernmost parts of the Kerguelen Plateau (Holes 1136A, 1138A, 1140A, and 747C, respectively), as well as those recovered from the eastern part of the crest of Elan Bank (Hole 1137A), represent derivates from tholeiitic melts. In the northern part of the Kerguelen Plateau (Hole 1140A), basalts may have formed from two sources located at different depths. This is reflected in the presence of both low- and high-titanium basalts. The basalts are variably altered by low-temperature hydrothermal processes (at temperatures up to 120°C), and some are affected by subaerial weathering. The hydrothermal alteration led mainly to the formation of smectites, chlorite minerals, mixed-layer hydromica-smectite and smectite-chlorite minerals, hydromica, serpentine(?), clinoptilolite, heulandite, stilbite, analcime, mordenite, thomsonite, natrolite(?), calcite, quartz, and dickite(?). Alteration of extrusive basalts is mainly related to horizontal fluid flow within permeable contact zones between lava flows. Under a nonoxidizing environment of alteration, the tendency to lose most of elements, including rare earth elements, from basalts dominates. Under on oxidizing environment, basalts accumulate many elements.

Data tables T7-T10, T12 and T13 have been published with Kurnosov et al. (2008, doi:10.1594/PANGAEA.729497). The data can be found with the following links: Data on Hole 183-1136A: doi:10.1594/PANGAEA.729750, doi:10.1594/PANGAEA.729213 and doi:10.1594/PANGAEA.729214; on Hole 183-1137A: doi:10.1594/PANGAEA.729751, doi:10.1594/PANGAEA.729217 and doi:10.1594/PANGAEA.729218; on Hole 183-1138A: doi:10.1594/PANGAEA.729752, doi:10.1594/PANGAEA.729219 and doi:10.1594/PANGAEA.729220; on Hole 183-1140A: doi:10.1594/PANGAEA.729753, doi:10.1594/PANGAEA.729221 and doi:10.1594/PANGAEA.729223; on Hole 120-747C: doi:10.1594/PANGAEA.729749, doi:10.1594/PANGAEA.729225 and doi:10.1594/PANGAEA.729226.

Supplement to: Kurnosov, Victor B; Zolotarev, Boris P; Artamonov, Andrey V; Garanina, Svetlana A; Petrova, V; Eroshchev-Shak, Vadim A; Sokolova, Alla L (2003): Data report: Alteration of basalts from the Kerguelen Plateau. In: Frey, FA; Coffin, MF; Wallace, PJ; Quilty, PG (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 183, 1-40