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Bitschene, Peter Rene; Holmes, Mary Anne; Breza, James R (1992): Chemistry of bulk-rocks and minerals of ODP Hole 120-748C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758566, Supplement to: Bitschene, PR et al. (1992): Composition and origin of Cr-rich glauconitic sediments from the southern Kerguelen Plateau (Site 748). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 113-134, https://doi.org/10.2973/odp.proc.sr.120.133.1992

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Abstract:
Five hundred meters of a unique Upper Cretaceous Cr-rich glauconitic sequence (Unit III) that overlies a 3-m-thick alkali-basalt flow with underlying epiclastic volcanogenic sediments was drilled at ODP Leg 120 Site 748. The Cr-rich glauconitic sequence is lithostratigraphically and biostratigraphically divided into three subunits (IIIA, IIIB, IIIC) that can also be recognized by the Cr concentration of the bulk sediment, which is low (<200 ppm) in Subunits IIIC and IIIA and high (400-800 ppm) in Subunit IIIB. The Cr enrichment is caused by Cr-spinel, which is the only significant heavy mineral component beside Fe-Ti ores. Other Cr-bearing components are glauconite pellets and possibly some other clay minerals.
The glauconitic sequence of Subunit IIIB was formed by reworking of glauconite and volcanogenic components that were transported restricted distances and redeposited downslope by mass-transportation processes. The site of formation was a nearshore, shallow inner shelf environment, and final deposition may have been on the outer part of a narrow shelf, at the slope toward the restricted, probably synsedimentary, faulted Raggatt Basin.
The volcanic edifices uncovered on land were tholeiitic basalts (T-MORB), alkali-basaltic (OIB) and (?)silicic volcanic complexes, and ultramafic rocks. The latter were the ultimate source for the Cr-spinel contribution. Terrestrial aqueous solutions carried Fe, K, Cr, Si, and probably Al into the marine environment, where, depending on the redox conditions of microenvironments in the sediment, green (Fe- and K-rich) or brown (Al-rich) glauconite pellets formed.
The Upper Cretaceous glauconitic sequence at Site 748 on the Southern Kerguelen Plateau constitutes the transition in space and time from terrestrial to marine, from magmatically active subaerial to magmatically passive submarine conditions, and from a tranquil platform to active rifting conditions.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -58.441000 * Longitude: 78.998100
Date/Time Start: 1988-03-15T11:00:00 * Date/Time End: 1988-03-23T22:54:00
Event(s):
120-748C * Latitude: -58.441000 * Longitude: 78.998100 * Date/Time Start: 1988-03-15T11:00:00 * Date/Time End: 1988-03-23T22:54:00 * Elevation: -1301.0 m * Penetration: 935 m * Recovery: 185.88 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg120 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 87 cores; 760 m cored; 0 m drilled; 24.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 4) Bulk-rock chemistry of selected samples of ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758561
  2. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 8) Chemistry of neoformed carbonate minerals of ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758565
  3. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 1) Weight percentages of selected samples from lithologic Unit III "glauconite sequence" in ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758556
  4. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 5) Chemistry of discrete, varicolored glauconite pellets of ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758562
  5. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 3) Chemical composition of organic phosphate debris in ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758560
  6. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 7) Chemistry of quartz and feldspar grains of ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758564
  7. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 6) Chemistry of Cr-spinel and ilmenite/magnetite minerals of ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758563
  8. Bitschene, PR; Holmes, MA; Breza, JR (1992): (Table 2) Textural analyses of the sand fraction of selected samples from lithologic Unit III glauconite sequence in ODP Hole 120-748C. https://doi.org/10.1594/PANGAEA.758559