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Gillis, Kathryn M; Ludden, John N; Plank, Terry; Hoy, Lawrence D (1992): Chemistry of altered basalts from ODP Hole 123-765D [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.760896, Supplement to: Gillis, KM et al. (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, https://doi.org/10.2973/odp.proc.sr.123.157.1992

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Abstract:
Volcanic basement recovered at Hole 765D is characterized by nonpervasive, oxidative alteration, typical of seafloor weathering. Chilled margins and the mesostasis of the lavas are variably altered to assemblages of celadonite, Fe-oxyhydroxides, zeolites, and calcite with trace saponite. Plagioclase is partially altered to Ca-Na zeolites and/or albite. Well-developed alteration halos parallel fracture surfaces and extend several centimeters into the surrounding rock. These clay-rich halos are enriched in K2O and Fe2O3 relative to the adjacent clay-poor rock. The halos and adjacent rock are characterized by d18O values 2 per mil-3 per mil higher than those of fresh MORB. The "freshness" of the samples and the scarcity of saponite suggest that the duration of seawater circulation was short-lived. Albitization of plagioclase indicates that the volcanic rocks were altered initially at low temperatures and were subsequently reheated off-axis in a closed environment. Reheating did not result in significant modification of the bulk composition of the crust.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -15.976000 * Longitude: 117.575200
Date/Time Start: 1988-09-22T10:30:00 * Date/Time End: 1988-10-18T00:00:00
Event(s):
123-765D * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-22T10:30:00 * Date/Time End: 1988-10-18T00:00:00 * Elevation: -5724.0 m * Penetration: 1194.9 m * Recovery: 78.7 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 247 m cored; 0 m drilled; 31.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Gillis, KM; Ludden, JN; Plank, T et al. (1992): (Table 4) Distribution of alteration halos in ODP Hole 123-765D. https://doi.org/10.1594/PANGAEA.760893
  2. Gillis, KM; Ludden, JN; Plank, T et al. (1992): (Table 5) Major and trace element composition of representative alteration halos and adjacent groundmass of ODP Hole 123-765D. https://doi.org/10.1594/PANGAEA.760895
  3. Gillis, KM; Ludden, JN; Plank, T et al. (1992): (Table 2) Calcite analyses of ODP Hole 123-765D. https://doi.org/10.1594/PANGAEA.760889
  4. Gillis, KM; Ludden, JN; Plank, T et al. (1992): (Table 1) Clay mineral analyses of ODP Hole 123-765D. https://doi.org/10.1594/PANGAEA.760888
  5. Gillis, KM; Ludden, JN; Plank, T et al. (1992): (Table 3) Analyses of plagioclase and its alteration products of ODP Hole 123-765D. https://doi.org/10.1594/PANGAEA.760890