Proust, D; Meunier, A; Fouillac, A M; Dudoignon, P; Sturz, Anne Aleda; Charvet, Jacques; Scott, Steven D (1992): (Table 2) Mineralogy and carbon, oxygen, and hydrogen isotope ratios for secondary mineral samples from igneous rocks from ODP Hole 128-794D [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.777247, Supplement to: Proust, D et al. (1992): Preliminary results on the mineralogy and geochemistry of basalt alteration, Hole 794D. In: Tamaki, K; Suychiro, K; Allan, J; McWilliams, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(2), 883-889, https://doi.org/10.2973/odp.proc.sr.127128-2.205.1992
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Abstract:
The basaltic rocks of Hole 794D drilled during Leg 128 are strongly altered. Microprobe analyses and XRD spectra on small quantities of matter extracted from thin sections show that primary minerals and glassy zones of the groundmass are totally or partially replaced by clay minerals with chlorite/saponite mixed-layer composition whatever the rock sample considered. This mixed-layer was also identified in veins and vesicles where it crystallizes in spheroidal aggregates. The largest veins and vesicles are filled by a zoned deposit: the chlorite/saponite mixed-layer always occupies the central part and is rimmed by pure saponite. Calcite crystallizes in secondary fractures which crosscut the clayey veins and vesicles.
Chemographic analysis based on the M+-4Si-3R2+ projection shows that the chemical composition of the saponite component in the mixed-layer is identical to that of the free saponite. This indicates that the clay mineral crystallization was controlled by the chemical composition of the alteration fluids. From petrographic evidence, it is suggested that both chlorite/saponite mixed-layer and free saponite belong to the same hydrothermal event and are produced by a temperature decrease. This is supported by the stable isotopic data.
The isotopic data show very little variation: d18O saponite ranges from 13.1 per mil to 13.5 per mil, and dD saponite from -73.6 per mil to -70.0 per mil. d18O calcite varies from +19.7 per mil to +21.9 per mil vs SMOW and d13C from -3.2 per mil to +0.4 per mil vs. PDB. These values are consistent with seawater alteration of the basalt. The formation of saponite took place at 150°-180°C and the formation of calcite at about 65°C.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 40.189400 * Longitude: 138.232400
Date/Time Start: 1989-09-22T13:48:00 * Date/Time End: 1989-09-29T23:00:00
Minimum Elevation: -2818.0 m * Maximum Elevation: -2818.0 m
Event(s):
128-794D * Latitude: 40.189400 * Longitude: 138.232400 * Date/Time Start: 1989-09-22T13:48:00 * Date/Time End: 1989-09-29T23:00:00 * Elevation: -2818.0 m * Penetration: 733.5 m * Recovery: 34.85 m * Location: Japan Sea * Campaign: Leg128 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 160.5 m cored; 0 m drilled; 21.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Proust, D | DSDP/ODP/IODP sample designation | ||
| 2 | Description | Description | Proust, D | Mass spectrometer Finnigan Delta-E | ||
| 3 | δ18O | δ18O | ‰ | Proust, D | Mass spectrometer Finnigan Delta-E | with respect to SMOW, secondary carbonate minerals |
| 4 | δ18O | δ18O | ‰ | Proust, D | Mass spectrometer Finnigan Delta-E | with respect to PDB, secondary carbonate minerals |
| 5 | δ13C | δ13C | ‰ PDB | Proust, D | Mass spectrometer Finnigan Delta-E | with respect to PDB, secondary carbonate minerals |
| 6 | δ18O | δ18O | ‰ | Proust, D | Mass spectrometer Finnigan Delta-E | with respect to SMOW, clay minerals |
| 7 | δ Deuterium | δD | ‰ SMOW | Proust, D | Mass spectrometer Finnigan Delta-E | clay minerals |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
26 data points