Gieskes, Joris M; Kastner, Miriam; Warner, Theodore B (1975): (Table 1) Mineralogy of basal sediments from DSDP Hole 25-245 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.706873, Supplement to: Gieskes, JM et al. (1975): Evidence for extensive diagenesis, Madagascar Basin, Deep Sea Drilling Site 245. Geochimica et Cosmochimica Acta, 39(10), 1385-1393, https://doi.org/10.1016/0016-7037(75)90117-9
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Abstract:
Deep Sea Drilling Hole 245 (31°32'S, 52°18'E) in the southwest Indian Ocean shows pronounced linear concentration-depth gradients in interstitial dissolved Ca, Mg and Sr. Electrical conductivity tests enable us to make the estimate of a constant diffusion coefficient with depth of about 0.000002 cm**2/sec. The shapes of the concentration-depth gradients suggest that the major reaction sites in this hole are situated in the basal sediments and/or underlying basalts. It is proposed that observed interstitial water concentration changes in Ca and Mg are related to alteration of basaltic material, whereas those in Sr are due to calcium carbonate recrystallization processes. Support for the basaltic material alteration hypothesis comes from petrochemical and mineralogical data. Geochemical data also indicate that the high contents in Fe and Mn of the basal sediments can be related to low temperature alteration of basaltic glass and not necessarily to 'hydrothermal' activity.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -31.533700 * Longitude: 52.301800
Date/Time Start: 1972-08-03T00:00:00 * Date/Time End: 1972-08-03T00:00:00
Minimum DEPTH, sediment/rock: 356.2 m * Maximum DEPTH, sediment/rock: 381.8 m
Event(s):
25-245 * Latitude: -31.533700 * Longitude: 52.301800 * Date/Time: 1972-08-03T00:00:00 * Elevation: -4857.0 m * Penetration: 396.5 m * Recovery: 82 m * Location: Indian Ocean//BASIN * Campaign: Leg25 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 144.5 m cored; 6 m drilled; 56.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Calcium carbonate | CaCO3 | % | Gieskes, Joris M | ||
| 3 | Montmorillonite | Mnt | Gieskes, Joris M | |||
| 4 | Mica | Mica | Gieskes, Joris M | |||
| 5 | Quartz | Qz | Gieskes, Joris M | |||
| 6 | Feldspar | Fsp | Gieskes, Joris M | |||
| 7 | Clinoptilolite | Cpt | Gieskes, Joris M | |||
| 8 | Volcanic glass | Volc glass | Gieskes, Joris M | shards | ||
| 9 | Comment | Comment | Gieskes, Joris M |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
167 data points