Tieh, Thomas T; Stearns, Steven; Presley, Bobby J (1986): Mineralogy and incipient diagenesis of Pigmy Basin sediments, DSDP Hole 96-619 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788187, Supplement to: Tieh, TT et al. (1986): Mineralogy and incipient diagenesis of Pigmy Basin sediments, Hole 619, Deep Sea Drilling Project Leg 96. In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 577-585, https://doi.org/10.2973/dsdp.proc.96.129.1986
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Abstract:
Pigmy Basin sediments cored in Hole 619 of Deep Sea Drilling Project Leg 96 are silty clays composed, on the average, of < 1% sand, 37% silt, 48% clay, and 14% carbonate minerals. Except for minor grain dissolution in some silt grains, there is no distinctive variation with depth in either composition or texture of the sand- and silt-sized minerals. This suggests a constant source of sediment supply and little diagenetic alteration of these size fractions.
Clay minerals are dominated by smectite or, more precisely, montmorillonite. On the average, the clay-sized fraction consists of 48% smectite and mixed layer minerals, 30% illite, and 23% total kaolinite and chlorite. There appears to be a slight decrease in smectite and concomitant increases in other clay minerals with depth. These changes are further substantiated by the variations of ammonium acetate exchangeable K+, Mg2+, and Na+ in bulk samples. Thus, incipient diagenesis of Pigmy Basin sediments is evidenced in the mineralogical and associated chemical characteristics of the clay fractions.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 27.193500 * Longitude: -91.409000
Date/Time Start: 1983-10-21T00:00:00 * Date/Time End: 1983-10-21T00:00:00
Event(s):
96-619 * Latitude: 27.193500 * Longitude: -91.409000 * Date/Time: 1983-10-21T00:00:00 * Elevation: -2259.0 m * Penetration: 208.7 m * Recovery: 111.9 m * Location: Gulf of Mexico * Campaign: Leg96 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 134.4 m cored; 0 m drilled; 83.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Tieh, TT; Stearns, S; Presley, BJ (1986): (Table 3) NH4OAc exchangeable cations of samples from Pigmy Basin sediments, DSDP Hole 96-619. https://doi.org/10.1594/PANGAEA.788186
- Tieh, TT; Stearns, S; Presley, BJ (1986): (Table 2) Clay mineral composition from Pigmy Basin sediments, DSDP Hole 96-619. https://doi.org/10.1594/PANGAEA.788185
- Tieh, TT; Stearns, S; Presley, BJ (1986): (Table 1) Grain size distribution, carbonates, and samples from Pigmy Basin sediments,DSDP Hole 96-619. https://doi.org/10.1594/PANGAEA.788182