Mineralogy and incipient diagenesis of Pigmy Basin sediments, DSDP Hole 96-619
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| Autores principales: | , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1986
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| _version_ | 1867170463297306624 |
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| author | Tieh, Thomas T Stearns, Steven Presley, Bobby J |
| author_facet | Tieh, Thomas T Stearns, Steven Presley, Bobby J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_788187 |
| institution | PANGAEA |
| language | en |
| publishDate | 1986 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineralogy and incipient diagenesis of Pigmy Basin sediments, DSDP Hole 96-619 Tieh, Thomas T Stearns, Steven Presley, Bobby J 96-619; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Gulf of Mexico; Leg96 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. |
| title | Mineralogy and incipient diagenesis of Pigmy Basin sediments, DSDP Hole 96-619 |
| topic | 96-619; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Gulf of Mexico; Leg96 |
| url | https://doi.org/10.1594/PANGAEA.788187 |