(Table 1) Lithofacies interpretation and distribution in sediment core CRP-3
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2001
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| _version_ | 1867169235782860800 |
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| author | Fielding, Christopher R Naish, Tim R Woolfe, Ken |
| author_facet | Fielding, Christopher R Naish, Tim R Woolfe, Ken |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Seven hundred and nineteen samples from throughout the Cainozoic section in CRP-3 were analysed by a Malvern Mastersizes laser particle analyser, in order to derive a stratigraphic distribution of grain-size parameters downhole. Entropy analysis of these data (using the method of Woolfe & Michibayashi, 1995) allowed recognition of four groups of samples, each group characterised by a distinctive grain-size distribution. Group 1, which shows a multi-modal distribution, corresponds to mudrocks, interbedded mudrock/sandstone facies, muddy sandstones and diamictites. Group 2, with a sand-grade mode but showing wide dispersion of particle size, corresponds to muddy sandstones, a few cleaner sandstones and some conglomerates. Group 3 and Group 4 are also sand-dominated, with better grain-size sorting, and correspond to clean, well-washed sandstones of varying mean grain-size (medium and fine modes, respectively). The downhole disappearance of Group 1, and dominance of Groups 3 and 4 reflect a concomitant change from mudrock- and diamictite-rich lithology to a section dominated by clean, well-washed sandstones with minor conglomerates. Progressive downhole increases in percentage sand and principal mode also reflect these changes. Significant shifts in grain-size parameters and entropy group membership were noted across sequence boundaries and seismic reflectors, as recognised in other studies. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_465143 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Lithofacies interpretation and distribution in sediment core CRP-3 Fielding, Christopher R Naish, Tim R Woolfe, Ken Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Distribution; Facies name/code; Interpretation; Lithology/composition/facies; Ross Sea; Sampling/drilling from ice Seven hundred and nineteen samples from throughout the Cainozoic section in CRP-3 were analysed by a Malvern Mastersizes laser particle analyser, in order to derive a stratigraphic distribution of grain-size parameters downhole. Entropy analysis of these data (using the method of Woolfe & Michibayashi, 1995) allowed recognition of four groups of samples, each group characterised by a distinctive grain-size distribution. Group 1, which shows a multi-modal distribution, corresponds to mudrocks, interbedded mudrock/sandstone facies, muddy sandstones and diamictites. Group 2, with a sand-grade mode but showing wide dispersion of particle size, corresponds to muddy sandstones, a few cleaner sandstones and some conglomerates. Group 3 and Group 4 are also sand-dominated, with better grain-size sorting, and correspond to clean, well-washed sandstones of varying mean grain-size (medium and fine modes, respectively). The downhole disappearance of Group 1, and dominance of Groups 3 and 4 reflect a concomitant change from mudrock- and diamictite-rich lithology to a section dominated by clean, well-washed sandstones with minor conglomerates. Progressive downhole increases in percentage sand and principal mode also reflect these changes. Significant shifts in grain-size parameters and entropy group membership were noted across sequence boundaries and seismic reflectors, as recognised in other studies. |
| title | (Table 1) Lithofacies interpretation and distribution in sediment core CRP-3 |
| topic | Cape Roberts Project; Core wireline system; CRP; CRP-3; CRP-3__Campaign; CWS; Distribution; Facies name/code; Interpretation; Lithology/composition/facies; Ross Sea; Sampling/drilling from ice |
| url | https://doi.org/10.1594/PANGAEA.465143 |