(Table 1) Lithofacies interpretation and distribution in sediment core CRP-3
Cobertura |
LATITUDE: -77.006000 * LONGITUDE: 163.719000 * DATE/TIME START: 1999-10-09T00:00:00 * DATE/TIME END: 1999-11-19T00:00:00 * MINIMUM ELEVATION: -295.0 m * MAXIMUM ELEVATION: -295.0 m |
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Data(s) |
27/04/2001
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Resumo |
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. |
Formato |
text/tab-separated-values, 40 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.465143 doi:10.1594/PANGAEA.465143 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
doi:10.1594/PANGAEA.510761 Fielding, Christopher R; Dunbar, Gavin B; Bryce, SM (2001): Laser-derived particle size data from CRP-3, Victoria Land Basin, Antarctica: Implications for sequence and seismic stratigraphy. Terra Antartica, 8(3), 255-262, hdl:10013/epic.28203.d001 Fielding, Christopher R; Naish, Tim R; Woolfe, Ken (2001): Facies architecture of the CRP-3 drillhole, Victoria Land Basin, Antarctica. Terra Antartica, 8(3), 217-224, hdl:10013/epic.28206.d001 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Palavras-Chave | #Cape Roberts Project; Core wireline system; CRP; CRP-3; CWS; Distribution; Facies name/code; Interpretation; Lithology/composition/facies; Ross Sea; Sampling/drilling from ice |
Tipo |
Dataset |