Laser-derived particle size data from CRP-3, Victoria Land Basin, Antarctica: Implications for sequence and seismic stratigraphy

Fielding, C. R., Dunbar, G. B. and Bryce, S.M. (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.


Author Fielding, C. R.
Dunbar, G. B.
Bryce, S.M.
Title Laser-derived particle size data from CRP-3, Victoria Land Basin, Antarctica: Implications for sequence and seismic stratigraphy
Journal name Terra Antartica   Check publisher's open access policy
ISSN 1122-8628
Publication date 2001
Sub-type Article (original research)
Volume 8
Issue 3
Start page 255
End page 262
Total pages 8
Editor Peter J Barrett
Carlo Alberto Ricci
Place of publication Siena
Publisher Terra Antartica Publication
Collection year 2001
Language eng
Subject C1
260104 Sedimentology
780104 Earth sciences
0499 Other Earth Sciences
Abstract Seven hundred and nineteen samples from throughout the Cainozoic section in CRP-3 were analysed by a Malvern Mastersizer 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 and 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 others studies.
Keyword Cenozoic
laser method
lithology
particle size
seismic stratigraphy
sequence stratigraphy
well logging
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Earth Systems Science Computational Centre Publications
 
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Created: Tue, 14 Aug 2007, 15:26:25 EST