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Settling behaviour related to sieve analysis of skeletal sands
Author(s) -
BRAITHWAITE C. J. R.
Publication year - 1973
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1973.tb02048.x
Subject(s) - geology , sieve (category theory) , settling , carbonate , mineralogy , grain size , spiral (railway) , sedimentation , geometry , geomorphology , sediment , mathematics , materials science , physics , thermodynamics , mathematical analysis , combinatorics , metallurgy
One thousand grains selected from sieved samples of a bioclastic sand have been individually measured, weighed and timed in free unhindered fall at terminal velocity in a 250 cm column of sea water. Four fall regimes are represented: straight fall, spinning and spiral modes and erratic tumbling. As size increases grains pass through this series at rates dependent upon shape and effective density. Computed best‐fit curves for velocities/intermediate diameter and an equivalent sphere/intermediate diameter illustrate considerable divergencies in behaviour between the eleven grain types and five shape classes examined. Current methods of analysis of carbonate sediments, by sieving, by grain‐counting of components, and by sedimentation balance, provide different kinds of information which it is impractical to consider as having any simple relationship to each other.