This script makes a ternary diagram for sand, mud and gravel, assuming
that mud=(silt+clay). The plot is based on Schlee (1973), a modification
on the Shepard (1954) classification system. The Schlee modification
utilizes the same ternary plotting style, but adjusts to include the
larger sized portion of sediments.
This script is a modification of the TERNPLOT script by Carl Sandrock (20020827),
and the 'Shepard.m' written by William (Bill) Waite.
This modification simply adds the labels required for the Schlee diagram.
NOTE: The plotted result may be screen dependent. If this happens,
simply use the magnify tool to zoom in on the plot.
Gravel
/ \
/ \
Sand --- Mud
REFRENCES:
Shepard, F.P., 1954, Nomenclature based on
sand-silt-clay ratios: Journal Sedimentary
Petrology, v. 24, p. 151-158.
Schlee, John, 1973, Atlantic Continental Shelf and
Slope of the United States sediment texture of the northeastern part:
U.S. Geological Survey Professional Paper 529-L, 64 p. |
