Chapter 6
 
Table 3 - Summary statistics grouped by sedimentary environment
 
Environment   Coarse-grained Bedload Transport n= 32       Erosional     n=25
Measured Parameter 1 MEDIAN ARITHMETIC MEAN STD. DEV.
(% of mean)		 MAX MIN2 ENRICHMENT RATIO3  
MEDIAN
ARITHMETIC MEAN
 STD. DEV.
(% of mean)		 MAX MIN2 ENRICHMENT RATIO3
C. perfringens 23.5 328 500 9300 0     50.0 152 140 840 0  
% fines 1.48 2.90 135 19 0     4.46 14.4 164 96 0  
Ag 0.00 0.02 566 1 0 0.39   0.00 0.09 122 0 0 1.74
Al 4.28 4.05 15 5 2 0.61   3.36 3.24 59 7 1 0.48
Ba 286 308 42 824 203 0.82   240 226 56 442 47 0.60
Ca 0.97 1.01 37 2 0 0.95   0.62 0.90 88 3 0 0.85
Cd 0.00 0.02 149 0 0 0.12   0.07 0.08 109 0 0 0.42
Cr 28.0 30.0 56 74 0 0.51   39.6 36.3 82 114 0 0.62
Cu 2.94 3.18 111 14 0 0.40   5.34 13.8 107 56 0 1.73
Fe 1.75 2.18 70 9 0 0.61   2.05 2.30 91 9 0 0.64
Hg 15.5 42.5 122 147 1     59.5 64.6 80 170 7  
Mn 686 962 74 3667 125 1.77   804 1042 88 4276 64 1.92
Ni 12.9 15.9 92 90 5 0.64   13.8 15.5 70 40 0 0.62
Pb 15.7 16.4 37 38 3 0.71   22.8 23.6 53 55 5 1.02
Ti 0.24 0.31 91 1 0 0.77   0.25 0.32 95 2 0 0.77
V 40.6 44.5 52 129 4 0.49   48.6 45.0 76 116 0 0.50
Zn 37.9 40.0 46 87 7 0.59   47.0 53.1 69 150 0 0.78
Zr 44.5 68.2 104 407 23 0.52   62.3 66.2 58 168 5 0.50

 
 
Environment   Sediment sorting and reworking n=64       Depositional   n=98
Measured Parameter 1
MEDIAN
 ARITHMETIC MEAN STD. DEV.
(% of mean)		 MAX MIN2 ENRICHMENT RATIO3  
MEDIAN
 ARITHMETIC MEAN STD. DEV.
(% of mean)		 MAX MIN2 ENRICHMENT RATIO3
C. perfringens 270 522 155 4500 3     890 1382 130 15000 14  
% fines 19.3 30.2 85 97 0     88.6 81.7 23 99 0  
Ag 0.13 0.21 107 1 0 4.12   0.42 0.44 73 3 0 8.79
Al 4.70 4.67 36 10 0 0.70   6.26 6.10 19 10 0 0.91
Ba 296 298 29 456 5 0.79   374 375 25 1180 225 0.99
Ca 1.20 1.28 68 5 0 1.21   1.32 1.44 51 5 0 1.36
Cd 0.09 0.14 126 1 0 0.77   0.17 0.25 104 2 0 1.37
Cr 48.7 59.9 55 145 5 1.01   88.4 93.3 33 231 26 1.58
Cu 26.0 35.0 117 275 0 4.37   56.9 59.5 48 146 4 7.44
Fe 2.33 2.42 39 6 0 0.68   3.29 3.31 26 8 0 0.93
Hg 84.5 93.8 70 294 0     173 176 39 388 0  
Mn 815 900 51 2913 82 1.66   903 1011 48 4627 286 1.86
Ni 18.9 21.7 66 90 2 0.87   29.1 32.2 64 212 12 1.29
Pb 27.8 33.2 61 135 4 1.44   42.0 47.7 43 147 17 2.07
Ti 0.34 0.37 57 2 0 0.90   0.39 0.39 32 1 0 0.96
V 56.2 58.9 36 103 4 0.65   91.9 88.5 17 119 22 0.98
Zn 70.8 90.0 58 268 12 1.32   144 146 32 294 31 2.14
Zr 104 124 112 1145 22 0.94   124 129 24 241 44 0.98


1 Parameter names and units are reported in Table 1.
2 Zeros in the minimum value represent measured concentrations reported as below the detection limit.
3 The enrichment factor is calculated as the ratio of the mean to the natural background from depositional area (Table 1).  Bold type indicates enrichment.

U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/2000/of00-304/htmldocs/chap06/chemtab3.htm
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