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. [an error occurred while processing this directive]