Table 5. Six factor principal components model with rotated factor loadings, communalities, and variance for alteration types mapped by ASTER and watershed water quality parameters.

Variable / Factor 1 / Factor 2 / Factor 3 / Factor 4 / Factor 5 / Factor 6 / Communality
Advanced Arg / 0.831 / 0.143 / 0.272 / 0.024 / -0.011 / -0.218 / 0.833
Argillic or Clay-Bearing Rocks / 0.942 / 0.022 / 0.102 / 0.015 / -0.045 / -0.143 / 0.921
Argillic + ferric Iron / 0.951 / 0.044 / 0.160 / 0.006 / 0.142 / -0.169 / 0.981
Sum_All_Arg / 0.959 / 0.053 / 0.161 / 0.013 / 0.046 / -0.173 / 0.981
QSP (Phyllic) / 0.931 / 0.151 / 0.139 / 0.018 / 0.116 / 0.125 / 0.938
Sum_all_QSP / 0.931 / 0.095 / 0.138 / 0.013 / 0.126 / 0.123 / 0.938
Propylitic or carbonate rocks / -0.084 / -0.756 / 0.014 / -0.025 / -0.575 / 0.029 / 0.910
propylitic + sericite / -0.120 / -0.938 / 0.005 / -0.015 / -0.158 / 0.065 / 0.923
Prop_all_no_fe / -0.061 / -0.955 / -0.053 / -0.029 / -0.245 / 0.052 / 0.981
propylitic + ferric iron / -0.085 / -0.900 / -0.076 / -0.033 / 0.258 / -0.023 / 0.890
propylitic + sericite + ferric / -0.084 / -0.844 / -0.100 / -0.008 / 0.429 / 0.016 / 0.913
region prop to weak QSP minor s / 0.747 / -0.175 / 0.054 / -0.065 / 0.386 / 0.413 / 0.914
regional prop - Fe/Mg sericite / 0.007 / -0.942 / -0.135 / -0.036 / 0.030 / 0.053 / 0.912
Al / 0.649 / 0.110 / 0.413 / 0.081 / 0.192 / -0.572 / 0.975
Cu / -0.041 / 0.124 / -0.050 / 0.964 / -0.003 / -0.022 / 0.949
Fe / 0.594 / 0.147 / 0.457 / 0.237 / 0.108 / -0.499 / 0.901
pH / -0.309 / -0.133 / -0.406 / -0.418 / -0.526 / 0.420 / 0.906
SO4 / 0.258 / 0.100 / 0.949 / -0.003 / 0.108 / -0.015 / 0.990
Specific Conductance / 0.335 / 0.108 / 0.918 / 0.015 / 0.070 / -0.123 / 0.987
Zn / 0.030 / -0.057 / 0.078 / 0.916 / 0.268 / -0.059 / 0.925
Alkalinity / -0.241 / 0.053 / -0.187 / -0.296 / -0.708 / 0.034 / 0.686
Variance / 6.8540 / 4.9541 / 2.5466 / 2.1031 / 1.7847 / 1.1124 / 19.3550
% variance / 0.326 / 0.236 / 0.121 / 0.100 / 0.085 / 0.053 / 0.922