## Appendix A  
Tables A1 and A2 Statistics of Geochemical Background Values and Baseline Values for Different Deserts and Sandy Areas.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Element** & **Hunshandak** & **Horain** & **Hulun Buir** &
\begin{tabular}{c} **Badain** \\ **Jaran** \\ \end{tabular} & **Ulan Buhe** & **Mu Us** & **Hobq** & **Tengger** \\ \hline SiO\({}_{2}\) & 85.409 & 88.249 & 89.740 & 78.6  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Element** & **Kumtag** & **Gurbantunggut** & **Taklimakan** & **Qaidam** & **UCC** & **Baseline** & **Baseline Range** \\ \hline SiO\({}_{2}\) & 65.805 & 71.855 & 61.112 & 58.014 & 66.620 & 75.337 & 49.960–113.605 \\ Al\({}_{2}\)O\({}_{3}\) & 10.141 & 10.434 & 9.783 & 9.225 & 15.400 & 7.992 & 4.942–12.927 \\ TFe\({}_{2}\)O\({}_{3}\) & 3.001 & 2.972 & 2.234 & 1.849 & 5.040 & 1.420 & 0.388–5.202 \\ MgO & 2.475 & 1.191 & 2.261 & 1.519 & 2.480 & 0.582 & 0.072–4.701 \\ CaO & 6.381 & 2.784 & 7.645 & 9.977 & 3.590 & 1.407 & 0.145–13.679 \\ Na\({}_{2}\)O & 2.775 & 2.272 & 2.829 & 2.930 & 3.270 & 2.008 & 0.937–4.303 \\ K\({}_{2}\)O & 1.798 & 2.269 & 2.237 & 2.120 & 2.800 & 2.209 & 1.445–2.973 \\ Ag & 41.352 & 49.946 & 37.279 & 49.153 & 53.000 & 42.394 & 24.473–73.437 \\ As & 5.546 & 7.003 & 6.408 & 6.555 & 4.800 & 3.614 & 1.198–10.904 \\ Au & 1.920 & 1.302 & 0.881 & 0.808 & 1.500 & 0.633 & 0.249–1.605 \\ B & 40.417 & 37.746 & 44.069 & 34.985 & 17.000 & 16.384 & 4.798–55.953 \\ Ba & 570.059 & 515.546 & 559.338 & 483.902 & 624.000 & 583.416 & 348.347–818.485 \\ Be & 1.467 & 1.820 & 1.887 & 1.579 & 2.100 & 1.247 & 0.705–2.206 \\ Bi & 0.158 & 0.194 & 0.169 & 0.192 & 0.160 & 0.106 & 0.040–0.281 \\ Br & 0.897 & 1.411 & 1.082 & 0.873 & 1.600 & 0.836 & 0.493–1.419 \\ Cd & 69.450 & 86.760 & 83.411 & 200.818 & 0.090 & 43.345 & 13.499–139.181 \\ Cl & 2489.497 & 1037.997 & 17,971.754 & 8176.649 & 370.000 & 80.713 & 4.050–1608.485 \\ Co & 8.439 & 7.732 & 5.901 & 4.729 & 17.300 & 3.462 & 0.845–14.182 \\ Cr & 49.974 & 34.632 & 32.502 & 21.687 & 92.000 & 18.510 & 3.386–101.195 \\ Cu & 14.640 & 18.733 & 12.196 & 10.941 & 28.000 & 8.568 & 3.316–22.138 \\ F & 334.623 & 349.961 & 373.148 & 302.346 & 557.000 & 159.147 & 45.440–557.389 \\ Ga & 11.529 & 13.168 & 11.423 & 11.040 & 17.500 & 9.704 & 6.394–14.727 \\ Ge & 1.169 & 1.111 & 1.049 & 0.915 & 1.400 & 1.013 & 0.740–1.387 \\ Hg & 9.495 & 10.785 & 9.438 & 9.669 & 0.050 & 7.752 & 4.490–13.384 \\ I & 0.621 & 1.721 & 0.558 & 1.002 & 1.400 & 0.426 & 0.160–1.132 \\ Li & 17.341 & 18.356 & 20.950 & 13.707 & 21.000 & 9.444 & 3.564–25.024 \\ Mn & 276.620 & 606.612 & 347.138 & 271.722 & / & 220.406 & 68.647–707.657 \\ Mo & 0.785 & 1.037 & 1.213 & 0.834 & 1.100 & 0.296 & 0.075–1.166 \\ N & 111.946 & 330.449 & 175.894 & 81.724 & 83.000 & 78.948 & 25.827–241.330 \\ Nb & 8.322 & 8.827 & 9.204 & 7.057 & 12.000 & 6.816 & 4.427–10.494 \\ Ni & 22.256 & 16.852 & 16.049 & 11.561 & 47.000 & 10.647 & 3.276–34.602 \\ P & 352.538 & 441.268 & 375.001 & 313.684 & 654.572 & 201.466 & 69.604–583.135 \\ Pb & 12.914 & 15.454 & 15.091 & 17.821 & 17.000 & 13.043 & 8.874–19.170 \\ pH & 9.168 & 9.233 & 9.174 & 8.720 & / & 8.451 & 6.645–10.748 \\ Rb & 67.333 & 76.247 & 81.180 & 78.264 & 84.000 & 71.511 & 52.241–97.889 \\ S & 7537.253 & 1537.105 & 5536.793 & 25043.051 & 621.000 & 107.837 & 3.733–3115.437 \\ Sb & 0.546 & 0.613 & 0.536 & 0.737 & 0.400 & 0.361 & 0.129–1.010 \\ Se & 0.148 & 0.331 & 0.078 & 0.099 & 0.090 & 0.062 & 0.023–0.163 \\ \hline \hline \end{tabular}
\end{table}
Table 1: _Cont._