Table 3 Major element abundances (in wt/%) of the northern China desert sands (125–250 μm).

Desert		n		SiO₂	Al₂O₃	Na₂O	K₂O	Log(SiO₂/Al₂O)	Log(Na₂O/K₂O)
Western Deserts	Taklamakan	61	Max	73.15	13.00	4.34	2.91	0.90	0.32
			Avg	66.80	10.95	2.82	2.33	0.79	0.08
			Min	53.53	8.01	2.08	1.63	0.68	− 0.04
	Gurbantunggut	25	Max	83.24	13.06	4.25	3.98	1.06	0.26
			Avg	74.21	9.97	2.22	2.36	0.88	− 0.04
			Min	58.75	7.23	1.06	1.47	0.70	− 0.43
	Qaidam	19	Max	76.14	11.18	3.01	2.82	1.02	0.23
			Avg	71.84	9.76	2.67	2.36	0.87	0.06
			Min	62.99	7.29	2.27	1.34	0.80	− 0.01
			Avg	70.95	10.23	2.57	2.35	0.84	0.03
Central Deserts	Badain Jaran	44	Max	83.74	9.71	2.48	1.98	1.06	0.15
			Avg	77.71	8.77	2.28	1.85	0.95	0.09
			Min	73.10	7.17	1.98	1.74	0.89	0.02
	Tengger	43	Max	81.98	9.55	2.53	2.67	0.99	0.12
			Avg	79.61	8.89	2.25	2.05	0.95	0.04
			Min	76.98	8.36	2.06	1.79	0.92	− 0.09
	Ulan Buh	9	Max	81.16	9.68	2.48	2.31	0.99	0.12
			Avg	79.03	9.02	2.36	2.08	0.94	0.06
			Min	77.75	8.32	2.25	1.80	0.91	0.02
	Kubuqi	13	Max	80.35	13.60	4.00	2.85	0.97	0.15
			Avg	77.96	9.27	2.38	2.02	0.93	0.07
			Min	72.79	8.42	2.12	1.81	0.73	0.04
	Mu Us	45	Max	85.13	14.29	3.95	3.06	1.11	0.22
			Avg	75.57	11.65	3.13	2.33	0.82	0.12
			Min	63.91	6.63	1.71	1.59	0.69	− 0.04
			Avg	77.98	9.52	2.48	2.07	0.92	0.08
Northeastern Sandy Lands	Hunshandake	24	Max	84.41	10.59	2.79	3.85	1.05	− 0.06
			Avg	80.96	9.09	2.26	3.22	0.95	− 0.16
			Min	77.77	7.53	1.81	2.84	0.87	− 0.24
	Horqin	31	Max	85.73	8.77	2.13	3.20	1.10	− 0.18
			Avg	83.78	7.57	1.79	3.03	1.04	− 0.23
			Min	79.19	6.78	1.45	2.86	0.97	− 0.32
	Hulunbeir	11	Max	86.98	8.16	1.95	3.22	1.13	− 0.21
			Avg	85.35	7.12	1.72	2.91	1.08	− 0.23
			Min	83.35	6.45	1.58	2.73	1.01	− 0.25
			Avg	83.36	7.93	1.92	3.05	1.03	− 0.21

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