Table 4.

Rare earth element concentrations (ppm) of the Pisha Sandstone from Ermaying, Heshanggou and Liujiagou Formation.

Sample No.	Ermaying										Heshanggou			Liujiagou
	sand stone	sand stone	sand stone	sand stone	sand stone	mud stone	sand stone	mud stone	sand stone	sand stone	silt stone	silt stone	silt stone	sand stone	sand stone
	Emy1	Emy2	Emy3	Emy4	Emy5	Emy6	Emy7	Emy8	Emy9	Emy10	Hsg1	Hsg2	Hsg3	Ljg1	Ljg2
La	43.10	32.40	37.60	33.50	20.60	43.90	47.00	33.80	19.80	23.70	50.70	28.00	42.80	21.60	36.70
Ce	71.60	61.90	70.80	67.30	46.00	80.20	80.10	62.50	25.10	40.30	91.60	60.90	61.60	31.60	66.00
Pr	9.27	6.75	8.58	6.93	5.00	10.60	10.30	8.17	3.71	4.88	10.20	6.80	9.06	4.19	7.34
Nd	33.00	23.70	32.30	24.10	19.10	39.90	37.00	30.40	13.20	17.70	36.10	24.70	33.20	14.90	25.30
Sm	5.17	3.60	6.28	3.63	3.46	7.33	5.82	5.12	2.11	2.98	5.61	4.24	5.50	2.48	3.94
Eu	1.15	0.89	1.86	0.69	0.81	1.70	1.23	1.12	0.68	0.83	1.25	0.91	1.23	0.63	0.90
Gd	3.68	2.59	5.85	2.95	2.72	6.40	4.13	3.81	1.78	2.46	4.20	3.19	4.30	2.18	3.03
Tb	0.50	0.36	0.97	0.45	0.37	0.93	0.56	0.53	0.26	0.37	0.61	0.46	0.62	0.35	0.44
Dy	2.59	1.94	5.57	2.68	1.99	5.36	2.95	2.83	1.51	2.13	3.34	2.51	3.43	2.11	2.41
Ho	0.48	0.39	1.12	0.57	0.39	1.08	0.56	0.55	0.31	0.43	0.66	0.49	0.68	0.44	0.47
Er	1.35	1.10	3.10	1.63	1.10	3.02	1.54	1.56	0.91	1.19	1.87	1.37	1.94	1.34	1.32
Tm	0.21	0.17	0.48	0.24	0.18	0.45	0.24	0.24	0.14	0.18	0.30	0.22	0.31	0.21	0.21
Yb	1.32	1.11	3.03	1.45	1.13	2.69	1.56	1.59	0.86	1.15	1.90	1.42	1.99	1.42	1.30
Lu	0.20	0.17	0.46	0.22	0.18	0.41	0.24	0.25	0.13	0.18	0.30	0.22	0.31	0.22	0.20
∑REE	173.62	137.07	178.00	146.35	103.04	203.97	193.24	152.47	70.51	98.48	208.63	135.43	166.97	83.68	149.56
LREE/HREE	15.80	16.50	7.65	13.35	11.78	9.03	15.39	12.42	10.94	11.18	14.84	12.70	11.30	9.11	14.95
Eu/Eu*	0.77	0.85	0.92	0.63	0.78	0.74	0.73	0.74	1.05	0.92	0.76	0.72	0.75	0.81	0.77
Ce/Ce*	0.81	0.94	0.90	0.99	1.04	0.85	0.82	0.86	0.65	0.84	0.90	1.01	0.70	0.74	0.90
La/Yb	32.65	29.19	12.41	23.10	18.23	16.32	30.13	21.26	23.00	20.61	26.68	19.72	21.51	15.21	28.23
LaN/YbN	22.06	19.72	8.39	15.61	12.32	11.03	20.36	14.36	15.54	13.93	18.03	13.32	14.53	10.28	19.08
LaN/SmN	5.25	5.66	3.77	5.81	3.75	3.77	5.08	4.16	5.91	5.01	5.69	4.16	4.90	5.48	5.86
GdN/YbN	2.26	1.89	1.56	1.65	1.95	1.93	2.15	1.94	1.68	1.73	1.79	1.82	1.75	1.24	1.89