Geochemical Mass Balance and Elemental Transport during the Weathering of the Black Shale of Shuijingtuo Formation in Northeast Chongqing, China

Table 1

Major element concentration, bulk densities, strain values, and corresponding Tau values for black shale from profile A, B, and C in study area.

Sample; No.	Depth; (m)	ρ; (g/cm^3)	SiO2; (%)	Al2O3; (%)	TFe2O3; (%)	K2O; (%)	Na2O; (%)	CaO; (%)	MgO; (%)	MnO; (%)	P2O5; (%)	BaO; (%)	SO3; (%)	LOI; (%)	Ti; (ppm)	pH
																		Si	Al	Fe	K	Na	Ca	Mg
A-1	0.1	1.53	65.5	13.60	8.10	2.84	2.52	0.29	0.97	0.22	0.20	0.53	0.23	4.39	4970	6.03	0.63	0.18	0.09	−0.23	0.01	0.07	−0.93	−0.63
A-2	0.25	1.79	65.7	13.70	7.78	2.87	2.63	0.28	0.96	0.05	0.25	0.47	0.30	4.41	5275	4.25	0.31	0.11	0.03	−0.31	−0.03	0.05	−0.93	−0.66
A-3	0.45	1.72	63.4	13.85	9.08	2.91	2.59	0.22	0.98	0.27	0.28	0.37	1.03	4.97	5138	3.28	0.40	0.10	0.07	−0.17	0.01	0.06	−0.95	−0.64
A-4	0.55	1.92	69.8	14.60	1.35	3.13	2.74	0.19	1.09	0.01	0.03	0.28	1.10	5.69	5271	2.82	0.22	0.18	0.10	−0.88	0.05	0.09	−0.96	−0.61
A-5	0.65	1.90	69.1	14.25	1.38	3.02	2.79	0.36	1.02	BDL	0.02	0.26	1.78	7.33	5818	2.68	0.12	0.06	−0.03	−0.89	−0.08	0.01	−0.92	−0.67
A-6	0.75	1.98	67.8	14.20	1.63	3.05	2.94	0.19	0.96	BDL	0.02	0.29	3.36	8.21	5657	3.40	0.10	0.07	0.00	−0.86	−0.04	0.09	−0.96	−0.68
A-7	0.85	2.22	62.6	13.35	3.97	2.93	2.56	1.58	1.20	0.02	0.09	0.46	7.26	8.56	5340	4.24	0.04	0.05	−0.01	−0.65	−0.03	0.01	−0.64	−0.58
A-8	1.1	2.42	55.7	11.70	4.93	2.51	2.28	5.94	2.16	0.05	0.17	0.32	8.31	10.64	5017	5.88	0.02	−0.01	−0.07	−0.54	−0.11	−0.04	0.46	−0.19
A-9	1.5	2.50	49.6	10.60	12.06	2.36	1.94	5.05	1.72	0.04	0.14	0.28	8.70	11.06	4767	6.12	0.04	−0.07	−0.12	0.19	−0.12	−0.14	0.30	−0.32
A-10	2.1	2.61	57.2	11.10	4.45	2.41	2.08	6.79	1.72	0.05	0.15	0.37	7.75	10.94	4859	6.88	−0.02	0.05	−0.09	−0.57	−0.12	−0.10	0.72	−0.34
A-11	3.0	2.65	52.3	11.75	9.93	2.63	2.22	3.80	2.49	0.05	0.18	0.33	6.25	10.76	4670	6.52	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
B-1	0.5	1.67	69.7	9.85	3.92	2.06	0.66	3.48	1.20	0.02	1.34	1.02	0.40	5.02	3542	7.04	0.34	−0.06	0.00	0.04	−0.13	−0.66	−0.28	−0.17
B-2	1.0	1.90	69.9	6.98	2.87	1.62	0.56	3.65	0.94	0.01	0.60	0.65	0.26	8.80	2486	6.55	0.67	0.35	0.01	0.09	−0.03	−0.59	0.08	−0.07
B-3	1.5	1.88	67.4	8.76	3.49	2.09	0.42	2.85	1.30	0.02	0.65	1.60	0.70	11.70	3234	6.62	0.30	0.00	−0.02	0.02	−0.03	−0.76	−0.35	−0.01
B-4	2.0	1.75	74.7	9.34	3.50	2.16	1.41	0.66	0.86	BDL	0.15	0.48	0.33	5.91	4355	6.20	0.04	−0.18	−0.23	−0.24	−0.26	−0.40	−0.89	−0.52
B-5	2.5	1.82	67.2	11.75	3.72	2.80	0.55	0.77	1.52	0.01	0.17	1.66	0.86	8.09	3834	6.02	0.13	−0.16	0.11	−0.09	0.09	−0.74	−0.85	−0.03
B-6	3.2	1.72	66.0	12.10	5.94	2.80	1.96	0.12	1.03	0.01	0.12	0.41	8.24	8.88	4275	4.43	0.08	−0.26	0.02	0.31	−0.02	−0.16	−0.98	−0.41
B-7	4.0	1.98	60.8	10.25	3.55	2.51	1.29	5.76	1.70	0.03	0.17	0.95	5.93	10.11	3764	6.50	0.06	−0.22	−0.02	−0.11	0.00	−0.37	0.13	0.11
B-8	4.8	2.14	59.7	13.00	4.42	3.11	1.84	3.74	2.04	0.03	0.20	0.52	7.00	9.01	4916	6.38	−0.24	−0.42	−0.05	−0.15	−0.05	−0.31	−0.44	0.02
B-9	5.5	2.21	59.4	13.35	4.13	3.06	2.01	3.56	2.09	0.03	0.20	0.46	6.47	9.01	5010	6.51	−0.28	−0.43	−0.04	−0.22	−0.09	−0.26	−0.48	0.02
B-10	6.2	2.38	59.7	13.35	4.13	3.01	2.29	4.00	1.94	0.04	0.19	0.50	5.83	8.37	4886	6.80	−0.32	−0.41	−0.01	−0.20	−0.08	−0.14	−0.40	−0.03
B-11	7.0	2.50	66.0	8.77	3.36	2.12	1.72	4.30	1.29	0.02	0.17	0.37	5.34	9.30	3167	7.12	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
C-1	0.5	1.56	65.5	15.30	2.73	2.87	0.23	2.73	2.03	0.22	0.79	0.20	0.18	8.99	6345	6.54	−0.44	−0.58	0.07	−0.71	−0.22	−0.62	−0.94	−0.75
C-2	1.0	1.49	70.5	16.60	1.33	3.19	0.30	0.31	0.74	0.02	0.04	0.83	0.30	5.01	5611	6.40	−0.34	−0.49	0.31	−0.84	−0.02	−0.44	−0.99	−0.90
C-3	1.5	1.35	69.8	16.70	0.87	3.38	0.23	0.41	0.77	0.01	0.03	0.59	0.18	5.84	5693	6.16	−0.29	−0.50	0.30	−0.90	0.02	−0.57	−0.99	−0.90
C-4	2.0	1.43	68.7	17.50	1.48	3.55	0.21	0.31	0.86	0.01	0.04	0.55	0.16	5.42	5689	6.35	−0.32	−0.51	0.37	−0.82	0.08	−0.61	−0.99	−0.88
C-5	3.0	1.57	63.9	15.85	4.82	3.28	0.20	0.37	0.77	0.01	0.04	0.61	4.16	9.26	6329	3.85	−0.48	−0.59	0.11	−0.48	−0.11	−0.67	−0.99	−0.91
C-6	4.0	1.79	60.5	15.20	6.73	3.08	0.20	0.63	1.02	0.14	0.14	0.63	5.25	10.60	4867	3.70	−0.37	−0.49	0.39	−0.06	0.09	−0.57	−0.98	−0.84
C-7	5.0	1.71	58.8	14.20	7.09	2.81	0.18	0.94	1.18	0.30	0.10	0.79	6.00	10.45	4643	4.74	−0.30	−0.48	0.36	0.04	0.04	−0.59	−0.97	−0.80
C-8	6.2	1.86	56.9	14.85	9.91	3.02	0.20	0.35	0.78	0.03	0.08	0.46	6.10	11.61	4627	4.65	−0.36	−0.50	0.42	0.46	0.13	−0.54	−0.99	−0.87
C-9	8.0	1.90	55.3	6.87	2.46	1.79	0.17	6.80	1.30	0.02	3.90	0.46	4.07	13.89	5055	6.83	−0.42	−0.55	−0.40	−0.67	−0.39	−0.65	−0.76	−0.80
C-10	9.0	2.45	53.6	6.45	2.71	1.66	0.18	8.00	1.84	0.02	1.74	0.35	4.18	17.53	2831	7.22	−0.20	−0.23	0.01	−0.35	0.01	−0.33	−0.53	−0.50
C-11	10.5	2.74	49.1	4.51	2.94	1.16	0.19	13.5	2.60	0.01	2.90	0.35	2.77	19.32	2002	7.26	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
UCC			66.0	15.20	5.00	3.40	3.90	4.20	2.20	0.06	0.50

Note: BDL, below detection limit: <0.01%.