Geofluids

Research Article

Groundwater-Mixing Mechanism in a Multiaquifer System Based on Isotopic Tracing Theory: A Case Study in a Coal Mine District, China

Table 1

Mean of chemical composition of water samples in the study area (mg/L).


Number	Type	K⁺ (mg/L)	Na⁺ (mg/L)	Ca²⁺ (mg/L)	Mg²⁺ (mg/L)	Cl⁻ (mg/L)	SO₄²⁻ (mg/L)	HCO₃⁻ (mg/L)	CO₃²⁻ (mg/L)	pH	TDS (mg/L)	δO_-SMOW (‰)	δD_-SMOW (‰)	H³ (TU)	¹⁴C (pmc)	δ ¹³C-PDB (‰)

1	CLG	1.69	35.09	123.36	34.15	24.26	172.04	376.63	0	7.21	570	−8.2	−67.9	13.31		−9.36
2	CLG	2.23	34.55	122.82	33.88	24.08	171.9	376.09	0	7.23	560	−8.1	−66.3	13.31		−9.87
3	CLG	2.01	54.04	127.85	35.94	24.15	194.6	425.13	0	7.09	653	−8	−64.5	10.15		−9.74
4	CLG	3.12	52.93	126.74	35.38	23.78	194.32	424.02	0	7.2	643	−7.8	−62.5	10.15		−9.35
5	CLG	1.01	34.08	120.33	33.14	23.25	169.01	372.59	0	7.05	681	−7.9	−66.2	11.21		−12.05
6	CLG	0.58	33.97	121.08	33.3	23.5	170.16	373.77	0	7.06	672	−8.1	−65.1	12.12		−9.36
7	CLG	2.35	51.69	120.8	33.59	21.8	187.55	415.73	0	7.03	663	−8	−67.1	10.57		−9.16
8	MIX	1.05	110.43	144.84	42.73	31.56	331.08	456.6	0	7.3	899	−8	−65.2	18.31		−9.25
9	MIX	3.24	108.24	142.65	41.63	30.83	330.53	454.41	0	7.32	880	−8.2	−66.3	18.31		−9.13
10	MIX	1.23	313.82	195.96	93.67	33.28	626.56	987.29	0	6.89	1987	−8.3	−66.5	13.17		−9.61
11	MIX	2.12	312.93	195.07	93.22	32.98	626.34	986.4	0	6.81	1748	−8.5	−67.3	13.17		−9.78
12	MIX	1.15	107.67	148.75	42.68	31.53	335.57	456.5	0	7.26	818	−7.9	−66.2	17.39		−8.45
13	MIX	2.13	106.69	147.77	42.19	31.2	335.33	455.52	0	7.23	886	−7.8	−67.2	17.39		−6.72
14	MIX	0.58	75.9	151.72	33.24	28.17	308.15	377.74	0	7.61	765	−8.3	−66.5	13.17		−7.89
15	MIX	0.95	75.53	151.35	33.06	28.04	308.05	377.37	0	7.69	775	−8.1	−65.4	13.17		−8.12
16	QG	6.12	27.5	182.26	21.24	47.59	221.56	402.71	0	7.02	700	−8	−63.7	15.17		−8.02
17	QG	4.32	29.3	184.06	22.14	48.19	222.01	404.51	0	7.12	710	−8.2	−64.5	15.17		−5.79
18	QG	1.23	58.65	181.53	28.37	36.81	234.3	480.83	0	6.62	771	−8.2	−68.3	16.29		−8.82
19	QG	2.31	57.57	180.45	27.83	36.45	234.03	479.75	0	6.63	782	−8.4	−69.3	16.29		−5.92
20	QG	3.12	37.68	160.41	30.52	43.28	200.08	424.02	0	6.93	692	−7.7	−62.8	21.51		−4.61
21	QG	2.14	38.66	161.39	31.01	43.61	200.33	425	21.5	9.85	682	−7.6	−63.7	21.51		−8.74
22	QG	7.12	10.56	89.07	1.35	10.04	73.95	218.65	0	7.42	303	−7.2	−61.2	15.16		−11.35
23	CSG	15.02	300.76	5.14	4.78	51.51	1.22	715.02	15.3	8.1	743	−10	−75.5	3.18	—	−12.83
24	CSG	16.02	304.76	9.42	6.78	52.84	2.22	719.02	15.1	8.15	726	−10.4	−76.5	2.38	16.2	−13.01
25	CSG	17.12	289.68	5.34	4.67	46.91	1.02	718	16.8	8.79	764	−9.5	−74.3	4.76	—	−13.98
26	CSG	16.03	298.67	4.63	3.82	49.04	1.13	716.87	17.4	8.46	772	−10.1	−76.6	2.12	16.8	−13.26
27	CSG	14.15	297.35	7.32	6.53	40.41	2.01	714.86	11.2	8.12	743	−11.1	−85.9	< 0.5	13.6	−11.85
28	CSG	13.02	312.52	6.57	5.35	43.74	1.53	713.33	9.6	8.23	754	−10.3	−77.1	3.03	—	−11.25
29	CSG	10.58	311.12	4.68	4.36	36.11	2.13	711.2	8.5	8.15	712	−9.7	−76.2	2.12	—	−10.14
30	CSG	20.89	322.05	6.55	5.54	38.24	2.05	709.15	8.7	8.34	736	−9.6	−73.2	5.52	—	−9.62
31	sw	3.11	33.42	90.69	20.81	14.92	140	277.59	0	7.78	741	−6.9	−62.6	14.78		−11.21
32	sw	4.02	32.5	89.77	20.35	14.61	139.77	276.67	0	7.35	437	−6.6	−60.6	14.78		−12.05
33	sw	4.53	15.67	78.03	19.12	12.67	94.36	257.86	0	7.77	356	−6.7	−62.1	16.05		−11.36
34	sw	5.21	14.99	77.35	18.78	12.44	94.19	257.18	0	7.72	352	−6.8	−61.6	16.05		−13.24
35	sw	2.13	59.92	114.1	25.67	27.65	200.33	333.48	0	7.76	598	−7.4	−63.1	16.62		−10.25
36	sw	3.14	58.91	113.09	25.16	27.31	200.08	332.47	0	7.67	589	−7.3	−63.9	16.62		−11.58
37	sw	6.23	11.45	89.96	1.12	10.33	74.17	219.54	0	7.47	316	−7	−61.3	15.16		−11.64

CLG: Cambrian groundwater aquifer; QG: Quaternary aquifer groundwater; CSG: coal-bearing sandstone aquifer groundwater; sw: surface water; MIX: represent mixing water.