Geofluids

Research Article

Methane Source and Turnover in the Shallow Sediments to the West of Haima Cold Seeps on the Northwestern Slope of the South China Sea

Table 3

Concentrations and isotope ratios of various dissolved components at cores CL30, CL44, and CL47.


Depth (cmbsf)	CH₄ (mM)	SO₄^2- (mM)	Ca²⁺ (mM)	Mg²⁺ (mM)	PO₄^3- (μM)	Ba²⁺ (μM)	DIC (mM)	δ¹³C_DIC (‰, VPDB)

CL30
55	0.0016	26.7	10.9	47.9	27.0	23.0	6.0	-20.4
110	0.0012	24.4	10.5	48.3	31.5	19.8	7.6	-26.0
170	0.0010	21.7	9.5	47.6	41.0	17.9	10.1	-31.9
230	0.0051	19.0	8.9	47.5	49.9	17.6	11.1	-35.4
290	0.0012	15.4	7.9	46.5	39.2	9.9	12.4	-38.0
350	0.0000	13.1	7.0	46.1	45.5	20.0	14.3	-40.5
410	0.0056	5.3	4.5	44.3	97.2	16.1	19.2	-45.7
470	0.8752	1.0	3.7	43.8	112	46.5	22.8	-46.4
530	3.2660	0.4	3.5	43.1	122	53.5	23.0	-40.0
590	0.1318	0.2	3.4	43.7	116	60.8	23.7	-35.7
CL44
10	0.0012	27.9	7.4	52.7	11.9	0.3	2.2	-10.9
30	0.0004	27.9	7.4	52.4	10.1	0.3	2.6	-10.5
50	0.0008	27.6	7.5	54.1	10.4	0.2	3.0	-12.1
70	0.0003	27.2	7.0	52.7	9.3	0.2	3.0	-14.8
90	0.0020	27.3	7.3	53.8	9.6	0.2	2.4	-10.9
110	0.0005	26.7	7.2	54.0	9.1	0.2	2.4	-11.6
130	0.0005	27.4	7.2	54.5	8.3	0.2	2.4	-11.9
150	0.0008	26.9	7.3	54.3	7.1	0.2	2.5	-14.1
170	0.0007	27.5	7.5	54.3	8.1	0.2	3.0	-13.1
190	0.0006	27.5	7.3	54.7	10.9	0.2	2.5	-12.1
210	0.0005	25.6	7.3	54.6	13.2	0.2	3.8	-17.2
230	0.0017	25.9	7.0	54.2	13.7	0.2	3.5	-18.5
250	0.0009	25.3	6.9	52.5	17.7	0.2	4.6	-20.4
270	0.0018	24.1	6.3	51.6	22.3	0.3	5.5	-24.0
290	0.0018	22.6	6.2	52.6	22.6	0.4	5.9	-23.1
310	0.0014	21.5	6.0	53.0	35.1	0.3	6.8	-25.0
330	0.0011	19.0	5.5	51.6	35.6	0.3	7.7	-28.8
350	0.0017	19.7	5.1	51.0	47.3	0.3	8.1	-24.3
370	0.0020	17.9	4.9	50.5	49.8	0.3	8.8	-30.1
390	0.0015	16.4	4.6	50.5	50.8	0.4	9.5	-31.2
410	0.0020	16.0	4.2	49.7	54.9	0.6	10.2	-31.9
430	0.0012	15.6	3.9	47.8	52.1	0.5	11.0	-33.4
450	0.0021	15.4	3.7	48.4	56.5	0.5	11.6	-35.1
470	0.0022	13.2	3.6	50.3	55.4	0.6	12.0	-35.7
490	0.0019	12.8	3.1	48.0	63.6	0.7	13.1	-35.8
510	0.0026	12.0	2.7	48.4	67.1	0.8	13.1	-39.9
530	0.0027	10.0	2.4	47.5	81.9	1.0	15.5	-39.1
550	0.0024	8.9	2.2	47.4	88.0	1.3	16.3	-39.3
570	0.0034	5.6	2.0	45.5	96.7	2.5	18.2	-40.5
590	0.0039	4.7	1.8	44.6	101	4.9	19.5	-41.0
610	0.0028	3.7	1.7	44.5	103	11.0	18.9	-39.7
630	0.0022	2.7	1.6	44.2	57.0	19.3	20.5	-40.5
650	0.0442	2.3	1.7	43.3	111	22.2	19.9	-39.6
670	0.5139	2.1	1.8	44.7	109	31.7	21.1	-37.1
690	1.1022	0.9	1.4	44.5	107	37.9	20.4	-37.4
710	2.5450	0.8	1.3	43.9	102	38.6	21.5	-36.1
730	0.0086	0.9	1.4	44.6	105	37.4	20	-36.8
750	1.1475	1.1	1.2	43.0	86.8	36.0	19.2	-33.3
CL47
55	0.0008	24.9	9.2	33.1	18.3	21.3	6.7	-21.1
110	0.0006				21.1
170	0.0004	26.0	10.9	39.7	16.4	13.6	6.8	-22.9
230	0.0008				28.2
290	0.0008	21.9	10.0	40.2	13.8	14.8	10.0	-28.5
350	0.0009				44.7
410	0.0009	16.5	8.8	39.8	43.1	13.9	13.7	-32.1
470	0.0006	12.7	7.8	40.4	66.4	16.9	15.9	-34.0
530	0.0006	9.3	6.5	40.0	65.9	13.7	18.2	-34.7
590	0.0007	5.4	4.9	39.7	66.4	25.9	20.6	-38.2
650	0.0773	1.1	4.5	39.8	76.3	52.0	24.2	-38.8
710	0.7947	1.2	4.6	40.6	74.5	58.5	23.5	-37.4
770	0.7692	1.4			70.2		22.1	-32.1