Element Geochemistry and Vanadium Occurrence of the Dagoujing Black Shales, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2020.054

Abstract

Abstract:

Systematic analysis of ICP-AES, ICP-MS, XRD and EDS was carried out in this paper to discuss the occurrence and distribution of vanadium as well as formation and preservation conditions of the Dagoujing vanadium deposit in Inner Mongolia. The study showed that P₂O₅ contents ranged from 0.81% to 6.14%, and this high phosphor value indicates the enrichment of P in the strata; LOI values ranged from 7.75% to 41.24%, and this high value indicated that mica and argillaceous cement content were high in samples. Vanadium values ranged from 1,015.2×10^-6 to 4,162.0×10^-6, and all the data were much higher than the average composition of the crust. The black shales were classified as normal sedimentary rocks based on the U/Th values; V/Cr, Ni/Co, δU, δCe, Ce/La and V/(V+Ni) values as well as transformation of most of Fe in black shales into pyrite indicated that the black shales in this region formed in a relatively dry, anoxic, H₂S-rich, reducing and close basin condition. Vanadium element in samples mainly occurred in roscoelite, which was in very fine phosphorus shape with polytype 2M₁ and formula K(V,Al,Mg)₂ AlSi₃O₁₀(OH)₂. Occurrence of abundant single or aggregate pyrite in rocks created a favorable condition for vanadium enrichment and preservation in black shales.

Key words: occurrence and distribution, black shale, vanadium deposit, Dagoujing, Inner Mongolia

CLC Number:

P632

ZHANG Hongyu, SU Li, QIN Hong. Element Geochemistry and Vanadium Occurrence of the Dagoujing Black Shales, Inner Mongolia[J]. Geoscience, 2022, 36(01): 321-332.

Figures/Tables 11

References 28

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序号	样品编号	采样位置	岩石名称
1	Tc4-3-E1	4号探槽矿层东段	含炭粉砂质板岩
2	Tc4-3-E	4号探槽矿层东段	含炭粉砂质板岩
3	Tc4-3-X	4号探槽矿层下段	粉砂质板岩
4	Tc28-2-E1	28号探槽矿层东段	含炭粉砂泥岩
5	Tc28-2-E3	28号探槽矿层东段	含炭粉砂泥岩
6	Tc28-2-E5	28号探槽矿层东段	含炭粉砂泥岩
7	Tc12-2-X	12号探槽矿层下段	含炭千枚岩
8	Tc12-S	12号探槽矿层上段	含炭千枚岩
9	Tc12-Z	12号探槽矿层中段	含炭千枚岩
10	Zk001-1	1号钻孔113.09~117.09 m	含炭粉砂岩
11	Zk1802	18号钻孔76~80 m	炭质粉砂泥岩
12	Zk301	3号钻孔69.86~72.06 m	含炭粉砂岩
13	Zk501	5号钻孔30.19~31.34 m	含炭粉砂岩

序号	样品编号	采样位置	岩石名称
1	Tc4-3-E1	4号探槽矿层东段	含炭粉砂质板岩
2	Tc4-3-E	4号探槽矿层东段	含炭粉砂质板岩
3	Tc4-3-X	4号探槽矿层下段	粉砂质板岩
4	Tc28-2-E1	28号探槽矿层东段	含炭粉砂泥岩
5	Tc28-2-E3	28号探槽矿层东段	含炭粉砂泥岩
6	Tc28-2-E5	28号探槽矿层东段	含炭粉砂泥岩
7	Tc12-2-X	12号探槽矿层下段	含炭千枚岩
8	Tc12-S	12号探槽矿层上段	含炭千枚岩
9	Tc12-Z	12号探槽矿层中段	含炭千枚岩
10	Zk001-1	1号钻孔113.09~117.09 m	含炭粉砂岩
11	Zk1802	18号钻孔76~80 m	炭质粉砂泥岩
12	Zk301	3号钻孔69.86~72.06 m	含炭粉砂岩
13	Zk501	5号钻孔30.19~31.34 m	含炭粉砂岩

样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
Tc4-3-E1	51.77	0.57	9.03	7.57	0.04	1.21	5.79	0.7	3.03	2.35	13.46	95.52
Tc4-3-E	65.47	0.42	6.65	2.93	0.03	1.11	8.29	0.19	2.4	1.53	9.15	98.17
Tc4-3-X	60.28	0.70	8.73	3.12	0.02	1.44	8.69	0.22	3.43	2.19	7.75	96.58
Tc28-2-E1	65.45	0.82	7.10	5.60	0.01	0.99	4.52	0.25	3.08	1.81	9.02	98.66
Tc28-2-E3	34.65	0.29	3.65	5.64	0.02	0.38	16.09	0.16	0.85	6.14	21.54	89.40
Tc28-2-E5	50.45	0.42	5.91	5.61	0.03	0.81	9.45	0.19	1.96	3.96	16.10	94.90
Tc12-2-X	49.08	0.84	10.30	5.71	0.03	1.62	6.29	0.02	3.67	4.17	17.54	99.26
Tc12-S	63.54	0.91	10.14	6.45	0.03	1.41	3.04	0.20	4.24	0.81	8.54	99.31
Tc12-Z	52.51	0.52	7.96	10.92	0.02	1.27	6.73	0.40	4.16	1.84	11.89	98.20
Zk001-1	40.79	0.41	6.70	4.06	0.02	0.99	1.88	0.08	2.42	1.16	41.24	99.75
Zk1802	54.30	0.77	7.35	4.08	0.02	0.88	8.54	0.29	2.97	2.17	12.74	94.11
Zk301	42.19	0.34	6.75	3.68	0.03	1.50	2.74	0.05	2.49	1.10	38.04	98.90
Zk501	55.89	0.77	11.52	5.95	0.02	2.05	4.46	0.27	4.14	3.20	9.08	97.34

样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
Tc4-3-E1	51.77	0.57	9.03	7.57	0.04	1.21	5.79	0.7	3.03	2.35	13.46	95.52
Tc4-3-E	65.47	0.42	6.65	2.93	0.03	1.11	8.29	0.19	2.4	1.53	9.15	98.17
Tc4-3-X	60.28	0.70	8.73	3.12	0.02	1.44	8.69	0.22	3.43	2.19	7.75	96.58
Tc28-2-E1	65.45	0.82	7.10	5.60	0.01	0.99	4.52	0.25	3.08	1.81	9.02	98.66
Tc28-2-E3	34.65	0.29	3.65	5.64	0.02	0.38	16.09	0.16	0.85	6.14	21.54	89.40
Tc28-2-E5	50.45	0.42	5.91	5.61	0.03	0.81	9.45	0.19	1.96	3.96	16.10	94.90
Tc12-2-X	49.08	0.84	10.30	5.71	0.03	1.62	6.29	0.02	3.67	4.17	17.54	99.26
Tc12-S	63.54	0.91	10.14	6.45	0.03	1.41	3.04	0.20	4.24	0.81	8.54	99.31
Tc12-Z	52.51	0.52	7.96	10.92	0.02	1.27	6.73	0.40	4.16	1.84	11.89	98.20
Zk001-1	40.79	0.41	6.70	4.06	0.02	0.99	1.88	0.08	2.42	1.16	41.24	99.75
Zk1802	54.30	0.77	7.35	4.08	0.02	0.88	8.54	0.29	2.97	2.17	12.74	94.11
Zk301	42.19	0.34	6.75	3.68	0.03	1.50	2.74	0.05	2.49	1.10	38.04	98.90
Zk501	55.89	0.77	11.52	5.95	0.02	2.05	4.46	0.27	4.14	3.20	9.08	97.34

样品编号	Li	Sc	Ti	V	Cr	Mn	Co	Ni	Cu	Zn	Ga
Tc4-3-E1	31.98	12.12	3 210.00	3 362.00	153.30	270.20	34.64	475.80	47.44	114.50	14.88
Tc4-3-E	19.55	8.43	2 338.00	1 767.40	98.70	198.20	4.17	79.42	24.58	58.62	11.38
Tc4-3-X	17.86	9.30	2 754.00	2 362.00	116.30	96.20	1.05	60.38	27.50	28.94	11.82
Tc28-2-E1	17.77	11.70	4 188.00	1 355.80	142.60	99.36	2.65	106.80	67.76	110.50	11.92
Tc28-2-E3	6.72	5.61	1 423.00	774.60	60.16	104.10	0.62	13.19	22.92	49.90	5.76
Tc28-2-E5	16.73	13.24	2 194.00	1 469.60	84.16	178.40	5.85	116.30	33.12	76.10	9.18
Tc12-2-X	29.10	13.26	4 086.00	3 540.00	175.20	199.00	15.38	516.20	130.00	639.80	17.85
Tc12-S	38.04	10.12	4 624.00	1 806.00	156.10	226.80	13.52	391.60	98.72	553.00	15.51
Tc12-Z	26.86	12.30	2 916.00	1 015.20	127.30	183.10	4.06	112.50	41.16	139.80	16.74
Zk001-1	13.89	6.95	2 168.00	3 424.00	85.98	146.50	12.25	435.00	76.24	262.40	16.92
Zk1802	14.58	13.66	3 740.00	3 094.00	133.30	92.62	0.73	38.66	92.50	77.24	12.89
Zk301	24.02	8.37	1 994.20	2 544.00	73.14	202.20	10.91	386.20	42.32	269.00	14.12
Zk501	38.16	14.74	4 016.00	4 162.00	182.00	102.30	4.47	153.80	108.80	36.16	17.76
样品编号	Rb	Sr	Zr	Nb	Cs	Ba	Hf	Ta	Pb	Th	U
Tc4-3-E1	96.86	241.40	196.80	10.61	4.78	449.60	4.19	0.66	38.94	9.66	5.21
Tc4-3-E	84.04	169.60	153.70	8.20	4.08	345.80	2.94	0.50	15.80	4.98	2.32
Tc4-3-X	90.18	81.48	160.40	9.57	4.03	474.80	3.11	0.60	16.56	5.25	2.16
Tc28-2-E1	86.40	363.00	352.20	13.71	4.73	1 624.20	7.31	0.97	47.96	10.08	2.62
Tc28-2-E3	24.08	503.20	87.32	4.67	1.12	4 062.00	1.86	0.29	27.90	3.65	1.87
Tc28-2-E5	50.16	309.00	165.40	7.28	2.00	2 716.00	2.57	0.46	65.58	6.75	1.70
Tc12-2-X	115.90	311.40	301.80	14.34	6.81	1 485.00	6.17	0.90	24.10	10.87	3.73
Tc12-S	130.80	114.80	378.60	15.39	8.78	711.60	8.09	1.09	24.04	10.84	1.93
Tc12-Z	141.70	180.30	144.50	9.63	6.09	864.40	3.13	0.62	14.08	11.00	1.08
Zk001-1	66.04	103.50	106.40	10.63	2.22	2 336.00	2.02	0.46	32.32	5.14	8.54
Zk1802	93.70	85.84	211.40	13.05	8.28	1 059.80	4.22	0.78	30.22	8.31	4.51
Zk301	86.02	98.96	111.00	9.09	4.78	787.40	2.12	0.40	25.56	4.90	7.17
Zk501	127.00	194.40	287.20	14.62	4.18	3 706.00	5.81	0.90	27.86	10.48	3.57