REE Geochemistry and Its Environmental Significance of Subsurface Black Soil from Northwestern Arongqi, Songnen Plain Black Soil District

doi:10.19657/j.geoscience.1000-8527.2022.098

Abstract

Abstract:

Formation of black soil in Northeast China has long been a research focus in the academia, but anthropological activities have influenced the study of surficial black soil to varying degrees. At present, there is a paucity of research on the underground black soil. In this study, the black soil from drill-cores at Arongqi of the Songnen Plain was sampled for REE geochemical analysis. Distributions of ΣREE, HREE and LREE elements of the deep black soil layer were analyzed by geostatistics. Combined with the Ce anomaly, Eu anomaly, (La/Yb)_N, (La/Sm)_N, (Gd/Yb)_N, Al₂O₃ vs. TiO₂ diagram and Ce_anom, the provenance and formation environment of the black soil are discussed. The results show that the subsurface black soil at Arongqi have high ΣREE content (avg. 141.45 mg·kg^-1). The right-inclining chondrite-normalized patterns show LREE enrichments, with weak negative Eu and strong negative Ce anomalies. The average (La/Yb)_N =7.58, (La/Sm)_N=1.14, and (Gd/Yb)_N=3.54, indicating that the HREEs and LREEs are highly fractionated, and the LREE fractionation is stronger than that of HREE. The δEu and Al₂O₃/TiO₂ diagram indicate that the subsurface black soil was sourced from the nearby Cretaceous felsic-intermediate magmatic rocks. The Ce_anom >-0.1 (mean 3.9)suggests an anoxic environment.

Key words: black soil, environmental significance, rare earth element, Arongqi, provenance study

CLC Number:

P595
X142

DU Guanxin, YAN Baiquan, SUN Yu, QIAN Cheng, QIN Tao, ZANG Yanqing. REE Geochemistry and Its Environmental Significance of Subsurface Black Soil from Northwestern Arongqi, Songnen Plain Black Soil District[J]. Geoscience, 2023, 37(03): 813-820.

Figures/Tables 6

References 48

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序号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE	LREE	HREE	L/H	Al₂O₃	TiO₂
HT0-4-2	29.10	64.90	7.51	29.10	5.30	1.20	4.40	0.80	4.00	0.86	2.48	0.40	2.59	0.39	153.03	137.11	15.92	8.61	13.81	0.24
HT1-2-2	31.10	64.10	8.52	34.50	6.20	1.55	4.83	0.71	3.63	0.75	2.06	0.31	1.98	0.28	160.52	145.97	14.55	10.03	14.65	0.38
HT6-6-2	20.90	44.10	5.51	22.20	4.21	1.07	3.51	0.56	3.14	0.87	2.19	0.32	2.05	0.29	110.92	97.99	12.93	7.58	14.70	0.40
HT6-5-2	25.50	55.50	6.41	24.70	4.46	0.99	3.55	0.60	3.14	0.69	1.96	0.31	1.99	0.29	130.09	117.56	12.53	9.38	15.11	0.42
HT4-3-2	29.30	53.20	7.22	28.30	4.94	1.40	3.95	0.65	3.34	0.80	2.18	0.33	2.08	0.31	138.00	124.36	13.64	9.12	15.23	0.46
HT1-1-2	35.40	74.70	9.81	40.10	7.21	1.78	5.69	0.85	4.25	0.89	2.40	0.34	2.14	0.29	185.85	169.00	16.85	10.03	15.33	0.46
HT1-4-2	29.20	59.40	6.84	25.30	4.53	1.02	3.69	0.62	3.45	0.66	1.96	0.32	2.14	0.30	139.43	126.29	13.14	9.61	15.36	0.49
HT1-3-2	24.80	49.50	6.22	23.90	4.33	1.10	3.33	0.58	3.08	0.75	2.13	0.32	2.19	0.33	122.56	109.85	12.71	8.64	15.47	0.49
HT0-6-2	28.40	54.20	6.89	28.00	5.19	1.44	4.38	0.72	3.78	0.80	2.27	0.33	2.28	0.33	139.01	124.12	14.89	8.34	15.80	0.52
HT0-1-2	24.80	50.10	6.23	23.40	4.14	0.85	3.35	0.57	3.15	0.75	2.13	0.34	2.28	0.34	122.43	109.52	12.91	8.48	15.83	0.52
HT0-3-2	28.00	56.10	6.81	25.20	4.45	0.95	3.72	0.58	3.10	0.74	2.13	0.34	2.19	0.33	134.64	121.51	13.13	9.25	16.05	0.52
HT6-2-2	22.70	44.30	5.79	22.70	4.24	0.94	3.40	0.52	2.66	0.49	1.47	0.22	1.59	0.24	111.26	100.67	10.59	9.51	16.21	0.56
HT6-1-2	24.30	52.00	6.41	25.90	4.82	1.22	3.92	0.64	3.34	0.63	1.81	0.29	1.87	0.28	127.43	114.65	12.78	8.97	16.31	0.57
HT6-3-2	20.80	45.50	5.83	23.50	4.40	1.07	3.68	0.57	2.92	0.57	1.68	0.26	1.66	0.25	112.69	101.10	11.59	8.72	16.56	0.58
HT4-1-2	28.20	55.10	6.87	25.80	4.56	1.06	3.71	0.59	3.23	0.72	1.99	0.31	2.11	0.33	134.58	121.59	12.99	9.36	16.61	0.58
HT4-5-2	31.00	61.00	7.79	29.70	5.36	1.01	4.30	0.71	3.82	0.89	2.53	0.40	2.70	0.38	151.59	135.86	15.73	8.64	16.99	0.58
HT4-6-2	17.30	35.10	5.05	21.60	4.27	1.19	3.54	0.60	3.25	0.61	1.75	0.27	1.74	0.25	96.52	84.51	12.01	7.04	17.22	0.60
HT0-2-2	32.80	63.20	8.03	30.50	5.41	1.19	4.54	0.73	4.11	0.84	2.48	0.39	2.69	0.40	157.31	141.13	16.18	8.72	17.29	0.60
HT4A-1-2	33.00	62.50	8.49	33.20	5.68	1.36	4.78	0.76	4.22	0.95	2.68	0.41	2.83	0.43	161.29	144.23	17.06	8.45	17.32	0.62
HT4A-4-2	23.80	46.80	6.07	23.80	4.14	1.12	3.45	0.55	2.92	0.70	1.87	0.30	1.92	0.29	117.73	105.73	12.00	8.81	17.43	0.62
HT4A-3-2	36.20	70.10	9.86	40.90	7.74	2.12	6.44	1.03	5.25	1.13	3.10	0.44	2.87	0.40	187.58	166.92	20.66	8.08	17.50	0.64
HT4A-2-2	43.90	71.40	8.94	33.40	5.62	1.37	4.52	0.71	3.79	0.86	2.48	0.37	2.50	0.37	180.23	164.63	15.60	10.55	17.69	0.69
HT4A-5-2	36.30	81.00	8.68	32.90	6.08	1.31	5.24	0.86	4.66	1.04	2.92	0.45	2.93	0.42	184.79	166.27	18.52	8.98	17.79	0.75
HT6-7-2	29.90	59.80	7.61	28.80	5.13	1.18	4.06	0.66	3.34	0.74	2.04	0.33	2.08	0.33	146.00	132.42	13.58	9.75	17.88	0.75
HT6-4-2	23.10	46.20	6.00	24.10	4.57	1.19	3.77	0.62	3.07	0.60	1.76	0.29	1.86	0.27	117.40	105.16	12.24	8.59	18.24	0.76
HT4-2-2	29.80	58.70	7.48	28.80	5.03	1.20	3.99	0.64	3.45	0.75	2.12	0.31	2.13	0.31	144.71	131.01	13.70	9.56	18.32	0.79
HT2-4-2	27.50	56.30	6.95	26.70	4.86	1.32	3.95	0.63	3.54	0.84	2.29	0.36	2.34	0.33	137.91	123.63	14.28	8.66	18.38	0.88
HT2-3-2	32.00	62.70	7.83	29.50	5.27	1.16	4.43	0.72	3.82	0.80	2.28	0.35	2.41	0.36	153.63	138.46	15.17	9.13	18.56	0.97
HT1-5-2	25.80	51.20	7.34	30.80	5.98	1.54	4.95	0.81	4.40	1.02	2.73	0.40	2.49	0.36	139.82	122.66	17.16	7.15	18.74	1.00
HT2-2-2	26.40	53.30	6.51	24.50	4.29	1.01	3.68	0.62	3.28	0.65	2.03	0.33	2.16	0.31	129.07	116.01	13.06	8.88	19.07	1.01
HT1-6-2	34.80	67.50	8.50	31.30	5.50	0.79	4.65	0.80	4.37	0.87	2.61	0.43	2.90	0.43	165.45	148.39	17.06	8.70	19.28	1.12
HT0-5-2	28.20	54.90	6.79	25.20	4.30	1.03	3.56	0.57	3.18	0.65	1.95	0.31	2.11	0.32	133.07	120.42	12.65	9.52	19.29	1.20
检出限	0.010	0.010	0.010	0.010	0.010	0.003	0.010	0.003	0.003	0.003	0.003	0.003	0.010	0.003					0.020	0.020

序号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE	LREE	HREE	L/H	Al₂O₃	TiO₂
HT0-4-2	29.10	64.90	7.51	29.10	5.30	1.20	4.40	0.80	4.00	0.86	2.48	0.40	2.59	0.39	153.03	137.11	15.92	8.61	13.81	0.24
HT1-2-2	31.10	64.10	8.52	34.50	6.20	1.55	4.83	0.71	3.63	0.75	2.06	0.31	1.98	0.28	160.52	145.97	14.55	10.03	14.65	0.38
HT6-6-2	20.90	44.10	5.51	22.20	4.21	1.07	3.51	0.56	3.14	0.87	2.19	0.32	2.05	0.29	110.92	97.99	12.93	7.58	14.70	0.40
HT6-5-2	25.50	55.50	6.41	24.70	4.46	0.99	3.55	0.60	3.14	0.69	1.96	0.31	1.99	0.29	130.09	117.56	12.53	9.38	15.11	0.42
HT4-3-2	29.30	53.20	7.22	28.30	4.94	1.40	3.95	0.65	3.34	0.80	2.18	0.33	2.08	0.31	138.00	124.36	13.64	9.12	15.23	0.46
HT1-1-2	35.40	74.70	9.81	40.10	7.21	1.78	5.69	0.85	4.25	0.89	2.40	0.34	2.14	0.29	185.85	169.00	16.85	10.03	15.33	0.46
HT1-4-2	29.20	59.40	6.84	25.30	4.53	1.02	3.69	0.62	3.45	0.66	1.96	0.32	2.14	0.30	139.43	126.29	13.14	9.61	15.36	0.49
HT1-3-2	24.80	49.50	6.22	23.90	4.33	1.10	3.33	0.58	3.08	0.75	2.13	0.32	2.19	0.33	122.56	109.85	12.71	8.64	15.47	0.49
HT0-6-2	28.40	54.20	6.89	28.00	5.19	1.44	4.38	0.72	3.78	0.80	2.27	0.33	2.28	0.33	139.01	124.12	14.89	8.34	15.80	0.52
HT0-1-2	24.80	50.10	6.23	23.40	4.14	0.85	3.35	0.57	3.15	0.75	2.13	0.34	2.28	0.34	122.43	109.52	12.91	8.48	15.83	0.52
HT0-3-2	28.00	56.10	6.81	25.20	4.45	0.95	3.72	0.58	3.10	0.74	2.13	0.34	2.19	0.33	134.64	121.51	13.13	9.25	16.05	0.52
HT6-2-2	22.70	44.30	5.79	22.70	4.24	0.94	3.40	0.52	2.66	0.49	1.47	0.22	1.59	0.24	111.26	100.67	10.59	9.51	16.21	0.56
HT6-1-2	24.30	52.00	6.41	25.90	4.82	1.22	3.92	0.64	3.34	0.63	1.81	0.29	1.87	0.28	127.43	114.65	12.78	8.97	16.31	0.57
HT6-3-2	20.80	45.50	5.83	23.50	4.40	1.07	3.68	0.57	2.92	0.57	1.68	0.26	1.66	0.25	112.69	101.10	11.59	8.72	16.56	0.58
HT4-1-2	28.20	55.10	6.87	25.80	4.56	1.06	3.71	0.59	3.23	0.72	1.99	0.31	2.11	0.33	134.58	121.59	12.99	9.36	16.61	0.58
HT4-5-2	31.00	61.00	7.79	29.70	5.36	1.01	4.30	0.71	3.82	0.89	2.53	0.40	2.70	0.38	151.59	135.86	15.73	8.64	16.99	0.58
HT4-6-2	17.30	35.10	5.05	21.60	4.27	1.19	3.54	0.60	3.25	0.61	1.75	0.27	1.74	0.25	96.52	84.51	12.01	7.04	17.22	0.60
HT0-2-2	32.80	63.20	8.03	30.50	5.41	1.19	4.54	0.73	4.11	0.84	2.48	0.39	2.69	0.40	157.31	141.13	16.18	8.72	17.29	0.60
HT4A-1-2	33.00	62.50	8.49	33.20	5.68	1.36	4.78	0.76	4.22	0.95	2.68	0.41	2.83	0.43	161.29	144.23	17.06	8.45	17.32	0.62
HT4A-4-2	23.80	46.80	6.07	23.80	4.14	1.12	3.45	0.55	2.92	0.70	1.87	0.30	1.92	0.29	117.73	105.73	12.00	8.81	17.43	0.62
HT4A-3-2	36.20	70.10	9.86	40.90	7.74	2.12	6.44	1.03	5.25	1.13	3.10	0.44	2.87	0.40	187.58	166.92	20.66	8.08	17.50	0.64
HT4A-2-2	43.90	71.40	8.94	33.40	5.62	1.37	4.52	0.71	3.79	0.86	2.48	0.37	2.50	0.37	180.23	164.63	15.60	10.55	17.69	0.69
HT4A-5-2	36.30	81.00	8.68	32.90	6.08	1.31	5.24	0.86	4.66	1.04	2.92	0.45	2.93	0.42	184.79	166.27	18.52	8.98	17.79	0.75
HT6-7-2	29.90	59.80	7.61	28.80	5.13	1.18	4.06	0.66	3.34	0.74	2.04	0.33	2.08	0.33	146.00	132.42	13.58	9.75	17.88	0.75
HT6-4-2	23.10	46.20	6.00	24.10	4.57	1.19	3.77	0.62	3.07	0.60	1.76	0.29	1.86	0.27	117.40	105.16	12.24	8.59	18.24	0.76
HT4-2-2	29.80	58.70	7.48	28.80	5.03	1.20	3.99	0.64	3.45	0.75	2.12	0.31	2.13	0.31	144.71	131.01	13.70	9.56	18.32	0.79
HT2-4-2	27.50	56.30	6.95	26.70	4.86	1.32	3.95	0.63	3.54	0.84	2.29	0.36	2.34	0.33	137.91	123.63	14.28	8.66	18.38	0.88
HT2-3-2	32.00	62.70	7.83	29.50	5.27	1.16	4.43	0.72	3.82	0.80	2.28	0.35	2.41	0.36	153.63	138.46	15.17	9.13	18.56	0.97
HT1-5-2	25.80	51.20	7.34	30.80	5.98	1.54	4.95	0.81	4.40	1.02	2.73	0.40	2.49	0.36	139.82	122.66	17.16	7.15	18.74	1.00
HT2-2-2	26.40	53.30	6.51	24.50	4.29	1.01	3.68	0.62	3.28	0.65	2.03	0.33	2.16	0.31	129.07	116.01	13.06	8.88	19.07	1.01
HT1-6-2	34.80	67.50	8.50	31.30	5.50	0.79	4.65	0.80	4.37	0.87	2.61	0.43	2.90	0.43	165.45	148.39	17.06	8.70	19.28	1.12
HT0-5-2	28.20	54.90	6.79	25.20	4.30	1.03	3.56	0.57	3.18	0.65	1.95	0.31	2.11	0.32	133.07	120.42	12.65	9.52	19.29	1.20
检出限	0.010	0.010	0.010	0.010	0.010	0.003	0.010	0.003	0.003	0.003	0.003	0.003	0.010	0.003					0.020	0.020

数值类型	REE(10^-6)	LREE(10^-6)	HREE(10^-6)	LREE/HREE	La/Yb	La/Sm	Gd/Yb	δCe	δEu	Ce_anom
最小值	283.32	207.17	66.35	2.71	5.92	2.54	0.90	0.36	0.51	3.49
最大值	535.62	405.63	129.99	3.87	10.41	4.89	1.63	0.46	1.03	4.20
平均值	391.00	298.71	92.29	3.24	7.58	3.54	1.14	0.41	0.86	3.90

数值类型	REE(10^-6)	LREE(10^-6)	HREE(10^-6)	LREE/HREE	La/Yb	La/Sm	Gd/Yb	δCe	δEu	Ce_anom
最小值	283.32	207.17	66.35	2.71	5.92	2.54	0.90	0.36	0.51	3.49
最大值	535.62	405.63	129.99	3.87	10.41	4.89	1.63	0.46	1.03	4.20
平均值	391.00	298.71	92.29	3.24	7.58	3.54	1.14	0.41	0.86	3.90