二连盆地乌兰察布坳陷中部上白垩统赛汉组上段铀储层的成因及其对铀成矿的制约

刘阳; 罗宁; 李建敏; 余小林; 何少伟

doi:10.19509/j.cnki.dzkq.tb20250202

二连盆地乌兰察布坳陷中部上白垩统赛汉组上段铀储层的成因及其对铀成矿的制约

doi: 10.19509/j.cnki.dzkq.tb20250202

刘阳^{1, 2,},
罗宁^3, ,,
李建敏³,
余小林³,
何少伟¹

1 .
中陕核工业集团地质调查院有限公司，西安 710100
2 .
中国地质大学（武汉）环境学院，武汉 430078
3 .
中国石油华北油田分公司，河北任丘 062550

基金项目: 中国地质调查局天津地质调查中心项目（DD20240116-3）；中国石油华北油田分公司项目（HBYT-EL-2022-JS-179；HBYT-ZBZX-FWTP-2024-0598）

详细信息

作者简介:
刘阳：E-mail：529832520@qq.com

通讯作者:
E-mail：jhc_luon@petrochina.com.cn

中图分类号: P619.14
计量
- 文章访问数: 174
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2025-05-06
- 录用日期: 2025-06-24
- 修回日期: 2025-06-24
- 网络出版日期: 2025-06-24

Genesis of uranium reservoirs in the Upper Cretaceous Saihan Formation in the central Ulanqab Depression of the Erlian Basin and their constraints on uranium mineralization

LIU Yang^{1, 2
,},
LUO Ning^{3
, ,},
LI Jianmin³,
YU Xiaolin³,
HE Shaowei¹

1 .
China Shaanxi Nuclear Industry Group Geological Survey Institute Co., Ltd., Xi'an 710100, China
2 .
School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430078, China
3 .
PetroChina Huabei Oilfield Company, Renqiu Hebei 062550, China

More Information

Author Bio:
E-mail：529832520@qq.com

Corresponding author: E-mail：jhc_luon@petrochina.com.cn

摘要

摘要:
铀储层是砂岩型铀成矿基础，因此，研究铀储层的成因对于铀成矿作用及铀成矿潜力评价具有重要的意义。通过砂分散体系、沉积物碎屑组分、重矿物组合及元素组成等分析，对二连盆地乌兰察布坳陷中部赛汉组铀储层进行了成因分析。研究表明：砂岩中石英、长石、岩屑平均质量分数分别为51%，27%和12%；Fe₂O₃^T/K₂O和SiO₂/Al₂O₃平均值分别为0.12和8.61；CIA平均值为61.83；Eu/Eu*平均值为0.75；砂岩中主要重矿物23种，ATi平均值为35.2，ZGi平均值为48.8，ZTR值在24.2%～71.6%之间。以上特征表明，赛汉组砂岩类型为长石砂岩和岩屑砂岩，母岩主要为中酸性岩浆岩。物源区母岩化学风化强度中等，反映了温暖潮湿下较强的化学风化作用。物源区母岩构造背景主要为大陆边缘，物源主要来自苏尼特隆起。综合以上研究，认为二叠纪−三叠纪和白垩纪−侏罗纪时期在大陆边缘构造背景下，在苏尼特隆起区形成的中酸性花岗岩在温暖潮湿的气候背景下，经过较强的风化作用，形成的碎屑由流体携带向盆地内搬运，形成了赛汉组上段砂岩，砂岩本身有铀元素存在。经过后期铀成矿作用，铀元素富集形成砂岩型铀矿床。
- 二连盆地 /
- 赛汉组 /
- 铀储层 /
- 铀成矿作用
Abstract: Objective
The uranium reservoir is the foundation of sandstone-type uranium mineralization. Therefore, studying the genesis of uranium reservoirs is essential for understanding uranium mineralization processes and evaluating uranium mineralization potential.
Methods
This paper conducts a genetic analysis of the uranium reservoir in the Saihan Formation in the central part of the Ulanqab Depression in the Erlian Basin based on analyses of the sand dispersal system, detrital components of sediments, heavy mineral assemblages, and elemental composition.
Results
The study found that the average contents of quartz, feldspar, and rock fragments in the sandstone are 51%, 27%, and 12%, respectively. The average values of Fe₂O₃^T/K₂O and SiO₂/Al₂O₃ are 0.12 and 8.61, respectively, with an average CIA value of 61.83. The average Eu/Eu* value is 0.75. A total of 23 major heavy minerals were identified in the sandstone, with average ATi and ZGi values of 35.2 and 48.8, respectively, and ZTR values ranging between 24.2% and 71.6%.
Conclusions
These characteristics indicate that the sandstone types in the Saihan Formation are feldspathic sandstone and lithic sandstone, with the parent rocks primarily composed of intermediate-acidic magmatic rocks. The chemical weathering intensity of the parent rocks in the source area is moderate, reflecting strong chemical weathering under warm and humid conditions. The tectonic setting of the parent rocks in the source area is mainly continental margin, with the provenance primarily derived from the Sonid Uplift. Based on comprehensive analysis, it is concluded that during the Permian-Triassic and Jurassic-Cretaceous periods, intermediate-acidic granites formed in the Sonid uplift under a continental margin tectonic setting. Under warm and humid climatic conditions, these rocks underwent intense weathering, and the resulting detrital materials were transported by fluids into the basin, forming the uranium-bearing sandstone of the Upper Saihan Formation. Through subsequent uranium mineralization processes, the uranium was enriched and formed sandstone-type uranium deposits.
- Erlian Basin /
- Saihan Formation /
- uranium reservoir /
- uranium mineralization

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图 1 二连盆地构造分区图(a)及地层综合柱状图(b)^{[17, 21]}

BB. 渤海湾盆地；EB. 二连盆地；EGB. 东戈壁盆地；HB. 海拉尔盆地；OB. 鄂尔多斯盆地；SB. 松辽盆地；YB. 银额盆地；MOZ. 蒙古鄂霍次克线；U1. 巴彦乌拉铀矿床；U2. 芒来铀矿床；U3. 努和廷铀矿床；U4. 赛罕高毕铀矿床；U5.哈达图铀矿床；U6. 脑木根铀矿床；M-U. 泥岩铀矿床；S-U. 砂岩型铀矿床

Figure 1. Tectonic division map (a) and stratigraphic column (b) in the Erlian Basin^{[17, 21]}

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图 2 研究区赛汉组上段砂体等厚图(a)和含砂率图(b)

Figure 2. Sandstone thickness contour (a) and sandstone content map (b) of the Upper Member of Saihan Formation in the study area

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图 3 赛汉组砂岩镜下碎屑组分图版

a. 灰色砂岩，1-2井613.9 m；b. 红色砂岩，1-4井592.1 m；c. 含矿砂岩，1-15井652 m；d. 钾长石、多晶石英、单晶石英，1-1B1样品；e. 火山岩岩屑、多晶石英、单晶石英，1-4B3样品；f. 变质岩岩屑、单晶石英，1-20B5样品；g. 胶状黄铁矿与沥青铀矿，1-4TZ1样品；h. 黄铁矿与沥青铀矿，1-2TZ1样品；i. 草莓装黄铁矿与沥青铀矿，1-4TZ1样品。Gr. 砾石；Cs. 碳质条带；Qm. 单晶石英；Qp. 多晶石英；Kfs. 钾长石；Pl. 斜长石；Lv. 火山岩岩屑；Lm. 变质岩岩屑；Py. 黄铁矿；Or. 正长石；PIT. 沥青铀矿

Figure 3. Micro-photos for sandstones from the Sihan Formation, showing the detrital component

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图 4 赛汉组砂岩lg(Fe₂O₃^T/K₂O)−lg(SiO₂/Al₂O₃)(a)，微量元素(b)和稀土元素(c)标准化配分曲线

Sh-C-I. 含铁页岩；Sa-C-I. 含铁砂岩；Sh. 页岩；Ar. 长石砂岩；Su. 长石石英砂岩；Li-S. 岩屑砂岩；Gr. 杂砂岩；Sub. 岩屑石英砂岩；Qu-S. 石英砂岩；a底图据文献[35]；上地壳微量元素标准化值据文献[32]；球粒陨石稀土元素标准化值据文献[30]

Figure 4. Diagram of Fe₂O₃^T/K₂O-SiO₂/Al₂O₃ (a), trace element (b) and REE patterns (c) of sandstones from the Saihan Formation

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图 5 赛汉组砂岩的物源成分判别图

Figure 5. Discrimination diagrams of provenance composition of sandstones from the Saihan Formation

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图 6 赛汉组铀储层重矿物组合特征

Figure 6. Heavy mineral composition of uranium reservoir from the Saihan Formation

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图 7 赛汉组铀储层A-CN-K图

Figure 7. A-CN-K ternary diagram of uranium reservoir from the Saihan Formation

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图 8 赛汉组砂岩元素地球化学构造背景判别图

ARC. 岛弧；OIA. 大洋岛弧；CIA. 大陆岛弧；ACM. 主动大陆边缘；PM. 被动大陆边缘

Figure 8. Discrimination diagrams of tectonic setting for sandstones from the Saihan Formation

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图 9 赛汉组铀储层ZTR等值线图

Figure 9. ZTR contour map of the uranium reservoir from the Saihan Formation

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图 10 1-2井单井相图(a)、赛汉组铀储层沉积体系图(b)及剖面图(c)（LLD. 电阻率；GR. 自然伽马）

Figure 10. Phase diagram of single Well 1-2 (a); sedimentary system diagram (b) and profile (c) of uranium reservoir from the Saihan Formation

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图 11 赛汉组铀储层成因模式

Figure 11. Genetic model of uranium reservoir from the Saihan Formation

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图 12 赛汉组上段砂分散体系(a)、沉积相(b)与铀矿化的空间配置关系及砂岩型铀矿成矿模式图(c)

Figure 12. Sand dispersion system (a), sedimentary facies (b) and metallogenic model of sandstone type uranium deposits (c) in the Upper Member of the Saihan Formation

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表 1 赛汉组铀储层砂岩重矿物质量分数

Table 1. Heavy mineral contents of uranium reservoir sandstone in the Saihan Formation

样品编号	岩性	锆石	磷灰石	榍石	金红石	白钛石	锐钛矿	独居石	石榴石	十字石	电气石	铬尖晶石	绿帘石	钛铁矿	磁铁矿	重晶石	总计	ZTR	ATi	ZGi
样品编号	岩性	w_B/%																ZTR	ATi	ZGi
1-1-Z5	灰色粗砂岩	24.56	1.06	5.59	0.00	0.12	0.71	0.00	18.38	3.68	11.03	0.00	2.76	29.41	2.36	0.35	100.00	52.80	8.77	42.81
1-1-Z6	灰色粗砂岩	19.24	0.51	6.33	0.10	0.15	0.25	0.00	58.23	0.00	2.53	0.00	2.53	7.59	1.52	1.01	100.00	24.17	16.67	75.16
3-1-Z2	灰色含砾粗砂岩	16.04	0.11	0.00	1.03	0.23	0.46	0.15	23.80	0.31	1.53	0.04	0.00	54.47	0.00	1.83	100.00	41.48	6.98	59.73
3-1-Z3	灰色粗砂岩	32.94	2.04	0.00	0.00	0.08	0.08	0.39	9.10	0.00	0.39	0.00	1.73	52.08	1.18	0.00	100.00	71.55	83.87	21.64
3-1-Z4	浅灰色中砂岩	10.16	0.30	0.00	0.00	0.00	0.00	0.17	11.30	0.00	0.07	0.00	0.07	73.44	4.48	0.00	100.00	46.34	80.00	52.67
3-3-Z3	灰色中砂岩	16.29	1.61	6.36	0.24	0.87	0.20	0.31	9.85	0.00	1.10	0.00	3.35	56.15	3.67	0.00	100.00	45.08	59.35	37.68
1-15-Z3	灰色中砂岩	33.63	0.55	0.72	0.06	0.89	0.28	0.00	6.60	0.00	0.12	7.65	0.48	44.99	3.31	0.74	100.00	66.90	81.97	16.40
1-20-Z2	灰色细砂岩	53.95	0.11	0.00	0.27	0.27	1.07	0.54	14.71	0.00	0.38	1.45	9.77	14.81	2.68	0.00	100.00	67.26	22.22	21.42
1-20-Z3	灰色粗砂岩	9.31	0.09	0.00	0.04	0.00	0.09	0.15	14.18	0.00	0.30	0.30	1.78	69.40	3.56	0.80	100.00	35.83	23.08	60.35
1-18-Z1	灰色粗砂岩	34.22	0.15	0.10	0.34	0.10	0.34	0.68	31.51	0.00	0.68	0.15	5.42	23.72	1.94	0.68	100.00	47.68	17.65	47.94
1-18-Z2	灰色粗砂岩	24.63	0.00	0.00	0.00	0.12	0.48	0.24	24.03	0.00	1.43	1.85	1.91	42.32	2.99	0.00	100.00	48.18	0.00	49.39
1-2-Z2	灰色粗砂岩	16.08	0.02	0.00	0.26	0.09	0.17	0.09	22.07	0.44	0.15	0.74	2.07	56.00	0.51	1.31	100.00	38.15	10.53	57.85
1-2-Z3	灰色粗砂岩	15.77	0.06	0.00	0.12	0.12	0.09	0.31	37.41	0.53	1.86	1.58	4.21	35.87	1.98	0.09	100.00	28.66	3.23	70.35
注：ZTR=100×（w（锆石）+w（电气石）+w（金红石））/ w（总重矿物）；ATi=100×w（磷灰石）/（w（磷灰石）+w（电气石））；ZGi=100×w（石榴石）/（w（石榴石）+w（锆石））

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表 2 研究区赛汉组沉积物主量元素、微量稀土元素分析结果及相关元素比值

Table 2. Results of major, trace and rare earth elements analyses and related elemental ratios of sediment from the Saihan Formation in the study area

样品编号		3-1-H1	3-1-H3	3-1-H6	3-2-W1	3-3-H2	3-3-H4	1-2-H2	1-4-H7	1-13-H1	1-20-H6	1-18-H3	1-15-H3	1-3-H2	1-10-H2	1-9-H3	1-11-H2	1-12-H2	PAAS	UCC
SiO₂	w_B/%	73.90	74.54	75.67	76.17	82.79	78.80	79.27	78.50	69.29	77.35	81.08	83.52	76.56	82.52	82.97	81.68	83.84	62.80	66.60
TiO₂		0.26	0.19	0.18	0.14	0.11	0.12	0.21	0.12	0.07	0.20	0.11	0.09	0.11	0.19	0.11	0.10	0.13	1.00	0.60
Al₂O₃		10.43	11.67	9.68	9.08	8.76	9.52	10.37	10.14	6.23	11.57	9.22	8.65	8.15	8.89	8.42	8.85	8.81	18.90	15.40
Fe₂O₃^T		2.11	1.31	2.75	1.47	0.61	1.34	1.59	1.02	0.71	1.44	0.87	0.62	0.67	0.97	0.67	0.62	0.91	7.20	5.00
MnO		0.02	0.08	0.06	0.08	0.01	0.03	0.02	0.04	0.09	0.02	0.02	0.02	0.03	0.01	0.02	0.03	0.01	0.10	0.10
MgO		0.55	0.66	0.52	0.49	0.24	0.61	0.06	0.38	0.14	0.40	0.20	0.19	0.29	0.35	0.22	0.25	0.21	2.20	2.50
CaO		1.80	1.20	0.93	1.25	0.65	0.79	0.79	1.58	9.16	0.67	1.44	0.75	4.89	0.42	1.27	1.42	0.34	1.30	3.60
Na₂O		1.73	2.09	1.90	1.98	1.71	1.76	1.87	1.93	0.90	1.64	1.57	1.31	1.28	1.53	1.28	1.46	1.13	1.20	3.30
K₂O		3.13	3.22	3.08	3.28	2.79	3.13	2.89	3.00	2.29	2.85	3.14	2.80	2.73	3.10	2.86	3.11	2.89	3.70	2.80
P₂O₅		0.04	0.02	0.03	0.05	0.04	0.06	0.06	0.05	0.04	0.06	0.04	0.06	0.05	0.05	0.06	0.04	0.04	0.20	0.20
SO₃		0.08	0.08	0.08	3.40	0.43	0.38	0.19	0.13	0.04	0.15	0.15	0.12	0.11	0.13	0.14	0.07	0.13	−	−
FeO		0.10	0.24	0.14	0.15	0.08	0.14	0.68	0.21	0.12	0.24	0.60	0.10	0.12	0.17	0.10	0.14	0.17	−	−
Fe₂O₃		2.00	1.04	2.59	1.30	0.52	1.18	0.83	0.79	0.58	1.17	0.20	0.51	0.54	0.78	0.56	0.46	0.72	−	−
烧失量		5.54	4.57	4.56	2.45	2.07	3.45	2.86	3.56	10.60	3.83	2.61	2.08	5.56	2.26	2.50	2.75	2.11	−	−
总和		101.69	100.91	102.17	101.29	100.81	101.31	101.69	101.45	100.26	101.59	101.25	100.82	101.09	101.37	101.18	100.98	101.44
Al₂O₃/TiO₂		40.12	61.42	53.78	64.86	79.64	79.33	49.38	84.50	89.00	57.85	83.82	96.11	74.09	46.79	76.55	88.50	67.77	−	−
Fe₂O₃^T/K₂O		0.20	0.11	0.28	0.16	0.07	0.14	0.15	0.10	0.11	0.12	0.09	0.07	0.08	0.11	0.08	0.07	0.10	−	−
SiO₂/Al₂O₃		7.09	6.39	7.82	8.39	9.45	8.28	7.64	7.74	11.12	6.69	8.79	9.66	9.39	9.28	9.85	9.23	9.52	−	−
CIA		61.51	64.43	62.49	55.64	63.59	58.87	65.97	59.65	60.37	69.99	60.51	64.99	60.64	59.07	60.84	59.48	63.11	−	−
DF₁		−4.28	−4.48	−4.45	−5.68	−6.01	−5.87	−4.15	−4.66	−1.81	−4.17	−5.48	−6.11	−3.94	−6.58	−6.06	−5.99	−6.35	−	−
DF₂		0.81	1.34	0.40	1.24	0.34	0.41	0.90	1.21	2.05	0.18	0.99	−0.15	1.36	0.24	0.06	0.75	−0.54	−	−
Rb	w_B/ 10⁻⁶	88.50	97.10	93.20	116.00	85.00	87.50	83.90	93.10	72.80	123.00	111.00	91.60	94.00	107.00	81.30	103.00	106.00	160.00	84.00
Sr		138.20	126.30	190.20	487.60	207.00	177.50	174.20	186.30	159.10	176.40	159.60	157.60	166.00	111.70	167.30	149.80	128.20	200.00	320.00
Ba		564.20	549.90	645.20	1066.25	724.70	658.00	541.70	520.30	541.90	568.80	559.40	557.40	786.10	441.80	630.40	537.80	531.70	650.00	624.00
Pb		17.00	16.10	16.70	21.10	14.70	16.50	18.20	15.80	12.90	17.70	15.00	15.10	16.40	13.70	14.20	14.90	17.50	20.00	17.00
Zr		47.10	60.60	41.00	82.40	36.00	50.40	82.30	39.30	30.10	62.60	50.60	41.40	36.90	64.40	32.40	44.80	72.60	210.00	193.00
Hf		1.46	1.86	1.23	2.34	1.01	1.46	2.17	1.19	0.90	1.82	1.52	1.29	1.08	1.90	0.97	1.37	2.12	5.00	5.30
Y		14.51	9.78	10.50	22.30	8.08	11.40	14.40	9.63	16.00	11.80	11.50	11.40	8.14	16.10	8.79	11.20	17.50	27.00	21.00
Sc		2.72	3.23	2.84	3.47	2.36	3.39	5.64	2.85	1.95	3.60	2.38	2.34	2.45	3.24	2.24	2.42	3.29	16.00	14.00
V		48.80	19.10	14.00	17.40	15.20	17.90	56.60	26.30	33.20	25.40	74.00	30.50	20.50	38.20	12.40	17.00	19.60	150.00	97.00
Cr		9.65	13.70	11.70	15.10	8.00	24.30	30.00	10.50	8.60	14.10	7.05	5.20	13.10	14.00	6.30	5.70	9.90	110.00	92.00
Cu		4.26	5.14	4.32	4.53	4.41	5.25	7.78	3.56	3.57	5.18	3.20	4.96	4.76	7.40	3.90	4.37	6.63	50.00	28.00
Co		3.18	3.17	2.16	8.46	1.43	3.30	17.40	2.74	1.68	3.75	2.38	2.20	2.35	3.52	1.97	2.80	3.36	23.00	17.30
Ni		7.06	7.90	5.94	16.40	4.22	9.20	42.70	7.00	4.11	8.60	4.60	4.65	7.20	9.80	5.55	5.24	6.41	55.00	47.00
Zn		20.00	18.50	17.60	32.10	14.20	24.90	56.00	29.40	13.60	29.40	16.40	15.70	20.20	25.50	14.40	18.10	24.80	85.00	67.00
Th		6.30	10.00	4.20	7.10	14.50	6.00	8.50	7.50	8.20	7.90	6.80	9.10	4.50	9.70	6.20	11.60	5.10	7.84	14.6
La	w_B/ 10⁻⁶	24.51	16.17	15.60	47.00	13.60	15.80	14.60	16.40	16.30	21.00	20.60	20.00	16.60	27.70	16.30	21.90	31.10	38.20	31.00
Ce		43.68	30.78	30.00	107.00	25.80	28.80	29.00	30.40	32.60	38.90	41.20	40.60	33.30	55.00	32.50	43.10	59.20	79.60	63.00
Pr		5.47	3.78	3.64	10.80	3.20	3.58	3.58	3.74	3.79	4.71	4.70	4.56	3.89	6.32	3.64	4.91	6.95	8.80	7.10
Nd		18.93	13.96	13.21	38.40	11.20	12.90	13.30	13.20	13.60	16.50	16.40	16.10	13.70	22.40	13.10	17.40	24.60	33.90	27.00
Sm		3.43	2.49	2.47	6.82	2.05	2.50	2.63	2.40	2.68	2.89	2.90	2.87	2.44	3.94	2.37	3.00	4.35	5.60	4.70
Eu		0.61	0.61	0.85	1.09	0.49	0.57	0.59	0.57	0.56	0.65	0.56	0.57	0.58	0.65	0.54	0.57	0.69	1.10	1.00
Gd		2.88	2.05	2.04	5.02	1.60	1.90	2.20	1.79	2.39	2.14	2.08	2.08	1.80	2.93	1.69	2.27	3.17	4.70	4.00
Tb		0.48	0.32	0.35	0.82	0.28	0.34	0.42	0.31	0.45	0.37	0.36	0.37	0.29	0.50	0.29	0.37	0.55	0.80	0.70
Dy		2.64	1.72	1.84	4.04	1.45	1.93	2.38	1.63	2.48	1.98	1.88	1.93	1.40	2.67	1.54	2.01	2.83	4.70	3.90
Ho		0.58	0.38	0.42	0.79	0.30	0.40	0.51	0.34	0.52	0.41	0.38	0.39	0.28	0.54	0.30	0.40	0.58	1.00	0.80
Er		1.55	1.01	1.07	2.09	0.81	1.10	1.45	0.93	1.37	1.12	1.08	1.05	0.78	1.55	0.84	1.10	1.72	2.90	2.30
Tm		0.25	0.16	0.19	0.33	0.15	0.20	0.25	0.16	0.22	0.20	0.17	0.17	0.13	0.24	0.14	0.18	0.27	0.40	0.30
Yb		1.64	1.08	1.15	1.95	0.78	1.12	1.51	0.90	1.23	1.16	1.10	1.05	0.82	1.52	0.81	1.13	1.76	2.80	2.00
Lu		0.26	0.16	0.18	0.27	0.11	0.15	0.21	0.12	0.17	0.16	0.17	0.16	0.12	0.22	0.12	0.16	0.25	0.40	0.30
ΣREE		106.92	74.69	73.00	226.42	61.80	71.28	72.63	72.89	78.36	92.19	93.58	91.90	76.11	126.17	74.17	98.50	138.02	−	−
LREE/ HREE		13.43	14.42	13.05	21.00	14.99	12.62	9.79	15.59	11.17	16.07	17.22	16.96	18.99	16.44	17.40	17.41	16.34	−	−
Eu/Eu*		0.60	0.82	1.15	0.57	0.82	0.80	0.75	0.84	0.68	0.80	0.70	0.72	0.84	0.58	0.82	0.66	0.57	−	−
注：CIA=[Al₂O₃/(Al₂O₃+CaO+Na₂O+K₂O)]×100，式中为每种氧化物的摩尔质量，其中CaO为校正含量；DF₁=−1.773TiO₂+0.607Al₂O₃+0.76Fe₂O₃^T−1.5MgO+0.616CaO+0.509Na₂O−1.224K₂O−9.09; DF₂=0.445TiO₂+0.07Al₂O₃−0.25Fe₂O₃^T−1.142MgO+0.438CaO+1.475Na₂O+1.426K₂O−6.681；球粒陨石标准化依据文献[30]；Eu/Eu*=Eu_N/(Sm_N×Gd_N)^1/2；PAAS. 太古宙平均页岩，依据文献[31]；UCC. 上地壳，依据文献[32]；REE. 稀土元素；LREE. 轻稀土元素；HREE. 重稀土元素；下同

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表 3 赛汉组砂岩和不同构造背景砂岩的主要元素和稀土元素

Table 3. Major and rare earth elements of sandstones from the Saihan Formation and different tectonic settings

构造背景	来源类型	主量元素指标					稀土元素指标
		Fe₂O₃^T+MgO	TiO₂	Al₂O₃/ SiO₂	K₂O/ Na₂O	Al₂O₃/ (CaO+Na₂O)	La	Ce	∑REE	La/Yb	La_N/Yb_N	∑LREE/ ∑HREE	Eu/Eu^*
		w_B/%		Al₂O₃/ SiO₂	K₂O/ Na₂O	Al₂O₃/ (CaO+Na₂O)	w_B/10⁻⁶			La/Yb	La_N/Yb_N	∑LREE/ ∑HREE	Eu/Eu^*
大洋岛弧（OIA）	未切割岩浆弧	11.73	1.06	0.29	0.39	1.72	8±1.7	19±3.7	58±10	4.2±1.3	2.8±0.9	3.8±0.9	1.04±0.11
大陆岛弧（CIA）	切割岩浆弧	6.79	0.64	0.20	0.61	2.42	27±4.5	59±8.2	146±20	11.0±3.6	7.5±2.5	7.7±1.7	0.79±0.13
主动大陆边缘（ACM）	隆升基底	4.63	0.46	0.18	0.99	2.56	37	78	186	12.5	8.5	9.1	0.6
被动大陆边缘（PM）	克拉通内部构造高地	2.89	0.49	0.10	1.60	4.15	39	85	210	15.9	10.8	8.5	0.56
赛汉组铀储层砂岩（样品数N=17）		1.50	0.14	0.12	1.92	3.42	20.89	41.29	91.32	17.16	12.31	15.46	0.75
注：不同构造背景砂岩中主要元素的参数引自文献[42-43]，La_N/Yb_N 和 Eu/Eu*参数引自文献[30, 37]；REE参数引自文献[44]

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