鄂尔多斯盆地塔然高勒地区直罗组砂岩源区构造背景与物源分析

俞礽安; 朱强; 文思博; 涂家润; 彭胜龙; 司庆红; 唐永香

doi:10.3799/dqkx.2020.001

鄂尔多斯盆地塔然高勒地区直罗组砂岩源区构造背景与物源分析

doi: 10.3799/dqkx.2020.001

俞礽安^1,2, ,,
朱强^1,2,
文思博^1,2,
涂家润^1,2,
彭胜龙³,
司庆红^1,2,
唐永香⁴

1.
中国地质调查局天津地质调查中心, 天津 300170
2.
中国地质调查局铀矿地质重点实验室, 天津 300170
3.
内蒙古自治区煤田地质局, 内蒙古呼和浩特 010010
4.
天津地热勘查开发设计院, 天津 300250

基金项目:

中国地质调查局项目 DD20190119

国家重点研发计划项目 2018YFC0604200

详细信息

作者简介:
俞礽安(1980-), 男, 高级工程师, 主要从事矿产勘查和理论研究

中图分类号: P597
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出版历程
- 收稿日期: 2019-09-09
- 刊出日期: 2020-03-15

Tectonic Setting and Provenance Analysis of Zhiluo Formation Sandstone of Tarangaole Area in the Ordos Basin

1.
Tianjin Center of China Geological Survey, Tianjin 300170, China
2.
Key Laboratory of Uranium Geology of China Geological Survey, Tianjin 300170, China
3.
Coalfield Geological Bureau of Inner Mongolia, Hohhot 010010, China
4.
Tianjin Geothermal Exploration Institute, Tianjin 300250, China

摘要

摘要: 目前关于鄂尔多斯盆地塔然高勒地区直罗组沉积期物源和区域沉积-构造背景等问题尚缺研究，在一定程度上制约了直罗组物源变化的整体评价.对塔然高勒地区含铀层位直罗组下段砂岩进行了岩石地球化学、碎屑锆石U-Pb测年研究.结果显示，研究区直罗组下段源区岩石类型主要为长英质沉积岩和少量中性岩浆岩；源岩构造背景为活动大陆边缘-大陆边缘弧环境.综合微量、稀土元素特征和获得的锆石U-Pb定年数据，认为塔然高勒地区直罗组的物源主要来自大青山-乌拉山等地区的孔兹岩、TTG片麻岩、麻粒岩和镁铁质-超镁铁质层状侵入岩以及阴山地区形成于华力西期-印支期-燕山期的岩浆岩，直罗组下段砂体展布特征清楚地反映了研究区及相邻铀矿床由北向南的物源供给方向；研究区直罗组下段发现的三叠纪碎屑锆石表明三叠纪时期直罗组下段沉积时印支期侵入岩已被抬升至地表提供了物源，直罗组下段上亚段的年轻物源组分比例比下亚段的大.
- 鄂尔多斯盆地 /
- 直罗组 /
- 地球化学 /
- 锆石U-Pb定年 /
- 物源 /
- 构造背景
Abstract: Zhiluo Formation is located in Tarangaole area of the Ordos Basin and the research on the provenance and regional sedimentary structural setting remains weak, which restricts the overall evaluation of provenance change of Zhiluo Formationto some extent. Geochemical analysis and zircon U-Pb dating of sandstone in the lower Zhiluo Formation of uranium bearing horizon in Tarangaole area are applied in this paper. The results show that source rocks of the lower part of Zhiluo Formation are mainly felsic sedimentary rocks and few neutral magmatic rocks, and the tectonic setting of which is the active continental margin-continental margin arc environment. Based on the characteristics of trace and rare earth elements and zircon U-Pb dating results, it is considered that the sources of Zhiluo Formation in study area are mainly from Konzite, TTG gneiss, granulite and mafic-ultramafic layered intrusive rocks in Daqingshan-Wulashan area, and Variscan-Indosinian-Yanshanian period magmatic rocks of Yinshan area. The distribution of sandstones in the lower part of Zhiluo Formation clearly reflects the direction of source supply from north to south, the discovery of Triassic detrital zircons indicates that the Indosinian intrusive rocks have been uplifted bare surface to provide material source during the sedimentation of the lower part of Zhiluo Formation in Triassic, and the proportion of younger provenance components in the upper member is higher than that in the lower member of the lower part of Zhiluo Formation.
- Ordos Basin /
- Zhiluo Formation /
- geochemistry /
- zircon U-Pb dating /
- provenance /
- tectonic setting

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图 1 鄂尔多斯盆地北部区域地质简图

年龄数据主要据陈印等（2017）和雷开宇等（2017）

Fig. 1. Simplified map of northern Ordos Basin

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图 2 研究区直罗组岩石学特征

a.鄂尔多斯盆地东北部神山沟地区宏观地层露头；b.塔然高勒地区钻孔柱状图；c、d.塔然高勒地区直罗组下段中粗粒砂岩岩心、薄片.Qrt.石英；Pl.斜长石；Bit.黑云母

Fig. 2. Petrographic characteristics of Zhiluo Formation in study area

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图 3 研究区直罗组下段砂体等厚图

Fig. 3. Contour map of sand thickness of the lower part of Zhiluo Formation in study area

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图 4 研究区直罗组砂岩微量元素MORB标准化蛛网图(a)和稀土元素球粒陨石标准化配分模式(b)

图a、b中标准化数据分别据Pearce（1984）、Boynton（1984）

Fig. 4. MORB-normalized trace element spider diagram (a) and chondrite-normalized REE pattern (b) of sandstone of Zhiluo Formation in study area

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图 5 研究区直罗组砂岩碎屑锆石CL图（a、c）和LA-ICP MS U-Pb年龄谐和图（b、d）

图a、b为UZK45钻孔样品，图c、d为UZK50钻孔样品；图a、c中年龄单位为Ma

Fig. 5. CL images(a, c)and LA-ICP MS U-Pb concordia diagrams(b, d)of zircons from Zhiluo Formation sandstone in study area

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图 6 研究区直罗组砂岩碎屑锆石年龄与Th/U关系

Fig. 6. The relation between age and Th/U of detrital zircons from Zhiluo Formation sandstone in study area

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图 7 研究区直罗组砂岩碎屑锆石年龄谱

Fig. 7. Distribution histograms of detrital zircon ages from Zhiluo Formation sandstone in study area

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图 8 研究区直罗组砂岩F1-F2（a）和Hf-La/Th（b）源区环境判别图

Fig. 8. F1-F2 (a) and Hf-La/Th (b) discrimination diagrams of Zhiluo Formation sandstone in study area

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图 9 砂岩源区大地构造背景主量元素判别

Fig. 9. Major elements composition of sandstones for tectonic setting discrimination

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图 10 直罗组砂岩的Th-Sc-Zr/10和La-Th-Sc源区构造背景判别图

A.大洋岛弧；B.大陆岛弧；C.活动大陆边缘；D.被动大陆边缘

Fig. 10. Th-Sc-Zr/10 and La-Th-Sc diagrams of Zhiluo Formation sandstone for tectonic setting discrimination

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图 11 鄂尔多斯盆地直罗组砂岩锆石U-Pb年龄谱与邻区锆石年龄谱对比

图a据张龙等（2016）；图c据王盟等(2013)；图d~h据雷开宇等（2017）.图中n为统计年龄数

Fig. 11. Comparison of detrital zircon ages from Zhiluo Formation sandstone in the Ordos Basin with zircon ages of neighboring areas

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表 1 研究区直罗组砂岩主量元素分析结果(%)

Table 1. Major elements (%) analytical data of Zhiluo Formation sandstone from Ordos Basin

地区	编号	SiO₂	Al₂O₃	FeO	TFe₂O₃	CaO	CaO*	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	LOI	CIA*
塔然高勒	UZK4-1	66.72	14.29	1.38	6.13	0.75	0.75	1.77	3.38	1.95	0.67	0.13	0.09	4.12	70.15
塔然高勒	UZK4-2	71.45	12.42	2.38	3.09	1.81	1.81	1.45	3.32	1.58	0.58	0.10	0.07	4.04	64.92
塔然高勒	UZK4-3	66.58	13.81	1.21	5.78	0.94	0.94	1.59	3.48	1.92	0.56	0.11	0.10	5.14	68.54
塔然高勒	UZK4-8	61.25	12.55	0.93	6.13	5.62	1.97	1.74	2.85	1.78	0.45	0.09	0.21	7.32	67.62
塔然高勒	UZK4-10	53.09	9.02	0.27	1.78	16.60	1.97	0.78	2.30	1.73	0.34	0.09	0.34	13.92	62.51
塔然高勒	UZK16-2	74.65	12.23	1.40	2.65	1.11	1.11	1.12	3.38	1.97	0.40	0.08	0.04	2.39	65.44
塔然高勒	UZK16-3	73.42	12.98	1.29	2.94	0.92	0.92	1.09	3.53	2.15	0.56	0.09	0.04	2.27	66.29
塔然高勒	UZK16-4	63.86	11.31	1.66	8.50	1.38	1.38	0.92	2.98	1.85	1.00	0.13	0.08	8.00	64.55
塔然高勒	UZK27-1	69.10	14.22	2.22	4.15	0.64	0.64	2.29	3.31	2.08	0.82	0.15	0.05	3.17	70.22
塔然高勒	UZK27-2	69.68	13.51	1.51	3.67	1.03	1.03	1.31	3.16	3.54	0.63	0.13	0.06	3.29	63.61
塔然高勒	UZK27-4	74.42	12.07	1.02	2.11	1.50	1.50	1.00	3.65	2.12	0.31	0.08	0.05	2.70	62.41
塔然高勒	UZK4-6	72.30	11.93	0.68	1.60	3.08	3.08	0.97	3.32	1.78	0.34	0.08	0.07	4.56	59.32
OIA		58.83	17.11	5.52	1.95		5.83	3.65	1.60	4.10	1.06	0.26	0.15
CIA		70.69	14.04	3.05	4.82		2.68	1.97	1.89	3.21	0.64	0.16	0.10
ACM		73.86	12.89	1.58	3.06		2.48	1.23	2.90	2.77	0.46	0.09	0.10
PCM		81.95	8.41	1.76	3.28		1.89	1.39	1.71	1.07	0.49	0.12	0.05
UCC		66.60	15.4	5.04			3.59	2.48	2.80	3.27	0.64	0.15	0.10
注：为消除碳酸钙胶结物的影响，同时考虑到华北地区大部分TTG岩系及各类中酸性岩浆岩的CaO < 5%，取含量 < 5%的样品的平均值(1.97)作为含量 > 5%的样品的CaO含量，记作CaO^. OIA.洋岛，CIA.大陆岛弧，ACM.活动大陆边缘，PCM.被动大陆边缘；上述数据源自Bhatia（1983）.UCC.大陆上地壳，数据源自Rudnik et al.（2003）.LOI为烧失量；CIA^表示沉积岩物源区化学分异指数；CIA^＝[Al₂O₃/（Al₂O₃+CaO^+Na₂O+K₂O）]×100，式中各氧化物含量均为摩尔质量.

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表 2 研究区直罗组砂岩微量元素和稀土元素(10^-6)分析结果

Table 2. Trace elements (10^-6) and rare earth elements (10^-6) analytical data of Zhiluo Formation sandstone in study area

样品编号	塔然高勒												上地壳
样品编号	UZK 4-1	UZK 4-2	UZK 4-3	UZK 4-8	UZK 4-10	UZK 16-2	UZK 16-3	UZK 16-4	UZK 27-1	UZK 27-2	UZK 27-4	UZK 4-6	上地壳
Cu	16.40	7.95	14.40	12.40	6.63	8.49	9.42	16.00	13.10	11.80	4.77	6.63
Pb	13.3	15.7	13.9	14.9	11.0	59.4	19.0	20.9	43.0	10.9	11.6	13.4
Zn	60.5	32.1	39.8	37.5	25.3	21.1	40.0	43.5	52.2	33.7	14.3	37.5
Cr	69.7	58.0	68.7	54.4	28.8	29.7	41.9	56.0	78.4	49.1	22.2	29.3	35
Ni	17.8	11.5	17.0	17.1	10.2	9.4	11.6	23.7	20.2	16.9	8.4	9.6	20
Co	9.01	5.88	8.78	8.22	7.40	5.21	6.90	11.70	11.30	9.70	5.16	4.58	10
Li	27.3	17.9	26.2	21.6	9.2	11.0	14.0	11.9	35.4	15.9	10.3	10.6
Rb	98.1	89.1	99.3	79.2	58.1	86.3	97.1	82.3	102.0	94.9	90.1	85.6	110
Cs	2.78	2.11	2.55	2.16	1.40	1.18	1.44	1.56	1.76	1.37	1.23	1.48
Sr	242	295	241	227	277	336	317	318	219	213	292	302	350
Ba	941	1 040	922	742	801	533	775	686	357	659	832	978	700
V	74.3	145.0	82.4	64.1	36.1	71.3	48.7	95.0	189.0	64.4	31.4	34.6	60
Sc	9.91	6.20	8.92	10.00	7.46	6.68	6.33	5.89	6.04	8.33	6.07	7.40
Nb	12.80	10.70	11.60	8.29	5.82	7.35	9.86	19.10	14.20	11.10	6.29	6.54	25
Ta	0.88	0.69	0.76	0.54	0.38	0.43	0.60	1.05	0.84	0.68	0.39	0.45
Zr	275	187	222	197	106	123	183	495	340	323	103	104	240
Hf	7.75	5.38	6.08	5.48	2.97	3.58	5.24	13.30	9.30	9.24	3.02	3.12	5.8
Be	2.05	1.34	1.94	1.59	1.16	1.20	1.38	1.48	1.60	1.34	1.14	1.06
Ga	17.2	13.4	16.5	16.8	10.6	11.5	13.1	12.5	17.1	13.9	11.4	12.5
U	14.40	1.97	29.00	8.51	3.98	0.79	24.80	24.40	4.66	1.29	18.70	14.60	2.5
Th	6.66	6.24	6.08	6.49	3.45	2.25	2.83	7.63	3.24	3.52	1.78	3.63	10.5
La	34.40	35.10	29.60	42.20	30.30	8.51	7.83	24	14.8	11.1	6.61	21	30
Ce	48.9	57.0	37.8	55.6	47.0	16.6	15.1	67.1	41.2	25.6	14.1	32.8	64
Pr	8.04	7.34	6.38	8.55	6.02	2.31	2.16	5.83	3.13	3.34	1.83	4.76	7.1
Nd	29.00	25.90	21.80	30.40	21.90	8.97	8.25	22.10	11.40	13.40	7.39	17.30	26
Sm	4.63	4.12	3.15	4.94	3.62	1.66	1.52	3.81	1.81	2.55	1.48	2.82	4.5
Eu	1.01	1.11	0.79	1.29	1.09	0.81	0.73	0.99	0.46	0.77	0.79	0.88	0.88
Gd	3.45	3.37	2.63	3.99	3.27	1.42	1.34	3.55	1.80	2.09	1.24	2.28	3.8
Tb	0.49	0.49	0.36	0.56	0.46	0.20	0.19	0.52	0.23	0.31	0.20	0.32	2.2
Dy	2.49	2.60	1.86	2.88	2.41	1.14	1.13	2.88	1.14	1.55	1.13	1.60	3.5
Ho	0.48	0.50	0.38	0.56	0.48	0.22	0.23	0.57	0.22	0.30	0.22	0.31	0.8
Er	1.40	1.44	1.10	1.63	1.30	0.63	0.64	1.66	0.72	0.91	0.62	0.86	2.3
Tm	0.22	0.22	0.18	0.25	0.18	0.10	0.10	0.28	0.12	0.15	0.10	0.13	0.33
Yb	1.52	1.52	1.18	1.61	1.14	0.72	0.75	1.90	0.90	1.03	0.68	0.87	2.2
Lu	0.25	0.24	0.18	0.25	0.19	0.12	0.12	0.30	0.14	0.17	0.10	0.14	0.32
Y	11.60	12.40	9.45	14.00	14.40	5.11	5.33	14.60	5.60	6.98	5.53	7.77	22
(La/Yb)_N	15.26	15.57	16.91	17.67	17.92	7.97	7.04	8.52	11.09	7.27	6.55	16.27
Eu/Eu^*	0.77	0.91	0.84	0.89	0.97	1.61	1.56	0.82	0.78	1.02	1.78	1.06
(Sm/Nd）_N	0.49	0.49	0.44	0.50	0.51	0.57	0.57	0.53	0.49	0.59	0.62	0.50
(Gd/Yb）_N	1.83	1.79	1.80	2.00	2.31	1.59	1.44	1.51	1.61	1.64	1.47	2.11

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表 3 不同构造背景下砂岩的REE参数

Table 3. The REE geochemical parameters of sandstone in different tectonic settings

构造背景	物源区类型	La（10^-6）	Ce（10^-6）	ΣREE（10^-6）	La/ Yb	(La/Yb)_N	ΣLREE/ΣHREE	Eu/ Eu^*
大洋岛弧	未切割的岩浆弧	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	切割的岩浆弧	27±4.5	59±8.2	146±20	11±3.6	7.5±2.5	7.7±1.7	0.79±0.13
活动大陆边缘	基底隆起	37	78	186	12.5	8.5	9.1	0.60
被动大陆边缘	克拉通内构造高地	39	85	210	15.9	10.8	8.5	0.56
塔然高勒(n=12)		25.38	46.22	95.13	19.37	12.34	11.15	1.07

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参考文献(71)

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