鄂尔多斯盆地南部延长组时代划分及长7<sup>3</sup>对印支Ⅰ幕的响应

张文; 李玉宏; 张乔; 陈高潮; 韩伟; 赵峰华

doi:10.3799/dqkx.2017.1181

鄂尔多斯盆地南部延长组时代划分及长7³对印支Ⅰ幕的响应

doi: 10.3799/dqkx.2017.1181

张文^1,2,,
李玉宏^2, ,,
张乔²,
陈高潮²,
韩伟²,
赵峰华¹

1.
中国矿业大学地球科学与测绘工程学院, 北京 100083
2.
中国地质调查局西安地质调查中心, 陕西西安 710054

基金项目:

中国地质调查局矿产资源调查评价项目 No.12120113040300

中国地质调查局矿产资源调查评价项目 No.121201011000150014

国家自然科学基金 No.41202104

详细信息

作者简介:
张文(1994-), 女, 在读博士, 主要从事同位素地球化学及非常规油气地球化学研究

通讯作者:
李玉宏

中图分类号: P539;P542
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出版历程
- 收稿日期: 2016-12-11
- 刊出日期: 2017-09-15

Chronostratigraphic Division of Yanchang Formation in Southern Ordos Basin and Response of Chang 7³ to Episode Ⅰ of Indosinian Movement

1.
College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China
2.
Xi'an Geological Survey Center, China Geological Survey, Xi'an 710054, China

摘要

摘要: 鄂尔多斯盆地延长组地层时代划分存在较大分歧，即延长组地层时代是否包含中三叠世以及中、上三叠统界线的确定，而长7³地层的归属是其关键.针对争议采集了盆地南部何2井长7³底部凝灰岩（H2-2）和长7³中上部凝灰岩（H2-1）样品，对H2-2进行了锆石LA-ICP-MS U-Pb年代学和岩相学研究，对H2-1进行了岩相学和地球化学特征分析.结果表明：岩浆锆石的²⁰⁶Pb/²³⁸U加权年龄为239.8±2.0 Ma，属于中三叠世拉丁期，构造活动对应印支Ⅰ幕；凝灰岩来源于大陆花岗岩环境，与西秦岭地区的构造环境一致.结合前人研究成果，认为延长组地层跨中、晚三叠世，长7³地层属于延长组第2段并划归到中三叠统，其顶部（即"张家滩页岩"顶部）为中、上三叠统的分界.印支Ⅰ幕构造岩浆活动在盆地发育了延长组长7油层组及凝灰岩等事件沉积，西秦岭地区的花岗质岩浆活动与长7³凝灰岩在年龄、分布厚度、岩石组成和构造环境上均具耦合性，长7³凝灰岩有可能来自西秦岭的岩浆活动.
- 鄂尔多斯盆地 /
- 延长组 /
- 长7³ /
- 凝灰岩 /
- 时代划分 /
- 印支Ⅰ幕 /
- 地球化学
Abstract: The main controversies of Triassic Yanchang Formation in Ordos basin are focused on the following two aspects:whether the age of Yanchang Formation covers the Middle Triassic; the confirmation of stratigraphic boundary between Middle and Upper Triassic, especially the attribution of the Chang 7³. Therefore, the tuff samples of H2-2 and H2-1 were taken from the bottom and upper-middle Chang 7³ in H2 Well respectively. The chronological (zircon LA-ICP-MS U-Pb) and petrographical features of H2-2 and the petrographical and geochemical features of H2-1 are researched. The results indicate that the zircons in H2-2 belong to magmatic zircons and their weighted average ²⁰⁶Pb/²³⁸U ages are 239.8±2.0 Ma, which is classified into Middle Triassic Ladinian age and corresponds to Episode Ⅰ of Indosinian Movement. The tuff of Chang 7³ is derived from continental granite, in accordance with the tectonic setting of West Qinling region. Combined with previous results, it is thought that Yanchang Formation spans the Middle and Late Triassic epochs. Chang 7³ belongs the 2nd member of Yanchang Formation and its top surface (i.e. top surface of Zhangjiatan shale) is the boundary between Middle and Upper Triassic. The magma activities in Episode Ⅰ of Indosinian Movement brought about the Chang 7 oil group, the tuff and other event sediments in Ordos basin. And the granitic magma activities in West Qinling region are coupled with the tuff of Chang 7³ in distribution thickness, ages, magma features, and tectonic environment. It is likely that the tuff of Chang 7³ derives from the magma activities in West Qinling region.
- Ordos basin /
- Yanchang Formation /
- Chang 7³ /
- tuff /
- chronostratigraphic division /
- episode Ⅰ of indosinian movement /
- geochemistry

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图 1 鄂尔多斯盆地延长组地层划分对比

Fig. 1. Comparison of stratigraphic division of Yanchang Formation in Ordos basin

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图 2 鄂尔多斯盆地长7³底部凝灰岩厚度及采样点

凝灰岩厚度据邓秀芹等(2008, 2013)；锆石定年点据Xie(2007)、Wang et al.(2014)、张辉等(2014)

Fig. 2. Tuff thickness at the bottom of Chang 7³ and sample location

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图 3 凝灰岩锆石阴极发光照片及年龄(H2-2)

未标注年龄代表该点数据不可用；12号测点用²⁰⁷Pb/²⁰⁶Pb年龄(Black et al., 2003)，其余为²⁰⁶Pb/²³⁸U年龄

Fig. 3. CL images and ages of zircons from tuff (H2-2)

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图 4 锆石U-Pb年龄(a)及谐和图(b)

Fig. 4. Zircon ages (a) and U-Pb concordia diagram (b)

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图 5 凝灰岩镜下特征

a.H2-1薄片单偏光；b.H2-1薄片正交偏光；c.H2-1扫描电镜；d.H2-2扫描电镜

Fig. 5. Microphotographs of tuff

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图 6 H2-1 REE分布模式(a)、蜘蛛网图(b)、Th/Yb-Nb/Yb图(c)和Nb-Y图(d)

a和b图中球粒陨石和原始地幔数据采用Sun and McDonough(1989)的推荐值；c底图据Pearce and Peate(1995)；d底图据Pearce et al.(1984)

Fig. 6. Chondrite-nomalized REE patterns (a), primitive mantle-normalized trace element pattern (b), Th/Yb-Nb/Yb (c), and Y vs. Nb diagrams (d) of H2-1

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表 1 H2-1和H2-2的分析测试项目

Table 1. Test projects of H2-1 and H2-2

样品编号	采样层位	年代学特征	岩相学特征			地球化学特征
样品编号	采样层位	锆石U-Pb定年(LA-ICP-MS)	薄片	扫描电镜(SEM)	X射线衍射(XRD)	电感耦合等离子质谱(ICP-MS)
H2-1	长7³中上部		√	√	√	√
H2-2	长7³底部	√		√	√

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表 2 凝灰岩中锆石U-Pb年龄数据(H2-2)

Table 2. U-Pb isotopic data for obtained from tuff (H2-2)

测点号	Th/U	²⁰⁷Pb/²⁰⁶Pb(Ma)	1σ(Ma)	²⁰⁷Pb/²³⁵U(Ma)	1σ(Ma)	²⁰⁸Pb/²³²Th(Ma)	1σ(Ma)	²⁰⁶Pb/²³⁸U(Ma)	1σ(Ma)
1	0.70	258	44	238	7	257	10	236	4
2	0.82	257	62	241	10	235	13	240	5
3	0.80	237	63	242	9	253	12	243	5
4	0.89	494	658	273	83	244	23	247	8
5	0.64	251	117	237	17	223	27	236	9
6	0.77	236	42	234	7	226	9	234	4
7	0.75	251	48	243	8	247	11	243	4
8	0.75	237	48	242	7	259	10	243	4
9	0.88	263	80	244	12	249	16	242	6
10	0.75	248	52	240	8	234	11	240	5
11	0.52	233	273	246	42	184	64	248	20
12	0.62	1 983	54	1 967	23	1 948	26	1 951	24
14	0.64	240	86	243	12	217	20	244	6
15	0.60	290	54	243	9	209	13	238	5
16	0.53	232	239	243	31	357	57	245	11
18	0.96	249	68	240	10	217	13	240	6
19	0.50	237	37	239	6	261	11	239	4
21	0.73	251	73	240	10	271	15	239	5
22	0.76	264	84	242	13	223	16	240	6
25	0.63	260	79	238	12	281	19	236	6
26	0.62	246	154	241	23	340	39	241	11
28	0.57	282	39	247	7	245	11	243	4
29	0.95	256	46	241	7	248	9	240	4
30	1.49	243	66	240	10	218	9	240	5
31	0.51	239	55	236	8	225	14	236	5
32	0.72	358	101	330	20	325	34	326	11
33	0.48	284	184	239	28	225	47	234	14
34	0.73	266	85	246	13	284	20	244	7
35	0.52	273	36	240	6	225	10	237	4

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表 3 X射线衍射结果(%)

Table 3. Results of X-ray diffraction (%)

样品编号	石英	斜长石	铁白云石	菱铁矿	黄铁矿	伊利石1Md	绿泥石
H2-1	31.4	32.9	4.9	-	1.8	28.0	1.0
H2-2	34.2	-	-	4.0	0.8	59.0	2.0

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表 4 H2-1微量和稀土元素含量(10^-6)

Table 4. Concentration of trace elements and REE (H2-1, 10^-6)

元素	Li	Be	Sc	V	Cr	Co	Ni	Cu	Zn	Ga	Ge	Rb	Sr	Y
含量	20.2	9.52	4.80	27.3	7.02	2.47	17.9	7.54	69.1	37.5	1.25	70.2	156	30.1

元素	Zr	Nb	Mo	Cd	Cs	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb
含量	349	16.3	2.47	0.23	5.68	231	25.2	42.2	5.53	18.2	3.48	0.71	4.02	0.73

元素	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	W	Pb	Th	U
含量	4.78	1.06	3.16	0.51	3.56	0.51	10.3	2.61	1.30	66.1	24.7	6.33

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表 5 鄂尔多斯盆地长7凝灰岩锆石定年数据

Table 5. Ages of tuff in Chang 7 Formation in Ordos basin

采样位置	采样层位	U-Pb锆石年龄(Ma)	数据来源
何2井	长7底凝灰岩	239.8±2.0	本文
罗36井	长7底凝灰岩	241.3±2.4	Wang et al., 2014
庄211井	长7底凝灰岩	239.7±1.7	Wang et al., 2014
铜川金锁关(TB131)	长7底凝灰岩	240.7±0.8	Xie，2007
宁36井	长7段	236.1±2.7	张辉等，2014
正8井	长7段	234.3±2.8	张辉等，2014
正9井	长7段	234.9±2.6	张辉等，2014

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