漠河盆地额木尔河群锆石U-Pb年龄及地质意义

赵立国; 杨晓平; 赵省民; 刘渊; 张文龙

漠河盆地额木尔河群锆石U-Pb年龄及地质意义

1.
黑龙江省地质调查研究总院齐齐哈尔分院, 哈尔滨 150036
2.
中国地质调查局油气资源调查中心, 北京 100029

基金项目:

中国地质调查局天然气水合物资源勘查与试采专项"东北冻土区天然气水合物资源勘查项目" GZHL20120302

详细信息

作者简介:
赵立国(1965-), 男, 内蒙古通辽人, 高级工程师, 从事区域地质矿产调查及管理工作。E-mail:ZLG651102@163.com

中图分类号: P597
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- 被引次数: 0
出版历程
- 收稿日期: 2014-04-10
- 刊出日期: 2014-09-01

LA-ICP-MS U-Pb GEOCHRONOLOGY OF THE SEDIMENTARY ROCK AND VOLCANO ROCK ZIRCONS FROM THE EMOERHE GROUP IN THE MOHE BASIN AND ITS GEOLOGICAL SIGNIFICANCE

1.
Qiqihar Branch, Research Institute of Regional Geological Survey of Heilongjiang, Harbin 150036, China
2.
Oil and Gas Survey, CGS, Beijing 100029, China

摘要

摘要: 大兴安岭北部漠河盆地额木尔河群自下而上由绣峰组、二十二站组、漠河组和开库康组组成, 目前对额木尔河群形成时代还存在不同的认识。绣峰组含砾粗砂岩及二十二站组碎屑岩中流纹质凝灰岩夹层激光探针(LA-ICP-MS)锆石U-Pb测年结果表明, 绣峰组含砾粗砂岩中的碎屑锆石U-Pb年龄变化于距今2195~163 Ma之间, 暗示了源区有古元古代基底存在, 这一年龄数据与盆地周缘分布的基底岩石时代相吻合。碎屑锆石中5个最年轻锆石的²⁰⁶Pb/²³⁸U年龄加权平均值为167±2 Ma, 反映绣峰组沉积下限为中侏罗世中期; 二十二站组流纹质凝灰岩岩浆锆石²⁰⁶Pb/²³⁸U年龄加权平均值为148±2 Ma, 由此限定二十二站组形成时代为晚侏罗世晚期。锆石U-Pb年龄数据反映额木尔河群沉积时间为中-晚侏罗世, 这一认识对恢复漠河盆地形成演化历史及油气资源勘查提供了新的证据。
- 漠河盆地 /
- 额木尔河群 /
- 锆石U-Pb年龄
Abstract: Emoerhe Group in the Mohe Basin of northwestern Daxing'anling consists of Xiufeng Formation, Ershierzhan Formation, and Kaikukang Formation. Currently on Emoerhe Group's Formation age is still controversial. Study on the Zircon LA-ICP-MS U-Pb age of the Xiufeng Formation pebbly coarse sandstone sedimentary rock and interlayer of Rhyolitic tuff in Ershierzhan Formation clastic rock show that Xiufeng pebbly sandstone coarse detrital zircon U-Pb ages varied from 2195 Ma to 163 Ma. This alludes that the source region is Proterozoic-Middle Jurassic basement. The aging data of the basement rocks and the periphery of the basin are coincide. Detrital zircons in the five youngest zircon ²⁰⁶Pb/²³⁸U weighted mean age of (167±2) Ma. It reflects the sedimentary basin limit of early Late Jurassic. Ershierzhan Rhyolitic tuff magmatic zircons ²⁰⁶Pb/²³⁸U weighted mean age of (148±2) Ma which suggests the basin sedimentation occurred in the Late Jurassic Period. Zircon U-Pb age data reflect Emoerhe Group deposition time was in Late Jurassic. It provides new evidences to restore the Mohe Basin evolution and resources exploration.
- Mohe Basin /
- Emoerhe Group /
- U-Pb geochronology

HTML全文

图 1 漠河盆地地质简图与测年样品分布位置

1—上侏罗统—下白垩统火山岩盖层；2—上侏罗统开库康组；3—上侏罗统漠河组；4—上侏罗统二十二站组；5—中侏罗统绣峰组；6—古元古代—奥陶纪盆地基底；7—测年样品采样位置

Figure 1. A generalized geologic map of Mohe Basin and location of the samples

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图 2 锆石阴极发光图像及年龄

Figure 2. Zircon cathode luminescence images and ages

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图 3 锆石U-Pb年龄谐和图

Figure 3. Concordia diagrams of zircon U-Pb age

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表 1 绣峰组含砾粗砂岩与二十二站组流纹质凝灰岩锆石U-Pb同位素年龄测定结果

Table 1. Results of zircon U-Pb isotopic dating for gritstone in Xiufeng Formation and rhyolitic tuff in Ershierzhan Formation

测点	含量/(μg·g ^-1)		同位素原子比率							表面年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
绣峰组含砾粗砂岩(B2286)
1	6	33	1.62	0.1330	0.0012	2.0344	0.1039	0.1109	0.0057	805	7	1814	93
2	22	355	0.72	0.0624	0.0004	0.4687	0.0070	0.0545	0.0008	390	2	391	34
3	5	160	0.65	0.0288	0.0002	0.1979	0.0203	0.0499	0.0051	183	2	189	236
4	4	65	0.79	0.0556	0.0005	0.4083	0.0360	0.0533	0.0046	349	3	340	197
5	8	121	0.76	0.0625	0.0004	0.4663	0.0158	0.0541	0.0018	391	3	377	76
6	15	429	0.18	0.0363	0.0003	0.2540	0.0061	0.0508	0.0011	230	2	230	51
7	22	355	0.24	0.0624	0.0005	0.4678	0.0072	0.0543	0.0009	390	3	385	36
8	57	139	0.63	0.3770	0.0022	6.6344	0.0516	0.1276	0.0010	2062	12	2066	14
9	9	143	0.75	0.0554	0.0005	0.4074	0.0173	0.0534	0.0022	347	3	345	94
10	7	33	1.65	0.1320	0.0012	2.0897	0.1068	0.1148	0.0059	799	7	1877	93
11	6	102	0.69	0.0551	0.0005	0.4084	0.0322	0.0537	0.0041	346	3	360	174
12	49	858	0.56	0.0553	0.0003	0.4063	0.0043	0.0533	0.0006	347	2	341	24
13	22	326	0.42	0.0688	0.0004	0.5256	0.0071	0.0554	0.0008	429	3	429	31
14	1	36	0.89	0.0275	0.0005	0.2853	0.0568	0.0752	0.0171	175	3	1073	456
15	7	124	0.64	0.0553	0.0003	0.4087	0.0159	0.0536	0.0021	347	2	353	87
16	4	164	0.74	0.0262	0.0003	0.2191	0.0207	0.0606	0.0054	167	2	625	193
17	18	287	0.56	0.0620	0.0004	0.4652	0.0176	0.0544	0.0019	388	3	389	77
18	8	135	0.06	0.0621	0.0004	0.4664	0.0181	0.0544	0.0021	389	2	389	85
19	22	355	0.73	0.0619	0.0004	0.4655	0.0070	0.0545	0.0008	387	2	392	34
20	7	110	0.93	0.0624	0.0004	0.4648	0.0172	0.0540	0.0020	390	3	372	83
21	63	147	0.84	0.3997	0.0025	7.5733	0.0589	0.1374	0.0011	2168	13	2195	14
22	15	234	0.88	0.0623	0.0004	0.4677	0.0100	0.0545	0.0012	389	2	391	49
23	6	189	0.81	0.0298	0.0002	0.2054	0.0132	0.0499	0.0032	190	1	192	147
24	3	89	1.07	0.0284	0.0002	0.3503	0.0204	0.0895	0.0051	180	2	1416	108
25	10	159	0.67	0.0620	0.0005	0.4682	0.0336	0.0548	0.0039	388	3	403	158
二十二站组流纹质凝灰岩(B1153)
1	5	177	1.04	0.0236	0.0002	0.2549	0.0254	0.0785	0.0077	150	2	1159	194
2	9	362	0.78	0.0236	0.0002	0.1587	0.0121	0.0487	0.0036	151	1	135	174
3	15	463	1.86	0.0235	0.0002	0.3187	0.0181	0.0983	0.0050	150	1	1593	94
4	11	382	1.21	0.0239	0.0002	0.1589	0.0121	0.0482	0.0036	152	1	109	178
5	5	186	1.11	0.0233	0.0002	0.1595	0.0132	0.0496	0.0041	149	1	174	195
6	8	283	0.49	0.0235	0.0002	0.2969	0.0166	0.0915	0.0049	150	1	1457	102
7	8	297	0.72	0.0235	0.0002	0.2399	0.0142	0.0739	0.0041	150	1	1039	112
8	6	240	0.78	0.0237	0.0002	0.1588	0.0120	0.0485	0.0036	151	1	125	174
9	2	68	1.03	0.0236	0.0004	0.2330	0.0427	0.0718	0.0157	150	2	979	447
10	2	69	0.81	0.0235	0.0005	0.2545	0.0526	0.0784	0.0182	150	3	1157	462
11	7	250	0.74	0.0237	0.0002	0.1590	0.0089	0.0486	0.0027	151	1	129	132
12	5	177	1.02	0.0235	0.0002	0.2787	0.0277	0.0861	0.0084	150	2	1341	189
13	3	97	0.69	0.0238	0.0003	0.1587	0.0230	0.0483	0.0075	152	2	115	364
14	4	118	1.18	0.0236	0.0002	0.3128	0.0251	0.0963	0.0079	150	1	1553	154
15	3	111	0.61	0.0235	0.0002	0.2336	0.0247	0.0720	0.0080	150	1	985	226
16	4	135	0.78	0.0237	0.0002	0.1592	0.0188	0.0488	0.0059	151	1	136	285
17	3	112	0.80	0.0236	0.0002	0.2636	0.0227	0.0810	0.0073	150	1	1223	177
18	9	362	0.76	0.0232	0.0002	0.1588	0.0121	0.0496	0.0037	148	1	177	173
19	19	617	1.33	0.0241	0.0001	0.1595	0.0050	0.0481	0.0015	153	1	103	73
20	2	67	1.39	0.0236	0.0008	0.3375	0.0846	0.1037	0.0269	150	5	1692	479

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