西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义

张耀玲; 沈燕绪; 吴珍汉; 赵珍

doi:10.12090/j.issn.1006-6616.2018.24.01.014

西藏改则地区美苏组岩浆岩锆石U-Pb年龄及地质意义

doi: 10.12090/j.issn.1006-6616.2018.24.01.014

张耀玲^{1, 2,},
沈燕绪³,
吴珍汉⁴,
赵珍⁴

1.
中国地质大学(北京), 北京 100083
2.
中国地质科学院地质力学研究所, 北京 100081
3.
国土资源实物地质资料中心, 河北三河 065201
4.
中国地质科学院, 北京 100037

基金项目:

中国地质科学院地质力学研究所基本科研业务费项目 DZLXJK201508

中国地质调查局项目 1212011220903

详细信息

作者简介:
张耀玲(1984-), 女, 博士研究生, 助理研究员, 从事火山岩与新构造研究。E-mail:yaoling_zhang@126.com

中图分类号: P588.1;P597.3
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- 被引次数: 0
出版历程
- 收稿日期: 2017-08-01
- 修回日期: 2017-12-01
- 刊出日期: 2018-02-01

ZIRCON U-PB AGES OF MAGMATIC ROCKS FROM MEISU FORMATION IN GERZE AREA IN TIBET AND ITS GEOLOGICAL SIGNIFICANCE

1.
China University of Geoscience, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China
3.
Cores and Samples Center of Land & Resources, Sanhe 065201, Hebei, China
4.
Chinese Academy of Geological Science, Beijing 100037, China

摘要

摘要: 西藏中部南羌塘改则盆地美苏组由砖红色砂砾岩和火山岩夹层组成，一些学者在美苏组建组剖面等地获得古新世-始新世的K-Ar年龄（34.0~69.1Ma），目前对其形成时代还缺少可靠的年代学约束。应用激光烧蚀多接收器电感耦合等离子体质谱仪（LA-MC-ICP-MS）方法，对改则盆地美苏组沉积地层中的流纹岩、石英粗安岩和花岗斑岩中锆石进行了U-Pb同位素测定。结果表明，改则盆地美苏组红层中的三个火山岩样品及一个侵入岩样品岩浆锆石²⁰⁶Pb/²³⁸U年龄分别为38.3±0.5 Ma、39.0±0.3 Ma、37.4±0.4 Ma、38.8±0.6 Ma，从而限定了该地区美苏组沉积时代为始新世晚期。改则地区美苏组岩浆岩形成时代为班公湖-怒江缝合带调节印度-欧亚大陆碰撞之后高原内部刚性块体向东"逃逸"而重新活动提供了年代学证据。
- 岩浆岩 /
- U-Pb年龄 /
- 美苏组 /
- 西藏 /
- 始新世
Abstract: The Meisu Formation exposed in Gerze basin of southern Qiangtang, middle Tibet, is composed of red sandstones and conglomerates with volcanic rock interlayers. At present, its formation age is still lack of reliable geochronologic constraints as other researchers only acquired Paleocene-Eocene K-Ar ages(34.0~69.1 Ma) from type section and other places of Meisu Formation. Laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) method is used to determinate zircon U-Pb isotope from rhyolite, quartz trachyandesite, and granite secondary volcanic rock of sedimentary strata of Meisu Formation in Gerze basin. The results indicate that the average ²⁰⁶Pb/²³⁸U age of magma zircons of 3 volcanic samples and 1 intrusive rock sample are respectively 38.3±0.5 Ma, 39.0±0.3Ma, 37.4±0.4 Ma and 38.8±0.6 Ma, which defines the formation age of Meisu Formation of this area is late Eocene. The forming age of Meisu Formation of Gerze area provides chronological evidence of reactivation of Bangonghu-Nujiang Suture to regulate internal rigid block of Tibet Plateau "escape" to the East after India-Eurasia continental collision.
- magmatic rock /
- U-Pb age /
- Meisu Formation /
- Tibet /
- Eocene

HTML全文

图 1 研究区地质简图

a—青藏高原西南部构造单元划分简图；b—改则地区地质简图JSSZ-金沙江缝合带；BNSZ-班公湖—怒江缝合带；SNMZ-狮泉河—纳木错蛇绿混杂岩带；LMF-洛巴堆—米拉山断裂；IYZSZ-印度—雅鲁藏布缝合带

Figure 1. Geological map of the research area

下载: 全尺寸图片幻灯片

图 2 美苏组综合地层柱状图

Figure 2. General stratigraphic column of Meisu Formation

下载: 全尺寸图片幻灯片

图 3 野外露头照片与样品显微图像

Figure 3. Outcrop pictures and photomicrographs of dating samples

下载: 全尺寸图片幻灯片

图 4 锆石CL图像与部分测点数据

Figure 4. Cathodoluminescence(CL)images of zircons and data from samples

下载: 全尺寸图片幻灯片

图 5 锆石U-Pb谐和图

Figure 5. Isotopic concordance of zircon U-Pb

下载: 全尺寸图片幻灯片

表 1 锆石U-Pb同位素测年结果

Table 1. Zircon U-Pb isotope dating data

测点	Pb	U	Th/U	同位素原子比率							表面年龄/Ma
测点	μg·g^-1		Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ		²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
B13020-1(流纹岩)
1	5	768	0.79	0.0062	0.0001	0.0410	0.0025	0.0482	0.0029		40	1	41	2	108	141
2	2	214	0.78	0.0061	0.0001	0.0408	0.0056	0.0486	0.0071		39	1	41	6	127	344
3	1	137	1.18	0.0062	0.0001	0.0431	0.0094	0.0504	0.0135		40	1	43	9	214	621
4	1	132	1.33	0.0062	0.0001	0.0406	0.0084	0.0475	0.0104		40	1	40	8	73	521
5	5	727	0.98	0.0059	0.0001	0.0396	0.0028	0.0485	0.0035		38	1	39	3	125	168
6	5	751	0.84	0.0060	0.0001	0.0430	0.0022	0.0516	0.0026		39	1	43	2	270	114
7	1	180	1.57	0.0062	0.0002	0.0406	0.0240	0.0478	0.0804		40	2	40	24	88	3988
8	1	116	1.52	0.0062	0.0002	0.1275	0.0196	0.1480	0.0235		40	1	122	19	2323	272
9	1	170	1.06	0.0058	0.0001	0.0423	0.0084	0.0532	0.0114		37	1	42	8	339	485
10	4	621	1.16	0.0058	0.0001	0.0428	0.0016	0.0532	0.0019		37	1	43	2	339	80
11	4	632	1.42	0.0060	0.0001	0.0398	0.0031	0.0483	0.0037		38	1	40	3	114	183
12	5	750	0.97	0.0056	0.0001	0.0437	0.0030	0.0564	0.0039		36	1	43	3	466	153
13	3	420	1.36	0.0059	0.0001	0.0445	0.0011	0.0548	0.0012		38	1	44	1	403	49
15	1	127	0.86	0.0060	0.0002	0.0427	0.0057	0.0516	0.0075		39	1	42	6	267	334
16	1	156	1.66	0.0062	0.0004	0.0397	0.0138	0.0465	0.0239		40	2	40	14	24	1232
17	3	465	1.22	0.0062	0.0002	0.0399	0.0188	0.0470	0.0246		40	1	40	19	47	1252
18	3	364	1.25	0.0062	0.0004	0.0414	0.0202	0.0485	0.0328		40	2	41	20	124	1590
19	1	106	1.48	0.0060	0.0005	0.0403	0.0133	0.0483	0.0318		39	3	40	13	113	1552
20	1	160	1.11	0.0069	0.0003	0.1301	0.0142	0.1369	0.0245		44	2	124	14	2188	311
21	2	218	0.86	0.0063	0.0003	0.0403	0.0157	0.0465	0.0431		40	2	40	16	25	2220
22	3	443	1.13	0.0060	0.0002	0.1020	0.0094	0.1237	0.0126		38	1	99	9	2010	181
23	4	427	0.75	0.0081	0.0002	0.2123	0.0076	0.1894	0.0067		52	1	195	7	2737	59
24	3	343	0.89	0.0079	0.0002	0.1414	0.0115	0.1295	0.0101		51	2	134	11	2091	138
25	1	176	1.18	0.0062	0.0003	0.0414	0.0116	0.0486	0.1427		40	2	41	12	128	6912
B13021-1(流纹岩)
1	2	268	0.69	0.0062	0.0001	0.0394	0.0038	0.0464	0.0046			40	1	39	4	21	240
2	1	202	0.92	0.0060	0.0001	0.0406	0.0043	0.0491	0.0052	38		1	40	4	155	249
3	0	62	1.18	0.0061	0.0002	0.0437	0.0070	0.0523	0.0090	39		1	43	7	296	392
4	2	197	1.04	0.0062	0.0001	0.0413	0.0044	0.0481	0.0052	40		1	41	4	106	254
5	2	290	0.60	0.0061	0.0001	0.0422	0.0031	0.0501	0.0037	39		1	42	3	198	173
6	2	219	0.81	0.0062	0.0001	0.0412	0.0058	0.0485	0.0068	40		1	41	6	123	331
7	1	106	0.78	0.0060	0.0001	0.0405	0.0096	0.0490	0.0120	39		1	40	10	146	575
8	2	287	0.73	0.0060	0.0001	0.0420	0.0035	0.0504	0.0040	39		1	42	3	213	185
9	3	457	0.84	0.0061	0.0001	0.0425	0.0022	0.0508	0.0026	39		1	42	2	230	117
10	1	194	0.98	0.0064	0.0001	0.0423	0.0022	0.0478	0.0024	41		1	42	2	87	119
11	1	94	1.44	0.0060	0.0001	0.0426	0.0085	0.0519	0.0117	38		1	42	8	282	515
12	2	249	1.54	0.0062	0.0001	0.0429	0.0036	0.0506	0.0042	40		1	43	4	223	191
13	1	128	1.23	0.0061	0.0001	0.0377	0.0043	0.0450	0.0054	39		1	38	4	55	292
14	3	475	0.99	0.0059	0.0001	0.0397	0.0021	0.0486	0.0025	38		1	40	2	128	120
15	2	318	1.11	0.0060	0.0001	0.0434	0.0038	0.0526	0.0047	38		1	43	4	313	201
16	3	193	1.04	0.0096	0.0001	0.4151	0.0138	0.3145	0.0101	61		1	353	12	3543	49
17	4	567	0.92	0.0062	0.0001	0.0432	0.0029	0.0507	0.0034	40		1	43	3	227	157
18	5	734	1.55	0.0061	0.0001	0.0444	0.0032	0.0532	0.0038	39		1	44	3	336	163
19	2	296	1.15	0.0061	0.0001	0.0419	0.0022	0.0502	0.0026	39		1	42	2	203	120
20	3	409	0.68	0.0060	0.0001	0.0390	0.0033	0.0472	0.0038	39		1	39	3	60	190
21	3	415	0.68	0.0060	0.0001	0.0432	0.0030	0.0526	0.0036	38		1	43	3	310	155
22	1	178	0.89	0.0060	0.0002	0.0419	0.0099	0.0505	0.0123	39		1	42	10	219	562
23	3	452	0.86	0.0060	0.0001	0.0417	0.0032	0.0507	0.0039	38		1	42	3	229	177
24	4	521	1.02	0.0059	0.0001	0.0417	0.0038	0.0510	0.0045	38		1	42	4	243	205
25	25	548	0.77	0.0188	0.0003	1.4924	0.0332	0.5746	0.0074	120		2	927	21	4445	19
26	3	457	0.83	0.0061	0.0001	0.0416	0.0035	0.0493	0.0042	39		1	41	4	164	198
B13023-1(石英粗安岩)
1	3	515	0.70	0.0060	0.0001	0.0489	0.0036	0.0589	0.0043		39	0	48	4	563	158
2	4	367	0.88	0.0078	0.0001	0.2428	0.0127	0.2254	0.0091		50	1	221	12	3020	65
3	4	478	1.04	0.0063	0.0001	0.0981	0.0063	0.1135	0.0066		40	1	95	6	1856	104
4	3	394	0.81	0.0060	0.0001	0.0656	0.0057	0.0795	0.0068		38	0	64	6	1185	169
5	4	361	0.86	0.0070	0.0001	0.1774	0.0077	0.1834	0.0069		45	1	166	7	2684	62
6	3	308	0.88	0.0072	0.0001	0.2055	0.0118	0.2078	0.0097		46	1	190	11	2888	76
7	3	370	0.75	0.0064	0.0001	0.1071	0.0062	0.1222	0.0066		41	0	103	6	1989	96
8	2	206	0.75	0.0073	0.0001	0.2006	0.0149	0.2005	0.0132		47	1	186	14	2830	107
9	2	332	0.81	0.0061	0.0001	0.0498	0.0075	0.0590	0.0091		39	0	49	7	568	336
10	3	380	0.72	0.0067	0.0001	0.1308	0.0092	0.1411	0.0084		43	1	125	9	2241	103
11	4	402	0.79	0.0073	0.0001	0.1985	0.0113	0.1962	0.0087		47	1	184	10	2795	73
12	5	471	0.95	0.0073	0.0001	0.1918	0.0085	0.1914	0.0071		47	1	178	8	2754	61
13	3	401	0.93	0.0062	0.0001	0.0765	0.0057	0.0889	0.0065		40	1	75	6	1403	140
14	3	390	0.99	0.0066	0.0001	0.1199	0.0065	0.1320	0.0064		42	1	115	6	2125	85
15	3	479	0.95	0.0059	0.0001	0.0399	0.0035	0.0487	0.0042		38	0	40	3	134	204
16	2	364	1.00	0.0060	0.0001	0.0403	0.0048	0.0489	0.0060		38	0	40	5	144	288
17	3	354	1.38	0.0059	0.0001	0.0754	0.0061	0.0931	0.0075		38	0	74	6	1490	152
18	2	361	1.19	0.0056	0.0001	0.0569	0.0052	0.0731	0.0067		36	0	56	5	1016	185
19	4	522	1.17	0.0059	0.0001	0.0623	0.0041	0.0765	0.0048		38	0	61	4	1108	126
20	2	267	1.12	0.0059	0.0001	0.0387	0.0066	0.0475	0.0086		38	0	39	7	73	429
21	3	379	1.13	0.0059	0.0001	0.0536	0.0053	0.0659	0.0065		38	0	53	5	803	205
22	6	760	1.18	0.0059	0.0001	0.0551	0.0026	0.0677	0.0032		38	0	54	3	860	99
23	2	348	0.99	0.0058	0.0001	0.0422	0.0050	0.0531	0.0064		37	0	42	5	331	275
24	4	586	1.12	0.0058	0.0001	0.0442	0.0035	0.0549	0.0043		38	0	44	3	409	175
B13022-1(花岗斑岩)
1	1	121	1.29	0.0073	0.0002	0.1097	0.0093	0.1152	0.0461		47	2	106	26	1883	2025
2	1	106	1.26	0.0072	0.0002	0.1214	0.0070	0.1180	0.0084		46	1	116	20	1927	336
3	1	111	1.11	0.0060	0.0002	0.0417	0.0114	0.0500	0.0261		39	1	41	11	196	1213
4	2	258	0.85	0.0059	0.0001	0.0431	0.0052	0.0530	0.0068		38	1	43	5	328	293
5	1	81	1.06	0.0070	0.0002	0.1025	0.0072	0.1001	0.0091		45	1	99	18	1626	388
6	1	121	1.47	0.0066	0.0001	0.0684	0.0067	0.0756	0.0085		42	1	67	12	1083	392
7	2	224	1.12	0.0062	0.0001	0.0416	0.0080	0.0483	0.0093		40	1	41	8	112	455
8	2	69	1.71	0.0126	0.0003	0.7652	0.0308	0.4395	0.0156		81	2	577	23	4050	53
9	1	180	1.61	0.0063	0.0001	0.0433	0.0061	0.0498	0.0075		41	1	43	6	185	351
10	1	92	1.30	0.0059	0.0002	0.0388	0.0186	0.0479	0.0280		38	1	39	18	92	1387
11	1	126	1.46	0.0059	0.0001	0.0384	0.0118	0.0471	0.0172		38	1	38	12	55	870
12	1	194	1.51	0.0058	0.0001	0.0407	0.0084	0.0505	0.0111		38	1	41	8	218	511
13	1	142	1.12	0.0059	0.0002	0.0403	0.0126	0.0496	0.0166		38	1	40	13	175	779
14	1	104	1.32	0.0060	0.0001	0.0417	0.0084	0.0506	0.0117		38	1	42	8	221	535
15	1	68	1.35	0.0062	0.0003	0.0440	0.0312	0.0516	0.0341		40	2	44	13	266	1518
16	11	1636	1.34	0.0058	0.0001	0.0404	0.0085	0.0505	0.0110		37	1	40	8	219	502
17	5	562	1.27	0.0067	0.0002	0.0432	0.0063	0.0466	0.0093		43	1	43	6	31	479
18	11	1618	1.15	0.0059	0.0001	0.0427	0.0073	0.0525	0.0095		38	1	42	7	306	414
19	10	1396	1.35	0.0063	0.0001	0.0394	0.0130	0.0470	0.0146		40	1	39	13	51	765
20	6	854	1.35	0.0059	0.0001	0.0386	0.0103	0.0472	0.0145		38	1	38	10	62	731
21	8	1188	1.13	0.0061	0.0001	0.0426	0.0074	0.0504	0.0092		39	1	42	7	212	423
22	4	682	0.84	0.0062	0.0002	0.0415	0.0143	0.0483	0.0164		40	1	41	14	115	799
23	7	801	1.29	0.0064	0.0001	0.0420	0.0095	0.0474	0.0151		41	1	42	9	69	758
24	7	416	1.07	0.0095	0.0004	0.4727	0.0393	0.3600	0.0316		61	2	393	33	3750	133
25	9	1206	0.86	0.0060	0.0001	0.0406	0.0101	0.0488	0.0140		39	1	40	10	140	675
26	4	457	0.98	0.0064	0.0003	0.0566	0.0250	0.0638	0.3683		41	2	56	36	736	17345

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