缅甸沙林凹陷晚白垩世凝灰岩LA-ICP-MS锆石U-Pb年龄与地质意义

黄聿晓; 张训华; 黄奇瑜; 郭兴伟; 孙建伟

doi:10.16028/j.1009-2722.2018.08006

缅甸沙林凹陷晚白垩世凝灰岩LA-ICP-MS锆石U-Pb年龄与地质意义

1.
山东科技大学, 青岛 266590

2.
中国地质调查局青岛海洋地质研究所，青岛 266071

3.
青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室，青岛 266235

4.
中国地质调查局南京地质调查中心，南京 210016

5.
同济大学，上海 200092

基金项目:
国家海洋地质专项(DD20160147)；鳌山科技创新计划项目(2015ASKJ03)；国家自然科学基金(41472093)；国家自然科学基金联合基金(U1505231)

详细信息

作者简介: 黄聿晓(1991—)，男，硕士，主要从事海洋地质构造的研究工作.E-mail:13573259157@163.com

通讯作者: 张训华(1961—)，男，博士，研究员，博导，主要从事海洋地球物理的研究工作.E-mail:xunhuazh@vip.sina.com

中图分类号: P597.3

收稿日期: 2018-05-02

刊出日期: 2018-08-28

U-PB AGES OF LA-ICP-MS ZIRCON FROM LATE CRETACEOUS TUFF IN THE SALIN DEPRESSION OF MYANMAR AND THEIR GEOLOGICAL SIGNIFICANCE

1.
Shandong University of Science and Technology, Qingdao 266590, China

2.
Qingdao Institute of Marine Geology, CGS, Qingdao 266071, China

3.
Qingdao Marine Science and Technology National Laboratory Marine Mineral ResourceEvaluation and Detection Technology Function Laboratory, Qingdao 266235, China

4.
Nanjing Geological Survey Center, CGS, Nanjing 210016, China

5.
Tongji University, Shanghai 200092, China

More Information

Corresponding author: ZHANG Xunhua, xunhuazh@vip.sina.com

Received Date: 02 May 2018

Publish Date: 28 August 2018

摘要

摘要:
在沉积盆地沉积序列中，凝灰岩是源区火山活动与造山运动的直接产物，常见于在板块边缘。对缅甸中北部弧前盆地沙林凹陷内凝灰岩地层进行准确的年代学测量，探讨其形成的大地构造背景。研究认为, 对凝灰岩中锆石的年代学测量，得到的年龄分别为70±1.0 Ma，64.2±1.2 Ma，65±1.0 Ma，64±0.8 Ma，判断庞吉组沉积年代属于晚白垩世—早古新世；新特提斯洋的B型俯冲导致缅甸中央盆地的岩浆活动，在沙林凹陷内沉积了凝灰岩。
- 晚白垩世 /
- 凝灰岩 /
- 锆石 /
- LA-ICP-MS /
- 缅甸
Abstract:
Tuff, as a direct product of volcanic activity, is often found along the edge of the plate. Accurate geochronological dating for the tuff formations in the Salin Depression of the pre-Arc Basin in the north-central part of Myanmar may found a reliable basis for stratigraphic division and calibration of the study area. The tectonic movement between blocks, supplemented by geochemical data, may provide time constraints for delineations of tectonic settings. Our data suggest that: 1) The ages of zircons in tuffs are 70±1.0 Ma, 64.2±1.2 Ma, 65±1.0 Ma, and 64±0.8 Ma., indicating that the Pangji Formation is Late Cretaceous in age. 2) The B-type subduction of the Neo-Tethys Ocean led to magmatic activity in the Central Basin of Myanmar. Tuff deposits derived are deposited in the Salin Depression.
- Late Cretaceous /
- tuff /
- zircon /
- LA-ICP-MS /
- Burma

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图 1 甸中央盆地构造单元与沙林凹陷地质图(据文献[4])

Figure 1.

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图 2 沙林凹陷地层剖面图

Figure 2.

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图 3 沙林凹陷古新统凝灰岩凝灰岩野外露头照片

Figure 3.

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图 4 缅甸沙林凹陷凝灰岩镜下照片

Figure 4.

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图 5 沙林凹陷庞吉组火山碎屑岩CL图像

Figure 5.

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图 6 沙林凹陷古新统凝灰岩锆石U-Pb谐和图

Figure 6.

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图 7 85 Ma以来印度板块与欧亚大陆汇聚速度和角度变化示意图(引自文献[10])

Figure 7.

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表 1 凝灰岩样品YX1 LA-ICP-MS U-Pb年龄数据

Table 1. YX1 LA-ICP-MS:U-Pb age data for tuff samples

样品号	含量/10^-6				²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
YX1	Pb	²³²Th	²³⁸U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	6.84	260	503	0.52	0.047 9	0.002 0	0.070 2	0.002 8	0.010 8	0.000 2	94.5	100	68.9	3	69.3	1
2	4.59	256	307	0.83	0.050 0	0.003 6	0.070 2	0.004 5	0.010 6	0.000 2	195	168	68.9	4	68.2	1
3	3.47	169	254	0.67	0.042 2	0.003 9	0.061 2	0.005 3	0.010 6	0.000 3	error		60.3	5	67.9	2
4	1.41	57.3	98.6	0.58	0.056 5	0.006 6	0.081 4	0.007 6	0.011 1	0.000 3	472	268	79.5	7	71.1	2
5	3.91	228	262	0.87	0.042 8	0.003 4	0.061 7	0.004 5	0.011 0	0.000 3	error		60.8	4	70.8	2
6	0.93	38.0	64.0	0.59	0.062 7	0.017 2	0.074 3	0.008 9	0.011 7	0.000 6	698	496	72.7	8	75.1	4
7	5.36	190	392	0.48	0.044 9	0.002 6	0.068 2	0.003 8	0.011 0	0.000 2	error		67.0	4	70.5	1
8	1.64	71.4	116	0.61	0.053 4	0.005 0	0.077 5	0.005 6	0.011 0	0.000 3	346	211	75.8	5	70.6	2
9	1.47	48.5	97.5	0.5	0.050 9	0.006 7	0.071 4	0.007 9	0.011 5	0.000 5	235	281	70.0	7	73.4	3
10	1.54	74.4	110	0.67	0.068 8	0.008 0	0.084 9	0.006 0	0.010 5	0.000 4	894	243	82.7	6	67.6	3

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表 2 凝灰岩样品YX7 LA-ICP-MS U-Pb年龄数据

Table 2. Tuff sample YX7 LA-ICP-MS:U-Pb age data

样品号	含量/10^-6				²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
YX7	Pb	²³²Th	²³⁸U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	4.36	194	316	0.61	0.051 8	0.007 2	0.067 9	0.004 5	0.010 2	0.000 3	276	289	66.7	4	65.6	2
2	8.13	419	584	0.72	0.050 0	0.002 3	0.071 0	0.003 1	0.010 4	0.000 2	195	107	69.6	3	66.8	1
3	3.9	288	288	1	0.049 0	0.003 4	0.064 0	0.004 2	0.009 7	0.000 2	150	156	63.0	4	62.0	1
4	5.25	286	429	0.67	0.047 2	0.003 3	0.061 6	0.003 7	0.009 5	0.000 2	57.5	163	60.7	4	60.8	1
5	5.26	239	416	0.57	0.048 7	0.002 8	0.066 3	0.003 6	0.010 1	0.000 2	132	130	65.2	3	65.1	1
7	12.95	628	983	0.64	0.055 7	0.003 4	0.077 4	0.003 9	0.010 2	0.000 2	439	137	75.7	4	65.4	1
8	4.94	308	380	0.81	0.044 6	0.003 1	0.061 5	0.003 8	0.010 1	0.000 2	error		60.6	4	64.6	1
9	3.09	111	261	0.43	0.046 3	0.006 3	0.062 5	0.007 6	0.009 8	0.000 4	13.1	296	61.6	7	63.1	2
10	8.29	471	612	0.77	0.054 9	0.005 5	0.074 3	0.006 9	0.009 9	0.000 3	406	226	72.7	7	63.6	1
11	4.16	174	331	0.53	0.050 3	0.003 7	0.071 0	0.004 8	0.010 4	0.000 3	209	170	69.6	5	66.9	1
12	2.84	137	226	0.61	0.053 6	0.006 2	0.069 1	0.007 3	0.010 0	0.000 3	354	261	67.9	7	64.0	2
13	5	291	365	0.8	0.051 3	0.003 7	0.069 7	0.004 6	0.010 2	0.000 2	254	167	68.4	4	65.5	1
14	2.64	87.2	221	0.4	0.050 4	0.004 3	0.066 6	0.004 5	0.010 3	0.000 3	217	231	65.5	4	65.8	1
15	2.46	117	191	0.61	0.047 5	0.004 3	0.065 3	0.005 3	0.010 5	0.000 3	72.3	204	64.2	5	67.3	1
16	14.01	1129	1028	1.1	0.050 8	0.003 2	0.068 3	0.003 4	0.009 7	0.000 2	232	144	67.1	3	62.1	1
17	4.11	212	329	0.64	0.074 2	0.005 9	0.093 8	0.007 2	0.009 2	0.000 2	1056	160	91.1	7	59.3	1

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表 3 凝灰岩样品YX8 LA-ICP-MS U-Pb年龄数据

Table 3. Tuff sample YX8 LA-ICP-MS:U-Pb age data

样品号	含量/10^-6				²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
YX8	Pb	²³²Th	²³⁸U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	5.84	300	444	0.67	0.049 7	0.002 4	0.068 8	0.003 1	0.010 0	0.000 2	183	111	67.6	3	64.2	1
2	8.53	392	646	0.61	0.044 5	0.002 0	0.063 5	0.002 7	0.010 4	0.000 2	error		62.5	3	66.5	1
3	5.39	234	414	0.56	0.051 7	0.002 7	0.072 5	0.003 6	0.010 3	0.000 2	272	120	71.0	3	66.1	1
4	5.01	244	406	0.6	0.047 1	0.003 1	0.062 7	0.003 8	0.009 7	0.000 2	53.8	157	61.7	4	62.5	1
6	3.29	135	254	0.53	0.047 0	0.003 1	0.066 4	0.003 8	0.010 4	0.000 2	55.7	139	65.3	4	66.7	1
7	4.42	196	364	0.54	0.051 1	0.003 7	0.067 5	0.004 2	0.009 8	0.000 2	256	197	66.3	4	62.6	1
8	2.51	101	196	0.52	0.050 5	0.004 6	0.067 9	0.004 9	0.010 5	0.000 3	217	200	66.7	5	67.5	2
9	7.80	509	565	0.9	0.048 8	0.002 4	0.067 6	0.003 2	0.010 2	0.000 2	200	121	66.5	3	65.2	1
10	2.77	102	220	0.46	0.051 1	0.006 3	0.070 1	0.006 9	0.010 4	0.000 3	243	263	68.8	7	66.9	2
11	3.23	135	253	0.54	0.046 6	0.003 9	0.064 0	0.004 8	0.010 1	0.000 3	27.9	193	63.0	5	65.1	2
12	13.5	1626	776	2.1	0.051 2	0.003 9	0.069 7	0.005 2	0.009 8	0.000 3	250	176	68.4	5	63.0	2
13	4.01	162	318	0.51	0.056 5	0.004 1	0.073 1	0.004 3	0.010 0	0.000 2	472	166	71.7	4	64.3	1
14	4.65	202	354	0.57	0.044 9	0.003 2	0.063 9	0.003 9	0.010 5	0.000 2	error		62.9	4	67.3	1
15	3.17	165	246	0.67	0.046 8	0.004 2	0.060 5	0.004 4	0.009 8	0.000 2	39.0	200	59.7	4	62.8	1
16	2.12	68.5	176	0.39	0.051 6	0.006 3	0.064 1	0.006 1	0.009 9	0.000 3	333	194	63.1	6	63.8	2

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表 4 凝灰岩样品YX11 LA-ICP-MS U-Pb年龄数据

Table 4. Tuff sample YX11 LA-ICP-MS:U-Pb age data

样品号	含量/10^-6				²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
YX11	Pb	²³²Th	²³⁸U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	4.46	348	333	1.05	0.044 5	0.003 6	0.059 5	0.004 8	0.009 7	0.000 2	error		58.6	5	62.2	2
2	5.60	229	443	0.52	0.051 8	0.002 8	0.071 5	0.003 7	0.010 1	0.000 2	276	122	70.1	4	64.8	1
3	2.28	106	177	0.6	0.052 5	0.004 5	0.068 6	0.004 9	0.010 1	0.000 3	309	198	67.3	5	65.0	2
4	4.72	273	377	0.72	0.046 2	0.003 6	0.058 6	0.004 2	0.009 5	0.000 3	9.4	178	57.8	4	60.7	2
5	2.87	150	231	0.65	0.051 3	0.005 1	0.068 0	0.005 9	0.009 8	0.000 3	254	236	66.8	6	62.9	2
6	5.79	312	461	0.68	0.053 0	0.003 6	0.070 5	0.004 4	0.010 0	0.000 2	328	156	69.2	4	64.0	1
7	3.22	189	243	0.78	0.050 0	0.004 8	0.065 7	0.005 6	0.009 8	0.000 3	195	272	64.6	5	63.0	2
8	16.29	958	1234	0.78	0.051 6	0.003 3	0.067 9	0.002 9	0.009 6	0.000 2	333	142	66.7	3	61.8	1
9	11.74	771	858	0.9	0.050 5	0.002 7	0.070 4	0.003 3	0.010 1	0.000 2	217	122	69.0	3	64.7	1
10	3.60	196	273	0.72	0.051 1	0.003 6	0.067 7	0.004 2	0.010 1	0.000 3	256	197	66.6	4	64.6	2
11	3.49	178	270	0.66	0.045 3	0.003 8	0.060 2	0.004 2	0.010 1	0.000 2	error		59.4	4	64.7	2
12	3.15	104	253	0.41	0.052 9	0.004 7	0.071 7	0.005 3	0.010 2	0.000 3	324	206	70.3	5	65.1	2
13	13.38	1007	1006	1	0.047 4	0.002 4	0.062 9	0.003 3	0.009 6	0.000 2	77.9	109	62.0	3	61.5	1
14	3.03	162	219	0.74	0.053 6	0.006 0	0.074 0	0.006 9	0.010 2	0.000 3	367	256	72.5	7	65.5	2
15	5.27	335	427	0.78	0.052 0	0.004 1	0.068 4	0.005 4	0.009 6	0.000 3	287	179	67.1	5	61.8	2
16	4.47	207	354	0.58	0.052 6	0.003 9	0.071 9	0.005 0	0.010 2	0.000 2	322	136	70.5	5	65.1	1
17	5.62	321	422	0.76	0.051 4	0.004 0	0.072 4	0.005 0	0.010 4	0.000 3	257	175	70.9	5	66.6	2
18	1.54	98.1	120	0.81	0.045 6	0.007 7	0.058 6	0.008 5	0.009 4	0.000 4	error		57.8	8	60.4	2
19	5.88	400	416	0.96	0.054 2	0.003 7	0.073 3	0.004 3	0.010 0	0.000 2	376	154	71.8	4	64.3	1
20	4.11	176	341	0.52	0.054 6	0.003 9	0.072 5	0.004 1	0.009 9	0.000 2	394	156	71.1	4	63.8	2
21	4.09	306	285	1.07	0.048 1	0.005 3	0.062 1	0.005 5	0.010 0	0.000 3	106	241	61.1	5	64.0	2
22	3.43	203	248	0.82	0.053 4	0.004 5	0.073 6	0.005 5	0.010 4	0.000 3	346	193	72.1	5	66.7	2

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缅甸沙林凹陷晚白垩世凝灰岩LA-ICP-MS锆石U-Pb年龄与地质意义

作者简介: 黄聿晓(1991—)，男，硕士，主要从事海洋地质构造的研究工作.E-mail:13573259157@163.com

通讯作者: 张训华(1961—)，男，博士，研究员，博导，主要从事海洋地球物理的研究工作.E-mail:xunhuazh@vip.sina.com

U-PB AGES OF LA-ICP-MS ZIRCON FROM LATE CRETACEOUS TUFF IN THE SALIN DEPRESSION OF MYANMAR AND THEIR GEOLOGICAL SIGNIFICANCE

Corresponding author: ZHANG Xunhua, xunhuazh@vip.sina.com

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