福建白垩纪红层火山岩夹层时代及构造意义

陈淑华; 林慈銮; 徐维光; 赵骏杰

doi:10.3799/dqkx.2020.035

福建白垩纪红层火山岩夹层时代及构造意义

doi: 10.3799/dqkx.2020.035

福建省地质调查研究院, 福建福州 350013

基金项目:

中国地质科学院地质研究所台湾海峡两岸地质条件及地质系统图件编制 DD20160345

详细信息

作者简介:
陈淑华(1985-), 女, 工程师, 从事地质矿产综合研究

中图分类号: P56
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出版历程
- 收稿日期: 2020-02-26
- 刊出日期: 2020-07-15

Age and Tectonic Significance of Volcanic Rocks in Cretaceous Red Beds in Fujian

Fujian Institute of Geological Survey, Fuzhou 350013, China

摘要

摘要: 为了研究福建省白垩纪红层形成的时代及构造背景，在政和-大埔断裂以西选取典型红层盆地，对不同盆地内火山岩夹层进行LA-ICP-MS锆石同位素定年和岩石地球化学分析.同位素U-Pb测年结果显示：沙县组的时限较长，为127~87 Ma，其总体时代应大致相当于晚白垩世早期，下部层段跨入早白垩世晚期；崇安组年龄为100.0±1.2 Ma，形成时代为晚白垩世早期.岩石地球化学结果表明，白垩纪红层中的火山岩为壳源成因，是处伸展环境下，为构造活动引起区域断陷拉张作用形成的一套钙碱性系列流纹岩.
- 白垩纪 /
- 红层 /
- 火山岩 /
- 沙县组 /
- 构造学
Abstract: In order to research the age and tectonic setting of the Cretaceous red beds in Fujian Province, typical red bed basins were selected on the west of the Zhenghe-Dapu fault, LA-ICP-MS zircon isotopic dating and rock geochemical analysis were performed on volcanic rocks in different basins. The results of zircon U-Pb isotopic dating show that the Shaxian Formation has a longer duration, which is 127-87 Ma, and its overall age should be roughly in early Late Cretaceous, and the lower part will enter the late Early Cretaceous. The age of the Chong'an Formation is 100.0±1.2 Ma, which is early Late Cretaceous. The results of petrochemical chemistry indicate that the volcanic rocks in the Cretaceous red beds are crust-originated and are a set of calcareous series rhyolites, which is in the extensional environment and formed by regional fault depression of tectonic activity.
- Cretaceous /
- red bed /
- volcanic rocks /
- Shaxian Formation /
- tectonics

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图 1 福建省白垩纪红层分布及采样位置

Fig. 1. Distribution and sampling location of the Cretaceous red beds in Fujian Province

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图 2 福建白垩纪红层火山岩野外及镜下照片

a.建瓯流纹质晶屑岩屑凝灰岩；b.建瓯流纹质晶屑岩屑凝灰岩镜下特征；c.白沙沉凝灰岩；d.白沙沉凝灰岩镜下特征；e.泰宁风洞流纹质晶屑弱熔结凝灰岩；f.风洞流纹质晶屑弱熔结凝灰岩镜下特征；g. 泰宁大金湖流纹质晶屑凝灰岩；h. 大金湖流纹质晶屑凝灰岩镜下特征；i.上杭流纹质角砾岩屑凝灰岩；j.上杭流纹质角砾岩屑凝灰岩镜下特征；k.武平流纹质晶屑凝灰岩；l.武平流纹质晶屑凝灰岩镜下特征

Fig. 2. Field photos and photomicrographs of the Cretaceous red bed volcanic rocks in Fujian Province

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图 3 火山岩TAS图解

据Le Bas（1986）

Fig. 3. TAS diagram of volcanic rocks

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图 4 硅-碱关系

据据Irvine and Baragar（1971）

Fig. 4. Diagram of SiO₂-(K₂O+Na₂O)

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图 5 火山岩AFM图解

据Irvine and Baragar（1971）

Fig. 5. A-F-M diagrams of volcanic rocks

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图 6 An-Ab-Or三角图解

据据Irvine and Baragar（1971）

Fig. 6. An-Ab-O diagrams of volcanic rocks

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图 7 微量元素洋中脊花岗岩（ORG）标准化蛛网图

据Pearce et al.(1984)

Fig. 7. Oceanic ridge granite trace element patterns

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图 8 火山岩稀土配分模式图

据Boynton（1984）

Fig. 8. REE patterns of volcanic rocks

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图 9 样品锆石U-Pb测年谐和图（单位：Ma）

Fig. 9. The U-Pb concordia diagram of zircons samples

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图 10 微量元素构造背景判别图

a. Nb-Y图解；b. Rb-（Y+Nb）图解；WPG.板内花岗岩；VAG.火山弧花岗岩；syn-COLG.同碰撞花岗岩；ORG.洋脊花岗岩；图a中断线是产于异常洋脊的ORG的边界线；LCC.下陆壳；AFC.地壳混染与分离结晶作用; 据Pearce（1984, 1996）

Fig. 10. Discrimination diagrams of tectonic settings by trace elements

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图 11 R₁-R₂构造环境判别图

1.地幔分异产物；2.板块碰撞前；3.碰撞后隆起；4.造山晚期；5.非造山；6.同碰撞；7.造山后；据Batchelor and Bowden（1985）

Fig. 11. Diagrams of tectonic settings by R₁-R₂

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图 12 戈蒂尼-里特曼指数图

A区.板内稳定区；B区.造山带区（岛弧及活动大陆边缘）；C区. A及B区演化的碱性火山岩; 据Rittmann（1973）

Fig. 12. Index diagram of lgδ-lgτ

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表 1 建瓯盆地JOTW样品LA-ICP-MS锆石U-Pb数据

Table 1. LA-ICP-MS U-Pb abundance of zircons from sample JOTW in Jianou basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄（Ma）
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
2	491.44	264.83	1.86	0.047 7	0.002 8	0.120 4	0.006 5	0.018 5	0.000 4	87	133	115	6	118	2
4	205.05	281.76	0.73	0.053 0	0.003 5	0.140 7	0.008 3	0.019 7	0.000 4	328	150	134	7	126	3
5	1 055.23	675.42	1.56	0.051 4	0.002 3	0.141 3	0.006 6	0.019 7	0.000 3	257	108	134	6	126	2
6	448.27	477.47	0.94	0.047 5	0.0030	0.120 3	0.006 4	0.018 5	0.000 4	72	144	115	6	118	2
7	108.62	119.91	0.91	0.057 5	0.008 7	0.146 7	0.019 2	0.019 3	0.001 0	522	335	139	17	123	6
8	1 200.21	812.79	1.48	0.047 6	0.002 4	0.123 0	0.005 3	0.018 8	0.000 3	76	115	118	5	120	2
9	296.24	351.40	0.84	0.056 5	0.004 4	0.149 5	0.009 8	0.019 6	0.000 5	472	169	141	9	125	3
11	463.03	397.40	1.17	0.053 0	0.003 5	0.144 6	0.009 2	0.019 9	0.000 4	328	153	137	8	127	2
12	380.58	462.79	0.82	0.050 3	0.002 7	0.124 5	0.006 4	0.018 2	0.000 4	206	122	119	6	116	2
13	535.76	302.40	1.77	0.052 5	0.005 0	0.126 7	0.011 4	0.017 9	0.000 5	306	217	121	10	115	3
14	325.74	285.01	1.14	0.051 5	0.003 6	0.131 4	0.008 5	0.018 8	0.000 4	261	158	125	8	120	2
15	393.87	438.88	0.90	0.050 8	0.002 9	0.128 3	0.007 4	0.018 5	0.000 4	235	131	123	7	118	2
16	349.09	262.30	1.33	0.050 0	0.004 0	0.124 2	0.007 8	0.018 7	0.000 5	195	174	119	7	120	3
18	459.63	410.12	1.12	0.051 0	0.003 6	0.135 3	0.008 5	0.019 6	0.000 4	243	163	129	8	125	2
19	323.01	312.96	1.03	0.055 4	0.003 7	0.135 0	0.008 3	0.018 1	0.000 4	428	150	129	7	115	3
21	967.26	828.83	1.17	0.046 4	0.0028	0.117 0	0.006 6	0.018 3	0.000 3	20	146	112	6	117	2
22	393.58	497.70	0.79	0.047 5	0.002 6	0.123 5	0.006 4	0.018 7	0.000 3	72	126	118	6	120	2
23	210.09	229.60	0.92	0.049 4	0.003 8	0.124 6	0.008 5	0.018 9	0.000 5	169	170	119	8	121	3
24	168.68	245.10	0.69	0.052 3	0.003 5	0.136 6	0.008 2	0.019 3	0.000 4	302	156	130	7	123	3
25	206.58	240.15	0.86	0.046 8	0.003 5	0.122 3	0.008 1	0.018 9	0.000 4	39	170	117	7	121	3
26	183.89	163.26	1.13	0.052 9	0.004 2	0.125 2	0.007 4	0.018 4	0.000 5	324	181	120	7	118	3
27	192.29	271.53	0.71	0.047 8	0.004 0	0.123 8	0.010 2	0.018 7	0.000 7	100	180	118	9	120	4
29	189.35	152.62	1.24	0.049 9	0.004 8	0.125 3	0.009 5	0.019 7	0.000 7	191	207	120	9	126	4

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表 2 白沙盆地BsTW样品LA-ICP-MS锆石U-Pb数据

Table 2. LA-ICP-MS U-Pb abundance of zircons from sample BsTW in Baisha basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄(Ma)
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
3	138.12	393.06	0.35	0.050 9	0.001 8	0.127 5	0.002 8	0.018 2	0.000 3	236	80	122	3	116	2
4	232.13	396.70	0.59	0.051 9	0.001 8	0.136 5	0.003 0	0.019 1	0.000 3	280	79	130	3	122	2
5	233.64	455.61	0.51	0.049 3	0.001 9	0.126 3	0.003 3	0.018 6	0.000 3	161	87	121	3	119	2
7	133.70	217.41	0.61	0.050 4	0.002 1	0.132 9	0.004 1	0.019 1	0.000 3	214	94	127	4	122	2
9	172.86	294.62	0.59	0.048 8	0.001 8	0.128 1	0.003 1	0.019 1	0.000 3	137	85	122	3	122	2
10	293.04	602.21	0.49	0.048 0	0.001 6	0.125 6	0.002 5	0.019 0	0.000 3	101	79	120	2	121	2
14	221.74	474.93	0.47	0.048 6	0.002 0	0.126 3	0.003 8	0.018 9	0.000 3	128	94	121	3	120	2
15	998.71	755.95	1.32	0.049 0	0.001 7	0.125 5	0.002 6	0.018 6	0.000 3	148	79	120	2	119	2
18	131.46	141.49	0.93	0.048 7	0.002 3	0.122 3	0.004 6	0.018 2	0.000 3	136	107	117	4	116	2
19	274.94	358.98	0.77	0.048 1	0.001 8	0.124 8	0.003 0	0.018 8	0.000 3	104	84	119	3	120	2
20	203.19	260.87	0.78	0.050 4	0.002 1	0.131 3	0.004 2	0.018 9	0.000 3	214	95	125	4	121	2
21	222.66	258.82	0.86	0.048 9	0.001 9	0.126 2	0.003 5	0.018 7	0.000 3	145	90	121	3	119	2
24	267.44	396.11	0.68	0.048 8	0.001 8	0.127 5	0.003 2	0.018 9	0.000 3	140	86	122	3	121	2

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表 3 泰宁盆地风洞14611TW样品LA-ICP-MS锆石U-Pb数据

Table 3. LA-ICP-MS U-Pb abundance of zircons from sample 14611TW in Fengdong of Taining basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄(Ma)
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
2	120.4	186.76	0.64	0.0481	0.002 2	0.103 1	0.003 7	0.015 5	0.000 2	105	104	100	3	99	1
3	112.6	133.85	0.84	0.0489	0.003 1	0.112 5	0.006 3	0.016 7	0.000 3	143	142	108	6	107	2
4	148.9	217.33	0.69	0.050 9	0.002 2	0.114 2	0.003 6	0.016 3	0.000 2	238	95	110	3	104	1
5	284.9	648.43	0.44	0.047 5	0.001 7	0.108 1	0.002 3	0.016 5	0.000 2	74	82	104	2	106	1
6	118.1	202.25	0.58	0.048 7	0.003 6	0.107 1	0.007 2	0.015 9	0.000 3	135	164	103	7	102	2
7	249.9	454.79	0.55	0.048 5	0.001 8	0.103 5	0.002 4	0.015 5	0.000 2	123	83	100	2	99	1
8	232.3	493.45	0.47	0.050 0	0.001 8	0.109 6	0.002 5	0.015 9	0.000 2	197	82	106	2	102	1
9	290.4	616.31	0.47	0.048 4	0.001 7	0.101 6	0.002 1	0.015 2	0.000 2	120	80	98	2	97	1
10	104.3	180.26	0.58	0.052 4	0.002 4	0.116 2	0.004 0	0.016 1	0.000 2	302	99	112	4	103	2
11	555.5	836.37	0.66	0.051 9	0.002 1	0.113 7	0.003 3	0.015 9	0.000 2	280	90	109	3	102	1
12	133.6	174.96	0.76	0.049 9	0.002 2	0.111 5	0.003 8	0.016 2	0.000 2	192	100	107	4	104	2
15	93.21	142.06	0.66	0.048 0	0.003 8	0.100 7	0.007 4	0.015 2	0.000 3	97	180	97	7	97	2
16	138.8	362.02	0.38	0.050 8	0.002 0	0.112 5	0.003 2	0.016 1	0.000 2	231	89	108	3	103	1
17	298.4	683.01	0.44	0.051 3	0.002 0	0.112 9	0.003 2	0.016 0	0.000 2	256	88	109	3	102	1
18	458.2	931.71	0.49	0.050 6	0.001 7	0.112 7	0.002 1	0.016 2	0.000 2	222	75	109	2	103	1
20	207.3	456.18	0.45	0.049 6	0.001 8	0.107 4	0.002 7	0.015 7	0.000 2	174	84	104	2	101	1
21	169.7	347.64	0.49	0.048 8	0.001 8	0.109 5	0.002 7	0.016 3	0.000 2	139	84	106	2	104	1
23	411.5	942.11	0.44	0.050 4	0.001 7	0.110 0	0.002 0	0.015 8	0.000 2	212	74	106	2	101	1
24	140.5	276.71	0.51	0.052 5	0.002 1	0.117 6	0.003 3	0.016 3	0.000 2	306	87	113	3	104	1

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表 4 泰宁盆地大金湖TNTW样品LA-ICP-MS锆石U-Pb数据

Table 4. LA-ICP-MS U-Pb abundance of zircons from sample TNTW in Fengdong of Taining basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄(Ma)
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
1	45.3	72.9	0.62	0.057 6	0.008 4	0.112 6	0.011 8	0.015 9	0.000 7	517	320	108	11	101	4
3	159.0	291.0	0.55	0.050 5	0.003 9	0.103 5	0.006 9	0.015 3	0.000 4	220	178	100	6	98	2
4	53.9	65.9	0.82	0.048 5	0.011 2	0.078 9	0.012 9	0.015 5	0.000 9	124	470	77	12	99	6
5	52.8	75.0	0.70	0.048 5	0.005 7	0.090 6	0.008 3	0.015 9	0.000 5	124	252	88	8	102	3
6	74.4	137.8	0.54	0.054 2	0.007 4	0.097 3	0.008 9	0.013 6	0.000 4	389	311	94	8	87	3
7	217.0	447.0	0.48	0.045 9	0.002 9	0.096 0	0.005 1	0.015 5	0.000 3	23 222	78	93	5	99	2
8	148.0	246.0	0.60	0.050 3	0.004 1	0.100 5	0.007 3	0.015 2	0.000 4	209	189	97	7	97	2
9	118.0	212.0	0.56	0.051 5	0.004 2	0.105 8	0.007 8	0.015 5	0.000 4	265	189	102	7	99	3
10	37.3	48.8	0.76	0.058 3	0.011 4	0.105 2	0.012 3	0.015 9	0.001 0	543	431	102	11	102	7
12	118.0	109.0	1.08	0.058 1	0.009 4	0.102 4	0.012 2	0.015 0	0.000 8	600	361	99	11	96	5
13	42.6	67.6	0.63	0.042 2	0.008 6	0.093 8	0.015 9	0.015 1	0.000 9	348	99	91	15	97	6
14	119.0	178.0	0.67	0.053 0	0.005 7	0.100 2	0.007 0	0.015 1	0.000 4	328	244	97	6	97	3
16	271.0	286.0	0.95	0.048 6	0.004 6	0.097 7	0.008 2	0.014 9	0.000 6	132	207	95	8	95	4
17	71.8	139.0	0.51	0.056 4	0.006 3	0.105 6	0.009 0	0.015 5	0.000 5	478	250	102	8	99	3
18	58.0	97.9	0.59	0.051 1	0.006 8	0.096 8	0.008 9	0.015 4	0.000 6	243	285	94	8	99	4
19	75.2	101.0	0.74	0.045 8	0.007 6	0.086 6	0.009 8	0.015 8	0.000 7	347	82	84	9	101	4
20	71.2	82.5	0.86	0.067 8	0.013 8	0.103 1	0.012 7	0.015 2	0.000 6	865	432	100	12	97	4
21	142	234.0	0.61	0.045 3	0.003 7	0.102 4	0.007 5	0.016 4	0.000 4	272	44	99	7	105	3
22	56.5	63.4	0.89	0.055 7	0.006 5	0.103 0	0.009 1	0.015 3	0.000 6	443	258	99	8	98	4
23	87.0	83.3	1.04	0.046 2	0.006 0	0.092 6	0.008 8	0.016 2	0.000 6	249	285	90	8	104	4
25	40.6	61.8	0.66	0.064 1	0.015 9	0.111 2	0.016 9	0.015 9	0.001 0	746	544	107	15	102	6
26	198.0	408.0	0.49	0.049 7	0.002 9	0.109 2	0.005 4	0.016 3	0.000 3	189	142	105	5	104	2
27	178.0	213.0	0.83	0.049 1	0.005 8	0.102 3	0.010 9	0.015 5	0.000 5	150	259	99	10	99	3
28	320.0	443.0	0.72	0.048 2	0.003 1	0.104 1	0.005 8	0.015 9	0.000 4	109	148	101	5	101	2
29	196.0	274.0	0.72	0.044 4	0.003 7	0.097 9	0.007 0	0.016 1	0.000 4	272	94	95	6	103	2
30	63.6	76.8	0.83	0.062 2	0.014 1	0.107 8	0.010 1	0.016 1	0.000 6	680	500	104	9	103	4

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表 5 上杭盆地ShTW样品LA-ICP-MS锆石U-Pb数据

Table 5. LA-ICP-MS U-Pb abundance of zircons from sample ShTW in Shanghang basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄(Ma)
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
1	600.36	412.67	1.45	0.047 3	0.003 2	0.096 0	0.0063	0.0147	0.000 2	62	153	93	6	94	2
2	212.37	115.46	1.84	0.050 1	0.019 1	0.100 6	0.037 6	0.014 6	0.001 2	199	706	97	35	93	8
3	475.00	465.15	1.02	0.052 8	0.003 1	0.103 0	0.005 9	0.014 1	0.000 2	322	128	100	5	91	1
4	477.34	416.10	1.15	0.049 0	0.003 1	0.099 0	0.006 2	0.014 7	0.000 2	147	144	96	6	94	1
5	1 011.51	704.36	1.44	0.046 9	0.002 4	0.093 5	0.004 6	0.014 5	0.000 2	42	118	91	4	93	1
6	454.99	472.90	0.96	0.048 9	0.003 0	0.096 9	0.005 7	0.014 4	0.000 2	142	137	94	5	92	1
7	951.05	403.43	2.36	0.050 6	0.004 4	0.098 3	0.008 4	0.014 1	0.000 3	223	190	95	8	90	2
8	513.29	472.52	1.09	0.047 1	0.003 1	0.098 1	0.006 4	0.015 1	0.000 2	56	152	95	6	97	2
9	765.05	482.08	1.59	0.049 6	0.003 8	0.102 9	0.007 8	0.015 0	0.000 3	178	171	99	7	96	2
10	551.34	479.21	1.10	0.051 6	0.003 9	0.105 2	0.007 7	0.014 8	0.000 3	266	163	102	7	95	2
11	1 116.74	525.37	2.13	0.047 6	0.004 4	0.099 8	0.009 0	0.015 2	0.000 3	80	206	97	8	97	2
12	229.68	109.03	2.11	0.049 0	0.007 3	0.097 6	0.014 2	0.014 4	0.000 5	149	316	95	13	92	3
13	536.86	474.44	1.13	0.052 0	0.005 1	0.101 3	0.009 6	0.014 1	0.000 3	287	209	98	9	90	2
14	465.70	439.72	1.06	0.048 9	0.003 0	0.100 5	0.006 1	0.014 9	0.000 2	141	139	97	6	95	1
15	2 406.64	529.16	4.55	0.052 0	0.002 9	0.105 8	0.005 7	0.014 8	0.000 2	284	122	102	5	94	1
16	650.03	510.54	1.27	0.049 9	0.002 9	0.100 7	0.005 7	0.014 6	0.000 2	189	131	97	5	94	1
17	596.32	317.25	1.88	0.050 9	0.009 9	0.105 3	0.019 9	0.015 0	0.000 7	237	395	102	18	96	4
18	360.64	219.61	1.64	0.053 2	0.005 8	0.109 3	0.011 6	0.014 9	0.000 4	338	229	105	11	95	2
19	571.81	466.22	1.23	0.051 3	0.007 5	0.100 8	0.014 4	0.014 2	0.000 5	256	305	98	13	91	3
20	1 294.90	861.69	1.50	0.049 2	0.002 1	0.098 2	0.004 1	0.014 5	0.000 2	156	98	95	4	93	1
21	847.18	558.48	1.52	0.050 8	0.003 3	0.103 4	0.006 5	0.014 8	0.000 2	232	142	100	6	94	1
22	2 487.35	744.17	3.43	0.048 1	0.002 6	0.095 5	0.005 0	0.014 4	0.000 2	103	124	93	5	92	1
23	628.40	473.44	1.33	0.047 7	0.002 8	0.099 5	0.005 6	0.015 1	0.000 2	83	133	96	5	97	1
24	498.85	377.03	1.32	0.053 1	0.003 5	0.108 4	0.007 0	0.014 8	0.000 2	334	144	105	6	95	1

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表 6 武平盆地WPTW样品LA-ICP-MS锆石U-Pb数据

Table 6. LA-ICP-MS U-Pb abundance of zircons from sample WPTW in Wuping basin

测点	（10^-6）		Th/U	同位素比值						同位素年龄（Ma）
测点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s	²⁰⁷Pb/ ²⁰⁶Pb	1s	²⁰⁷Pb/ ²³⁵U	1s	²⁰⁶Pb/ ²³⁸U	1s
4	562.19	1 583.39	0.36	0.050 0	0.002 5	0.101 5	0.004 8	0.014 7	0.000 2	196	111	98	4	94	1
5	324.18	374.19	0.87	0.047 0	0.003 4	0.097 5	0.006 8	0.015 0	0.000 3	50	164	95	6	96	2
9	1 217.35	522.16	2.33	0.047 1	0.002 7	0.096 9	0.005 4	0.014 9	0.000 2	55	131	94	5	95	1
11	126.21	241.26	0.52	0.048 2	0.008 7	0.100 0	0.017 6	0.015 1	0.000 6	107	377	97	16	96	4
13	457.46	498.01	0.92	0.048 4	0.003 1	0.098 8	0.006 2	0.014 8	0.000 2	119	144	96	6	95	1
17	374.88	413.99	0.91	0.048 3	0.004 0	0.096 8	0.007 7	0.014 5	0.000 3	114	183	94	7	93	2

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