滇中峨山地区中元古界昆阳群黑山头组火山岩锆石U-Pb年龄及其地质意义

刘军平; 曾文涛; 徐云飞; 胡绍斌; 孙柏东; 宋冬虎; 吕勃烨; 王伟

滇中峨山地区中元古界昆阳群黑山头组火山岩锆石U-Pb年龄及其地质意义

1.
云南省地质调查院, 云南昆明 650216

2.
云南省环境监测院, 云南昆明 650216

3.
昆明理工大学国土资源工程学院, 云南昆明 650093

基金项目:
中国地质调查局项目《云南1:5万二街、易门、鸣矣河、上浦贝幅区域地质调查》（编号：DD20160017）、《云南区域地质调查片区总结与服务产品开发》（编号：DD20160345-02）和云南省科技领军人才培养计划项目《西南“三江”叠合成矿作用与成矿预测》（编号：2013HA001）

详细信息

作者简介: 刘军平(1983-), 男, 硕士, 高级工程师, 从事区域地质与构造地质调查研究。E-mail:271090834@qq.com

通讯作者: 曾文涛(1971-), 男, 学士, 高级工程师, 从事区域地质调查及技术管理工作。E-mail:ynhjyzwt@163.com

中图分类号: P534.3;P597⁺.3

收稿日期: 2018-03-15

修回日期: 2018-05-20

刊出日期: 2018-11-15

U-Pb age of zircons of the volcanic rocks from Heishantou Formation of Mesoproterozoic Kunyang Group in Eshan County, central Yunnan Province, and its geological significance

1.
Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China

2.
Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China

3.
Kunming University of Science and Technology, Kunming 650093, Yunnan, China

More Information

Corresponding author: ZENG Wentao, ynhjyzwt@163.com

Received Date: 15 March 2018

Revised Date: 20 May 2018

Publish Date: 15 November 2018

摘要

摘要:
滇中玉溪-昆阳一带广泛出露的中元古界昆阳群是一套与晋宁运动密切相关的浅变质火山-沉积岩系，其形成时代、沉积充填序列及大地构造属性一直存在争议。出露于峨山县美党地区的昆阳群黑山头组富良棚段发育有厚近百米的安山质熔结凝灰岩、晶屑凝灰岩、玄武岩及岩屑凝灰岩。对样品D0121-1及D0121-2进行同位素年代学研究，分别获得LA-ICP-MS锆石U-Pb年龄加权平均值为1007±13Ma和1005±18Ma；同时，样品D0121-2中还获较多的2200±15Ma继承性锆石，推测滇中地区应存在古元古代的地质体。2件样品锆石的Th/U值均大于0.3，均具清晰的振荡环带结构，均为岩浆成因的锆石，表明黑山头组富良棚段形成于中元古代晚期，属于与造山作用相关的火山岩系，可能是罗迪尼亚超大陆事件在扬子陆块的响应，是全球格林维尔期造山过程的组成部分。
- 中元古界昆阳群 /
- 锆石U-Pb测年 /
- 峨山县美党地区 /
- 罗迪尼亚超大陆
Abstract:
Mesoproterozoic Kunyang Group, which is widely exposed in Yuxi-Kunyang area in central Yunnan Province, consists of metamorphic volcanic sedimentary rocks that are closely related to the Jinning movement. The chronology, sedimentary filling series and geotectonic features of Kunyang Group are problems of long controversy. There are andesitic ignimbrite, crystal tuff, basalt and lithic tuff several hundred meters in thickness in Fuliangpeng member of Heishantou Formation within Kunyang Group exposed in Meidang area, Eshan County. Two samples of D0121-1 and D0121-2 were used for isotopic dating. The weighted average ages of U-Pb zircon LA-ICP-MS obtained from sample D0121-1 and D0121-2 are 1007±13Ma and 1005±18Ma respectively. In addition, ancient inherited zircon 2200±15Ma was found in sample D0121-2. It is inferred that there is a Paleproterozoic geological body in central Yunnan Province. The Th/U ratios of zircon obtained from both samples are higher than 0.3, suggesting magmatic zircon. It is considered that Fuliangpeng member of Heishantou Formation was formed in the Late Mesoproterozoic period and belonged to the volcanic rock series related to orogeny, which was probably the response of the Rodinia Supercontinent Events in Yangtze continental block, being a part of the global Greenville orogenic process.
- Mesoproterozoic Kunyang Group /
- zircon U-Pb dating /
- Meidang area of Eshan County /
- Rodinia Supercontinent

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图 1 研究区大地构造位置（a）及采样位置（b）

Figure 1.

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图 2 安山质熔结凝灰岩（a、b）及玄武岩（c、d）手标本和显微照片（单偏光）

Figure 2.

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图 3 黑山头组富良棚段玄武岩（a）和安山质熔结凝灰岩（b）锆石阴极发光（CL）图像

Figure 3.

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图 4 玄武岩（a、b）和安山质熔结凝灰岩（c、d）锆石U-Pb年龄谐和图

Figure 4.

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表 1 玄武岩(D0121-2)和安山质熔结凝灰岩(D0121-1)LA-ICP-MS锆石U-Th-Pb年龄数据

Table 1. LA-ICP-MS zircon U-Th-Pb age data of basalt (D0121-2) and andesitic ignimbrite (D0121-1)

测点号	含量/10^-6		同位素比值						U-Pb年龄/Ma						U-Pb谐和度	Th/U
测点号	Th	U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb严U	1σ	²⁰⁶Pb/²³⁸U	1σ	_Pb/_Pb²⁰⁷²⁰⁶	1σ	²⁰⁷Pb严U	1σ	_Pb/_U²⁰⁶²³⁸	1σ	U-Pb谐和度	Th/U
样品D0121-2(玄武岩）
1	78.3	234.5	0.0720	0.0017	1.6644	0.0402	0.1671	0.0019	985	47.4	995	15.3	996	10.2	99%	0.3
2	30.1	65.5	0.0761	0.0024	1.7745	0.0593	0.1684	0.0022	1099	63.0	1036	21.7	1004	11.9	96%	0.5
3	167.6	190.3	0.0742	0.0017	1.7304	0.0415	0.1687	0.0017	1056	46.8	1020	15.4	1005	9.5	98%	0.9
4	370.4	484.3	0.0829	0.0018	2.0103	0.0563	0.1746	0.0030	1266	38.0	1119	19.0	1037	16.2	92%	0.8
5	86.9	322.8	0.0732	0.0017	1.7369	0.0435	0.1719	0.0025	1020	45.5	1022	16.1	1023	13.5	99%	0.3
6	110.7	186.9	0.0786	0.0021	1.8706	0.0589	0.1706	0.0022	1162	52.3	1071	20.9	1015	12.0	94%	0.6
7	126.5	161.9	0.0748	0.0020	1.8009	0.0489	0.1744	0.0015	1065	53.7	1046	17.8	1037	8.5	99%	0.8
8	255.1	387.6	0.0815	0.0017	1.8384	0.0389	0.1638	0.0019	1235	40.7	1059	13.9	978	10.8	91%	0.7
9	24.3	46.0	0.0779	0.0037	1.6788	0.0743	0.1584	0.0024	1144	94.0	1001	28.2	948	13.1	94%	0.5
10	69.4	108.6	0.0752	0.0023	1.7235	0.0509	0.1667	0.0021	1076	66.8	1017	19.0	994	11.4	97%	0.6
11	191.8	224.3	0.1251	0.0062	3.1623	0.1500	0.1829	0.0026	2031	88.4	1448	36.6	1083	14.1	71%	0.9
12	86.7	148.7	0.0728	0.0018	1.6090	0.0407	0.1598	0.0016	1009	46.1	974	15.9	956	8.7	98%	0.6
13	21.6	46.1	0.0707	0.0027	1.5860	0.0591	0.1643	0.0022	948	77.8	965	23.2	981	12.1	98%	0.5
14	398.8	364.1	0.0806	0.0024	1.9030	0.0515	0.1714	0.0018	1211	63.1	1082	18.0	1020	10.0	94%	1.0
15	148.9	350.2	0.0706	0.0016	1.6000	0.0390	0.1639	0.0017	946	46.3	970	15.2	978	9.5	99%	0.4
16	125.6	309.5	0.0721	0.0016	1.6919	0.0414	0.1694	0.0018	987	44.4	1005	15.6	1009	10.1	99%	0.4
17	133.4	331.0	0.0764	0.0015	1.9491	0.0441	0.1840	0.0022	1106	4.6	1098	15.2	1089	12.0	99%	0.4
18	23.2	24.5	0.1539	0.0043	8.6054	0.2665	0.4066	0.0077	2391	46.8	2297	28.2	2199	35.1	95%	1.1
19	117.2	283.1	0.0989	0.0019	3.7590	0.1331	0.2690	0.0065	1606	36.0	1584	28.4	1536	33.1	96%	0.4
20	486.2	421.7	0.1856	0.0049	8.8528	0.3515	0.3386	0.0058	2703	42.4	2323	36.3	1880	28.1	78%	1.2
21	155.2	293.0	0.1400	0.0038	6.4504	0.1624	0.3339	0.0042	2227	47.2	2039	22.2	1857	20.5	90%	0.5
22	83.6	145.9	0.1386	0.0030	7.0287	0.1633	0.3676	0.0047	2210	37.0	2115	20.7	2018	22.2	95%	0.6
23	140.2	284.5	0.1396	0.0027	7.6308	0.1719	0.3957	0.0051	2222	34.0	2188	20.3	2149	23.4	98%	0.5
24	151.3	252.6	0.1281	0.0022	5.6598	0.1365	0.3186	0.0054	2073	30.1	1925	20.9	1783	26.6	92%	0.6
25	171.2	257.2	0.1386	0.0024	7.3239	0.1367	0.3818	0.0042	2210	30.6	2152	16.7	2084	19.8	96%	0.7
26	104.3	234.2	0.1360	0.0023	7.2089	0.1302	0.3823	0.0031	2176	29.0	2138	16.2	2087	14.6	97%	0.4
27	71.7	122.0	0.1676	0.0031	11.0887	0.2050	0.4791	0.0043	2600	31.3	2531	17.3	2524	18.8	99%	0.6
样品D0121-((安山质熔结凝灰岩）
1	26.0	40.1	0.0688	0.0034	1.5889	0.0755	0.1698	0.0026	892	101.9	966	29.6	1011	14.1	95%	0.6
2	23.7	36.5	0.0743	0.0036	1.6602	0.0719	0.1647	0.0023	1050	97.4	993	27.4	983	12.8	98%	0.6
3	53.9	68.9	0.0730	0.0025	1.6638	0.0562	0.1655	0.0022	1017	70.4	995	21.4	987	12.2	99%	0.8
4	37.3	57.3	0.0708	0.0025	1.6741	0.0592	0.1719	0.0023	954	77.9	999	22.5	1023	12.6	97%	0.7
5	47.9	60.7	0.0758	0.0026	1.7500	0.0608	0.1676	0.0022	1100	74.2	1027	22.5	999	12.0	97%	0.8
6	79.9	79.7	0.0799	0.0028	1.9379	0.0667	0.1759	0.0022	1194	68.5	1094	23.1	1044	11.8	95%	1.0
7	32.1	58.8	0.0751	0.0026	1.7627	0.0624	0.1703	0.0021	1072	70.4	1032	23.0	1014	11.7	98%	0.5
8	22.1	35.7	0.0809	0.0035	1.9082	0.0808	0.1726	0.0026	1220	84.4	1084	28.2	1027	14.3	94%	0.6
9	59.9	68.7	0.0743	0.0024	1.7052	0.0574	0.1659	0.0018	1050	65.3	1010	21.6	990	9.9	97%	0.9
10	25.3	44.8	0.0847	0.0038	2.0321	0.0924	0.1734	0.0022	1309	87.0	1126	31.0	1031	12.3	91%	0.6
11	32.8	48.2	0.0796	0.0029	1.8321	0.0681	0.1672	0.0023	1187	71.5	1057	24.4	996	12.6	94%	0.7
12	94.7	100.0	0.0729	0.0024	1.6457	0.0502	0.1638	0.0019	1013	64.8	988	19.3	978	10.3	98%	0.9
13	309.6	329.9	0.0695	0.0014	1.7046	0.0338	0.1767	0.0017	917	41.5	1010	12.7	1049	9.4	96%	0.9
14	60.7	85.0	0.0766	0.0024	1.7910	0.0574	0.1686	0.0021	1111	58.3	1042	20.9	1004	11.7	96%	0.7
15	58.8	64.4	0.0722	0.0028	1.6749	0.0657	0.1670	0.0021	992	81.5	999	25.0	996	11.7	99%	0.9
16	48.3	59.1	0.0725	0.0028	1.6205	0.0619	0.1629	0.0021	1011	77.8	978	24.0	973	11.4	99%	0.8
17	14.2	261.1	0.0805	0.0020	1.7821	0.0512	0.1607	0.0027	1209	49.7	1039	18.7	961	15.1	92%	0.1
18	189.8	408.9	0.0917	0.0016	3.1419	0.0599	0.2475	0.0026	1461	33.5	1443	14.7	1425	13.4	98%	0.5
19	717.7	529.7	0.0731	0.0015	1.5121	0.0328	0.1492	0.0015	1017	41.2	935	13.3	896	8.2	95%	1.4
20	182.3	230.4	0.0758	0.0015	2.1119	0.0413	0.2011	0.0017	1100	39.4	1153	13.5	1181	9.0	97%	0.8
21	111.9	850.8	0.0903	0.0014	3.6421	0.0722	0.2906	0.0042	1432	29.6	1559	15.8	1645	21.0	94%	0.1
22	771.1	501.8	0.0793	0.0015	1.6308	0.0316	0.1482	0.0012	1189	38.1	982	12.2	891	6.6	90%	1.5
23	123.3	268.1	0.0824	0.0016	2.4543	0.0512	0.2156	0.0019	1255	38.9	1259	15.1	1259	10.2	99%	0.5
24	201.0	149.5	0.0779	0.0018	2.0826	0.0558	0.1930	0.0020	1144	46.3	1143	18.4	1138	10.9	99%	1.3

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滇中峨山地区中元古界昆阳群黑山头组火山岩锆石U-Pb年龄及其地质意义

1. 云南省地质调查院, 云南 昆明 650216 2. 云南省环境监测院, 云南 昆明 650216 3. 昆明理工大学国土资源工程学院, 云南 昆明 650093

作者简介: 刘军平(1983-), 男, 硕士, 高级工程师, 从事区域地质与构造地质调查研究。E-mail:271090834@qq.com

通讯作者: 曾文涛(1971-), 男, 学士, 高级工程师, 从事区域地质调查及技术管理工作。E-mail:ynhjyzwt@163.com

U-Pb age of zircons of the volcanic rocks from Heishantou Formation of Mesoproterozoic Kunyang Group in Eshan County, central Yunnan Province, and its geological significance

1. Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China 2. Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China 3. Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Corresponding author: ZENG Wentao, ynhjyzwt@163.com

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出版历程

目录

1.
云南省地质调查院, 云南昆明 650216

2.
云南省环境监测院, 云南昆明 650216

3.
昆明理工大学国土资源工程学院, 云南昆明 650093

1.
Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China

2.
Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China

3.
Kunming University of Science and Technology, Kunming 650093, Yunnan, China