滇中易门地区约1.85Ga凝灰岩的厘定及其地质意义

刘军平; 曾文涛; 徐云飞; 孙柏东; 胡绍斌; 刘桂春; 宋冬虎; 吕勃烨; 王晓峰

滇中易门地区约1.85Ga凝灰岩的厘定及其地质意义

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》 DD20160017

《云南区域地质调查片区总结与服务产品开发》 DD20160345-02

详细信息

作者简介:
刘军平(1983-), 男, 硕士, 高级工程师, 从事基础地质调查研究工作。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;P588.14
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- 文章访问数: 2521
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出版历程
- 收稿日期: 2018-03-19
- 修回日期: 2018-06-24
- 网络出版日期: 2023-08-15
- 刊出日期: 2018-11-14

The definition and geological significance of tuffs about 1.85Ga in Yimen area, central Yunnan Province

1.
Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China
2.
Yunnan Provincial Institute of Environmental Monitoring, Kunming 650216, Yunnan, China
3.
Kunming University of Science and Technology, Kunming 650093, Yunnan, China

摘要

摘要:
在滇中易门-罗茨断裂带以西前人划分的昆阳群美党组中发现了大量的中酸性凝灰岩。采用锆石激光剥蚀法（LAICP-MS）对易门县铜厂一带的英安质凝灰岩、石英晶屑凝灰岩进行了年龄测定，获得锆石U-Pb年龄加权平均值为1842±26Ma（MSWD=7.6，n=29）和1860±25Ma（MSWD=2.5，n=11）。2件样品的锆石Th/U值为0.2~1.0，且均具清晰的振荡环带结构，为岩浆成因锆石。该套凝灰岩产于一套厚度超过1000m的火山-细碎屑岩组合中，其下发育厚约800m的黑色板岩-碳酸盐岩组合，表明滇中易门地区存在厚度超过2000m的古元古界。此年龄值与全球性的Columbia超大陆事件一致，所以，在进行Columbia超大陆重建时需要充分考虑扬子陆块的位置及意义。
- 古元古界 /
- 锆石U-Pb年龄 /
- 滇中易门地区 /
- Columbia超大陆重建
Abstract:
Medium-acid tuff was extensively found in Meidang Formation of Kunyang Group, which was determined by previous researchers in the west of Yimen-Luoci faults belt. Using the zircon laser denudation method (LA-ICP-MS), the authors obtained weighted average ages of 1842±26Ma (MSWD=7.6, n=29) and 1860±25Ma (MSWD=2.5, n=11) from dacitic tuff and quartz crystal tuff in Tongchang area, Yimen County, central Yunnan Province. Th/U ratios of zircon, which was of magmatic origin and with clear vibration band, were obtained from two samples (0.2~1.0). The tuff was found from a volcanic-microclastic rock assembly, which is over 1000m in thickness. There is a black slate-carbonate rock assembly, which is about 800m in thickness, under the volcanic-microclastic rock assembly. It is thus inferred that there is a large area of Paleoproterozoic strata, which are over 2000m in thickness in Yimen area of central Yunnan Province. The ages coincide with Columbia Supercontinent, and hence Yangtze block's location and significance ought to be taken into account in the reconstruction process of Columbia Supercontinent.
- Paleoproterozoic /
- zircon U-Pb age /
- Yimen area of central Yunnan Province /
- reconstruction process of Columbia Supercontinent

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致谢: 锆石LA-ICP-MS分析和阴极发光照片得到南京宏创地质勘查技术服务有限公司袁秋云及湖北省地质实验室测试中心岩石矿物研究室朱丹、潘诗洋的帮助，审稿专家提出了宝贵的修改意见，在此一并表示衷心感谢。

图 1 采样剖面的地层柱（a）、样品D002野外露头（b）及显微照片（c）、样品D001野外露头（d）及显微照片（e）

Figure 1. Stratigraphic column of sampling (a), sample D002 (b) and microphotograph (c), sample D001(d) and microphotograph (e)

下载: 全尺寸图片幻灯片

图 2 石英晶屑凝灰岩（a）及英安质凝灰岩（b）代表性锆石阴极发光（CL）图像

Figure 2. CL images of zircons from quartz crystal tuff(a)and dacitic tuff (b)

下载: 全尺寸图片幻灯片

图 3 样品D001和D002锆石U-Pb谐和图（a组代表其成岩年龄）

Figure 3. U-Pb ages of zircons from sample D001 and D002

下载: 全尺寸图片幻灯片

表 1 LA-ICP-MS锆石U-Th-Pb同位素分析数据

Table 1 LA-ICP-MS zircon U-Th-Pb data

测号	Th/U	同位素比值						年龄/Ma
测号	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵Pb	1σ	²⁰⁶Pb/²³⁸Pb	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵Pb	1σ	²⁰⁶Pb/²³⁸Pb	1σ
1	0.6	0.1382	0.0016	8.3694	0.1011	0.4363	0.0027	2206	20.4	2272	11.1	2334	12.2
2	0.8	0.1352	0.0016	7.7280	0.0937	0.4124	0.0027	2169	20.8	2200	11.0	2226	12.2
3	0.3	0.1118	0.0012	5.2939	0.0553	0.3407	0.0018	1829	19.6	1868	9.0	1890	8.7
4	0.8	0.1388	0.0016	8.1023	0.0943	0.4202	0.0025	2213	19.8	2243	10.6	2261	11.6
5	1.0	0.1548	0.0017	10.3969	0.1136	0.4833	0.0028	2400	18.5	2471	10.3	2542	12.4
6	0.5	0.1134	0.0014	5.4495	0.0648	0.3462	0.0022	1854	21.8	1893	10.3	1916	10.7
7	0.9	0.1343	0.0017	7.5660	0.095	0.4053	0.0026	2155	21.9	2181	11.4	2194	12.2
8	0.4	0.1207	0.0017	6.1097	0.0841	0.3643	0.0025	1966	24.2	1992	12.1	2003	11.8
9	0.7	0.1335	0.0019	7.4084	0.1053	0.4002	0.003	2144	24.5	2162	12.8	2170	13.7
10	0.4	0.1110	0.0014	5.2606	0.0658	0.3409	0.0022	1816	22.1	1862	10.7	1891	10.4
11	0.3	0.1132	0.0015	5.3696	0.0694	0.3418	0.0021	1851	24.2	1880	11.1	1895	10.3
12	0.4	0.1265	0.0016	6.6901	0.0870	0.3816	0.0026	2050	22.4	2071	11.6	2084	12
13	0.3	0.1157	0.0016	5.4813	0.0748	0.3415	0.0022	1891	25.2	1898	11.8	1894	10.6
14	0.7	0.1385	0.0021	7.9141	0.1187	0.4127	0.0030	2209	25.9	2221	13.6	2227	13.7
15	0.5	0.1282	0.0019	6.8340	0.1042	0.3850	0.0028	2074	26.5	2090	13.6	2099	13.0
16	1.0	0.1394	0.0026	7.8294	0.1435	0.4073	0.0035	2220	31.8	2212	16.6	2202	16.1
17	0.3	0.1257	0.0020	6.7690	0.1124	0.3889	0.0029	2039	34.1	2082	14.8	2118	13.7
18	0.9	0.1181	0.0020	5.8035	0.0989	0.3549	0.0028	1928	29.8	1947	14.8	1958	13.3
19	0.3	0.1142	0.0017	5.4429	0.0801	0.3437	0.0023	1933	25.9	1892	12.7	1904	11.1
20	1.0	0.1171	0.0017	5.7942	0.0878	0.3570	0.0026	1922	25.8	1946	13.2	1968	12.6
21	0.7	0.1190	0.0018	6.0879	0.0972	0.3687	0.0027	1940	27.9	1989	14.0	2023	12.8
22	0.4	0.1110	0.0018	5.3492	0.0882	0.3475	0.0026	1817	28.6	1877	14.2	1923	12.4
23	0.6	0.1288	0.0023	7.1069	0.1268	0.3982	0.0033	2081	36.3	2125	15.9	2161	15.2
24	0.3	0.1251	0.0023	6.4311	0.1210	0.3704	0.0031	2031	31.9	2037	16.6	2031	14.6
25	0.2	0.1181	0.0018	5.9243	0.0915	0.3610	0.0026	1928	26.7	1965	13.5	1987	12.2
26	0.4	0.1136	0.0017	5.3546	0.0812	0.3398	0.0024	1857	27.5	1878	13.0	1886	11.5
27	0.3	0.1253	0.0018	6.6377	0.0977	0.3815	0.0027	2035	25.9	2064	13.1	2083	12.6
28	0.7	0.1338	0.0019	7.5402	0.1080	0.4056	0.0028	2150	25.0	2178	12.9	2195	12.7
29	0.6	0.1296	0.0020	7.1867	0.1101	0.3999	0.0029	2092	27.9	2135	13.7	2168	13.6
30	0.9	0.1605	0.0025	10.6557	0.1636	0.4780	0.0035	2461	25.9	2494	14.3	2518	15.4
31	0.5	0.1223	0.0018	6.1429	0.0859	0.3622	0.0026	1991	25.9	1996	12.3	1993	12.2
32	0.7	0.1119	0.0018	5.1603	0.0827	0.3331	0.0027	1831	25.0	1846	13.7	1853	13.1
33	0.7	0.1358	0.0017	7.5805	0.0954	0.4018	0.0028	2176	21.1	2183	11.4	2178	12.9
34	0.5	0.1397	0.0018	7.9728	0.1031	0.4114	0.0030	2233	22.2	2228	11.8	2221	13.7
35	0.5	0.1158	0.0014	5.4629	0.0686	0.3393	0.0021	1892	22.5	1895	10.9	1883	10.1
36	0.3	0.1161	0.0014	5.5639	0.0667	0.3446	0.0021	1898	22.2	1911	10.4	1909	10.1
样品D002（英安质凝灰岩）
1	0.7	0.1409	0.0021	8.0011	0.1425	0.4123	0.0061	2239	25.9	2231	16.1	2225	27.7
2	0.8	0.1135	0.0019	5.0138	0.0992	0.3212	0.0053	1857	31.2	1822	16.8	1796	26.0
3	0.7	0.1119	0.0019	5.2508	0.1093	0.3413	0.0062	1831	31.2	1861	17.8	1893	30.0
4	0.5	0.1180	0.0015	5.8548	0.1007	0.3600	0.0057	1928	23.3	1955	15.0	1982	27.2
5	0.5	0.1106	0.0018	4.9070	0.0999	0.3220	0.0053	1809	25.0	1803	17.2	1799	26.1
6	0.5	0.1137	0.0019	5.3428	0.1229	0.3401	0.0055	1858	36.1	1876	19.7	1887	26.3
7	0.5	0.1107	0.0017	5.2445	0.1053	0.3439	0.0063	1813	27.9	1860	17.2	1906	30.4
8	0.6	0.1125	0.0019	5.0557	0.1008	0.3262	0.0056	1840	30.2	1829	16.9	1820	27.3
9	0.9	0.1180	0.0018	5.8482	0.1163	0.3596	0.0065	1928	27.6	1954	17.3	1980	30.8
10	0.5	0.1121	0.0021	5.1119	0.1224	0.3311	0.0065	1833	67.4	1838	20.4	1844	31.7
11	0.7	0.1116	0.0015	5.1392	0.0868	0.3344	0.0057	1828	19.9	1843	14.4	1860	27.5
12	0.5	0.1497	0.0018	8.8076	0.1652	0.4256	0.0070	2343	19.3	2318	17.2	2286	31.7
13	0.6	0.1104	0.0018	5.4049	0.1133	0.3563	0.0076	1806	29.8	1886	18.0	1965	36.0
14	0.8	0.1091	0.0015	5.3071	0.0985	0.3527	0.006	1784	25.5	1870	15.9	1947	28.6
15	1.1	0.1503	0.0017	9.3232	0.1306	0.4498	0.0063	2349	18.7	2370	12.9	2395	28.1
16	0.5	0.1094	0.0017	5.0522	0.0882	0.3354	0.0053	1791	27.5	1828	14.8	1864	25.4
17	1.0	0.1188	0.0017	5.6021	0.1180	0.3423	0.0062	1939	27.0	1916	18.2	1898	29.8
18	1.1	0.1197	0.0020	5.8455	0.1253	0.3532	0.0052	1951	29.6	1953	18.6	1950	24.8
19	0.7	0.1299	0.0044	5.9000	0.2902	0.3236	0.0066	2098	65.3	1961	42.7	1807	32.0
20	0.6	0.1149	0.0018	5.6593	0.1031	0.3570	0.0052	1880	28.4	1925	15.8	1968	24.9
21	0.9	0.1165	0.0016	5.7564	0.0970	0.3573	0.0046	1903	24.1	1940	14.6	1969	22.1
22	0.6	0.1081	0.0015	4.9254	0.0944	0.3291	0.0047	1769	25.9	1807	16.2	1834	23.1
23	0.7	0.1090	0.0018	4.9367	0.1036	0.3288	0.0066	1783	29.6	1809	17.8	1832	32.2
24	0.7	0.1096	0.0018	5.2081	0.1064	0.3437	0.0061	1794	34.3	1854	17.5	1904	29.1
25	0.6	0.1106	0.0016	4.8923	0.0953	0.3201	0.0054	1809	26.1	1801	16.5	1790	26.2
26	0.7	0.1090	0.0016	4.8577	0.0814	0.3227	0.0048	1784	21.5	1795	14.2	1803	23.3
27	0.6	0.1114	0.0018	4.9448	0.0994	0.3212	0.0052	1821	27.6	1810	17.0	1796	25.2
28	0.5	0.1100	0.0015	5.0148	0.0811	0.3303	0.0048	1800	25.3	1822	13.7	1840	23.5
29	0.6	0.1097	0.0019	4.8976	0.1133	0.3227	0.0055	1795	31.5	1802	19.5	1803	26.7
30	0.5	0.1447	0.0019	8.8696	0.1294	0.4437	0.0057	2284	22.5	2325	13.4	2367	25.3
31	1.6	0.1413	0.0019	7.9721	0.1326	0.4084	0.0061	2244	56.6	2228	15.1	2208	28.2
32	0.6	0.1109	0.0016	4.8997	0.0913	0.3193	0.0046	1815	25.6	1802	15.8	1786	22.5
33	0.5	0.1150	0.0017	5.0421	0.0956	0.3170	0.0047	1880	26.4	1826	16.1	1775	23.1
34	1.5	0.1524	0.0024	9.3652	0.1780	0.4471	0.0089	2373	26.9	2374	17.5	2382	39.6
35	0.6	0.1374	0.0019	7.6226	0.1373	0.4017	0.0061	2195	23.0	2188	16.2	2177	28.1
36	0.8	0.1216	0.0012	6.0853	0.0853	0.3617	0.0041	1981	18.2	1988	12.3	1990	19.6
37	0.8	0.1181	0.0013	5.5635	0.0811	0.3408	0.0040	1928	19.8	1910	12.6	1891	19.4

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