扬子板块西南部古元古代岩浆及变质事件——兼论扬子板块对Nuna超大陆事件的响应

张恒; 高林志; 张传恒; 丁孝忠; 李廷栋; 宋彪; 刘昊岗; 龚成强; 张继彪

扬子板块西南部古元古代岩浆及变质事件——兼论扬子板块对Nuna超大陆事件的响应

1.
中国地质科学院地质研究所, 北京 100037

2.
中国地质大学(北京), 北京 100083

基金项目:
中国地质调查局项目《全国地质构造区划与区域地质调查综合集成》（编号：DD20160345）和《中国及邻区海陆大地构造研究和相关图件编制》（编号：DD20160343）

详细信息

作者简介: 张恒(1985-), 男, 博士, 助理研究员, 从事前寒武纪地层与大地构造研究。E-mail:heng0520@126.com

通讯作者: 高林志(1955-), 男, 研究员, 从事生物地层、层序地层、灾变事件地层研究。E-mail:gaolzh@cags.ac.cn

中图分类号: P534.3;P588.11;P588.3

收稿日期: 2019-01-10

修回日期: 2019-08-13

刊出日期: 2019-11-15

Paleoproterozoic magmatic and metamorphic events in southwestern Yangtze Block: The position and evolution of the Yangtze Block within the Nuna supercontinent

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: GAO Linzhi, gaolzh@cags.ac.cn

Received Date: 10 January 2019

Revised Date: 13 August 2019

Publish Date: 15 November 2019

摘要

摘要:
寻找扬子板块西南地区古老结晶基底一直是众多地质学者追寻的目标，其涉及扬子板块在Nuna超大陆重建中的位置和演化过程，也是前寒武纪研究的重要课题。继在扬子板块西南部中国云南石屏撮科村首次报道2.35Ga花岗片麻岩结晶基底后，又在撮科村-高家坡一带3个花岗岩样品中分别获得了2347.3±4.9Ma、2324.3±8.6Ma和2329.4±5.9Ma的SHRIMP锆石U-Pb年龄，进一步确认扬子板块西南部中国境内存在2.32~2.35Ga的岩浆事件，其应为Nuna超大陆汇聚期Arrowsmith造山事件在扬子板块的响应。另在1件糜棱岩化花岗闪长岩样品中获得了1909.8±5.7Ma和1843.1±7.6Ma两组年龄，在扬子板块西南部中国境内首次发现1.90Ga和1.84Ga的构造或变质事件。结合前人研究成果，确定扬子板块西南部存在2.91~2.84Ga，2.36~2.32Ga，2.28~2.19Ga的岩浆事件，以及1.97~1.95Ga，1.90Ga，1.84~1.83Ga的变质事件，为确定扬子板块在Nuna超大陆重建中的位置提供了更多证据。
- 扬子板块 /
- Nuna超大陆 /
- 滇中地区 /
- 结晶基底
Abstract:
The search for crystalline basement outcrops in the southwestern portion of the Yangtze Block has been the study object of many geologists, and the position and the evolution of the Yangtze Block within the Precambrian supercontinent of Nuna have also been an important research subject. In this study, SHRIMP zircon U-Pb dating was conducted for three granite samples underlying the Kunyang Group and, as a result, the weighted mean ²⁰⁷Pb/²⁰⁶Pb ages of 2347.3±4.9Ma, 2324.3±8.6Ma, and 2329.4±5.9Ma were obtained respectively. These data further confirm that there were 2.32~2.35Ga magmatic events in the southwest Yangtze plate, which were the response of the Yangtze Block to the Arrowsmith orogenic event with the assembly of the Nuna supercontinent. Especially a sample yielded weighted mean ²⁰⁷Pb/²⁰⁶Pb ages of 1909.8±5.7Ma and 1843.1±7.6Ma, which indicate for the first time the existence of two periods of metamorphism respectively at 1.90Ga and 1.84Ga in the southwestern portion of the Yangtze Block. Along with previous researches, the authors have reached the conclusion that there were 2.91~2.84Ga, 2.36~2.32Ga and 2.28~2.19Ga magmatic events and 1.97~1.95Ga, 1.90Ga and 1.84~1.83Ga metamorphic events in the southwest Yangtze Block. These data provide important evidence for ascertaining the position and the evolution of the Yangtze Block within the supercontinent of Nuna.
- Yangtze Block /
- Nuna supercontinent /
- central Yunnan Province /
- crystalline basement

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图 1 扬子板块古、中元古代及太古宙地层分布图（a）和研究区区域地质简图（b）（据参考文献[19-20]修改）

Figure 1.

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图 2 扬子板块西南部古、中元古代年代地层格架及对比简图

Figure 2.

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图图版Ⅰ

Figure 图版Ⅰ.

下载: 全尺寸图片幻灯片

图 3 撮科村古元古代糜棱岩化花岗岩锆石阴极发光图像

Figure 3.

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图 4 撮科村古元古代糜棱岩化花岗岩样品锆石U-Pb谐和图

Figure 4.

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图 5 花岗闪长岩样品SP19-4锆石²⁰⁷Pb/²⁰⁶Pb年龄和U含量关系图

Figure 5.

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图 6 扬子板块北部和西南部碎屑锆石U-Pb年龄（≥1700Ma）汇总图（据参考文献[44]修改）

Figure 6.

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表 1 糜棱岩化花岗岩SHRIMP锆石U-Th-Pb同位素测定结果

Table 1. SHRIMP U-Th-Pb isotopic compositions for zircons from granite

测点	²⁰⁶Pb_c/%	U/10^-6	Th/10^-6	²³²Th/²³⁸U	²⁰⁰Pb/10^-6	²⁰⁶Pb/²³⁸U年龄/Ma	²⁰⁷Pb/²⁰⁶Pb年龄/Ma	不谐和度/%	²⁰⁷Pb^/²⁰⁶Pb^	±%	²⁰⁷Pb*/²³⁵U	±%	²⁰⁶Pb^*/²³⁸U	±%	误差相关系数
SP19-1
1.1	0.01	604	98	0.17	225	2323+29	2319.0+8.3	0	0.14766	0.49	8.83	1.6	0.4338	1.5	0.951
2.1	0.01	860	195	0.23	331	2386+29	2348.6+7.2	-2	0.15023	0.42	9.28	1.5	0.4479	1.5	0.962
3.1	0.00	1085	230	0.22	411	2352+29	2313.6+6.6	2	0.14719	0.39	8.93	1.5	0.4402	1.5	0.967
4.1	0.05	299	99	0.34	114	2367+31	2345+11	-1	0.14990	0.64	9.17	1.7	0.4436	1.5	0.923
5.1	0.18	432	154	0.37	153	2217+28	2287+11	3	0.14492	0.62	8.20	1.6	0.4104	1.5	0.925
6.1	-	595	124	0.21	228	2374+32	2359.6+8.1	1	0.15120	0.48	9.28	1.7	0.4453	1.6	0.958
7.1	--	508	278	0.56	195	2379+30	2357.2+8.8	-1	0.15099	0.52	9.29	1.6	0.4463	1.5	0.946
8.1	0.01	840	141	0.17	316	2341士29	2335.517.6	0	0.14909	0.44	9.00	1.5	0.4379	1.5	0.957
9.1	0.03	662	170	0.27	245	2306+29	2319.2+8.2	1	0.14768	0.48	8.76	1.6	0.4302	1.5	0.952
10.1	--	427	120	0.29	161	2351+35	2346+13	0	0.1500	0.78	9.10	1.9	0.4400	1.8	0.916
11.1	0.03	2063	652	0.33	663	2048士26	2367.2+6.0	13	0.15188	0.35	7.83	1.5	0.3741	1.5	0.973
12.1	0.02	350	310	0.92	157	2702+34	2716.1+8.5	1	0.18701	0.52	13.43	1.6	0.5208	1.5	0.947
13.1	0.02	938	219	0.24	337	2253+28	2297.417.3	2	0.14582	0.42	8.41	1.6	0.4185	1.5	0.962
14.1	0.01	1013	624	0.64	390	2386+29	2342.7+6.7	-2	0.14972	0.39	9.24	1.5	0.4478	1.5	0.966
15.1	0.00	962	154	0.17	368	2373+29	2349.8+6.7	-1	0.15034	0.39	9.23	1.5	0.4451	1.5	0.966
16.1	0.03	602	258	0.44	231	2382+30	2343.848.0	-2	0.14982	0.47	9.23	1.6	0.4470	1.5	0.954
17.1	0.06	464	257	0.57	175	2348+30	2352.8+9.2	0	0.15060	0.54	9.12	1.6	0.4394	1.5	0.942
18.1	0.01	635	353	0.57	240	2351+29	2342.6+8.0	0	0.14971	0.47	9.08	1.6	04401	1.5	0.955
SP19-4
1.1	0.19	1321	329	0.26	361	1776+26	1842.0+8.5	4	0.11261	0.47	4.924	1.7	0.3171	1.7	0.963
2.1	0.01	1997	385	0.20	584	1889+27	1915.8+6.2	1	0.11732	0.35	5.508	1.7	0.3405	1.7	0.979
3.11	0.00	1781	330	0.19	503	1834+27	1964.616.4	7	0.12057	0.36	5.470	1.7	0.3291	1.7	0.977
4.1	0.03	668	155	0.24	209	2004+29	2024.5+8.7	1l	0.12469	0.49	6.27	1.7	0.3646	1.7	0.959
5.1	0.07	468	150	0.33	141	1942+29	1912+11	-2	0.11710	0.62	5.68	1.8	0.3516	1.7	0.940
6.1	0.03	2212	833	0.39	644	1882+27	1902..3+6.2	1	0.11644	0.34	5.442	1.7	0.3390	1.7	0.979
7.1	0.05	1844	307	0.17	599	2066+29	2262.4+5.8	9	0.14288	0.34	7.44	1..7	0.3779	1.7	0.980
8.1	0.02	1662	613	0.38	502	1943+28	1911.5+6.6	-2	0.11704	0.37	5.676	1.7	0.3517	1.7	0.977
9.1	0.03	946	188	0.21	342	2266+32	2316.86.9	2	0.14747	0.40	8.56	1.7	0.4212	1.7	0.972
10.1	0.05	810	123	0.16	306	2346+34	2331.7+8.6	-1	0.14876	0.50	9.00	1.8	0.4389	1.8	0.961
11.1	0.47	4821	1610	0.34	779	1106+17	1497+12	26	0.09343	0.66	2.412	1.8	0.1872	1.7	0.930
12.1	0.01	3726	1734	0.48	1030	1801+26	1843.7+5.5	2	0.11272	0.30	5.011	1.7	0.3224	1.7	0.984
13.1	0.07	2449	909	0.38	640	1710+25	1843.0+6.7	7	0.11267	0.37	4.719	1.7	0.3038	1.7	0.976
14.1	0.02	1828	513	0.29	520	1844+27	1904.3+6.5	3	0.11657	0.36	5.324	1.7	0.3312	1.7	0.977
15.1	0.68	4483	2579	0.59	778	1178+18	1586410	26	0.09798	0.56	2.710	1.8	0.2006	1.7	0.948
16.1	0.02	3803	1774	0.48	958	1 658+24	1784.0+5.9	7	0.10908	0.32	4.410	1.7	0.2932	1.7	0.982
17.1	0.04	825	189	0.24	310	2338+33	2327.2+7.1	0	0.14837	0.41	8.94	1.7	0.4373	1.7	0.971
18.1	0.03	942	191	0.21	275	1884+28	1916.848.2	2	0.11739	0.46	5.494	1.7	0.3395	1.7	0.965
SP19-5
1.1	0.04	1539	373	0.25	521	2141+31	2302.916.1	7	0.14628	0.35	7.94	1.7	0.3938	1.7	0.978
2.1	0.14	316	89	0.29	110	2187+32	2296+12	5	0.14569	0.68	8.11	1.9	0.4039	1.7	0.931
3.1	0.18	1100	248	0.23	346	2010+29	2289.2+7.6	12	0.14512	0.44	7.32	1.7	0.3659	1.7	0.967
4.1	0.06	565	189	0.34	212	2334+33	2334.0+8.2	0	0.14895	0.48	8.96	1.8	0.4363	1.7	0.963
5.1	0.04	490	219	0.46	182	2312+33	2328.5+9.0	1	0.14848	0.52	8.83	1.8	0.4313	1.7	0.956
6.1	0.03	384	131	0.35	141	2291+33	2324.319.4	1	0.14812	0.55	8.71	1.8	0.4266	1.7	0.953
7.1	0.17	626	186	0.31	217	2182+32	2308.918.7	5	0.14679	0.51	8.15	1.8	0.4029	1.7	0.958
8.1	0.07	1729	392	0.23	462	1743+26	2230.016.6	22	0.14023.	0.38	6.00	1.7	0.3106	1.7	0.976
9.1	0.02	616	85	0.14	221	2249132	2326.3+8.1	3	0.14829	0.47	8.53	1.8	0.4174	1.7	0.964
10.1	0.02	1190	236	0.20	435	2283+32	2326.0+6.3	2	0.14826	0.37	8.69	1.7	0.4251	1.7	0.977
11.1	0.05	1998	140	0.07	667	2115131	2280.8+5.9	7	0.14441	0.34	7.73	1.7	0.3884	1.7	0.980
12.1	0.07	720	191	0.27	233	2056+29	2248.4+7.8	9	0.14173	0.45	7.34	1.7	0.3756	1.7	0.965
13.1	0.03	856	155	0.19	293	2160+31	2302.9+7.2	6	0.14628	0.42	8.03	1.7	0.3980	1.7	0.971
14.1	0.05	500	151	0.31	186	2315+33	2329.8+8.6	1	0.14859	0.50	8.85	1.8	0.4320	1.7	0.959
15.1	0.05	2001	805	0.42	412	1383+21	2068.7+7.2	33	0.12786	0.41	4.220	1.7	0.2394	1.7	0.972
16.1	0.02	1606	320	0.21	541	2133+30	2302.8+6.0	7	0.14627	0.35	7.91	1.7	0.3922	1.7	0.979
17.1	0.07	340	143	0.43	124	2283+33	2329+11	2	0.14853	0.63	8.70	1.8	0.4249	1.7	0.940
18.1	0.04	580	202	0.36	211	2274133	2338.1+8.1	3	0.14932	0.48	8.71	1.8	0.4231	1.7	0.963

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