滇西勐库地区退变质榴辉岩锆石U-Pb年龄及其地质意义

孙载波; 李静; 周坤; 曾文涛; 吴嘉林; 胡绍斌; 刘桂春; 赵江泰

滇西勐库地区退变质榴辉岩锆石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.
自然资源部三江成矿作用及资源勘查利用重点实验室, 云南昆明 650061

3.
云南省地质环境监测院, 云南昆明 650216

基金项目:
中国地质调查局项目《云南1：5万香竹林等七幅区域地质调查》（编号：121201010000150007）、《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: 孙载波(1981-), 男, 硕士, 高级工程师, 从事区域地质调查与研究工作。E-mail:ynddyszb@163.com

通讯作者: 李静(1964-), 男, 硕士, 教授级高工, 从事区域地质调查及技术管理工作。E-mail:lijing641229@163.com

中图分类号: P588.3;P597⁺.3

收稿日期: 2018-02-02

修回日期: 2018-05-20

刊出日期: 2018-11-15

Zircon U-Pb age and geological significance of retrograded eclogites from Mengku area in western Yunnan Province

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

2.
Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650061, Yunnan, China

3.
Yunnan Institute of Geological Environment Monitoring, Kunming 650216, Yunnan, China

More Information

Corresponding author: LI Jing, lijing641229@163.com

Received Date: 02 February 2018

Revised Date: 20 May 2018

Publish Date: 15 November 2018

摘要

摘要:
滇西双江县勐库地区退变质榴辉岩呈构造透镜体产于湾河蛇绿混杂岩带内，该发现弥补了东特提斯造山带高压-超高压变质岩在云南境内的空缺。在岩石学观察的基础上，借助激光剥蚀等离子体质谱（LA-ICP-MS）技术，对退变质榴辉岩中的锆石开展了精确的U-Pb年龄测定。所测试的3件样品分别采自3个不同的露头：样品PM011-9-1采自勐库控角剖面，样品PM038-15-4采自勐库地界剖面，样品GH1612-1-1采自勐库根恨大寨。测年结果显示，样品PM011-9-1的23个测点中存在2组较集中的²⁰⁶Pb/²³⁸U年龄，分别为801.0±9.8Ma和227.0±12Ma；样品PM038-15-4的26个测点中存在2组较集中的²⁰⁶Pb/²³⁸U年龄，分别为447.5±3.6Ma和291.7±6.3Ma；样品GH1612-1-1的30个测点中存在一组较集中的²⁰⁶Pb/²³⁸U年龄，为229.0±1.3Ma。结合区域资料及锆石阴极发光图像分析，801.0±9.8Ma应属退变质榴辉岩的原岩年龄，可能代表了Rodinia超大陆裂解早期出现的初始洋壳；而447.5±3.6Ma、291.7±6.3Ma和229.0±1.3~227.0±12Ma这3组年龄可能代表了退变质榴辉岩经历的3期变质作用年龄：分别为峰期硬柱石榴辉岩相的变质作用；中期角闪石榴辉岩相-高压麻粒岩相的退变质作用，为一个降压-增温的"热折返"过程；主期角闪岩相的退变质作用，是一个大幅度的降温-减压过程，奠定了勐库地区退变质榴辉岩的主体面貌。
- 退变质榴辉岩 /
- 硬柱石榴辉岩相 /
- LA-ICP-MS锆石U-Pb定年 /
- 热折返
Abstract:
The retrograde eclogite, which is a structural lens, is located in the Wanhe ophiolitic melange zone in the Shuangjiang area of western Yunnan Province. This discovery makes up the blank that high pressure-ultra-high pressure metamorphic rocks have not been found in Yunnan for the Eastern Tethys orogeny. On the basis of petrological observation, accurate U-Pb dating was performed on the selected zircons using laser ablation plasma mass spectrometry (LA-ICP-MS). The three samples tested here were collected from three different outcrops. Sample PM011-9-1 was taken from the Kongjiao profile, sample PM038-15-4 was taken from the boundary profile of the Mengku area, and sample GH1612-1-1 was picked up from Dazha Village. The dating results show that there are two sets of ²⁰⁶Pb/²³⁸U ages in the 23 points of sample PM011-9-1, which are 801.0±9.8Ma and 227.0±12Ma; there are two groups of relatively concentrated ²⁰⁶Pb/²³⁸U ages at the 26 sites of sample PM038-15-4, which are 447.5±3.6Ma and 291.7±6.3Ma for sample GH1612-1-1, there is a group of relatively concentrated ²⁰⁶Pb/²³⁸U ages at 30 sites, being 229.0±1.3Ma. According to the zircon cathodoluminescence image and regional geological data, 801.0±9.8Ma may represent the protolith age, which is consistent with Rodinia supercontinent initial breakup; and the ages of 447.5±3.6Ma, 291.7±6.3Ma and 229.0±1.3Ma may represent the ages of retrograde eclogites which underwent three stages of metamorphism. Combined with the current research results, the authors hold that Mengku retrograde eclogite was probably formed in the Neoproterozoic, and was an initial oceanic crust of Proto-Tethys Ocean basin; Proto-Tethys Ocean basin subduction ended in the Late Ordovician, the subduction oceanic crust experienced lawsonite eclogites facies metamorphism in the mantle at the depth of ca 100~150km; in the early Permian period, large-scale eastward subduction of the Paleo-Tethys oceanic basin took place along Changning-Menlian Suture Zone; and a retrograde metamorphism of hornblende eclogites facies-high pressure granulite facies occurred, which was hot-exhumation phase of the temperature rise and pressure drop; in the Middle-Late Triassic, large-scale decompression of retrograde eclogite occurred, following the arc-continental collision orogenesis, and formed a large amount of amphibole minerals. The late retrograde metamorphism of the amphibolite facies eclogites laid the foundation for main features of retrograde eclogite in this area.
- retrograde eclogite /
- lawsonite eclogites facies /
- LA-ICP-MS zircon U-Pb dating /
- hot-exhumation

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图 1 青藏高原榴辉岩分布简图（a）及研究区地质简图（b）（据参考文献①修改）

Figure 1.

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图 2 退变质榴辉岩野外露头特征

Figure 2.

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图 3 退变质榴辉岩（PM011-9-1）锆石U-Pb年龄谐和图（a~c）和锆石阴极发光（CL）图像（d）

Figure 3.

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图 4 退变质榴辉岩（PM038-15-4）锆石U-Pb年龄谐和图（a~c）和锆石阴极发光（CL）图像（d）

Figure 4.

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图 5 退变质榴辉岩（GH1612-1-1）锆石U-Pb年龄谐和图（a）和锆石阴极发光（CL）图像（b）

Figure 5.

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表 1 退变质榴辉岩LA-ICP-MS锆石U-Th-Pb年龄测定结果

Table 1. LA-ICP-MS zircon U-Th-Pb age determinations of the retrograde eclogite

样品编号	元素含量/10^-6		Th/U	同位素比值						表面年龄/Ma
样品编号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ
PM011-9-1
1	351	398	0.88	0.0596	0.0024	0.1920	0.0077	0.0233	0.0002	587	85.2	148	1.6	178	6.6
2	261	543	0.48	0.0604	0.0021	0.2841	0.0101	0.0340	0.0004	617	76.7	216	2.3	254	8.0
3	403	554	0.73	0.0533	0.0017	0.2692	0.0087	0.0365	0.0003	339	38.0	231	2.0	242	7.0
4	162	351	0.46	0.0520	0.0021	0.2677	0.0110	0.0373	0.0005	283	92.6	236	3.0	241	8.8
5	113	226	0.50	0.0591	0.0050	0.2639	0.0207	0.0329	0.0008	572	185	209	5.2	238	16.6
6	111	225	0.49	0.0516	0.0061	0.2763	0.0229	0.0384	0.0008	333	183	243	5.3	248	18.2
7	1.84	222	0.01	0.0507	0.0037	0.2697	0.0190	0.0384	0.0009	233	164	243	5.4	242	15.2
8	72.7	78.8	0.92	0.0681	0.0026	1.2160	0.0456	0.1295	0.0015	872	79.6	785	8.7	808	20.9
9	143	208	0.69	0.0665	0.0018	1.2313	0.0325	0.1340	0.0014	820	55.6	810	7.8	815	14.8
10	83.4	133	0.63	0.0676	0.0019	1.2292	0.0322	0.1320	0.0012	857	63.9	799	7.0	814	14.7
11	251	400	0.63	0.0664	0.0015	1.2072	0.0258	0.1315	0.0012	820	53.0	796	6.6	804	11.9
12	172	111	1.55	0.0693	0.0024	1.2756	0.0467	0.1329	0.0015	909	76.9	805	8.7	835	20.9
13	136	124	1.10	0.0689	0.0021	1.2161	0.0370	0.1277	0.0012	896	67.6	775	7.1	808	16.9
14	407	406	1.00	0.0690	0.0015	1.2344	0.0256	0.1294	0.0009	898	44.4	785	5.2	816	11.6
15	122	124	0.99	0.0693	0.0020	1.2824	0.0348	0.1343	0.0013	907	55.4	812	7.4	838	15.5
16	384	469	0.82	0.0703	0.0012	1.3545	0.0248	0.1392	0.0011	939	36.0	840	6.1	869	10.7
17	37.8	32.8	1.15	0.0724	0.0065	1.3231	0.1118	0.1352	0.0041	998	183	818	23.4	856	48.9
18	243	206	1.18	0.0686	0.0029	1.2481	0.0522	0.1312	0.0019	887	87.5	794	11.0	823	23.6
19	42.8	122	0.35	0.0670	0.0061	1.2171	0.1342	0.1329	0.0041	839	192	804	23.1	808	61.5
20	379	417	0.91	0.0685	0.0022	1.2560	0.0420	0.1320	0.0018	883	68.5	799	10.2	826	18.9
21	65.9	67.6	0.97	0.0688	0.0056	1.2685	0.0963	0.1346	0.0037	892	166	814	21.0	832	43.1
22	121	121	1.00	0.0764	0.0058	1.4271	0.1220	0.1299	0.0032	1106	154	787	18.3	900	51.0
23	180	130	1.38	0.0653	0.0034	1.2320	0.0630	0.1361	0.0027	787	114	823	15.1	815	28.7
24	127	103	1.23	0.0794	0.0082	1.4330	0.1290	0.1291	0.0041	1181	205	783	23.6	903	53.8
PM038-15-4
1	92.7	151	0.61	0.0592	0.0048	0.5891	0.0443	0.0719	0.0018	572	178	448	10.9	470	28.3
2	69.5	125	0.56	0.0829	0.0055	0.8940	0.0541	0.0783	0.0015	1266	129	486	9.1	649	29.0
3	49.4	115	0.43	0.0524	0.0046	0.3393	0.0272	0.0472	0.0011	302	200	297	6.6	297	20.6
4	216	267	0.81	0.0592	0.0029	0.5715	0.0268	0.0703	0.0012	576	107	438	7.3	459	17.3
5	178	356	0.50	0.0543	0.0051	0.3213	0.0270	0.0435	0.0015	383	211	274	9.0	283	20.8
6	75.4	90.7	0.83	0.0686	0.0052	1.2702	0.0941	0.1352	0.0034	887	157	817	19.0	832	42.1
7	4651	1523	3.05	0.7620	0.0747	4.5737	0.2740	0.0564	0.0028			354	16.8	1744	49.9
8	57.8	108	0.54	0.1057	0.0068	1.1082	0.0727	0.0761	0.0017	1728	117	473	10.2	757	35.0
9	234	447	0.52	0.0659	0.0044	0.4020	0.0254	0.0446	0.0011	1200	171	281	6.7	343	18.4
10	130	867	0.15	0.0600	0.0020	0.6980	0.0230	0.0834	0.0012	611	73.0	517	7.1	538	13.8
11	118	244	0.48	0.0553	0.0043	0.3271	0.0253	0.0426	0.0011	433	172	269	6.9	287	19.4
12	134	143	0.94	0.0464	0.0074	0.1508	0.0214	0.0231	0.0011	20.5	341	147	7.1	143	18.8
13	58.6	129	0.45	0.0548	0.0046	0.3354	0.0244	0.0462	0.0012	467	189	291	7.1	294	18.6
14	181	394	0.46	0.0516	0.0026	0.3344	0.0162	0.0463	0.0007	333	119	291	4.6	293	12.4
15	131	260	0.50	0.0504	0.0029	0.3194	0.0173	0.0454	0.0009	213	131	286	5.3	281	13.3
16	69.0	130	0.53	0.0570	0.0045	0.5764	0.0454	0.0725	0.0019	500	174	451	11.7	462	29.2
PM038-15-4
17	192	233	0.82	0.0569	0.0029	0.5721	0.0268	0.0717	0.0013	500	112.9	446	7.5	459	17.3
18	188	245	0.77	0.0543	0.0023	0.5450	0.0236	0.0714	0.0012	389	96.3	444	7.4	442	15.5
19	286	312	0.92	0.0482	0.0041	0.1242	0.0098	0.0188	0.0005	109	189	120	2.9	119	8.9
20	122	235	0.52	0.0647	0.0058	0.3895	0.0307	0.0436	0.0011	765	189	275	7.1	334	22.4
21	98.0	166	0.59	0.0778	0.0038	2.2857	0.0991	0.2098	0.0038	1143	96.3	1228	20.2	1208	30.6
22	74.2	129	0.58	0.0563	0.0037	0.5981	0.0366	0.0762	0.0019	465	142	473	11.2	476	23.3
23	58.8	143	0.41	0.0527	0.0042	0.3533	0.0249	0.0494	0.0011	322	183	311	6.8	307	18.7
24	38.7	87.1	0.44	0.0563	0.0047	0.4810	0.0356	0.0622	0.0018	465	153	389	11.2	399	24.4
25	47.2	96.3	0.49	0.0555	0.0051	0.3673	0.0312	0.0481	0.0013	435	206	303	7.9	318	23.2
26	46.8	108	0.43	0.0565	0.0082	0.3554	0.0387	0.0494	0.0017	472	321	311	10.2	309	29.0
GH1612-1-1
1	227	504	0.45	0.0484	0.0017	0.2413	0.0082	0.0363	0.0004	117	83.3	230	2.4	219	6.7
2	210	444	0.47	0.0518	0.0020	0.2571	0.0095	0.0362	0.0004	276	88.9	229	2.2	232	7.7
3	255	606	0.42	0.0492	0.0017	0.2445	0.0083	0.0361	0.0003	167	81.5	228	2.0	222	6.8
4	223	543	0.41	0.0491	0.0020	0.2477	0.0098	0.0367	0.0004	150	94.4	232	2.3	225	8
5	249	362	0.69	0.0470	0.0022	0.2317	0.0105	0.0360	0.0004	50	116.7	228	2.6	212	8.6
6	215	447	0.48	0.0548	0.0032	0.2739	0.0153	0.0365	0.0007	406	99.1	231	4.4	246	12.2
7	335	568	0.59	0.0518	0.0016	0.2594	0.0079	0.0365	0.0004	276	67.6	231	2.4	234	6.4
8	254	502	0.51	0.0494	0.0020	0.2465	0.0098	0.0362	0.0004	165	98.1	229	2.5	224	8
9	134	354	0.38	0.0485	0.0020	0.2409	0.0102	0.0361	0.0004	124	98.1	229	2.8	219	8.3
10	116	251	0.46	0.0472	0.0030	0.2237	0.0133	0.0347	0.0005	58	153.7	220	3.1	205	11
11	103	447	0.23	0.0649	0.0030	0.8928	0.0257	0.0993	0.0013	772	97.1	610	7.7	648	13.8
12	206	472	0.44	0.0564	0.0027	0.2858	0.0137	0.0367	0.0004	478	100.9	232	2.3	255	10.8
13	212	577	0.37	0.0535	0.0021	0.2666	0.0100	0.0361	0.0004	350	87.0	229	2.6	240	8
14	113	432	0.26	0.0501	0.0024	0.2495	0.0125	0.0361	0.0007	198	111.1	228	4.4	226	10.2
15	242	460	0.53	0.0564	0.0027	0.2817	0.0133	0.0361	0.0004	478	100.9	229	2.6	252	10.5
16	206	382	0.54	0.0508	0.0020	0.2561	0.0108	0.0365	0.0006	232	88.9	231	3.8	232	8.7
17	324	636	0.51	0.0472	0.0016	0.2390	0.0081	0.0366	0.0004	58	142.6	232	2.4	218	6.7
18	252	566	0.45	0.0586	0.0024	0.2996	0.0119	0.0370	0.0005	550	90.7	234	3.0	266	9.3
19	283	499	0.57	0.0553	0.0024	0.2771	0.0124	0.0361	0.0004	433	98.1	228	2.5	248	9.9
20	218	358	0.61	0.0543	0.0038	0.2646	0.0185	0.0353	0.0005	383	157.4	224	3.3	238	14.8
21	268	454	0.59	0.0581	0.0023	0.3416	0.0145	0.0425	0.0009	600	80.5	268	5.4	298	10.9
22	150	382	0.39	0.0482	0.0026	0.2434	0.0132	0.0366	0.0006	109	125.9	232	3.9	221	10.8
23	152	389	0.39	0.1618	0.0032	4.5886	0.1102	0.2048	0.0034	2476	32.3	1201	18.1	1747	20.1
24	150	341	0.44	0.0521	0.0022	0.2625	0.0122	0.0363	0.0006	287	98.1	230	3.6	237	9.8
25	103	483	0.21	0.0548	0.0036	0.2683	0.0167	0.0356	0.0005	406	146.3	226	3.3	241	13.4
26	182	435	0.42	0.0609	0.0034	0.3020	0.0113	0.0360	0.0004	639	114.6	228	2.5	268	8.8
27	219	450	0.49	0.0545	0.0022	0.2711	0.0109	0.0360	0.0005	394	88.9	228	3.3	244	8.7
28	266	479	0.56	0.0523	0.0022	0.2581	0.0101	0.0358	0.0004	298	89.8	227	2.5	233	8.2
29	190	389	0.49	0.0518	0.0022	0.2604	0.0107	0.0363	0.0005	276	96.3	230	3.0	235	8.6
30	227	515	0.44	0.0531	0.0020	0.2662	0.0094	0.0363	0.0004	345	80.5	230	2.3	240	7.5

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①	云南省地质调查院.云南1: 5万香竹林、勐勇、勐撒、懂过、安雅、耿马、勐库幅区域地质矿产调查报告. 2016.
②	云南省地质调查院.云南1: 25万临沧县、滚龙幅(国内部分)区域地质调查报告. 2003.
③	成都地质调查中心.云南1: 5万双江县、大芒光房、文东幅区域地质调查阶段性成果报告. 2016—2018.
④	云南省地质矿产勘查院.云南1: 5万下景张、新营盘、城子、东岗幅区域地质调查阶段性成果报告. 2017—2018.
⑤	云南省地质调查院.云南1: 5万曼谷、小街、大勐龙、曼班、万纳兰、勐宋坝幅区域地质调查阶段性成果报告. 2017—2018.

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滇西勐库地区退变质榴辉岩锆石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. 自然资源部三江成矿作用及资源勘查利用重点实验室, 云南 昆明 650061 3. 云南省地质环境监测院, 云南 昆明 650216

作者简介: 孙载波(1981-), 男, 硕士, 高级工程师, 从事区域地质调查与研究工作。E-mail:ynddyszb@163.com

通讯作者: 李静(1964-), 男, 硕士, 教授级高工, 从事区域地质调查及技术管理工作。E-mail:lijing641229@163.com

Zircon U-Pb age and geological significance of retrograded eclogites from Mengku area in western Yunnan Province

Corresponding author: LI Jing, lijing641229@163.com

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1.
云南省地质调查院, 云南昆明 650216

2.
自然资源部三江成矿作用及资源勘查利用重点实验室, 云南昆明 650061

3.
云南省地质环境监测院, 云南昆明 650216