宗务隆构造带东段宗务隆群碎屑锆石年代学及其构造意义

赵文涛; 王雁鹤; 李健; 王根厚; 钱荣毅; 李鹏胜

doi:10.12401/j.nwg.2025079

宗务隆构造带东段宗务隆群碎屑锆石年代学及其构造意义

1.
青海大学地质工程学院，青海西宁　810016

2.
中国地质调查局西宁自然资源综合调查中心，青海西宁　810012

3.
青海省第一地质勘查院，青海海东　810600

4.
中国地质大学（北京）地球科学与资源学院，北京　100083

5.
中国地质大学（北京）地球物理与信息技术学院，北京　100083

基金项目: 青海省“昆仑英才·高端创新创业人才”项目（2023），中国地质调查局项目“祁连成矿带金矿资源潜力动态评价”（DD20220979）联合资助。

详细信息

作者简介: 赵文涛（1982−），男，讲师，主要从事构造地质学方面的研究工作。E−mail：10078369@qq.com

通讯作者: 王雁鹤（1983−），男，高级工程师，主要从事基础地质调查和矿产勘查工作。E−mail：wyhxnzx@163.com。

中图分类号: P597；P542

收稿日期: 2025-04-01

修回日期: 2025-05-20

录用日期: 2025-05-20

刊出日期: 2025-10-20

Detrital Zircon Geochronology of the Zongwulong Group in the Eastern Segment of the Zongwulong Tectonic Belt and Its Tectonic Significance

1.
School of Geological Engineering, Qinghai University, Xining 810016, Qinghai, China

2.
Xining Center of Natural Resources Comprehensive Survey, China Geological Survey, Xining 810012, Qinghai, China

3.
The First Geological Exploration Institute of Qinghai Province, Haidong 810600, Qinghai, China

4.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China

5.
School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, China

More Information

Corresponding author: WANG Yanhe, wyhxnzx@163.com

Received Date: 01 April 2025

Revised Date: 20 May 2025

Accepted Date: 20 May 2025

Publish Date: 20 October 2025

摘要

摘要:
位于青藏高原东北缘的宗务隆构造带，夹持于南祁连、柴达木北缘和西秦岭构造带之间，其形成、演化与特提斯构造域密切相关。目前，对于宗务隆群的形成时代、物质来源及构造演化仍有较多争议。笔者以该构造带东段的宗务隆群碎屑岩为研究对象，分析其碎屑锆石U-Pb同位素年龄、微量元素特征及Hf同位素组成。研究结果显示，宗务隆群的沉积时代不早于中二叠世，碎屑锆石U-Pb年龄主要集中在早古生代和晚古生代，峰值分别为～431 Ma和～269 Ma。微量元素特征碎屑锆石来源于与弧相关的大陆地壳锆石，与南侧乌兰−青海南山一带的岩浆活动可以对应；年龄谱的分析表明：宗务隆构造带东西段的构造演化具有不同的历程，东段发育有限洋盆且可能是古特提斯洋最北部的分支，西段则无相关洋盆发育。
- 宗务隆群 /
- 碎屑锆石 /
- Hf同位素 /
- 宗务隆构造带
Abstract:
The Zongwulong tectonic belt is situated at the northeastern margin of the Tibetan Plateau, constrained between the South Qilian, North Qaidam margin, and West Qinling tectonic belts. Its tectonic evolution is closely associated with the northeastern Tethyan tectonic domain. Current academic debates persist regarding the formation age of the Zongwulong Group, its material provenance, and the evolutionary history of the tectonic belt. This study focuses on the clastic rocks of the Zongwulong Group in the eastern segment of the tectonic belt, employing detrital zircon U-Pb geochronology, trace element analysis, and Hf isotopic composition investigations. Results demonstrate that the depositional age of the Zongwulong Group postdates the Middle Permian. Detrital zircon U-Pb ages predominantly cluster in the Early Paleozoic and Late Paleozoic, with prominent peaks at ～431 Ma and ～269 Ma. Trace element characteristics indicate that these detrital zircons originated from arc-related continental crustal sources, correlating with magmatic activities in the southern Wulan-Qinghai Nanshan region. Comparative analysis of age spectra reveals distinct tectonic evolutionary processes between the eastern and western segments of the Zongwulong belt. The eastern segment developed a limited oceanic basin, potentially representing the northernmost branch of the Paleo-Tethys Ocean, whereas the western segment shows no evidence of oceanic basin development.
- Zongwulong Group /
- detrital zircon /
- Hf isotope /
- Zongwulong tectonic belt

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图 1 研究区地质简图（A据Wu et al., 2020修改）

Figure 1.

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图 2 样品野外露头（a）及正交偏光显微特征（b）

Figure 2.

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图 3 宗务隆群代表性碎屑锆石CL图像（a）及年龄分布图（b）

Figure 3.

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图 4 宗务隆群碎屑岩碎屑锆石εHf（t）-U-Pb年龄图（a）和二阶段Hf模式年龄图（b）

Figure 4.

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图 5 碎屑锆石微量元素判别图解（a～e）（底图据 Grimes et al., 2007; Yang et al., 2012）和碎屑锆石年龄（结晶年龄与推测沉积年龄之差）累积概率图（f）（底图据 Cawood et al., 2012）

Figure 5.

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图 6 碎屑锆石U-Pb年龄标准化相对概率图

Figure 6.

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图 7 宗务隆构造带泥盆纪—三叠纪演化示意图

Figure 7.

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表 1 宗务隆群碎屑岩锆石 U-Pb 年龄分析结果

Table 1. LA-ICP-MS zircon U-Pb dating results for the Zongwulong Group clastic rocks

测点	含量（10^–6）		Th/U	同位素比值						年龄（Ma）
测点	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	583	825	0.71	0.0567	0.0014	0.5345	0.0126	0.0681	0.0005	435	8.3	425	3.3	424	7.8
2	707	739	0.96	0.0579	0.0014	0.5796	0.0140	0.0723	0.0006	464	9.0	450	3.7	475	8.0
3	320	285	1.12	0.0520	0.0018	0.3855	0.0135	0.0536	0.0004	331	9.9	337	2.7	349	6.2
4	233	379	0.61	0.0605	0.0017	0.5892	0.0173	0.0701	0.0007	470	11.1	437	4.4	459	9.8
5	47.5	101	0.47	0.0576	0.0032	0.3155	0.0168	0.0397	0.0006	278	13.0	251	3.4	260	9.6
6	146	306	0.48	0.0489	0.0017	0.2851	0.0100	0.0422	0.0004	255	7.9	266	2.5	264	7.0
7	159	278	0.57	0.0542	0.0015	0.5499	0.0148	0.0734	0.0006	445	9.7	457	3.6	454	8.5
8	369	559	0.66	0.0541	0.0014	0.4422	0.0102	0.0593	0.0005	372	7.2	371	3.1	375	6.7
9	191	329	0.58	0.0504	0.0129	0.6343	0.1369	0.0677	0.0015	499	85.1	423	9.0	634	101.7
10	216	385	0.56	0.0540	0.0015	0.5189	0.0136	0.0696	0.0005	424	9.1	434	3.2	442	7.7
11	101	115	0.88	0.0543	0.0031	0.3390	0.0190	0.0453	0.0007	296	14.4	286	4.1	297	8.4
12	205	365	0.56	0.0543	0.0015	0.5138	0.0137	0.0688	0.0006	421	9.2	429	3.6	432	8.5
13	552	949	0.58	0.0540	0.0011	0.4684	0.0101	0.0628	0.0007	390	7.0	393	4.1	403	7.5
14	226	367	0.62	0.0510	0.0017	0.2951	0.0097	0.0420	0.0004	263	7.6	265	2.3	274	5.7
15	389	422	0.92	0.0558	0.0013	0.5607	0.0135	0.0728	0.0007	452	8.8	453	3.9	459	8.2
16	155	153	1.02	0.0524	0.0024	0.3752	0.0168	0.0522	0.0006	323	12.4	328	3.8	332	6.3
17	187	331	0.56	0.0552	0.0017	0.5313	0.0152	0.0700	0.0007	433	10.1	436	4.0	448	8.7
18	54.8	115	0.48	0.0860	0.0020	2.7727	0.0620	0.2336	0.0021	1348	16.7	1353	10.9	1395	27.4
19	223	418	0.53	0.0533	0.0014	0.5148	0.0130	0.0700	0.0006	422	8.7	436	3.7	431	8.8
20	91.5	380	0.24	0.0530	0.0014	0.4935	0.0131	0.0674	0.0005	407	8.9	421	3.2	403	8.7
21	166	312	0.53	0.0537	0.0018	0.3173	0.0105	0.0429	0.0004	280	8.1	271	2.5	264	6.3
22	179	272	0.66	0.0546	0.0018	0.5267	0.0169	0.0698	0.0007	430	11.2	435	4.1	463	8.4
23	244	463	0.53	0.0503	0.0014	0.2848	0.0078	0.0410	0.0003	254	6.2	259	2.1	278	5.7
24	91.3	171	0.53	0.0572	0.0021	0.5493	0.0197	0.0701	0.0008	445	12.9	437	5.0	438	11.1
25	298	536	0.56	0.0554	0.0014	0.5592	0.0139	0.0733	0.0007	451	9.1	456	3.9	476	9.3
26	141	132	1.06	0.0512	0.0022	0.4679	0.0193	0.0671	0.0007	390	13.3	418	4.3	423	8.8
27	132	299	0.44	0.1690	0.0026	10.6665	0.1713	0.4568	0.0030	2495	15.0	2426	13.5	2477	33.9
28	117	180	0.65	0.0567	0.0021	0.5937	0.0215	0.0758	0.0007	473	13.7	471	4.2	456	9.6
29	151	258	0.59	0.0579	0.0017	0.5410	0.0158	0.0675	0.0005	439	10.4	421	3.3	423	8.5
30	122	125	0.98	0.0795	0.0019	2.0623	0.0471	0.1879	0.0014	1136	15.6	1110	7.5	1113	18.3
31	105	166	0.63	0.0559	0.0024	0.3378	0.0141	0.0439	0.0005	295	10.7	277	2.8	278	7.5
32	161	303	0.53	0.0561	0.0015	0.5352	0.0141	0.0690	0.0005	435	9.3	430	3.0	439	8.4
33	177	321	0.55	0.0549	0.0015	0.5321	0.0143	0.0702	0.0007	433	9.5	438	4.4	445	9.0
34	247	351	0.71	0.0543	0.0017	0.3189	0.0099	0.0425	0.0004	281	7.6	269	2.3	271	5.5
35	134	230	0.58	0.0689	0.0015	1.5316	0.0333	0.1608	0.0011	943	13.4	961	6.3	951	16.1
36	178	342	0.52	0.0537	0.0013	0.5106	0.0120	0.0688	0.0005	419	8.1	429	3.1	414	7.2
37	78.9	237	0.33	0.0708	0.0014	1.4903	0.0308	0.1520	0.0011	926	12.6	912	6.0	929	17.5
38	267	448	0.60	0.0535	0.0014	0.5001	0.0130	0.0674	0.0005	412	8.8	420	3.3	406	7.1
39	240	907	0.26	0.0654	0.0012	0.9864	0.0318	0.1078	0.0025	697	16.3	660	14.4	750	22.2
40	178	243	0.73	0.0509	0.0020	0.3006	0.0112	0.0429	0.0004	267	8.8	271	2.4	278	6.5
41	168	232	0.72	0.0550	0.0015	0.5254	0.0141	0.0692	0.0005	429	9.4	431	3.3	433	9.2
42	263	419	0.63	0.0554	0.0014	0.4419	0.0110	0.0578	0.0005	372	7.8	362	3.0	358	6.5
43	221	364	0.61	0.0593	0.0015	0.5349	0.0126	0.0655	0.0005	435	8.3	409	2.9	399	6.5
44	134	325	0.41	0.0550	0.0017	0.5206	0.0154	0.0687	0.0006	426	10.3	429	3.6	446	8.6
45	92.4	167	0.55	0.0589	0.0021	0.6108	0.0208	0.0755	0.0008	484	13.1	469	4.8	495	11.9
46	213	366	0.58	0.0554	0.0014	0.5787	0.0146	0.0756	0.0008	464	9.4	470	5.1	483	9.7
47	185	303	0.61	0.0542	0.0016	0.5326	0.0166	0.0710	0.0007	434	11.0	442	4.2	451	9.0
48	336	451	0.74	0.0554	0.0013	0.5326	0.0128	0.0697	0.0006	434	8.5	434	3.9	434	7.7
49	123	258	0.48	0.0594	0.0018	0.5692	0.0161	0.0696	0.0005	457	10.4	434	3.1	462	9.6
50	124	164	0.75	0.0549	0.0021	0.5242	0.0212	0.0690	0.0007	428	14.1	430	4.4	432	9.1
51	300	669	0.45	0.0603	0.0014	0.6194	0.0148	0.0742	0.0006	489	9.3	462	3.5	500	9.4
52	149	200	0.74	0.0558	0.0021	0.5224	0.0192	0.0680	0.0007	427	12.8	424	4.0	432	9.9
53	161	153	1.05	0.0537	0.0026	0.4084	0.0204	0.0552	0.0007	348	14.7	346	4.2	363	8.1
54	91.8	212	0.43	0.0604	0.0019	0.5441	0.0171	0.0652	0.0006	441	11.2	407	3.7	414	10.2
55	333	388	0.86	0.0552	0.0016	0.5150	0.0149	0.0673	0.0005	422	10.0	420	3.1	423	7.7
56	273	358	0.76	0.0567	0.0015	0.5197	0.0140	0.0661	0.0006	425	9.4	413	3.5	414	7.4
57	221	249	0.89	0.0551	0.0019	0.5436	0.0190	0.0714	0.0009	441	12.5	444	5.4	476	10.4
58	88.1	124	0.71	0.0674	0.0020	1.3713	0.0392	0.1477	0.0015	877	16.8	888	8.3	934	19.8
59	89.7	170	0.53	0.0542	0.0027	0.3108	0.0151	0.0418	0.0005	275	11.7	264	3.2	271	7.9
60	143	278	0.52	0.0548	0.0016	0.5058	0.0148	0.0670	0.0006	416	10.0	418	3.7	425	8.0
61	183	252	0.72	0.0532	0.0018	0.3539	0.0118	0.0483	0.0005	308	8.9	304	3.2	324	7.2
62	484	597	0.81	0.0556	0.0013	0.5755	0.0157	0.0748	0.0009	462	10.1	465	5.4	482	10.4
63	187	434	0.43	0.0549	0.0014	0.5194	0.0135	0.0687	0.0006	425	9.0	428	3.5	419	9.0
64	124	474	0.26	0.0545	0.0015	0.5139	0.0145	0.0684	0.0007	421	9.7	426	4.4	446	10.5
65	195	285	0.68	0.0610	0.0021	0.6247	0.0216	0.0745	0.0006	493	13.5	463	3.8	495	9.6
66	297	457	0.65	0.0583	0.0015	0.5917	0.0139	0.0738	0.0005	472	8.9	459	3.1	464	8.1
67	77.7	122	0.64	0.0564	0.0023	0.5241	0.0220	0.0676	0.0008	428	14.7	422	5.1	431	11.3
68	170	316	0.54	0.0511	0.0021	0.3257	0.0135	0.0463	0.0005	286	10.3	292	3.3	319	8.1
69	261	325	0.80	0.0570	0.0019	0.5882	0.0198	0.0749	0.0008	470	12.7	466	5.0	498	11.3
70	274	381	0.72	0.0578	0.0016	0.5851	0.0166	0.0732	0.0007	468	10.6	455	4.1	470	9.1
71	190	295	0.64	0.0526	0.0022	0.3147	0.0127	0.0436	0.0005	278	9.8	275	2.9	286	7.5
72	134	163	0.82	0.1667	0.0026	11.1133	0.1719	0.4823	0.0034	2533	14.5	2537	15.0	2675	35.9
73	324	356	0.91	0.0524	0.0016	0.3419	0.0106	0.0474	0.0004	299	8.0	298	2.5	317	6.0
74	116	314	0.37	0.0576	0.0018	0.5919	0.0188	0.0745	0.0008	472	12.0	463	4.7	483	11.7
75	151	128	1.18	0.0558	0.0030	0.3398	0.0175	0.0446	0.0007	297	13.2	281	4.2	296	7.8
76	129	173	0.75	0.0584	0.0022	0.5344	0.0202	0.0663	0.0006	435	13.4	414	3.9	409	8.1
77	190	305	0.62	0.0507	0.0018	0.2902	0.0107	0.0414	0.0004	259	8.5	261	2.5	261	5.5
78	297	336	0.88	0.0557	0.0014	0.5148	0.0127	0.0670	0.0005	422	8.5	418	2.9	394	5.7
79	107	319	0.34	0.0542	0.0015	0.5120	0.0147	0.0684	0.0006	420	9.9	426	3.5	429	7.9
80	376	353	1.07	0.0550	0.0014	0.5106	0.0131	0.0673	0.0005	419	8.8	420	3.0	410	6.3
81	278	467	0.59	0.0551	0.0013	0.5123	0.0119	0.0673	0.0005	420	8.0	420	3.1	413	7.0
82	208	423	0.49	0.0540	0.0014	0.4932	0.0130	0.0661	0.0006	407	8.9	413	3.4	416	8.7
83	78.0	139	0.56	0.0538	0.0018	0.6192	0.0202	0.0838	0.0009	489	12.7	519	5.5	525	12.1
84	169	253	0.67	0.0627	0.0018	0.6382	0.0193	0.0736	0.0009	501	12.0	458	5.4	402	9.9
85	262	406	0.65	0.0561	0.0014	0.5541	0.0133	0.0716	0.0005	448	8.7	446	3.3	434	7.4

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表 2 隆务河组碎屑岩锆石 Hf 同位素数据

Table 2. Hf isotopic compositions of zircons from the Zongwulong Group clastic rocks

测点编号	年龄（Ma）	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	ε_Hf（t）	T_DM （Ma）	T_2DM （Ma）	f_Lu/Hf
3	337	0.001077	0.282082	0.038756	−17.3	1651	2418	−0.97
8	371	0.000877	0.282530	0.034287	−0.6	1018	1405	−0.97
11	286	0.001030	0.282600	0.038750	0.0	924	1302	−0.97
13	393	0.001237	0.282595	0.048839	2.1	936	1252	−0.96
14	265	0.000994	0.282736	0.036859	4.4	731	1008	−0.97
16	328	0.000819	0.282091	0.027015	−17.1	1627	2399	−0.98
18	1353	0.000775	0.282077	0.029185	4.8	1644	1820	−0.98
28	471	0.000690	0.282570	0.024947	3.0	957	1252	−0.98
37	912	0.001548	0.282185	0.062091	−1.5	1526	1876	−0.95
38	420	0.000649	0.282350	0.025601	−5.9	1262	1772	−0.98
40	271	0.000867	0.282519	0.031442	−3.2	1033	1489	−0.97
42	362	0.000844	0.282552	0.032949	0.0	987	1361	−0.97
53	346	0.000757	0.282167	0.025977	−14.0	1519	2221	−0.98
57	444	0.000680	0.282436	0.024568	−2.3	1143	1566	−0.98
61	304	0.001361	0.282768	0.051084	6.3	693	919	−0.96
68	292	0.001064	0.282653	0.033187	2.0	849	1178	−0.97
71	275	0.001033	0.282555	0.028714	−1.8	987	1407	−0.97
72	2537	0.000661	0.281330	0.026103	4.8	2658	2732	−0.98
73	298	0.000639	0.282556	0.022265	−1.2	976	1388	−0.98
77	261	0.001024	0.282650	0.038357	1.3	853	1203	−0.97
82	413	0.000508	0.282578	0.017893	2.1	942	1267	−0.98

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宗务隆构造带东段宗务隆群碎屑锆石年代学及其构造意义

作者简介: 赵文涛（1982−），男，讲师，主要从事构造地质学方面的研究工作。E−mail：10078369@qq.com

通讯作者: 王雁鹤（1983−），男，高级工程师，主要从事基础地质调查和矿产勘查工作。E−mail：wyhxnzx@163.com。

Detrital Zircon Geochronology of the Zongwulong Group in the Eastern Segment of the Zongwulong Tectonic Belt and Its Tectonic Significance

Corresponding author: WANG Yanhe, wyhxnzx@163.com

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