晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义

王建其; 刘祥; 第五春荣

晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义

大陆动力学国家重点实验室, 西北大学地质学系, 陕西西安 710069

基金项目:
国家自然科学基金项目《国家创新研究群体:大陆构造与动力学》（批准号：41421002）、《华北克拉通南缘早前寒武纪构造-热事件及其地质意义》（批准号：41672188）、《华北克拉通南缘豫陕地区古元古代构造-热事件研究》（批准号：41272004）

详细信息

作者简介: 王建其 (1960-), 男, 工程师, 从事地球化学分析和研究。E-mail:wangjianqi@nwu.edu.cn

中图分类号: P597⁺.3

收稿日期: 2016-11-18

修回日期: 2017-01-17

刊出日期: 2017-03-25

LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, Chin

Received Date: 18 November 2016

Revised Date: 17 January 2017

Publish Date: 25 March 2017

摘要

摘要:
涑水杂岩作为华北克拉通南部早前寒武纪变质基底杂岩的重要组成部分，以中条山地区出露最好且研究程度最高。在晋陕交界处的韩城和河津地区也有零星的古老变质基底杂岩出露，通常认为是中条山地区涑水杂岩的西延。用LA-ICP-MS锆石U-Pb方法测得研究区内的基底岩石角闪斜长片麻岩、透辉斜长片麻岩和二长花岗片麻岩原岩的形成年龄分别为2260±28Ma、2053±34Ma和2098±27Ma，表明晋陕交界处涑水杂岩的形成年龄明显小于中条山地区的涑水杂岩，其形成时代主要应为古元古代早期，而非太古宙。锆石Hf同位素显示，所分析的锆石多数具有低ε_Hf(t) 值，最低可达-6，其二阶段模式年龄为2630~2933Ma，表明这些形成于古元古代的岩石为太古宙岩石再循环的产物，暗示在晋陕交界处可能存在太古宙的古老地壳物质，同时也支持华北克拉通南部太古宙地块划分的推论。
- 华北克拉通 /
- 涑水杂岩 /
- 基底岩石 /
- LA-ICP-MS锆石U-Pb年龄 /
- Hf同位素
Abstract:
The Sushui complex is one of the main component parts of basement rocks in southern North China Craton (NCC). It is typically exposed in Zhongtiaoshan area and has been studied in detail. The Early Precambrian metamorphic basement complex rocks sporadically exposed in Shanxi-Shaanxi border area are traditionally regarded as the western extension and equivalents of Sushui complex in Zhongtiao region. LA-ICP-MS zircon U-Pb dating reveals that the protolithic ages of amphibolite-plagioclase gneiss, diopside-plagioclase gneiss and two-feldspar granite gneiss are 2260 ± 28Ma, 2053 ± 34Ma and 2098 ± 27Ma, respectively, significantly younger than the ages of rocks in Zhongtiaoshan area, suggesting that the Sushui complex was likely formed in Early Paleoproterozoic rather than in Archean. The majority of zircons of the samples have negative ε_Hf(t) values (the lowerest being-6) with two-stage crustal model ages of 2630~2933Ma, which suggests that these samples were derived from recycled Mesoarchean to Neoarchean crust, and continental crustal materials as old as 2630~2933Ma probably preexisted in the Shanxi-Shaanxi border area. These results provide further evidence for the inference that the southern NCC was likely a coherent ancient terrane at the end of the Neoarchean.
- North China Craton /
- Sushui complex /
- basement rocks /
- LA-ICP-MS zircon U-Pb ages /
- Hf isotope

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图 1 华北克拉通前寒武纪地质简图^[4](a) 和中条山地区地质简图 (b)^[5]

Figure 1.

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图 2 晋陕交界区地质简图

Figure 2.

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图 3 晋陕交界涑水杂岩的锆石U-Pb年龄和Hf同位素组成

Figure 3.

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图图版Ⅰ a.河津市西磑口样品；b.韩城市阳山庄角闪斜长片麻岩；c.角闪斜长片麻岩；d.透辉斜长片麻岩；e.二长花片麻岩.Pl—斜长石；Mic—微斜长石；Di—透辉石；Amp—角闪石；Qz—石英；Mt—磁铁矿

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表 1 晋陕交界涑水杂岩锆石U-Th-Pb年龄

Table 1. Zircon U-Th-Pb dating of the Sushui complex in Shanxi-Shaanxi border area

样品号	含量/10^-6			Th/U	同位素比值						年龄/Ma
样品号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
角闪斜长片麻岩 (12YSZ03)
12YSZ03-01	133	233	299	0.78	0.1397	0.0045	7.405	0.135	0.3847	0.0063	2223	54	2162	16	2098	29
12YSZ03-02	128	210	304	0.69	0.1416	0.0045	7.095	0.129	0.3637	0.0060	2247	54	2123	16	2000	28
12YSZ03-03	86	132	195	0.68	0.1435	0.0047	7.506	0.142	0.3797	0.0063	2269	55	2174	17	2075	29
12YSZ03-04	147	326	340	0.96	0.1421	0.0045	7.311	0.128	0.3732	0.0061	2253	54	2150	16	2045	28
12YSZ03-05	86	93	188	0.50	0.1439	0.0047	7.760	0.148	0.3913	0.0065	2275	55	2204	17	2129	30
12YSZ03-06	97	125	205	0.61	0.1433	0.0046	8.022	0.151	0.4062	0.0067	2268	55	2234	17	2197	31
12YSZ03-07	136	234	314	0.75	0.1403	0.0045	7.209	0.132	0.3729	0.0061	2231	54	2138	16	2043	29
12YSZ03-08	95	151	206	0.74	0.1402	0.0046	7.695	0.150	0.3984	0.0067	2229	56	2196	18	2162	31
12YSZ03-09	114	202	261	0.77	0.1395	0.0045	7.232	0.135	0.3763	0.0062	2220	55	2141	17	2059	29
12YSZ03-10	110	231	253	0.91	0.1401	0.0045	7.264	0.134	0.3761	0.0062	2229	55	2144	16	2058	29
12YSZ03-11	83	81	186	0.44	0.1414	0.0046	7.518	0.144	0.3859	0.0064	2244	55	2175	17	2104	30
12YSZ03-12	140	249	329	0.76	0.1395	0.0045	7.087	0.130	0.3688	0.0060	2221	55	2123	16	2024	28
12YSZ03-13	92	137	213	0.64	0.1403	0.0046	7.169	0.138	0.3707	0.0062	2231	56	2133	17	2033	29
12YSZ03-14	99	125	202	0.62	0.1439	0.0047	8.371	0.162	0.4221	0.0070	2275	55	2272	18	2270	32
12YSZ03-15	92	73	197	0.37	0.1392	0.0053	7.746	0.211	0.4038	0.0076	2217	65	2202	25	2187	35
12YSZ03-16	131	227	286	0.80	0.1403	0.0045	7.658	0.141	0.3960	0.0065	2231	55	2192	17	2151	30
12YSZ03-17	139	265	306	0.87	0.1428	0.0048	7.725	0.161	0.3925	0.0067	2262	57	2200	19	2134	31
12YSZ03-18	107	118	238	0.50	0.1404	0.0046	7.539	0.142	0.3895	0.0064	2233	55	2178	17	2121	30
12YSZ03-19	131	221	285	0.78	0.1403	0.0049	7.665	0.172	0.3964	0.0069	2231	59	2193	20	2152	32
12YSZ03-20	111	133	257	0.52	0.1422	0.0046	7.295	0.133	0.3723	0.0061	2254	54	2148	16	2040	29
透辉斜长片麻岩 (12YSZ031)
12YSZ031-01	104	259	432	0.60	0.1272	0.0049	3.652	0.103	0.2083	0.0039	2060	66	1561	22	1220	21
12YSZ031-02	95	403	408	0.99	0.1330	0.0050	3.755	0.100	0.2047	0.0038	2138	64	1583	21	1200	20
12YSZ031-03	94	270	373	0.72	0.1310	0.0044	3.933	0.086	0.2178	0.0038	2111	58	1620	18	1270	20
12YSZ031-04	95	248	379	0.65	0.1335	0.0049	4.007	0.104	0.2176	0.0040	2145	63	1636	21	1269	21
12YSZ031-05	104	471	423	1.11	0.1344	0.0047	4.012	0.093	0.2163	0.0038	2156	59	1637	19	1263	20
12YSZ031-06	97	225	376	0.60	0.1326	0.0056	4.067	0.134	0.2225	0.0045	2133	72	1648	27	1295	24
12YSZ031-07	96	394	364	1.08	0.1316	0.0051	4.160	0.119	0.2293	0.0044	2119	66	1666	23	1331	23
12YSZ031-08	106	266	371	0.72	0.1291	0.0051	4.349	0.130	0.2444	0.0047	2086	68	1703	25	1410	24
12YSZ031-09	98	226	358	0.63	0.1321	0.0042	4.372	0.084	0.2399	0.0041	2126	55	1707	16	1386	21
12YSZ031-10	54	78	187	0.41	0.1286	0.0071	4.488	0.214	0.2530	0.0063	2079	94	1729	40	1454	32
12YSZ031-11	112	79	386	0.20	0.1300	0.0041	4.588	0.087	0.2558	0.0043	2098	55	1747	16	1468	22
12YSZ031-12	98	252	328	0.77	0.1278	0.0043	4.602	0.100	0.2612	0.0045	2067	58	1750	18	1496	23
12YSZ031-13	82	154	265	0.58	0.1311	0.0043	4.881	0.098	0.2701	0.0046	2112	56	1799	17	1541	23
12YSZ031-14	85	202	257	0.79	0.1266	0.0044	5.011	0.118	0.2870	0.0051	2052	60	1821	20	1627	25
12YSZ031-15	103	207	294	0.70	0.1283	0.0046	5.336	0.132	0.3016	0.0055	2075	62	1875	21	1699	27
12YSZ031-16	89	70	251	0.28	0.1269	0.0041	5.393	0.105	0.3083	0.0052	2055	56	1884	17	1732	26
12YSZ031-17	76	107	200	0.54	0.1306	0.0047	6.070	0.154	0.3367	0.0062	2107	62	1986	22	1871	30

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表 2 晋陕交界涑水杂岩锆石Hf同位素组成

Table 2. Zircon Hf isotopic compositions of the Sushui complex in Shanxi-Shaanxi border area

样品号	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	(¹⁷⁶Hf/¹⁷⁷Hf)₀	(¹⁷⁶Hf/¹⁷⁷Hf)_i	2σ	εHf (t)	2σ	T_DM1	T_DM2(CC)	T_{DM2(CC_2014)}	f_Lu/Hf
角闪斜长片麻岩(12YSZ03)
12YSZ03-01	2260	0.043486	0.001403	0.281450	0.281389	0.000010	1.9	0.3	2545	2709	2648	-0.96
12YSZ03-02	2260	0.026787	0.000923	0.281402	0.281362	0.000013	0.9	0.5	2578	2768	2700	-0.97
12YSZ03-03	2260	0.070682	0.002234	0.281411	0.281315	0.000013	-0.8	0.5	2657	2871	2789	-0.93
12YSZ03-05	2260	0.021740	0.000804	0.281432	0.281398	0.000019	2.2	0.7	2529	2690	2632	-0.98
12YSZ03-06	2260	0.046220	0.001520	0.281452	0.281387	0.000015	1.8	0.5	2549	2714	2654	-0.95
12YSZ03-07	2260	0.019108	0.000645	0.281372	0.281344	0.000010	0.2	0.4	2600	2807	2734	-0.98
12YSZ03-08	2260	0.054515	0.001778	0.281421	0.281344	0.000014	0.3	0.5	2611	2807	2734	-0.95
12YSZ03-09	2260	0.039883	0.001260	0.281414	0.281360	0.000014	0.8	0.5	2585	2773	2704	-0.96
12YSZ03-11	2260	0.103130	0.003122	0.281435	0.281300	0.000016	-1.3	0.6	2688	2903	2816	-0.91
12YSZ03-12	2260	0.015796	0.000542	0.281387	0.281363	0.000017	0.9	0.6	2574	2765	2697	-0.98
12YSZ03-14	2260	0.046732	0.001466	0.281372	0.281309	0.000021	-1.0	0.8	2657	2884	2800	-0.96
12YSZ03-15	2260	0.051977	0.001629	0.281432	0.281362	0.000012	0.9	0.4	2585	2768	2700	-0.95
12YSZ03-16	2260	0.050081	0.001567	0.281417	0.281349	0.000013	0.4	0.5	2601	2795	2723	-0.95
12YSZ03-17	2260	0.042134	0.001347	0.281401	0.281343	0.000016	0.2	0.6	2608	2809	2735	-0.96
12YSZ03-18	2260	0.051399	0.001622	0.281402	0.281332	0.000015	-0.2	0.5	2626	2833	2756	-0.95
12YSZ03-20	2260	0.038482	0.001219	0.281425	0.281372	0.000011	1.2	0.4	2567	2746	2681	-0.96
透辉斜长片麻岩 (12YSZ031)
12YSZ031-01	2053	0.024452	0.000861	0.281505	0.281472	0.000013	0.0	0.5	2433	2661	2579	-0.97
12YSZ031-02	2053	0.040618	0.001427	0.281492	0.281436	0.000021	-1.3	0.7	2488	2738	2646	-0.96
12YSZ031-04	2053	0.027679	0.000941	0.281520	0.281483	0.000014	0.4	0.5	2418	2636	2558	-0.97
12YSZ031-05	2053	0.032882	0.001127	0.281486	0.281442	0.000018	-1.1	0.6	2477	2725	2635	-0.97
12YSZ031-07	2053	0.033591	0.001111	0.281519	0.281475	0.000014	0.1	0.5	2431	2653	2572	-0.97
12YSZ031-08	2053	0.033288	0.001114	0.281475	0.281432	0.000023	-1.4	0.8	2490	2747	2654	-0.97
12YSZ031-09	2053	0.034142	0.001181	0.281528	0.281482	0.000026	0.4	0.9	2422	2638	2559	-0.96
12YSZ031-10	2053	0.032118	0.001058	0.281483	0.281442	0.000019	-1.1	0.7	2476	2725	2635	-0.97
12YSZ031-11	2053	0.023981	0.000759	0.281487	0.281457	0.000027	-0.5	0.9	2452	2692	2606	-0.98
12YSZ031-12	2053	0.059430	0.001923	0.281543	0.281468	0.000018	-0.1	0.6	2449	2668	2586	-0.94
12YSZ031-13	2053	0.050933	0.001590	0.281517	0.281455	0.000016	-0.6	0.6	2464	2697	2611	-0.95
12YSZ031-14	2053	0.015522	0.000548	0.281519	0.281498	0.000010	0.9	0.4	2395	2603	2529	-0.98
12YSZ031-16	2053	0.047364	0.001547	0.281555	0.281494	0.000011	0.8	0.4	2409	2611	2536	-0.95
12YSZ031-17	2053	0.014949	0.000507	0.281501	0.281481	0.000008	0.3	0.3	2417	2640	2561	-0.98
二长花岗片麻岩 (12XWK03)
12XWK03-01	2098	0.041136	0.001278	0.281353	0.281302	0.000020	-5.0	0.7	2669	3000	2879	-0.96
12XWK03-02	2098	0.072607	0.002298	0.281365	0.281274	0.000051	-6.0	1.8	2726	3063	2933	-0.93
12XWK03-03	2098	0.059392	0.001697	0.281394	0.281326	0.000025	-4.1	0.9	2642	2948	2834	-0.95
12XWK03-04	2098	0.062262	0.001884	0.281386	0.281311	0.000020	-4.7	0.7	2667	2982	2864	-0.94
12XWK03-06	2098	0.048828	0.001484	0.281346	0.281287	0.000019	-5.5	0.7	2693	3033	2908	-0.96
12XWK03-07	2098	0.043049	0.001330	0.281395	0.281342	0.000019	-3.6	0.7	2615	2915	2805	-0.96
12XWK03-08	2098	0.051850	0.001573	0.281423	0.281360	0.000017	-2.9	0.6	2593	2874	2770	-0.95
12XWK03-09	2098	0.065822	0.001815	0.281376	0.281303	0.000024	-5.0	0.9	2676	2999	2878	-0.95
12XWK03-11	2098	0.022580	0.000708	0.281324	0.281296	0.000017	-5.2	0.6	2669	3015	2892	-0.98
12XWK03-12	2098	0.037852	0.001223	0.281403	0.281354	0.000014	-3.2	0.5	2597	2888	2782	-0.96

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晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义

大陆动力学国家重点实验室, 西北大学地质学系, 陕西 西安 710069

作者简介: 王建其 (1960-), 男, 工程师, 从事地球化学分析和研究。E-mail:wangjianqi@nwu.edu.cn

LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui complex in Shanxi-Shaanxi border area and their geological significance

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, Chin

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大陆动力学国家重点实验室, 西北大学地质学系, 陕西西安 710069