新疆库地南苏盖提力克晚志留世花岗岩锆石U-Pb年龄、地球化学特征及大地构造意义

专少鹏; 白春东; 毛志芳; 李典; 张新征; 陈圆圆; 连青

doi:10.12090/j.issn.1006-6616.2018.24.05.066

新疆库地南苏盖提力克晚志留世花岗岩锆石U-Pb年龄、地球化学特征及大地构造意义

doi: 10.12090/j.issn.1006-6616.2018.24.05.066

河北省区域地质调查院, 河北廊坊 065000

基金项目:

新疆维吾尔自治区地质勘查基金项目 XJDKJJZ2011-4

详细信息

作者简介:
专少鹏(1979-), 男, 硕士, 副高级工程师, 主要从事区域地质矿产调查与研究工作。E-mail:825801653@qq.com

中图分类号: P588.12
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- 被引次数: 0
出版历程
- 收稿日期: 2018-04-12
- 修回日期: 2018-07-30
- 刊出日期: 2018-10-01

ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE

Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China

摘要

摘要: 西昆仑地区早古生代原特提斯洋的后碰撞阶段划分存在分歧，通过对库地蛇绿岩南侧苏盖提力克花岗岩开展区域地质调查、岩石学、地球化学、锆石U-Pb年代学等方面研究，从而为原特提斯洋构造演化及闭合时限提供地质依据。研究表明，苏盖提力克花岗岩锆石U-Pb年龄（LA-ICP-MS）为（422.5±2.5）Ma，属于晚志留世岩浆活动产物。苏盖提力克花岗岩含有典型矿物白云母，A/CNK=1.07~1.11，刚玉分子含量为1.07%~1.56%，属于S型花岗岩。地球化学上，该岩体富硅、碱，贫钙、镁，富K、Rb、Nb、Th，贫Sr、Ti、P，Rb/Sr比值高；结合区域地质背景及地球化学特征综合分析表明，苏盖提力克花岗岩是原特提斯洋闭合后碰撞阶段的产物，因而晚志留世是原特提斯洋由消减闭合到陆陆碰撞—碰撞后伸展转换时期。
- 西昆仑 /
- 原特提斯洋 /
- 锆石U-Pb年龄 /
- 晚志留世 /
- S型花岗岩
Abstract: There are different opinions about the division of post-collisional stages of the Early Paleozoic Proto-Tethys Ocean in the West Kunlun area. In this paper, researches including regional geological survey, petrology, geochemistry, zircon U-Pb chronology, etc. were carried out on Sugaitilike granites, south side of Kudi ophiolite, which provide a geological basis for the tectonic evolution and closing time limit of the Proto-Tethys Ocean. The results show that, the age of zircon U-Pb(LA-ICP-MS) is 422.5±2.5 Ma, making granites products of the late Silurian magma activities. Sugaitilike granite contains typical mineral muscovite, A/CNK=1.07~1.11, and the content of corundum is 1.07~1.56%, belonging to S-type granite. Geochemically, the rock body is rich in silicon, alkali, calcium-depleted, magnesium-rich, rich in K, Rb, Nb, Th, lean in Sr, Ti, P, and high in Rb/Sr ratio. The comprehensive analysis of the geological background and geochemical characteristics of the Sugeitik granite area shows that granites are the products of the collision phase of the Proto-Tethys Ocean. Therefore, the late Silurian is the transition period from the closing of the Proto-Tethys Ocean to the collision of land and land-the period of post-collisional extension transformation.
- west Kunlun area /
- Proto-Tethys Ocean /
- zircon U-Pb age /
- Late Silurian granite /
- S-type granite

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图 1 库地地区的地质简图^[11]

Figure 1. Simplified geological map of Kudi area^[11]

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图 2 苏盖提力克花岗岩野外和显微结构照片

Kf—钾长石；Pl—斜长石；Bi—黑云母；Q—石英a—野外露头；b—显微结构

Figure 2. Field and microstructure photographs of Sugaitilike granite

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图 3 中细粒二长花岗岩U-Pb定年测试锆石阴极发光图像

Figure 3. Zircon CL images of middle-fine grained monzonite granite

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图 4 中细粒二长花岗岩锆石LA-ICP-MS U-Pb年龄谐和曲线图

Figure 4. Zircon U-Pb concordia diagram of middle-fine grained monzonite granite

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图 5 SiO₂-A.R图解^[15]

Figure 5. SiO₂-A.R diagram^[15]

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图 6 SiO₂-K₂O图解^[16]

Figure 6. SiO₂-K₂O diagram^[16]

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图 7 球粒陨石标准化REE模式图^[17]

Figure 7. Chondrite normalized REE pattern^[17]

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图 8 微量元素原始地幔标准化蛛网图^[18]

Figure 8. Primitive mantle normalized diagram of trace elements^[18]

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图 9 Rb/Sr-Rb/Ba图解^[23]

Figure 9. Rb/Sr-Rb/Ba diagram^[23]

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表 1 二长花岗岩LA-ICP-MS锆石U-Pb分析结果

Table 1. LA-ICP-MS zircon U-Pb data of monzonite granite

样品号	含量/×10^-6		同位素比值										年龄/Ma
P1TW1	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
P1TW1.1	18	247	0.0686	0.0005	0.5196	0.0096	0.0549	0.0010	0.0211	0.0002	0.6024	0.0032	427	3	425	8	410	39
P1TW1.2	90	1380	0.0694	0.0004	0.5285	0.0044	0.0553	0.0004	0.0204	0.0002	0.0922	0.0007	432	2	431	4	423	17
P1TW1.3	15	204	0.0691	0.0004	0.5201	0.0110	0.0546	0.0011	0.0192	0.0001	0.7381	0.0025	431	3	425	9	395	46
P1TW1.4	42	631	0.0687	0.0004	0.5205	0.0049	0.0550	0.0005	0.0198	0.0001	0.2140	0.0012	428	3	425	4	411	20
P1TW1.5	23	321	0.0686	0.0004	0.5360	0.0068	0.0566	0.0007	0.0197	0.0001	0.5574	0.0022	428	3	436	6	477	26
P1TW1.6	21	274	0.0687	0.0004	0.5333	0.0075	0.0563	0.0008	0.0199	0.0001	0.7047	0.0062	428	3	434	6	464	30
P1TW1.7	23	340	0.0682	0.0005	0.5264	0.0070	0.0560	0.0007	0.0201	0.0001	0.3738	0.0055	425	3	429	6	452	27
P1TW1.8	38	313	0.1244	0.0008	1.1077	0.0103	0.0646	0.0005	0.0385	0.0003	0.1954	0.0016	756	5	757	7	761	18
P1TW1.9	9	136	0.0633	0.0006	0.4739	0.0245	0.0542	0.0027	0.0219	0.0005	0.5397	0.0022	396	4	394	20	379	114
P1TW1.10	24	342	0.0671	0.0005	0.5157	0.0074	0.0557	0.0007	0.0224	0.0001	0.4178	0.0019	419	3	422	6	439	29
P1TW1.11	19	276	0.0666	0.0004	0.5077	0.0094	0.0553	0.0010	0.0232	0.0002	0.4425	0.0016	416	3	417	8	424	39
P1TW1.12	43	357	0.1230	0.0009	1.0890	0.0104	0.0642	0.0005	0.0393	0.0002	0.2244	0.0029	748	5	748	7	748	18
P1TW1.13	43	576	0.0676	0.0005	0.5270	0.0052	0.0566	0.0005	0.0199	0.0001	0.7179	0.0040	421	3	430	4	475	20
P1TW1.14	34	402	0.0664	0.0004	0.5257	0.0062	0.0574	0.0006	0.0206	0.0002	1.2851	0.1485	414	2	429	5	508	25
P1TW1.15	35	481	0.0670	0.0005	0.5238	0.0058	0.0567	0.0006	0.0195	0.0001	0.7089	0.0039	418	3	428	5	482	23
P1TW1.16	40	570	0.0669	0.0005	0.5219	0.0051	0.0566	0.0005	0.0199	0.0001	0.5597	0.0052	417	3	426	4	476	20
P1TW1.17	26	326	0.0670	0.0004	0.5514	0.0084	0.0596	0.0009	0.0202	0.0001	1.0436	0.0036	418	3	446	7	590	31
P1TW1.18	22	270	0.0681	0.0005	0.5311	0.0076	0.0566	0.0008	0.0216	0.0001	0.9443	0.0093	425	3	433	6	474	30
P1TW1.19	24	340	0.0676	0.0004	0.5281	0.0076	0.0567	0.0008	0.0211	0.0001	0.4940	0.0028	422	3	431	6	478	30
P1TW1.20	16	215	0.0675	0.0004	0.5278	0.0101	0.0567	0.0011	0.0196	0.0001	0.8569	0.0048	421	3	430	8	481	41
P1TW1.21	13	357	0.0351	0.0002	0.2554	0.0061	0.0528	0.0012	0.0115	0.0001	0.4664	0.0062	222	1	231	5	321	53
P1TW1.22	29	416	0.0672	0.0004	0.5150	0.0063	0.0556	0.0006	0.0225	0.0001	0.3992	0.0214	419	2	422	5	437	26
P1TW1.23	29	388	0.0671	0.0004	0.5312	0.0072	0.0575	0.0007	0.0208	0.0002	0.6723	0.0297	418	2	433	6	509	29
P1TW1.24	13	184	0.0670	0.0005	0.5380	0.0106	0.0583	0.0011	0.0196	0.0002	0.5327	0.0020	418	3	437	9	540	43
P1TW1.25	31	437	0.0683	0.0004	0.5208	0.0070	0.0553	0.0007	0.0190	0.0002	0.5053	0.0065	426	2	426	6	425	29

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表 2 苏盖提力克花岗岩主量元素(%)和微量元素(×10^-6)及相关参数

Table 2. Major elements (%) and trace elements (%) in sugaitlike granites and related parameters

样号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Los	La	Ce	Pr	Nd	Sm	Eu
P1YQ1	74.14	0.21	13.91	0.29	0.91	0.04	0.27	1.26	3.3	4.87	0.055	0.67	48.17	92.74	10.23	34.05	5.82	0.76
P1YQ2	73.53	0.25	14.08	0.84	0.57	0.028	0.23	1.29	3.22	4.86	0.085	0.93	63.76	118.7	13.12	43.92	7.64	0.86
P1YQ3	74.97	0.11	13.89	0.41	0.41	0.021	0.15	0.89	2.89	5.59	0.046	0.59	38.47	70.86	7.88	27.07	5.67	0.59
P1YQ4	73.61	0.19	14.09	0.32	1.08	0.035	0.35	1.35	3.18	4.74	0.069	0.9	48.23	91.21	9.95	33.12	6.08	0.7
P1YQ5	74.37	0.19	13.6	0.45	0.84	0.032	0.25	1.07	2.86	5.21	0.069	0.95	52.03	98.09	10.72	36.21	6.61	0.7
P1YQ6	72.53	0.3	14.23	0.49	1.34	0.038	0.48	1.73	3	4.82	0.08	0.85	65.54	122.4	12.67	41.38	6.56	0.93

样号	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	Rb	Sr	Ba	Ga	Nb	Ta	Zr	Hf	Th
P1YQ1	4.96	0.84	4.72	0.9	2.52	0.46	3.02	0.35	24.87	300.8	79.9	502.3	17.17	37.81	5.38	140.9	3.98	27.06
P1YQ2	6.2	0.91	4.25	0.73	1.95	0.3	2.38	0.28	20.21	313.8	63.2	472.7	20.15	46.07	4.85	183.8	5.16	21.61
P1YQ3	5.06	1.01	6.18	1.26	3.53	0.66	3.87	0.46	39.28	317.5	60.1	278.4	16.26	29.61	3.78	94.9	2.87	19.58
P1YQ4	5.01	0.82	4.32	0.82	2.23	0.38	2.22	0.29	24.72	240	98.1	658.9	17.75	28.87	3.9	130.5	3.26	26.6
P1YQ5	5.32	0.83	4.2	0.76	2.02	0.34	2.06	0.24	22.6	302.3	50.3	361.1	18.39	37.2	5.43	121.9	2.86	20.32
P1YQ6	5.47	0.77	4.02	0.78	2.13	0.36	2.04	0.23	22.69	268.2	135.1	1618	17.54	35.46	3.38	184.9	5.21	26.67

样号	V	Cr	Sc	U	AR	K₂O/Na₂O	A/CNK	C	Mg^#	∑REE	(La/Yb)_N	δEu	(La/Sm)_N	(Gd/Yb)_N	(Ho/Yb)_N	Rb/Sr	Rb/Ba	Y/Yb
P1YQ1	8.9	3.5	3.86	2.68	2.54	1.48	1.07	1.07	29	209.53	10.77	0.42	5.2	1.33	0.87	3.77	0.6	8.24
P1YQ2	14.7	4.9	3.4	4.94	2.44	1.51	1.09	1.39	25	265.04	18.07	0.37	5.25	2.1	0.9	4.97	0.66	8.5
P1YQ3	4.4	4.4	2.76	5	2.28	1.93	1.11	1.56	25	172.56	6.7	0.33	4.27	1.05	0.95	5.29	1.14	10.15
P1YQ4	11.7	5.3	3.47	2.02	2.4	1.49	1.1	1.42	32	205.37	14.64	0.38	4.99	1.82	1.07	2.45	0.36	11.12
P1YQ5	8.2	4.7	2.96	3.66	2.28	1.82	1.11	1.46	25	220.13	17.02	0.35	4.95	2.08	1.07	6.01	0.84	10.96
P1YQ6	20.3	5	3.77	2.39	2.2	1.61	1.08	1.1	32	265.27	21.66	0.46	6.29	2.16	1.12	1.99	0.17	11.12

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