北祁连牛心山似斑状正长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义

张越; 李向民; 潘峰; 宋忠宝

北祁连牛心山似斑状正长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义

中国地质调查局西安地质调查中心, 陕西西安 710054

基金项目:

中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》 DD20160012

详细信息

作者简介:
张越(1985-), 男, 硕士, 工程师, 从事岩石地球化学研究。E-mail:413027602@qq.com

中图分类号: P588.12⁺1;P597⁺.3
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出版历程
- 收稿日期: 2017-07-06
- 修回日期: 2018-03-12
- 网络出版日期: 2023-08-15
- 刊出日期: 2018-03-31

LA-ICP-MS zircon U-Pb dating of the porphyaceous syenogranite in Niuxinshan along the central segment of North Qilian orogenic belt and its geological significance

Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, Shaanxi, China

摘要

摘要:
青海省祁连县西出露一个似斑状正长花岗岩体，运用LA-ICP-MS方法，对似斑状正长花岗岩中的锆石进行U-Pb同位素分析。测年结果显示，似斑状正长花岗岩的形成年龄为166.6±2.4Ma，表明其形成于燕山期中侏罗世，继承锆石显示前寒武纪源区的时代信息。岩石地球化学特征表明，似斑状正长花岗岩具有高硅、富碱特点，属于过铝质高钾钙碱性岩，具弱负Eu异常，富集Rb、Th、K，亏损Ba、Nb、P、Ti，Rb/Sr值平均为1.86，反映出壳源特点，为S型花岗岩。
- 北祁连造山带 /
- 花岗岩 /
- 地球化学特征 /
- LA-ICP-MS锆石U-Pb测年
Abstract:
The porphyaceous syenogranite pluton is exposed in the west of Qilian Country, Qinghai Province. The authors conduct-ed LA-ICP-MS zircon U-Pb dating of the porphyaceous syenogranite and the result shows that the age is 166.6±2.4Ma, suggesting the Middle Jurassic of Yanshanian period. Several inheritable magmatic zircons yielded the age information of the Precambrian peri-od. Geochemical data show that the porphyaceous syenogranite is silica-enriched in composition with high content of alkali, and hence it is a peraluminous granite and belongs to the high-K calc-alkaline series. It is characterized by enrichment of Rb, Th, K, de-pletion of Ba, Nb, P, Ti, and weak negative anomaly of Eu, with the average Rb/Sr ratio being 1.86, which reflects the characteris-tics of the crust source and indicates S type granite.
- North Qilian orogenic belt /
- granite /
- geochemical characteristics /
- LA-ICP-MS zircon U-Pb dating

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致谢: 感谢甘肃四堪院张野工程师及中国地质大学（北京）博士生邵华胜对野外工作的帮助，审稿专家对文章提出了诸多宝贵意见，在此表示感谢。

图 1 北祁连牛心山一带地质图

Figure 1. Geological map of Niuxinshan, North Qilian

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图 2 花岗岩样品野外和镜下显微特征

Qtz—石英；Tur—电气石；Kfs—钾长石；Grt—石榴子石

Figure 2. Photos of rocks and microphotographs of granites

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图 3 锆石阴极发光（CL）图像

Figure 3. Cathodoluminescence (CL) images of zircons

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图 4 锆石U-Pb谐和图和年龄频谱图

Figure 4. Zircon U-Pb concordia diagram and age spectra

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图 5 锆石U-Pb谐和图及²⁰⁶Pb/²³⁸U年龄

Figure 5. Zircon U-Pb concordia diagram and weighted average diagram

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图 6 锆石U-Pb谐和图及²⁰⁶Pb/²³⁸U年龄

Figure 6. Zircon U-Pb concordia diagram and weighted average diagram

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图 7 锆石Th-U之间的相关性

Figure 7. Diagram of relativity between Th and U in zircons

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图 8 花岗岩A/CNK-A/NK^[33]和SiO₂-K₂O图解^[34]

Figure 8. A/CNK-A/NK and SiO₂-K₂O diagrams of the granites

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图 9 花岗岩SiO₂-Fe^*（a）和SiO₂-MALI图解（b）^[35-36]

Figure 9. SiO₂-Fe^*(a) and SiO₂-MALI(b) diagrams of the granites

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图 10 稀土元素球粒陨石配分模式图^[37]（a）及微量元素原始地幔标准化蛛网图^[37]（b）

Figure 10. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b)

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表 1 LA-ICP-MS锆石U-Th-Pb定年结果

Table 1 Results of zircon LA-ICP-MS U-Th-Pb dating

样点编号	含量/10^-6				同位素比值									年龄/Ma
样点编号	²³⁸U	²³²Th	²⁰⁶Pb	²⁰⁷Pb	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	300.53	135.79	173.85	13.22	0.0688	0.0017	1.2402	0.0296	0.1308	0.0015	0.0449	0.0008	0.4518	892	31	819	13	792	8	887	15
2	384.63	280.91	44.58	2.5	0.0508	0.0027	0.1837	0.0094	0.0262	0.0004	0.0088	0.0002	0.7303	231	92	171	8	167	2	178	4
3	228.4	75.93	131.38	9.51	0.0655	0.0023	1.1779	0.0398	0.1304	0.0017	0.0365	0.0011	0.3324	791	49	790	19	790	10	725	21
4	697.09	29.79	765.67	77.78	0.0921	0.0023	3.1631	0.0761	0.2492	0.0030	0.0616	0.0043	0.0427	1469	28	1448	19	1434	15	1209	81
5	387.47	122.34	219.75	15.72	0.0649	0.0018	1.1518	0.0307	0.1288	0.0015	0.0403	0.0009	0.3157	770	37	778	14	781	8	798	17
6	430.83	265.38	49.21	2.91	0.0536	0.0027	0.1920	0.0096	0.0260	0.0004	0.0084	0.0002	0.6160	356	86	178	8	165	2	169	4
7	227.47	166.8	26.47	1.49	0.0513	0.0036	0.1874	0.0129	0.0265	0.0005	0.0081	0.0003	0.7333	253	125	174	11	169	3	162	5
8	484.55	287.34	56.76	2.99	0.0480	0.0024	0.1767	0.0087	0.0267	0.0004	0.0087	0.0002	0.5930	97	84	165	7	170	2	175	4
9	461.8	373.97	53.92	2.97	0.0501	0.0031	0.1843	0.0111	0.0267	0.0004	0.0087	0.0002	0.8098	201	108	172	10	170	3	174	5
10	504.2	279.14	58.35	4.55	0.0710	0.0031	0.2590	0.0109	0.0265	0.0004	0.0113	0.0003	0.5536	8	139	154	9	163	2	164	5
11	349.02	223.98	39.74	2.47	0.0565	0.0036	0.2030	0.0125	0.0261	0.0004	0.0092	0.0003	0.6417	45	168	156	11	164	3	165	4
13	371.47	237.93	42.3	2.38	0.0515	0.0032	0.1861	0.0111	0.0262	0.0004	0.0095	0.0003	0.6405	264	108	173	10	167	3	191	5
14	359.5	245.05	41.09	2.29	0.0509	0.0045	0.1846	0.0158	0.0263	0.0006	0.0084	0.0004	0.6816	234	155	172	14	168	3	170	7
15	258.16	100.14	145.86	10.84	0.0680	0.0023	1.2214	0.0391	0.1303	0.0016	0.0440	0.0011	0.3879	868	46	810	18	789	9	870	21
16	320.47	180.03	36.47	2.12	0.0533	0.0035	0.1930	0.0123	0.0263	0.0005	0.0101	0.0003	0.5618	342	114	179	11	167	3	204	7
17	319.24	98.01	35.86	2.07	0.0528	0.0044	0.1891	0.0152	0.0260	0.0005	0.0098	0.0005	0.3070	322	146	176	13	165	3	196	11
19	149.97	65.74	85.13	6.05	0.0653	0.0025	1.1845	0.0446	0.1316	0.0018	0.0386	0.0011	0.4384	783	56	793	21	797	10	766	22
20	216.3	66.39	121.36	9.05	0.0685	0.0041	1.2294	0.0721	0.1302	0.0024	0.0530	0.0024	0.3069	883	91	814	33	789	14	1044	45
23	304.44	87.81	362.98	39.51	0.1002	0.0033	3.8348	0.1233	0.2776	0.0040	0.0915	0.0031	0.2884	1628	39	1600	26	1579	20	1770	58
24	756.36	392.66	423.72	32.34	0.0703	0.0017	1.2655	0.0300	0.1306	0.0014	0.0508	0.0008	0.5191	937	31	830	13	791	8	1001	16

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表 2 花岗岩主量、微量和稀土元素分析结果

Table 2 Major, trace and rare earth elements compositions of the granites

样品号	BG01-1	BG01-2	BG01-3	BG01-4	BG01-5	BG01-6	BG01-7	BG01-8
SiO₂	74.42	74.15	74.22	72.42	74.13	75.98	73.93	74.85
TiO₂	0.07	0.12	0.07	0.10	0.06	0.08	0.04	0.07
Al₂O₃	13.95	13.87	14.24	14.23	14.13	13.47	14.08	13.77
Fe₂O₃	0.20	0.19	0.19	0.32	0.21	0.25	0.23	0.19
FeO	0.40	0.64	0.31	0.56	0.31	0.39	0.48	0.44
MnO	0.01	0.02	0.01	0.02	0.02	0.02	0.05	0.01
MgO	0.36	0.35	0.27	0.61	0.23	0.39	0.27	0.33
CaO	1.34	0.91	1.28	1.16	1.17	1.27	1.60	1.29
Na₂O	3.79	4.58	3.90	3.64	4.06	4.78	3.77	4.20
K₂O	4.86	4.39	4.93	5.77	4.92	2.73	4.76	4.11
P₂O₅	0.06	0.05	0.06	0.07	0.05	0.05	0.07	0.05
H₂O⁺	0.14	0.26	0.20	0.18	0.10	0.18	0.14	0.10
烧失量	0.50	0.68	0.45	1.07	0.66	0.55	0.68	0.65
总计	100.11	100.21	100.14	100.15	100.05	100.14	100.10	100.06
全碱	8.65	8.97	8.83	9.41	8.98	7.51	8.53	8.31
Mg^#	0.53	0.44	0.50	0.56	0.45	0.53	0.41	0.49
FeO^*	0.58	0.82	0.48	0.86	0.50	0.62	0.69	0.62
Fe^*	0.47	0.56	0.50	0.44	0.55	0.47	0.59	0.51
MALI	7.35	8.12	7.59	8.34	7.87	6.28	6.98	7.07
A/NK	1.21	1.13	1.21	1.16	1.18	1.24	1.24	1.21
A/CNK	1.00	0.99	1.01	0.99	1.00	1.03	0.99	1.00
Cu	4.73	7.05	5.74	6.07	6.03	5.20	5.65	4.13
Pb	30.50	22.50	28.50	36.30	30.40	20.00	30.10	27.50
Zn	6.23	6.45	5.18	10.30	4.99	6.99	< 4.4	7.86
Cr	27.80	9.49	8.01	17.30	10.80	18.40	22.20	13.90
Ni	5.17	3.68	3.65	9.97	3.11	5.30	3.32	4.21
Co	1.65	1.72	1.17	2.73	0.98	1.59	1.11	1.50
Li	4.88	5.26	4.54	6.45	4.24	5.91	4.48	5.76
Rb	181.00	175.00	171.00	215.00	185.00	104.00	170.00	152.00
Cs	5.22	3.35	4.68	6.00	5.33	3.38	5.76	4.71
Sr	96.60	90.20	86.20	94.40	87.70	93.30	86.50	94.80
Ba	267.00	268.00	157.00	207.00	210.00	163.00	160.00	208.00
V	13.30	13.00	12.60	15.80	10.40	14.80	10.30	13.20
Nb	8.55	7.73	7.80	9.04	6.83	6.60	5.59	7.69
Ta	1.40	0.94	1.18	1.43	1.03	1.10	1.07	1.23
Zr	39.10	27.10	37.30	62.20	52.70	32.10	63.00	42.90
Hf	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Be	6.37	3.64	6.15	4.99	7.02	6.98	7.93	6.98
Ga	15.90	15.80	17.30	16.00	16.30	14.90	18.00	15.80
Ge	1.93	1.23	2.02	1.96	1.93	1.27	2.33	1.71
U	3.73	2.08	2.72	3.75	4.09	2.58	4.80	3.89
Th	2.91	3.36	2.81	3.06	2.78	2.24	5.38	2.43
La	9.20	9.67	6.97	8.44	7.88	7.53	11.40	7.89
Ce	18.50	20.60	14.00	16.50	16.10	15.00	23.30	16.00
Pr	2.46	2.66	1.81	2.14	2.09	1.92	3.12	2.07
Nd	9.32	9.63	6.71	8.09	7.84	7.05	11.60	7.59
Sm	2.78	2.57	2.01	2.54	2.36	2.08	3.40	2.34
Eu	0.75	0.72	0.53	0.66	0.74	0.66	0.57	0.73
Gd	3.67	3.02	2.48	3.76	3.03	2.84	4.04	3.23
Tb	0.93	0.68	0.62	1.07	0.78	0.73	1.01	0.85
Dy	6.48	4.43	4.18	7.40	5.59	5.08	7.04	6.48
Ho	1.37	0.92	0.86	1.66	1.14	1.07	1.54	1.30
Er	3.70	2.41	2.39	4.54	3.21	2.92	4.48	3.49
Tm	0.57	0.38	0.39	0.71	0.51	0.47	0.79	0.56
Yb	3.42	2.28	2.45	4.44	3.07	2.71	5.08	3.34
Lu	0.49	0.31	0.35	0.64	0.45	0.39	0.77	0.49
Y	38.70	25.30	24.70	50.50	33.40	30.80	43.80	36.40
∑REE	63.64	60.28	45.75	62.59	54.79	50.45	78.14	56.36
LREE/HREE	2.08	3.18	2.33	1.58	2.08	2.11	2.16	1.86
(La/Yb)_N	1.83	2.88	1.93	1.29	1.74	1.89	1.52	1.60
(La/Sm)_N	2.07	2.35	2.17	2.08	2.09	2.26	2.09	2.11
(Gd/Yb)_N	0.87	1.07	0.82	0.69	0.80	0.85	0.64	0.78
δEu	0.72	0.79	0.72	0.65	0.84	0.83	0.47	0.81
Nb/La	0.93	0.80	1.12	1.07	0.87	0.88	0.49	0.97
Hf/Ta	0.71	1.06	0.85	0.70	0.97	0.91	0.93	0.81
Zr/Nb	4.57	3.51	4.78	6.88	7.72	4.86	11.27	5.58
Ta/Yb	0.41	0.41	0.48	0.32	0.34	0.41	0.21	0.37
Th/Ta	2.08	3.57	2.38	2.14	2.70	2.04	5.03	1.98
La/Ta	6.57	10.29	5.91	5.90	7.65	6.85	10.65	6.41
注：主量元素含量单位为%，微量和稀土元素含量为10^-6

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