新疆北部可可托海地区伟晶岩脉LA–ICP–MS锆石U–Pb年龄、地球化学、Lu–Hf同位素特征及其地质意义

蔺新望; 王星; 张亚峰; 赵端昌; 赵江林; 刘坤

doi:10.12401/j.nwg.2023007

新疆北部可可托海地区伟晶岩脉LA–ICP–MS锆石U–Pb年龄、地球化学、Lu–Hf同位素特征及其地质意义

1.
陕西省矿产地质调查中心，陕西西安　710068

2.
陕西省地质调查院，陕西西安　710054

基金项目: 陕西省公益性地质调查项目“陕西省南秦岭成矿带佛坪隆起南缘茅坪地区基础地质调查”（202102），新疆地勘基金中心项目“新疆富蕴县阿拉一带1∶5万L45E003023等五幅区域地质调查”（A16-1-LQ01），中国地质调查局项目“阿尔泰成矿带喀纳斯和东准地区地质矿产调查”（DD20160006）联合资助。

详细信息

作者简介: 蔺新望（1972–），男，高级工程师，长期从事区域地质调查研究工作。E–mail：starcug@126.com

中图分类号: P597.3

收稿日期: 2022-04-07

修回日期: 2022-10-27

刊出日期: 2023-08-20

LA–ICP–MS Zircon U–Pb Isotopic Age, Geochemistry, Lu–Hf Isotopic Characteristics and Geological Significance of Pegmatite Vein, in Koktokay Area, Northern Xinjiang

1.
Shaanxi Mineral Resources and Geological Survey, Xi’an 710068, Shaanxi , China

2.
Shaanxi Institute of Geological Survey, Xi’an 710054, Shaanxi , China

Received Date: 07 April 2022

Revised Date: 27 October 2022

Publish Date: 20 August 2023

摘要

摘要:
为了全面研究阿拉尔岩体与可可托海地区伟晶岩脉群在成因上的关系，笔者系统分析阿拉尔岩体西部阿热散一带含绿柱石伟晶岩脉中锆石U–Pb同位素年龄、地球化学、Hf同位素特征。结果显示：伟晶岩脉锆石²⁰⁶Pb/²³⁸U加权平均年龄为（203.9±2.2）Ma，地球化学特征表现为高Si、低Ti、富Al、富碱，富集大离子亲石元素Rb、Th、U和稀土元素La、Ce、Nd、Sm，亏损Ba、Nb、Ta、Zr、Hf、Sr、P、Ti，属于典型的低Ba、Sr岩石，锆石同位素¹⁷⁶Hf/¹⁷⁷Hf值为0.282714～0.282749，ε_Hf(t)值为+2.56～+3.65，t_DM^C模式年龄为852～912 Ma，与阿拉尔岩体具有形成时代的一致性，地球化学特征的相关性，¹⁷⁶Hf/¹⁷⁷Hf值与ε_Hf(t)值的相似性，表明两者具有密切的成因关系。结合区域资料认为，中生代稀有金属矿化伟晶岩脉与阿拉尔岩体所代表的岩浆活动可能均起源于前寒武纪变质砂岩及变质泥岩等地壳物质部分熔融，并发生了显著地结晶分异作用。
- 伟晶岩脉 /
- Be矿化 /
- 锆石U–Pb年龄 /
- 地球化学 /
- Lu–Hf同位素 /
- 可可托海地区 /
- 新疆北部
Abstract:
In order to comprehensively study the genetic relationship between Aral Rock Mass and the Pegmatite Vein group in Koktokay area, this work systematically analyzed the Zircon U–Pb isotopic age, geochemistry and Hf isotopic characteristics of the Be bearing pegmatite vein in the Ahersan area of the western Aral Rock Mass. The results show that the Zircon²⁰⁶Pb^/238U weighted average age of the pegmatite vein is (203.9 ± 2.2) Ma. Its geochemical characteristics are high silicon, low titanium, rich aluminum, rich alkali, rich in large ion lithophile elements Rb, Th, U and rare earth elements La, Ce, Nd, Sm, and depleted in Ba, Nb, Ta, Zr, Hf, Sr, P, Ti. It belongs to typical low Ba, Sr rocks. The zircon isotope ¹⁷⁶Hf/¹⁷⁷Hf values range from 0.282714 to 0.282749, The range of ε_Hf(t) value is +2.56～+3.65, the age of t_DM^C model is 852～912 Ma. the similarity of Zircon U–Pb isotopic age, the correlation of geochemical characteristics, the similarity of ¹⁷⁶Hf/¹⁷⁷Hf and ε_Hf(t) values, indicates that they have a close genetic relationship. Based on the regional data, it is believed that the magmatic activities represented by the Mesozoic rare metal mineralized pegmatite vein and Aral Rock Mass are may originate from the partial melting of crustal materials such as Precambrian metasandstone and metamorphic mudstone, and significant crystallization differentiation occurred.
- pegmatite vein /
- Be mineralization /
- zircon U–Pb isotopic age /
- geochemistry /
- Lu–Hf isotope /
- Koktokay area /
- Northern Xinjiang

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图 1 阿尔泰造山带构造位置图（a）（据何国琦等，1990）和构造分区图（b）（据Windley et al.，2002）

Figure 1.

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图 2 阿拉尔地区地质简图

Figure 2.

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图 3 伟晶岩脉野外宏观照片

Figure 3.

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图 4 伟晶岩脉显微岩相照片

Figure 4.

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图 5 伟晶岩脉锆石阴极发光图像及年龄值

Figure 5.

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图 6 伟晶岩脉锆石U–Pb年龄谐和图（a）和加权平均图（b）

Figure 6.

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图 7 SiO₂–K₂O图（据Peccerillo et al.，1976）

Figure 7.

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图 8 A/CNK–A/NK图（据Rickwood，1989）

Figure 8.

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图 9 球粒陨石标准稀土配分图（标准化值据Taylor et al.，1985）

Figure 9.

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图 10 原始地幔标准化蛛网图（标准化值据Sun et al.，1989）

Figure 10.

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表 1 含绿柱石伟晶岩脉（DP01-4-3）锆石LA–ICP–MS U–Th–Pb同位素分析结果表

Table 1. Analysis result of LA–ICP–MS zircon U–Th–Pb of the beryl bearing pegmatite vein (DP01-4-3)

点号	含量			Th/U	同位素比值								年龄（Ma）								谐和度
	Pb*	Th	U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th
	（10⁻⁶）				比值	1σ	比值	1σ	比值	1σ			年龄	1σ	年龄	1σ	年龄	1σ	年龄	1σ
1	147.58	81.00	5177.08	0.02	0.04803	0.00134	0.21199	0.00605	0.03186	0.00055	0.00933	0.00089	102	67	195	5	202	3	188	18	96%
2	230.80	134.08	8150.14	0.02	0.04778	0.00133	0.20533	0.00534	0.03108	0.00046	0.01036	0.00091	87	67	190	4	197	3	208	18	96%
3	281.72	162.16	9703.23	0.02	0.05009	0.00166	0.22362	0.00724	0.03247	0.00069	0.01619	0.00128	198	78	205	6	206	4	325	25	99%
4	1607.21	1711.35	54382.46	0.03	0.05249	0.00427	0.21352	0.00703	0.03156	0.00102	0.00772	0.00044	306	187	197	6	200	6	155	9	98%
5	180.82	109.45	6092.36	0.02	0.05237	0.00153	0.23988	0.00940	0.03307	0.00095	0.02087	0.00145	302	67	218	8	210	6	417	29	96%
6	401.66	329.54	14053.46	0.02	0.05097	0.00165	0.22631	0.00941	0.03185	0.00068	0.01519	0.00136	239	81	207	8	202	4	305	27	97%
7	508.57	271.96	16891.52	0.02	0.05584	0.00157	0.24998	0.01209	0.03234	0.00125	0.04805	0.00316	456	58	227	10	205	8	949	61	90%
8	180.63	62.57	6148.72	0.01	0.04837	0.00126	0.22270	0.00867	0.03314	0.00081	0.01153	0.00106	117	61	204	7	210	5	232	21	97%
9	181.28	78.13	6152.34	0.01	0.04905	0.00150	0.22288	0.00767	0.03310	0.00079	0.01190	0.00117	150	72	204	6	210	5	239	23	97%
10	164.12	112.77	5558.50	0.02	0.04905	0.00177	0.21616	0.00830	0.03219	0.00112	0.02427	0.00175	150	83	199	7	204	7	485	35	97%
11	312.28	127.72	10286.26	0.01	0.04613	0.00131	0.20849	0.00734	0.03272	0.00072	0.01059	0.00094	400	−322	192	6	208	4	213	19	92%
12	202.09	85.53	6761.02	0.01	0.04914	0.00153	0.22550	0.00844	0.03336	0.00085	0.01907	0.00121	154	77	206	7	212	5	382	24	97%
13	210.77	136.64	6979.74	0.02	0.04862	0.00127	0.21935	0.00582	0.03305	0.00080	0.01248	0.00093	128	56	201	5	210	5	251	19	95%
14	177.49	228.27	5389.96	0.04	0.06680	0.00348	0.31175	0.02446	0.03390	0.00204	0.03823	0.00520	831	108	276	19	215	13	758	101	75%
15	105.18	224.50	2417.34	0.09	0.07867	0.00343	0.45212	0.02223	0.04205	0.00132	0.04878	0.00431	1165	86	379	16	266	8	963	83	64%
16	142.48	77.86	4704.98	0.02	0.05242	0.00516	0.23193	0.02287	0.03226	0.00161	0.01957	0.00422	302	231	212	19	205	10	392	84	96%
17	338.51	178.55	11435.53	0.02	0.04914	0.00153	0.21585	0.01020	0.03180	0.00097	0.01348	0.00094	154	77	198	9	202	6	271	19	98%
18	207.78	129.63	6852.78	0.02	0.04692	0.00201	0.21038	0.01142	0.03270	0.00130	0.01413	0.00112	56	91	194	10	207	8	284	22	93%
19	780.17	343.24	21577.30	0.02	0.04767	0.00141	0.25085	0.00808	0.03833	0.00085	0.01234	0.00082	83	70	227	7	242	5	248	16	93%
20	589.57	291.50	20100.95	0.01	0.04996	0.00118	0.21427	0.00605	0.03126	0.00064	0.01038	0.00077	195	28	197	5	198	4	209	15	99%
21	290.04	130.87	9612.80	0.01	0.04951	0.00163	0.21928	0.00887	0.03230	0.00101	0.01687	0.00207	172	78	201	7	205	6	338	41	98%
22	268.29	101.80	8934.03	0.01	0.04849	0.00173	0.21308	0.00963	0.03196	0.00099	0.01072	0.00128	124	85	196	8	203	6	215	26	96%
23	192.63	70.95	6418.38	0.01	0.05101	0.00161	0.22446	0.00852	0.03209	0.00091	0.00897	0.00103	243	77	206	7	204	6	181	21	99%
24	251.08	103.94	8437.39	0.01	0.04902	0.00157	0.21460	0.00852	0.03191	0.00095	0.00987	0.00096	150	74	197	7	203	6	199	19	97%
注：Pb*=0.241×²⁰⁶Pb+0.221×²⁰⁷Pb+0.524×²⁰⁸Pb。

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表 2 含绿柱石伟晶岩脉（DP01-4-3）主量元素（%）、稀土元素（10⁻⁶）和微量元素（10⁻⁶）分析结果表

Table 2. Major element (%), REE (10⁻⁶) and trace element (10⁻⁶) dataes of the beryl bearing pegmatite vein (DP01-4-3)

元素	TC03/H3	TC03/H10	TC03-1/H3	TC03-2/H3	TC05/H4	TC05-1/H2	TC05-1/H6
SiO₂	73.77	75.07	79.11	77.45	75.57	76.76	73.01
TiO₂	0.02	0.02	0.02	0.02	0.02	0.02	0.02
Al₂O₃	14.6	13.82	11.65	12.22	13.39	12.95	14.91
T Fe₂O₃	1.57	0.74	0.8	1.03	0.43	0.86	1.03
FeO	0.79	0.34	0.37	0.42	0.19	0.34	0.49
Fe₂O₃*	0.7	0.36	0.39	0.56	0.22	0.48	0.49
MnO	0.59	0.03	0.16	0.04	0.03	0.11	0.09
MgO	0.2	0.2	0.2	0.2	0.2	0.2	0.2
CaO	0.6	0.4	0.36	0.1	0.1	0.44	0.59
Na₂O	6.54	4.66	4.42	2.68	2.71	5.98	7.88
K₂O	1.48	4.7	2.77	5.61	7.53	2.28	2.29
P₂O₅	0.1	0.16	0.11	0.08	0.1	0.17	0.16
LOI	0.58	0.37	0.46	0.52	0.09	0.39	0.18
Total	99.97	100.13	100.02	99.9	100.15	100.12	100.31
A/CNK	1.09	1.03	1.07	1.15	1.05	0.99	0.9
A/NK	1.18	1.08	1.13	1.17	1.06	1.05	0.97
Mg#	20.05	34.87	33.13	27.78	47.96	31.54	27.78
SI	2.06	1.95	2.45	2.11	1.84	2.15	1.76
La	2.8	2.82	3.5	0.89	0.6	1.06	1.44

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续表2
元素	TC03/H3	TC03/H10	TC03-1/H3	TC03-2/H3	TC05/H4	TC05-1/H2	TC05-1/H6
Ce	5.16	5.13	6.64	1.3	1.26	2.45	2.94
Pr	0.6	0.63	0.76	0.19	0.12	0.26	0.31
Nd	2.14	2.2	2.51	0.72	0.43	0.92	1.19
Sm	0.47	0.56	0.64	0.18	0.082	0.3	0.33
Eu	0.059	0.061	0.053	0.061	0.074	0.064	0.12
Gd	0.44	0.49	0.42	0.15	0.075	0.3	0.32
Tb	0.13	0.12	0.096	0.027	0.015	0.086	0.068
Dy	1	0.62	0.49	0.13	0.074	0.41	0.35
Ho	0.25	0.11	0.098	0.026	0.013	0.071	0.055
Er	0.85	0.28	0.32	0.077	0.039	0.16	0.13
Tm	0.2	0.051	0.069	0.011	0.005	0.025	0.018
Yb	1.72	0.35	0.55	0.071	0.03	0.14	0.13
Lu	0.27	0.048	0.087	0.012	0.005	0.019	0.018
Y	9.45	4.26	3.68	0.92	0.48	2.85	2.04
Ti	119.9	119.9	119.9	119.9	119.9	119.9	119.9
K	12286.2	39017	22995.1	46571.3	62510.2	18927.4	19010.4
P	436	698	480	349	436	742	698
Sr	15.6	19.1	11	15.7	21.1	21.2	21.8
Ba	30.3	36	18	137	187	43.6	91.1
Cr	6.18	4.37	3.67	4.63	4.72	7.4	5.32
Co	0.76	0.54	0.49	0.65	0.44	0.81	0.73
Ni	2.89	2.33	1.7	2.13	1.91	2.05	3.29
Ga	27.2	20.2	20.5	26.2	17.5	22.4	20.7
Th	3.66	2.61	1.64	0.49	0.3	0.82	1.42
U	1.84	1.01	3.12	1.59	0.19	4.04	3.66
Zr	83.8	39.6	28	28.1	25.4	36.9	27.7
Hf	6.38	1.56	1.77	1.61	1.14	1.55	2.45
Ge	4.3	2.92	3.28	3.43	3.2	4.27	4.09
B	14.4	11.7	28.7	14.9	4.75	8.33	22.5
Sn	1.8	1.91	1.7	2.23	0.48	1.55	0.76
F	757	463	636	519	266	826	412
Li	78.3	63.9	73.9	77.2	24.1	100.9	45.8
Be	104.5	107.1	149.1	342.8	131.2	193	125
Nb	34.7	14.6	23	31.8	8.5	27.4	15.9
Cs	18.2	40.8	24.6	120.4	67.8	46.7	33.6
Ta	7.73	2.75	2.78	6.94	1.43	2.72	1.56
W	3.88	1.91	2.12	2.71	0.89	2.57	0.85
Sc	3.3	5.4	1.4	2.5	3.9	1.5	3.1
Rb	253.2	478.2	353.4	604.4	749.3	378	317.6
注：Fe₂O₃值通过实测得TFe₂O₃和FeO含量计算得出，计算公式为Fe₂O₃＝TFe₂O₃-FeO×1.1113。

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表 3 阿拉尔岩体西部含绿柱石伟晶岩脉（DP01-4-3）锆石Hf同位素结果表

Table 3. Zircon Hf isotope results of the beryl bearing pegmatite vein (DP01-4-3)

点号	年龄（Ma）	1s	¹⁷⁶Yb/¹⁷⁷Hf	2SE	¹⁷⁶Lu/¹⁷⁷Hf	2SE	¹⁷⁶Hf/¹⁷⁷Hf	2SE	ε_Hf（0）	2σ	ε_Hf（t）	2σ	T_DM1	T_DM2	f_Lu/Hf
DP01-4-3	205.99	4.32	0.00	0.00	0.000089	0.000000	0.282723	0.000006	−1.73	1.05	2.78	1.05	732	897	−1.00
DP01-4-4	200.31	6.40	0.00	0.00	0.000093	0.000001	0.282732	0.000006	−1.41	1.05	2.98	1.06	719	883	−1.00
DP01-4-5	209.76	5.94	0.00	0.00	0.000066	0.000000	0.282729	0.000007	−1.53	1.05	3.07	1.06	723	886	−1.00
DP01-4-6	202.15	4.24	0.01	0.00	0.000224	0.000003	0.282719	0.000007	−1.87	1.05	2.54	1.06	740	907	−0.99
DP01-4-9	210.20	5.05	0.00	0.00	0.000117	0.000005	0.282721	0.000007	−1.81	1.05	2.79	1.06	735	901	−1.00
DP01-4-10	209.94	4.92	0.00	0.00	0.000030	0.000000	0.282714	0.000007	−2.04	1.05	2.56	1.06	743	912	−1.00
DP01-4-11	204.26	7.02	0.00	0.00	0.000038	0.000000	0.282730	0.000006	−1.50	1.05	2.98	1.06	722	886	−1.00
DP01-4-13	211.52	5.32	0.00	0.00	0.000067	0.000000	0.282716	0.000006	−1.99	1.05	2.65	1.06	741	909	−1.00
DP01-4-17	204.68	10.07	0.00	0.00	0.000093	0.000000	0.282739	0.000006	−1.17	1.05	3.31	1.07	710	869	−1.00
DP01-4-18	201.83	6.07	0.00	0.00	0.000058	0.000001	0.282722	0.000005	−1.76	1.04	2.66	1.05	732	900	−1.00
DP01-4-21	198.40	4.00	0.00	0.00	0.000048	0.000001	0.282733	0.000007	−1.38	1.05	2.97	1.06	717	882	−1.00
DP01-4-22	204.93	6.33	0.01	0.00	0.000188	0.000006	0.282749	0.000006	−0.83	1.05	3.65	1.06	698	852	−0.99
DP01-4-24	202.79	6.17	0.00	0.00	0.000064	0.000001	0.282739	0.000007	−1.16	1.05	3.29	1.06	709	869	−1.00
DP01-4-25	203.61	5.66	0.00	0.00	0.000083	0.000000	0.282718	0.000009	−1.90	1.07	2.56	1.08	738	907	−1.00
DP01-4-26	202.50	5.93	0.01	0.00	0.000469	0.000004	0.282734	0.000010	−1.33	1.09	3.05	1.09	723	881	−0.99
注：该表中的点号与表1中的点号对应。

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新疆北部可可托海地区伟晶岩脉LA–ICP–MS锆石U–Pb年龄、地球化学、Lu–Hf同位素特征及其地质意义

1. 陕西省矿产地质调查中心，陕西 西安 710068 2. 陕西省地质调查院，陕西 西安 710054

作者简介: 蔺新望（1972–），男，高级工程师，长期从事区域地质调查研究工作。E–mail：starcug@126.com

LA–ICP–MS Zircon U–Pb Isotopic Age, Geochemistry, Lu–Hf Isotopic Characteristics and Geological Significance of Pegmatite Vein, in Koktokay Area, Northern Xinjiang

1. Shaanxi Mineral Resources and Geological Survey, Xi’an 710068, Shaanxi , China 2. Shaanxi Institute of Geological Survey, Xi’an 710054, Shaanxi , China

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1.
陕西省矿产地质调查中心，陕西西安　710068

2.
陕西省地质调查院，陕西西安　710054

1.
Shaanxi Mineral Resources and Geological Survey, Xi’an 710068, Shaanxi , China

2.
Shaanxi Institute of Geological Survey, Xi’an 710054, Shaanxi , China