南祁连哈拉湖地区中奥陶世花岗岩地球化学特征及年代学意义

李五福; 张新远; 曹锦山; 王国良; 王春涛; 王伟; 乔国栋; 刘建栋; 陈丽娟

南祁连哈拉湖地区中奥陶世花岗岩地球化学特征及年代学意义

1.
青海省地质调查院, 青海西宁 810012

2.
青海省青藏高原北部地质过程与矿产资源重点实验室, 青海西宁 810012

基金项目:
中国地质调查局项目《青海区域地质调查与片区总结》（编号：12120114079701）和《青海省德令哈市哈拉湖西地区四幅1：5万区域地质矿产调查》（编号：1212011221151）

详细信息

作者简介: 李五福(1982-), 男, 硕士, 高级工程师, 从事区域地质调查研究。E-mail:15422504@qq.com

通讯作者: 张新远(1988-), 男, 硕士, 工程师, 从事区域地质调查研究。E-mail:235299800@qq.com

中图分类号: P534.42;P588.12⁺1

收稿日期: 2018-11-27

修回日期: 2019-01-18

刊出日期: 2020-03-15

Geochemical characteristics and chronological significance of Middle Ordovician granite in Halahu area of southern Qilian Mountain

1.
Geological Survey Institute of Qinghai Province, Xi'ning 810012, Qinghai, China

2.
Northern Tibetan Plateau Geological Process and Mineral Resources Key Laboratory of Qinghai Province, Xi'ning 810012, Qinghai, China

More Information

Corresponding author: ZHANG Xinyuan, 235299800@qq.com

Received Date: 27 November 2018

Revised Date: 18 January 2019

Publish Date: 15 March 2020

摘要

摘要:
哈拉湖地区奥陶纪花岗岩相对富钠（Na₂O>K₂O），具有中钾-高钾钙碱性系列特征，岩石类型以辉长闪长岩和花岗闪长岩为主。岩石稀土及微量元素特征均显示物质来源有地幔物质参与，构造环境判别图显示形成于大洋俯冲的环境。利用LA-ICP-MS进行锆石U-Pb同位素年龄测定，样品锆石²⁰⁶Pb/²³⁸U年龄加权平均值为466±4 Ma，限定该花岗岩的形成时代为中奥陶世，该时期北祁连洋发生双向扩张俯冲，南部中祁连陆块遭受俯冲挤压，导致地幔物质上涌，同时陆壳部分熔融，岩体为两者混合形成的产物，该岩体年龄的确定为祁连洋的多阶段俯冲提供了新的证据。
- 南祁连 /
- 奥陶纪 /
- 岛弧 /
- 花岗岩
Abstract:
The Ordovician granite in the Hala Lake area is characterized by relatively rich sodium (Na₂O>K₂O) and medium potassium-high potassium calc-alkaline series.Rock types include gabbroic diorite and granodiorite.The whole-rock rare earth and trace element characteristics indicate that the material source was derived from mantle material, and the tectonic environment was most likely the island arc granite formed during the ocean subduction.The zircon U-Pb isotope ages were determined by LA-ICP-MS.These zircons yielded a ²⁰⁶Pb/²³⁸U weighted mean age of 466±4 Ma, suggesting that the granite was formed in Middle Ordovician.In the two-way expansion and subduction stage of the North Qilian Ocean, the southern Zhongqilian block was subjected to subduction and extrusion, which caused the mantle material to migrate upward.At the same time, the continental crust was partially melted and the intrusions were formed by the mixture of the two melts.The age of the intrusion provides new evidence for multi-stage subduction of the Qilian Ocean.
- South Qilian /
- Ordovician /
- island arc /
- granite

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图 1 哈拉湖地区大地构造位置图(a, 据参考文献[35]修改)和地质简图(b)

Figure 1.

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图 2 哈拉湖中奥陶世侵入岩TAS图解^[36]

Figure 2.

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图 3 英云闪长岩野外(a)和镜下照片(b)

Figure 3.

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图 4 哈拉湖中奥陶世侵入岩SiO₂-K₂O(a)和AFM图解(b)

Figure 4.

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图 5 哈拉湖中奥陶世侵入岩稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b)

Figure 5.

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图 6 哈拉湖地区辉长闪长岩同位素测年锆石阴极发光图像(IU-Pb0803)

Figure 6.

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图 7 哈拉湖地区辉长闪长岩锆石U-Pb谐和图(a)和²⁰⁶Pb/²³⁸U年龄加权平均值图(b)(IU-Pb0803)

Figure 7.

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表 1 哈拉湖地区中奥陶世侵入岩地球化学分析结果

Table 1. Geochemical compositions of Middle Ordovician intrusions in Halahu area

样品号	ⅠGs2003	IGsC3097 -1	QⅣPM21GS5 -1	ⅠPm103Gs2 -1	ⅠPm103Gs16 -1	ⅠGS0809
岩性	石英闪长岩		英云闪长岩		辉长闪长岩
SiO₂	56.89	57.45	57.99	50.44	50.45	51.64
TiO₂	0.80	0.80	0.77	0.83	0.90	0.74
Al₂O₃	14.87	15.53	16.32	12.19	12.27	12.26
Fe₂O₃	3.47	3.97	3.78	2.23	2.14	1.36
FeO	4.12	3.73	4.75	7.65	7.67	8.80
MnO	0.12	0.12	0.16	0.17	0.18	0.20
MgO	4.71	4.41	3.79	9.07	8.99	9.46
CaO	5.14	4.48	3.30	10.08	10.11	6.85
Na₂O	2.64	2.81	5.56	2.10	2.34	2.35
K₂O	2.64	2.72	0.90	1.59	1.43	2.04
P₂O₅	0.26	0.27	0.14	0.17	0.23	0.24
烧失量	3.62	3.01	1.84	2.40	2.27	3.24
总量	99.71	99.70	99.73	99.76	99.74	99.74
Mg^#	60.32	59.57	51.86	65.41	65.25	64.33
A/NK	2.07	2.05	1.61	2.36	2.27	2.02
A/CNK	0.90	0.99	1.01	0.52	0.52	0.66
La	23.70	22.80	10.77	16.06	18.06	21.46
Ce	45.54	46.30	23.36	32.07	36.55	42.58
Pr	5.72	5.95	3.10	4.13	5.14	5.27
Nd	22.12	22.91	12.81	16.84	21.57	20.34
Sm	4.38	4.44	3.12	3.62	4.71	4.37
Eu	1.09	1.15	0.92	0.96	1.21	1.09
Gd	4.08	3.97	3.24	3.62	4.42	3.79
Tb	0.70	0.63	0.59	0.59	0.71	0.64
Dy	3.82	3.87	3.77	3.27	3.73	3.69
Ho	0.81	0.77	0.84	0.68	0.76	0.76
Er	2.27	2.15	2.46	1.85	2.09	2.07
Tm	0.35	0.34	0.38	0.30	0.32	0.34
Yb	2.32	2.07	2.50	2.00	2.04	2.04
Lu	0.35	0.31	0.37	0.32	0.30	0.30
Sr	474.99	484.95	300.81	428.41	448.96	277.45
Rb	87.91	87.36	20.10	35.85	28.86	61.12
Ba	671.66	760.40	246.84	379.85	439.84	405.40
Th	8.05	9.21	5.41	4.96	5.68	7.13
Ta	0.70	0.69	0.47	1.28	0.82	0.54
Nb	6.31	7.46	6.16	5.53	6.12	7.09
Zr	124.90	129.00	82.20	67.70	75.00	96.40
Hf	4.31	4.52	2.43	2.04	2.36	2.57
Cr	115.81	91.19	30.35	274.80	279.40	369.60
V	207.94	183.50		272.83	252.36	220.00
U	1.57	1.73	1.14	1.03	1.24	1.71
Y	20.22	19.43	20.56	17.40	19.09	17.77
Sc	19.20	18.18		38.23	41.17	30.16
注：主量元素含量单位为%，微量和稀土元素含量单位为10^-6

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表 2 哈拉湖地区辉长闪长岩锆石U-Th-Pb同位素测定结果(IU-Pb0803)

Table 2. Zircon U-Th-Pb isotope determination results for gabbroic diorite in Halahu area

点号	Pb /10^-6	U /10^-6	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U 年龄/Ma	1σ	²⁰⁷Pb/²³⁵U 年龄/Ma	1σ
1	59	777	0.0758	0.0008	0.602	0.012	0.0575	0.0009	0.0303	0.0010	0.0247	0.0005	471	5	478	10
2	98	714	0.1424	0.0014	1.342	0.019	0.0683	0.0008	0.0472	0.0013	0.137	0.001	858	8	864	12
3	41	502	0.0780	0.0008	0.620	0.013	0.0576	0.0011	0.0215	0.0006	0.572	0.003	484	5	490	10
4	44	574	0.0758	0.0007	0.598	0.009	0.0572	0.0008	0.0261	0.0006	0.318	0.002	471	5	476	7
5	23	294	0.0757	0.0007	0.590	0.014	0.0565	0.0012	0.0230	0.0005	0.3880	0.0004	470	5	471	11
6	38	474	0.0758	0.0007	0.592	0.012	0.0566	0.0011	0.0224	0.0005	0.528	0.001	471	5	472	10
7	41	570	0.0716	0.0007	0.565	0.010	0.0572	0.0009	0.0331	0.0008	0.2261	0.0001	446	5	455	8
8	49	590	0.0797	0.0008	0.640	0.009	0.0582	0.0008	0.0130	0.0004	0.924	0.002	494	4	502	7
9	91	1181	0.0762	0.0008	0.610	0.010	0.0581	0.0008	0.0224	0.0006	0.369	0.003	473	5	484	8
10	34	449	0.0743	0.0007	0.590	0.011	0.0576	0.0010	0.0242	0.0006	0.3392	0.0007	462	5	471	9
11	94	1275	0.0727	0.0007	0.576	0.008	0.0575	0.0007	0.0230	0.0005	0.3392	0.0004	453	4	462	7
12	53	676	0.0759	0.0007	0.598	0.014	0.0572	0.0013	0.0241	0.0006	0.3989	0.0004	472	4	476	11
13	19	244	0.0750	0.0008	0.599	0.018	0.0579	0.0016	0.0125	0.0003	0.946	0.005	466	5	477	14
14	43	568	0.0737	0.0007	0.577	0.011	0.0568	0.0010	0.0215	0.0005	0.4411	0.0003	458	5	462	9
15	73	995	0.0736	0.0007	0.578	0.009	0.0570	0.0009	0.0165	0.0004	0.450	0.003	458	4	463	7
16	46	762	0.0587	0.0006	0.446	0.007	0.0551	0.0008	0.0100	0.0003	0.7160	0.0005	368	5	374	6
17	60	821	0.0749	0.0007	0.589	0.010	0.0570	0.0008	0.0160	0.0005	0.317	0.002	465	4	470	8
18	44	564	0.0748	0.0007	0.583	0.012	0.0565	0.0011	0.0219	0.0006	0.490	0.001	465	4	466	9
20	28	405	0.0735	0.0007	0.576	0.013	0.0569	0.0013	0.0210	0.0005	0.0628	0.0000	457	4	462	11
21	35	471	0.0742	0.0007	0.585	0.011	0.0572	0.0009	0.0217	0.0005	0.3703	0.0004	462	4	468	8
22	150	1821	0.0732	0.0007	0.596	0.009	0.0590	0.0007	0.0210	0.0005	0.819	0.002	456	5	475	7
23	122	1841	0.0647	0.0006	0.498	0.007	0.0559	0.0007	0.0160	0.0004	0.497	0.002	404	4	411	6
24	95	1320	0.0722	0.0007	0.560	0.008	0.0563	0.0007	0.0226	0.0006	0.3214	0.0007	449	4	452	7

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