四川甲基卡稀有金属矿床134号脉锡石U-Pb定年与地质意义

周雄; 周玉; 孙宝伟; 谭洪旗; 岳相元; 朱志敏

doi:10.15898/j.cnki.11-2131/td.202005060006

四川甲基卡稀有金属矿床134号脉锡石U-Pb定年与地质意义

1.
中国地质科学院矿产综合利用研究所, 四川成都 610041

2.
中国地质调查局稀土资源应用技术创新中心, 四川成都 610041

3.
中国地质调查局金属矿产资源综合利用技术研究中心, 四川成都 610041

4.
四川省地质矿产勘查开发局四〇五地质队, 四川都江堰 611830

基金项目:
中国地质调查局地质调查项目(DD20190185)

详细信息

作者简介: 周雄, 博士, 副研究员, 矿物学、岩石学、矿床学专业。E-mail: zhouxiong27@163.com

中图分类号: P575.4

收稿日期: 2020-04-25

修回日期: 2020-07-14

录用日期: 2020-09-19

刊出日期: 2021-01-28

Cassiterite U-Pb Dating of No.134 Pegmatite Vein in the Jiajika Rare Metal Deposit, Western Sichuan and Its Geological Significances

1.
Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China

2.
Technology Innovation Center of Rare Earth Resources Application, China Geological Survey, Chengdu 610041, China

3.
Technology Innovation Center of Rare Earth Resources Development and Utilization, China Geological Survey, Chengdu 610041, China

4.
The 405 Geological Brigade of Sichuan Bureau of Geology&Mineral Resources, Dujiangyan 611830, China

Received Date: 25 April 2020

Revised Date: 14 July 2020

Accepted Date: 19 September 2020

Publish Date: 28 January 2021

摘要

摘要:
伟晶岩型锂矿是重要的新兴产业资源，具有重要的战略价值，是我国亟需紧缺的关键矿产。然而，成矿年代学制约了该类型锂矿的成矿作用和成矿机理研究。四川甲基卡稀有金属矿床是我国最大的锂矿床，以134号伟晶岩脉为典型代表。134号伟晶岩脉主要由锂辉石、钽铌铁矿、锆石、曲晶石、绿柱石、锡石、微斜长石、正长石、石英、白云母等组成。本文采集了134号脉中部矿石样品，分选获得锡石，通过LA-MC-ICP-MS锡石U-Pb测年，获得134号伟晶岩脉的锡石U-Pb年龄为203.7±4.6Ma (n=19，MSWD=2.8)，代表了该伟晶岩型锂矿床的成矿年龄，表明其成矿作用发生在印支晚期。印支运动晚期稳定的构造环境，为稀有金属的聚集、成矿创造了有利条件，有助于形成甲基卡超大型稀有金属矿床。
- 锡石U-Pb定年 /
- 年代学 /
- 伟晶岩型锂矿床 /
- 甲基卡 /
- 川西
Abstract: BACKGROUND
The pegmatite lithium deposit has become important for modern industries with strategic value, which is a key mineral resource in urgent need in China. However, the mineralization age restricts the research on the mineralization process and mechanism of this type of lithium deposit. The Jiajika rare metal deposit is the largest pegmatite lithium deposit of China in the western Sichuan, and the No.134 vein is the most typical pegmatite vein. The No.134 pegmatite vein is mainly composed of spodumene, tantalite, zircon, beryl, cassiterite, plagioclase, orthoclase, quartz and muscovite.
OBJECTIVES
To accurately constrain the mineralization age of the No.134 pegmatite vein.
METHODS
Laser ablation-multiple collector-inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS) U-Pb geochronology was used on cassiterite.
RESULTS
The concordant age in the ore samples was 203.7±4.6Ma, which represented the mineralization age of No.134 pegmatite vein. This age indicated mineralization in the Late Indosinian period.
CONCLUSIONS
The stable tectonic environment in the Late Indosinian movement is the favorable condition for accumulation and mineralization of rare metals, which is beneficial for the formation of the super-large Jiajika rare metal deposit.
- cassiterite U-Pb dating /
- geochronology /
- pegmatitic lithium deposit /
- Jiajika /
- western Sichuan

HTML全文

图 1 锡石阴极发光图像

Figure 1.

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图 2 甲基卡134号伟晶岩脉含锂辉石伟晶岩锡石U-Pb年龄谐和图

Figure 2.

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表 1 134号伟晶岩脉锡石LA-MC-ICP-MS U-Pb同位素测试数据

Table 1. LA-MC-ICP-MS U-Pb isotopic data of cassiterite in the No.134 pegmatite vein

样品编号	含量(10^-6)			同位素比值
样品编号	Pb	Th	U	²³⁸U/²⁰⁶Pb	误差(2σ)	²⁰⁷Pb/²⁰⁶Pb	误差(2σ)
134-11.01	0.28	0.14	11.92	31.69	2.21	0.06	9.29
134-11.02	0.90	0.16	36.35	30.28	1.36	0.05	5.57
134-11.03	0.07	0.02	1.70	24.20	5.36	0.19	18.09
134-11.04	0.07	0.26	2.94	32.00	4.54	0.07	19.73
134-11.05	0.08	0.33	2.95	30.07	5.32	0.08	24.96
134-11.06	0.16	0.04	6.54	31.66	3.04	0.07	12.06
134-11.07	0.50	0.18	7.52	14.48	2.81	0.14	8.76
134-11.08	0.30	0.02	11.74	29.69	2.00	0.06	9.66
134-11.09	0.16	0.08	2.76	14.81	3.44	0.12	9.77
134-11.10	0.21	0.05	1.13	9.16	4.76	0.49	11.20
134-11.11	0.21	0.02	7.13	29.28	2.81	0.12	9.70
134-11.12	-	-	-	0.78	149.93	1.18	63.70
134-11.13	0.47	0.21	19.05	30.40	1.80	0.05	7.54
134-11.14	0.28	0.02	1.05	8.00	6.07	0.67	9.24
134-11.15	0.09	0.05	3.15	29.55	4.00	0.09	17.59
134-11.16	0.34	0.13	13.60	30.45	2.05	0.06	9.34
134-11.17	0.10	0.17	3.94	30.05	3.98	0.06	17.90
134-11.18	0.67	0.03	27.73	31.04	1.43	0.05	6.93
134-11.19	0.20	0.19	8.36	30.81	2.53	0.05	12.79
134-11.20	0.56	0.08	22.88	30.69	1.59	0.05	7.72
134-11.21	0.06	0.38	2.39	31.95	5.08	0.08	24.38
134-11.22	0.38	0.02	13.69	28.14	2.14	0.07	8.36
134-11.23	0.31	0.04	7.95	26.27	3.18	0.17	7.34
134-11.24	0.02	0.11	0.51	27.11	10.22	0.10	36.51
134-11.25	0.89	0.17	36.59	30.76	1.33	0.05	5.74
134-11.26	0.29	0.02	10.33	30.20	2.54	0.09	7.44
134-11.27	0.15	0.03	3.30	23.00	5.03	0.21	12.10
134-11.28	0.59	0.13	12.60	22.85	2.14	0.17	4.71
134-11.29	0.22	0.02	6.20	28.45	2.85	0.15	9.25
134-11.30	0.07	0.02	2.08	27.34	6.85	0.11	29.08
134-11.31	0.01	0.06	0.39	27.24	10.45	0.10	37.10
134-11.32	0.13	0.06	5.15	31.21	3.50	0.06	14.70
134-11.33	0.69	0.03	11.83	17.38	2.24	0.15	4.85
134-11.34	0.24	0.18	9.65	30.18	2.42	0.05	12.06
134-11.35	0.02	0.03	0.42	21.56	10.39	0.24	28.30
134-11.36	0.18	0.02	2.85	21.29	4.85	0.32	12.32
注：“-”表示未检出。

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表 2 甲基卡地区稀土金属矿床同位素年龄统计

Table 2. Isotope ages for rare metal deposits in Jiajika area

年龄	测试对象	矿物	测试方法	年龄(Ma)	资料来源
成矿年龄	104钠长石伟晶岩脉	白云母	⁴⁰Ar-³⁹Ar	198.88±0.3	[11]
	134锂辉石伟晶岩脉	白云母	⁴⁰Ar-³⁹Ar	195.67±0.14	[11]
	308号伟晶岩脉	锡石	LA-MC-ICP-MS	210.9±4.6	[20]
	X03伟晶岩脉	锆石	LA-ICP-MS	216±2	[17]
	X03伟晶岩脉	铌钽铁	LA-ICP-MS	214±2	[17]
	134号伟晶岩脉	锡石	LA-MC-ICP-MS	203.7±4.6	本文
成岩年龄	马颈子二云母花岗岩	锆石	LA-ICP-MS	223±0.3	[17]
	容须卡石英闪长岩	锆石	LA-ICP-MS	214.4±1.2	[28]
	长征二长花岗岩	锆石	LA-ICP-MS	202.2±1.3	[29]
	长征二长花岗岩	锆石	LA-ICP-MS	202.2±1.5	[29]
	松林口二长花岗岩	锆石	LA-ICP-MS	208.9±1.1	[32]
	松林口二长花岗岩(中部)	锆石	LA-ICP-MS	222.4±1.1	[33]
	松林口花岗闪长岩(边部)	锆石	LA-ICP-MS	212.6±1.0	[33]
	松林口中部暗色包体	锆石	LA-ICP-MS	225.2±1.0	[33]

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四川甲基卡稀有金属矿床134号脉锡石U-Pb定年与地质意义

作者简介: 周雄, 博士, 副研究员, 矿物学、岩石学、矿床学专业。E-mail: zhouxiong27@163.com

Cassiterite U-Pb Dating of No.134 Pegmatite Vein in the Jiajika Rare Metal Deposit, Western Sichuan and Its Geological Significances

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