内蒙古武川县赵井沟铌钽多金属矿床白云母<sup>40</sup>Ar-<sup>39</sup>Ar同位素年龄及地质意义

高允; 孙艳; 赵芝; 李建康; 何晗晗; 杨岳清

doi:10.15898/j.cnki.11-2131/td.201612290190

内蒙古武川县赵井沟铌钽多金属矿床白云母⁴⁰Ar-³⁹Ar同位素年龄及地质意义

1.
中国地质科学院矿产资源研究所, 北京 100037

2.
中国地质大学(北京)地球科学与资源学院, 北京 100083

基金项目:
国家自然科学基金资助项目“柴达木盆地大风山特大型天青石矿床锶的富集成矿机制研究”（41402084）；中国地质调查局地质调查项目“我国三稀金属资源战略调查”（1212011220803），我国稀有、稀散资源战略调查及研究（1212011220805），中国矿产地质与成矿规律综合集成和服务（矿产地质志）（DD20160346）

详细信息

作者简介: 高允, 硕士研究生, 主要从事矿物学、矿石学、矿床学方面的研究。E-mail:gaoyun_10@163.com

通讯作者: 孙艳, 高级工程师, 主要从事三稀金属资源战略调查研究工作。E-mail:sunyan517@vip.163.com

中图分类号: P618.79;P618.86;P619.273

收稿日期: 2016-12-29

修回日期: 2017-01-23

录用日期: 2017-03-20

⁴⁰Ar-³⁹Ar Dating of Muscovite from the Zhaojinggou Nb-Ta Polymetallic Deposit in Wuchuan County of Inner Mongolia and Its Geological Implications

1.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
College of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Corresponding author: Yan SUN, sunyan517@vip.163.com

Received Date: 29 December 2016

Revised Date: 23 January 2017

Accepted Date: 20 March 2017

摘要

摘要: 内蒙古赵井沟铌钽多金属矿是近年来取得较大找矿进展的大型稀有金属矿床，初步探明铌钽氧化物储量超过8200吨，前人对其矿床地质特征已有初步研究，但其成矿时代尚未精确厘定。本文以赵井沟铌钽多金属矿区内天河石花岗伟晶岩脉中的白云母为研究对象，利用⁴⁰Ar-³⁹Ar同位素年代学方法，以确定其成矿时代。研究发现矿区内铌钽矿化主要赋存在碱长花岗岩、碱长花岗细晶岩、云英岩和天河石花岗伟晶岩中，且铌钽矿物与白云母同时形成，有重要的共生关系，故本次研究获得的白云母坪年龄123.57±0.66 Ma和等时线年龄124.0±2.0 Ma具有地质意义，可代表成矿年龄。这一成果表明赵井沟铌钽多金属矿床形成于燕山晚期（至少延续至早白垩世），与前人获得的锆石年龄有较大差异，这对分析其矿床成因有重要意义。同时，结合区域地质资料，本文认为华北地台北缘内蒙古地轴中部在燕山运动的晚期存在一次重要的稀有金属成矿事件。
- 铌钽多金属矿床 /
- 天河石花岗伟晶岩 /
- 白云母 /
- ⁴⁰Ar-³⁹Ar同位素年龄 /
- 赵井沟
Abstract: The Zhaojinggou Nb-Ta polymetallic deposit in Inner Mongolia is a newly discovered large rare metal ore deposit. The reserve of Nb-Ta oxides is more than 8200 tons. Previous studyfocus on geological features of this deposit, but they the precise mineralization age remains unknown. In this paper, muscovite in amazonite granite pegmatite was used to constrain the timing of mineralization using ⁴⁰Ar-³⁹Ar isotope method. Results show that Nb-Ta mineralization is mainly hosted in alkali-feldspar granite, alkali-feldspar aplite, greisen, and amazonite granite pegmatite. According to the geologicalrelationship between Nb-Ta minerals and muscovite, we can infer that Nb-Ta minerals and muscovite are formed at the same time. Thus, the muscovite plateau ages of 123.57±0.66 Ma and 124.0±2.0 Ma can represent the mineralization age. Results show that the Zhaojinggou Nb-Ta polymetallic deposit was formed at late Yanshanian (or at least Early Cretaceous), the ⁴⁰Ar-³⁹Ar age have bigger difference with the zircon age, which is of great importance for ore genesis. Combining with regional geology, the author thinks that an essential rare-metal mineralization happened in the middle part of inner Mongolian axis on the north margin of north china platform during the late Yanshan movement.
- Nb-Ta polymetallic deposit /
- amazonite granite pegmatite /
- muscovite /
- ⁴⁰Ar-³⁹Ar isotope age /
- Zhaojinggou

HTML全文

图 1 内蒙古呼和浩特武川区域地质简图(据文献[3, 7]改编)

Figure 1.

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图 2 内蒙古武川县赵井沟铌钽矿床(a)地质略图及(b)第Ⅲ号地质勘探线剖面简图(据文献[3]改编)

Figure 2.

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图 3 赵井沟铌钽多金属矿床⁴⁰Ar-³⁹Ar样品照片：(a)矿石照片；(b)显微照片(正交偏光)

Figure 3.

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图 4 内蒙古赵井沟铌钽多金属矿床白云母(a)⁴⁰Ar-³⁹Ar坪年龄和(b)等时线年龄图

Figure 4.

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表 1 内蒙古赵井沟矿区白云母⁴⁰Ar-³⁹Ar同位素测年结果

Table 1. ⁴⁰Ar-³⁹Ar isotopic dating results of the muscovite of the Zhaojinggou Nb-Ta polymetallic deposit, Inner Mongolia

T(℃)	(⁴⁰Ar/³⁹Ar)_m	⁽³⁶Ar/³⁹Ar)_m	(³⁷Ar/³⁹Ar)_m	(³⁸Ar/³⁹Ar)_m	⁴⁰Ar(%)	³⁹Ar(10^-14 mol)	³⁹Ar积累(%)	年龄(Ma)	±1σ(Ma)
700	30.0152	0.0743	0.0000	0.0292	26.81	0.29	0.68	71.2	1.8
800	14.6119	0.0053	0.0000	0.0134	89.25	2.25	5.96	114.0	1.1
850	14.3507	0.0012	0.0000	0.0127	97.54	2.32	11.41	122.1	1.2
900	14.3671	0.0009	0.0000	0.0125	98.17	2.69	17.75	123.0	1.2
950	14.5290	0.0014	0.0000	0.0128	97.11	2.75	24.21	123.0	1.2
1000	14.8828	0.0023	0.0000	0.0128	95.30	2.94	31.11	123.6	1.2
1040	15.1928	0.0034	0.0000	0.0131	93.38	3.37	39.02	123.7	1.2
1080	15.3639	0.0042	0.0042	0.0134	91.97	3.96	48.32	123.2	1.2
1120	15.2963	0.0037	0.0000	0.0132	92.78	4.13	58.03	123.7	1.2
1160	15.1614	0.0030	0.0000	0.0130	94.04	3.47	66.18	124.3	1.2
1200	15.0755	0.0027	0.0000	0.0129	94.77	4.58	76.95	124.5	1.2
1240	15.1783	0.0030	0.0000	0.0130	94.21	5.31	89.43	124.6	1.2
1280	15.5225	0.0044	0.0170	0.0133	91.56	2.31	94.86	123.9	1.2
1340	15.6267	0.0047	0.0000	0.0131	91.10	0.87	96.91	124.1	1.4
1400	15.4725	0.0047	0.0000	0.0137	91.02	1.10	99.50	122.8	1.2
1430	18.1905	0.0135	0.0000	0.0157	78.09	0.21	100.00	123.8	2.5
注：表中标m代表样品中测定的同位素比值总年龄=122.8 Ma。

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内蒙古武川县赵井沟铌钽多金属矿床白云母40Ar-39Ar同位素年龄及地质意义

1. 中国地质科学院矿产资源研究所, 北京 100037 2. 中国地质大学(北京)地球科学与资源学院, 北京 100083

作者简介: 高允, 硕士研究生, 主要从事矿物学、矿石学、矿床学方面的研究。E-mail:gaoyun_10@163.com

通讯作者: 孙艳, 高级工程师, 主要从事三稀金属资源战略调查研究工作。E-mail:sunyan517@vip.163.com

40Ar-39Ar Dating of Muscovite from the Zhaojinggou Nb-Ta Polymetallic Deposit in Wuchuan County of Inner Mongolia and Its Geological Implications

1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China 2. College of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China

Corresponding author: Yan SUN, sunyan517@vip.163.com

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内蒙古武川县赵井沟铌钽多金属矿床白云母⁴⁰Ar-³⁹Ar同位素年龄及地质意义

1.
中国地质科学院矿产资源研究所, 北京 100037

2.
中国地质大学(北京)地球科学与资源学院, 北京 100083

⁴⁰Ar-³⁹Ar Dating of Muscovite from the Zhaojinggou Nb-Ta Polymetallic Deposit in Wuchuan County of Inner Mongolia and Its Geological Implications

1.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
College of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China