内蒙古红花尔基钨钼矿云英岩化白云母Ar-Ar定年及其地质意义

向安平; 佘宏全; 陈毓川; 秦大军; 王亚军; 韩增光; 康永建

doi:10.15898/j.cnki.11-2131/td.2016.01.017

内蒙古红花尔基钨钼矿云英岩化白云母Ar-Ar定年及其地质意义

1.
中国地质科学院矿产资源研究所, 北京 100037

2.
中国地质大学资源学院, 湖北武汉 430074

3.
内蒙古第六地质矿产勘查开发院, 内蒙古海拉尔 021008

基金项目: 中国地质调查局地质调查项目——大兴安岭关键构造-岩浆-成矿事件研究(1212011120992);国家基础科研项目——大兴安岭中北段中生代多金属矿成矿系统研究(2013CB429800)

详细信息

作者简介: 向安平, 博士研究生, 矿物学、岩石学、矿床学专业。E-mail:xap2011@sina.cn

通讯作者: 佘宏全, 研究员, 硕士研究生导师, 矿物学、岩石学、矿床学专业。E-mail:shehongquan@sina.com

中图分类号: P597.3;P578.959

收稿日期: 2015-08-13

修回日期: 2016-01-07

录用日期: 2016-01-10

刊出日期: 2016-01-25

Ar-Ar Age of Muscovite from the Greisenization Alteration Zones of the Honghuaerji Tungsten Polymetallic Deposit, Inner Mongolia, and Its Geological Significance

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

2.
China University of Geology Sciences, Wuhan 430074, China

3.
The Sixth Institute of Geological Mineral Exploration in Inner Mongolia, Hailaer 021008, China

More Information

Corresponding author: SHE Hong-quan, shehongquan@sina.com

Received Date: 13 August 2015

Revised Date: 07 January 2016

Accepted Date: 10 January 2016

Publish Date: 25 January 2016

摘要

摘要:
红花尔基钨多金属矿是近年在大兴安岭中北部地区发现的一处大型钨多金属矿床, 主要矿化蚀变为云英岩化、绢英岩化, 主要有用金属矿物为白钨矿和辉钼矿, 岩体内辉钼矿与白钨矿有上钼下钨的带状分布特点, 地质特征显示该矿床为一高温热液型钨(钼)矿床。为准确限定成矿热液活动时间, 本文对矿区典型蚀变矿物——云英岩化蚀变带白云母进行Ar-Ar同位素定年, 获得Ar-Ar坪年龄为174.4±1.2 Ma, 等时线年龄为173.2±4.3 Ma。根据矿区云英岩化带与钨钼矿化带空间上重合和密切共生的关系, 可知白云母的形成是与白钨矿、辉钼矿形成同源、同时, 且辉钼矿Re-Os年龄(176.8±2.2 Ma)与Ar-Ar年龄在误差范围内具有一致性, 该年龄代表了钨钼矿热液成矿时代。结合野外地质特征及锆石U-Pb、辉钼矿Re-Os年龄, 进一步限定该矿床成矿时代为早中侏罗世, 属燕山期构造岩浆活动的产物。
- 红花尔基钨矿 /
- 高温热液型钨多金属矿床 /
- 白云母 /
- Ar-Ar定年 /
- 大兴安岭中北段 /
- 燕山期
Abstract:
The newly found Honghuaerji tungsten polymetallic deposit is a large scale tungsten deposit in north-east Daxinganling in China.The alteration includes sericitization and greisenization.The metallic minerals are scheelite and molybdenite.These minerals in rock body show the belt characteristics of W in the top and Mo in the bottom.Geological characteristics indicate that it is a high temperature hydrothermal deposit.In order to constrain the timing of hydrothermal activities, Ar-Ar dating of muscovite from the greisenization alteration zones was carried out.The Ar-Ar dating yields an Ar-Ar plateau age of 174.4±1.2 Ma and an isochron age of 173.2±4.3 Ma.Because greisenization alteration zones and the tungsten(molybdenum) mineralization belt are closely related in space, muscovite, scheelite, and molybdenite may have formed simultaneously.Moreover, the Ar-Ar age of muscovite is in agreement with the Re-Os age of molybdenite(176.8±2.2 Ma) within uncertainties, indicating this Ar-Ar age represents the timing of the tungsten and molybdenum hydrothermal mineralization.Combined field geology, U-Pb ages and Re-Os ages indicate this deposit formed the Jurassic period and may be the product of Yanshanian tectonic magmatic activity.
- Honghuaerji tungsten deposit /
- high temperature hydrothermal type polymetallic deposit /
- muscovite /
- Ar-Ar daling /
- the mid and north parts of Greater Khingan Range /
- the Yanshanian

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图 1 红花尔基钨多金属矿床区域位置图及矿区地质图(图据内蒙古自治区鄂温克自治旗红花尔基矿区钨矿详查报告, 2013修改)

Figure 1.

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图 2 钻孔岩心野外照片

Figure 2.

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图 3 云英岩化蚀变矿物镜下特征

Figure 3.

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图 4 红花尔基矿区蚀变白云母⁴⁰Ar/³⁹Ar坪年龄(a)及等时线图(b)

Figure 4.

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表 1 内蒙红花尔基钨矿区蚀变白云母⁴⁰Ar/³⁹Ar阶段升温测年数据

Table 1. ⁴⁰Ar/³⁹Ar analytical data of muscovite samples from the Honghuaerji tungsten ore, Inner Mongolia

温度(℃)	(⁴⁰Ar/³⁹Ar)_m	(³⁶Ar/³⁹Ar)_m	(³⁷Ar/³⁹Ar)_m	(³⁸Ar/³⁹Ar)_m	⁴⁰Ar(%)	F	³⁹Ar(10^-14mol)	³⁹Ar_Cum(%)	年龄(Ma)	±1s(Ma)
700	35.6955	0.0572	62.4387	0.0226	65.01	24.434	0.06	0.21	218	25
800	23.2203	0.0073	0	0.0135	90.74	21.0694	0.74	2.61	189.7	1.9
860	21.3506	0.0053	5.9826	0.0135	94.63	20.3021	1.49	7.45	183.1	2
900	21.2477	0.0059	4.2324	0.0136	93.21	19.8728	1.42	12.06	179.5	1.9
940	20.4809	0.0047	1.1118	0.0135	93.54	19.1744	6.49	33.17	173.4	1.7
980	19.4412	0.0014	1.0641	0.0128	98.21	19.1098	5.93	52.47	172.9	1.7
1020	19.5667	0.0017	2.028	0.0128	98.07	19.2202	3.98	65.4	173.8	1.7
1060	20.0653	0.0035	2.3307	0.0133	95.68	19.2339	2	71.92	174	1.8
1100	20.5005	0.005	7.6523	0.0134	95.35	19.6687	1.3	76.16	177.7	1.8
1150	20.333	0.0045	2.4998	0.0133	94.28	19.2088	1.92	82.4	173.7	1.8
1220	19.8188	0.0026	2.1707	0.0131	96.84	19.2271	4.2	96.06	173.9	1.7
1400	19.6256	0.0015	3.9562	0.0129	99.09	19.509	1.21	100	176.3	1.8

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内蒙古红花尔基钨钼矿云英岩化白云母Ar-Ar定年及其地质意义

1. 中国地质科学院矿产资源研究所, 北京 100037 2. 中国地质大学资源学院, 湖北 武汉 430074 3. 内蒙古第六地质矿产勘查开发院, 内蒙古 海拉尔 021008

作者简介: 向安平, 博士研究生, 矿物学、岩石学、矿床学专业。E-mail:xap2011@sina.cn

通讯作者: 佘宏全, 研究员, 硕士研究生导师, 矿物学、岩石学、矿床学专业。E-mail:shehongquan@sina.com

Ar-Ar Age of Muscovite from the Greisenization Alteration Zones of the Honghuaerji Tungsten Polymetallic Deposit, Inner Mongolia, and Its Geological Significance

1. Institute of Mineral Resources, China Academy of Geology Sciences, Beijing 100037, China 2. China University of Geology Sciences, Wuhan 430074, China 3. The Sixth Institute of Geological Mineral Exploration in Inner Mongolia, Hailaer 021008, China

Corresponding author: SHE Hong-quan, shehongquan@sina.com

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1.
中国地质科学院矿产资源研究所, 北京 100037

2.
中国地质大学资源学院, 湖北武汉 430074

3.
内蒙古第六地质矿产勘查开发院, 内蒙古海拉尔 021008

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

2.
China University of Geology Sciences, Wuhan 430074, China

3.
The Sixth Institute of Geological Mineral Exploration in Inner Mongolia, Hailaer 021008, China