内蒙古白乃庙铜矿区含矿中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及成矿时代

赵利刚; 李承东; 常青松; 高学生; 许雅雯; 樊建廷; 张阔

内蒙古白乃庙铜矿区含矿中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及成矿时代

1. 天津地质矿产研究所, 天津 300170;
2. 内蒙古第四地质矿产勘查开发院, 内蒙古集宁 012000

收稿日期: 2015-10-23

修回日期: 2016-03-07

刊出日期: 2016-04-15

A tentative discussion on zircon U-Pb geochronology and geochemistry of ore-bearing intermediate-acid intrusive rocks in the Bainaimiao copper ore district and the metallogenic epoch

1. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;
2. The Fourth Institute of Geology and Mineral Exploration and Development, Jining 012000, Inner Mongolia, China

Received Date: 23 October 2015

Revised Date: 07 March 2016

Publish Date: 15 April 2016

摘要

摘要: 为了限定白乃庙铜矿的成矿时代和成矿环境,对含矿中酸性岩类进行同位素年龄和岩石地球化学研究。获得的3个含矿花岗闪长岩样品的LA-MC-ICP-MS锆石U-Pb年龄分别为421.5±1.8Ma、438.6±3.4Ma和459.3±3.6Ma。含矿中酸性岩类属于过铝质钙碱性系列岩石,稀土元素曲线显示为轻稀土元素富集型,具有弱正Eu异常,微量元素曲线表现为明显的Ta、Nb亏损。综合含矿中酸性岩类时代、地球化学特征及区域构造背景,认为白乃庙铜矿总体形成于早古生代,具有多期成矿的特点,成矿作用与古蒙古洋早古生代俯冲消减事件有关。
Abstract: In order to determine the metallogenic epoch and ore-forming environment of the Bainaimiao copper deposit, the au-thors carried out research on isotope geochronology and geochemistry of ore-bearing intermediate-acid rocks. LA-MC-ICPMS zir-con U-Pb dating shows that the ages of three ore-bearing granodiorites samples are 421.5±1.8Ma, 438.6±3.4Ma and 459.3±3.6Ma respectively. These rocks have peraluminous calc-lkaline characteristics, and are enriched in LREE. There is a weak positive anomaly of Eu. The trace elements are obviously depleted in Ta and Nb. According to comprehensive ages and geochemical characteristics of ore-bearing granodiorites and the regional tectonic background, the authors consider that the Bainaimiao copper deposit was on the whole formed in the early Paleozoic and characterized by multi-period mineralization. In addition, the metallogenesis was related to the subduction event of ancient Mongolia Ocean in the Early Paleozoic.
- Bainaimiao copper deposit /
- intermediate-acid rocks /
- LA-MC-ICP-MS zircon U-Pb age /
- geochemistry /
- mineraliza- tion age

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参考文献(26)

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内蒙古白乃庙铜矿区含矿中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及成矿时代

1. 天津地质矿产研究所, 天津 300170;2. 内蒙古第四地质矿产勘查开发院, 内蒙古 集宁 012000

A tentative discussion on zircon U-Pb geochronology and geochemistry of ore-bearing intermediate-acid intrusive rocks in the Bainaimiao copper ore district and the metallogenic epoch

1. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;2. The Fourth Institute of Geology and Mineral Exploration and Development, Jining 012000, Inner Mongolia, China

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1. 天津地质矿产研究所, 天津 300170;
2. 内蒙古第四地质矿产勘查开发院, 内蒙古集宁 012000

1. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;
2. The Fourth Institute of Geology and Mineral Exploration and Development, Jining 012000, Inner Mongolia, China