| 安徽铜陵新桥铜-金矿床的He、Ar同位素组成及其意义 |
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| 引用本文： | 王彦斌,曾普胜,李延河,蒙义峰,杨竹森,田世洪.安徽铜陵新桥铜-金矿床的He、Ar同位素组成及其意义[J].现代地质,2004,18(4):524-528. |
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| 作者姓名： | 王彦斌 曾普胜 李延河 蒙义峰 杨竹森 田世洪 |
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| 作者单位： | 1. 中国地质科学院,地质研究所,北京,100037
2. 中国地质科学院,矿产资源研究所,北京,100037 |
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| 基金项目： | 国土资源部国际合作与科技司重点项目(20010209)。 |
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| 摘 要： | 对安徽铜陵新桥铜 金矿床层状矿体和块状矿体的黄铁矿进行了流体包裹体的He、Ar同位素研究。结果表明,成矿流体的N(40Ar)/N(36Ar)≈238～293,N(3He)/N(4He)≈1 03～1 23Ra,与大气饱和水(包括大气降水和海水)的特征值N(3He)/N(4He)=1Ra,N(40Ar)/N(36Ar)=295 5非常接近,表明成矿流体含大气降水和海水,这与野外地质特征也相符合,反映了成矿流体来自海底喷流(热水)沉积作用过程,这一认识为该区铜 金矿床可能的海底热液喷流成因提供了新的证据。
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| 关 键 词： | He和Ar同位素 流体包裹体 新桥 铜陵 安徽 |
| 文章编号： | 1000-8527(2004)04-0524-05 |
| 修稿时间： | 2004年5月10日 |
ORIGIN OF ORE-FORMING FLUIDS OF THE XINQIAO Cu-Au DEPOSIT IN THE TONGLING MINERAL DISTRICT,ANHUI:EVIDENCE FROM He AND Ar ISOTOPES |
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| WANG Yan-bin,ZENG Pu-sheng,LI Yan-he,MENG Yi-feng,YANG Zhu-sen,TIAN Shi-hong.ORIGIN OF ORE-FORMING FLUIDS OF THE XINQIAO Cu-Au DEPOSIT IN THE TONGLING MINERAL DISTRICT,ANHUI:EVIDENCE FROM He AND Ar ISOTOPES[J].Geoscience——Journal of Graduate School,China University of Geosciences,2004,18(4):524-528. |
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| Authors: | WANG Yan-bin ZENG Pu-sheng LI Yan-he MENG Yi-feng YANG Zhu-sen TIAN Shi-hong |
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| Institution: | WANG Yan-bin~1,ZENG Pu-sheng~2,LI Yan-he~2,MENG Yi-feng~2,YANG Zhu-sen~2,TIAN Shi-hong~2 |
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| Abstract: | The ore genesis model of the Xinqiao Cu-Au deposit in Tongling of Auhui Province has long been in dispute, and the major debate focuses on whether the stratiform orebodies formed during the Yanshanian magmatic-hydrothermal event or they were products of carbonferious syn-sedimentary exhalative-hydrothermal event. The paper presents helium isotope data from fluid inclusions of five pyrites. The pyrites were collected from the stratiform orebodies in the deposit, and their ()~3He/()~4He ratios are significantly higher than 1, range from 1.02 to 1.22Ra, which indicateds a mantle component in the responsible hydrothermal fluids. It is suggested that the ore-forming fluids were a mixture of deep circulating seawater and a mantle-derived fluids, which are similar to many of those modern submarine hydrothermal fluids.The data provide a new evidence that favour the submarine exhalative-hydrothermal origin for the stratiform mineralization in Xinqiao Cu-Au deposit. |
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| Keywords: | He and Ar isotopes crustal fluid mantle fluid Xinqiao Cu-Au deposit Tongling Anhui |
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