| 矿化期同位素年龄测定的样品挑选及元素分离技术的研究 |
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| 引用本文： | 叶素芝,张振海,张景鑫.矿化期同位素年龄测定的样品挑选及元素分离技术的研究[J].地质与资源,1993,2(1):70-76. |
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| 作者姓名： | 叶素芝 张振海 张景鑫 |
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| 作者单位： | 地质力学研究所 |
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| 摘 要： | 本文以胶东等地同一矿化期不同阶段的金矿进行系统Rb-Sr法同位素年龄测定为例，确认矿化期同位素年龄测定中挑选合格样品必须满足下列条件：含有母体87Rb、子体87Sr；其中Rb、Sr的含量自地质体形成至今保持不增不减，即始终处于"封闭体系"。用同期金矿化不同矿化阶段的蚀变带岩石或矿物做等时线即可得到不同矿化阶段的年龄。在元素分离技术方面（Rb、Sr分离）：试样用氢氟酸和高氯酸分解后以盐酸提取，经200-400目强酸性阳离子交换树脂进行交换分离，后由质谱测定。
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| 关 键 词： | 同位素年龄 样品挑选 分离技术 胶东地区 金矿 |
| 收稿时间： | 1992-04-25 |
STUDY ON SAMPLE SELECTION AND ELEMENT SEPARATION FOR ISOTOPIC DATING OF MINERALI ZATION |
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| Ye Suzhi Zhang Zhenghai Zhang Jinxin.STUDY ON SAMPLE SELECTION AND ELEMENT SEPARATION FOR ISOTOPIC DATING OF MINERALI ZATION[J].Geology and Resources,1993,2(1):70-76. |
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| Authors: | Ye Suzhi Zhang Zhenghai Zhang Jinxin |
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| Institution: | Institute of GeomecHanics |
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| Abstract: | It is important to choose available samples and to separate elements for isotopic dating of mineralization in laboratory besides geological survey in field. But it has been paid less at-tention to and has led to produce some mistake results of tests and measurements in laborato-ry and is responsible for the confused knowledge on metallogenetic age.
Our idea on the problems mentioned above will be given in the paper . The criterions of sample selection include that samples must be collected from same source of same metalloge-netic stage and Rb and Sr in samples must be in close system as well as the content of Rb and Sr must be heterogeneous.
We should exactly determine the samples containing Rb and Sr according to their geo-chemical and mineral features and investigation of features and stages of wall rock alterations in order to choose the samples which are suitable for Rb-Sr isochron method. In addititon, we must dialecticall. research and deal with the so-called Rb -Sr close system, that is to say, the defferent metallogenetic stages respectively represented by different sub -zones of wall rock alteration can be determined by Rb -Sr isochron method if each sub -zone is con-sidered as a single close system. The main metallogenetic stage can be dated by Rb - Sr isochron method if all of the sub -zones are considered as a whole large close system.
The technique of the separation and test and measurement of elements in laboratory meets the requirements in low background, high sens'itivity and high precision. |
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| Keywords: | Isotopic dating sample selection separation technique eastern Shan-dong gold deposit |
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