| 广东高凤金矿形成时代的Rb-Sr、40Ar-39Ar年龄测定 |
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| 引用本文： | 李献华,桂训唐,程景平,阴国渠.广东高凤金矿形成时代的Rb-Sr、40Ar-39Ar年龄测定[J].矿床地质,1992,11(4):367-373. |
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| 作者姓名： | 李献华 桂训唐 程景平 阴国渠 |
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| 作者单位： | 中国科学院地球化学所分部 |
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| 基金项目： | 广东省自然科学基金资助项目 |
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| 摘 要： | 用含金石英脉流体包裹体Rb-Sr和40Ar-39Ar方法测定了广东高凤金矿的形成时代为印支期(215×106a)。两种方法的结果在误差范围内完全一致，两种测定方法相互验证，结果准确可靠。研究表明含金石英脉流体包裹体Rb-Sr和40Ar-39Ar年代方法对于解决石英脉型金矿的成矿时代具有很好的应用前景。
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| 关 键 词： | 金矿床 铷 锶 氩 同位素 年龄 |
Rb-Sr And 40ar-39ar Dating Of The Gaofeng Gold Deposit, Guangdong Province |
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| Abstract: | The precise age determination of various gold deposits is a problem which has not been thoroughly solved by geochronologists, and this is greatly attributed to the difficulty in finding rocks and minerals which were formed simultaneously with mineralization and are suitable for dating. Noticeable uncentainty generally exists in the dating of gold deposits with the traditional lead isotopic model ages of sulfides and age determination of altered minerals; the isotopic analytical technique of fluid inclusions developed in the past ten years, however, has opened up a new avenue for the study of formation ages of metallic deposits. The Gaofeng gold deposit in Lianmai Town, Huaiji County, Guandong Province consists mainly of coarse, medium and fine quartz veins containing pyrite and arsenopyrite, and quartz in ore veins might be roughly divided into three stages. In quartz, there are mainly primary gas-liquid inclusions and a few liquid inclusions with organic inclusions commonly seen. In this study, samples of auriferous quartz veins were pretreated by HCI, HN03 and ion-free water, then Rb-Sr analysis and 39Ar-40Ar analysis of fluid inclusions in quartz were conducted to date the gold deposit. Both methods gave a formation age of 215 x 106a, indicating the Indosinian period. The results of the two methods are coincident with each other within the limits of the experimental error, and mutual identification has proved the results of the two methods to be both precis'e and reliable. It is hence shown that Indosinian is also an important gold metallogenic period in western Guangdong. Indosinian gold mineralization is closely related to geotectonic evolution and magmatic activity of the same period. We hold that, although some technological details remain to be solved, the Rb-Sr and 39Ar-40Ar dating methods for fluid inclusions in auriferous quartz veins have brilliant prospects in determination of metallogenic ages of quartz vein type gold deposits. |
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