| 四川丹巴伟晶岩型白云母矿床的成矿时代及构造意义 |
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| 引用本文：李建康，王登红，付小方.2006.Metallogenic epoch and tectonic implications of Danba pegmatite type muscovite deposit in Sichuan Province, China [J].Mineral Deposits,25(1):95~100 |
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| 基金项目:国家自然科学基金青年基金(40202012)、国家科技攻关计划课题(2003BA612A_01) 、中国地质调查局国土资源大调查项目(200420190004)和国家自然科学基金(40173021，405 73033) |
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| 中文摘要:四川丹巴地区是中国最重要的白云母产地之一，所产白云母以质量好 、晶体大而闻名于世，是40Ar_39Ar测年的理想对象。文章通过野外调查和同 位素年代学研究，获得该区二道桥和李家工地伟晶岩脉内白云母的40Ar_3 9Ar法坪年龄，分别为（125.01±0.58） Ma和（114.68±0.32） Ma，属燕山中晚期产 物。丹巴伟晶岩脉的形成与区域地壳活动构成构造→岩浆→变质→伟晶岩脉的旋回，形成于 喜马拉雅运动开始之前。因此，丹巴白云母矿化伟晶岩脉是地壳活动相对宁静期的产物，与 世界上一些重要伟晶岩型矿床的成矿规律一致。 |
| 中文关键词:地质学 40Ar-39Ar定年 白云母 伟晶岩型矿床 松潘 -甘孜造山带 丹巴 |
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| Metallogenic epoch and tectonic implications of Danba pegmatite type muscovite deposit in Sichuan Province, China |
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| Abstract:As one of the most important muscovite_producing areas in China, Danba is famous for its good quality and large crystal muscovite. The muscovite crystal there i s an ideal object for 40A-39Ar dating. Based on geological surv ey and isotope chronology, the authors obtained 40Ar-39Ar platea u ages of (125.01±0.58) Ma and (114.68±0.32) Ma for Erdaoqiao and Lijiagongdi pegmatite dikes respectively, indicating that the pegmatite dikes in Danba are p roducts of middle and late Yanshanian period. The pegmatite dikes and regional c rustal movement constitute a circle of tectonic activity→magmatism→metamorphis m→pegmatite formation, and the pegmatite dikes were formed before the Himalayan movement. Thus, the pegmatite type muscovite deposit must have been formed in a stable period of crustal movement, and hence its metallogenic regularity is con sistent with that of some important pegmatite type deposits in the world. |
| keywords:geology, 40Ar-39Ar dating, muscovite, pegmat ite type deposit, Songpan_Ganzi orogenic zone, Danba |
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