| 川西北雪宝顶钨锡铍矿床的成矿年代及其构造示踪意义 |
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| 引用本文：.2007.Metallogenic epoch of Xubaoding W-Sn-Be deposit in northwest Sichuan and its tectonic tracing significance[J].Mineral Deposits,26(5):557~562 |
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| 基金项目:国家自然科学基金项目“我国西南主要伟晶岩对大陆演化的示踪”(40202012)、国家科技支撑项目“我国西部重要成矿区带矿产资源潜力评估”(2006BAB01A01)及地质调查项目“全国重要矿产和区域成矿规律研究”(1212010733803)和“中国成矿体系综合研究”(121010535804) |
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| 中文摘要:研究表明，川西北雪宝顶矿床的白云母 40Ar/39Ar坪年龄为（189。9±1.8）Ma，说明雪宝顶矿床形成于印支晚期—燕山早期，是三叠纪华北板块与扬子板块碰撞的产物。文章通过雪宝顶矿床与甲基卡、可尔因和丹巴等伟晶岩型矿床的时空位置对比，并依据伟晶岩对大陆活动的示踪作用，推测中生代松潘_甘孜造山带的演化过程为：华北陆块、羌塘_昌都陆块分别与扬子陆块碰撞后，构造应力自北向南、自西向东逐步向松潘_甘孜地块的中心传递，雪宝顶、甲基卡、可尔因地区相继进入相对稳定发展阶段，构造应力最后在丹巴地区汇聚，形成丹巴白云母矿床。 |
| 中文关键词:40Ar/39Ar定年 伟晶岩 成矿年代 雪宝顶 |
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| Metallogenic epoch of Xubaoding W-Sn-Be deposit in northwest Sichuan and its tectonic tracing significance |
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| Abstract:The Xuebaoding W_Sn_Be deposit is located in the Motianling tectonic zone of Songpan_Ganzi orogenic belt. The muscovites dated were sampled from scheelite veins. The 40Ar/39Ar plateau age of muscovites is (189.9±1.8) Ma, which shows that the Xuebaoding deposit was formed in Late Indosinian and Early Yanshanian periods. Thus, the Xuebaoding deposit and some gold deposits in the Qinling orogenic belt might have resulted from the collision of the North China Block and the Yangtze Block. In Songpan_Ganzi orogenic belt, besides the Xuebaoding deposit, there exist some pegmatite type deposits, such as the Jiajika rare metal deposit, the Ke'eryin rare metal deposit and the Danba muscovite deposit. On such a basis, the evolution of the Songpan_Ganzi orogenic belt in Mesozoic can be described as follows: in the late stage of Indosinian epoch, the North China Block and the Qiangtang_Changdu Block collided with the Yangtze Block respectively, and tectonic stress was transferred from border to interior gradually in the NS and WE directions. Under such a tectonic background, Xuebaoding area, Jiajika area, Ke'eryin area, and Danba area entered into the phase of stabilization one after another and, finally, the stress was converged in Danba area. |
| keywords:geochemistry, 40Ar/39Ar method of dating, pegmatite, metallogenic epoch,Xuebaoding |
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