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地质通报  2015 

西天山阿吾拉勒西段麻粒岩相片麻岩锆石CamecaU-Pb年龄及其地质意义

, PP. 1852-1862

Keywords: 伊犁地块,西天山,锆石CamecaU-Pb年龄,麻粒岩相片麻岩

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Abstract:

岩相学和岩石地球化学特征表明,西天山阿吾拉勒西段低压麻粒岩相片麻岩的原岩为杂砂岩,具有近源、快速沉积的特点。在稀土元素的球粒陨石标准化图解上,片麻岩具轻稀土元素陡倾、重稀土元素平坦的分布型式,并具明显的Eu负异常,Nb、Ta、Ti、Ba、P、Sr均相对亏损。片麻岩中Cameca离子探针锆石U-Pb年代学结果显示,上交点年龄为(1609±40)Ma,代表了原岩的岩浆结晶年龄;下交点年龄为(764±72)Ma,代表了引起Pb丢失的热事件的时代,可能代表麻粒岩相变质事件的年龄。该麻粒岩相片麻岩的产出表明伊犁地块可能具有中元古代的结晶基底,也表明伊犁地块经历了764Ma的热事件。该热事件可能是伊犁地块对全球Rodinia超大陆解体事件的响应。

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