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河北平山深熔伟晶岩锆石成因及SHRIMP U-Pb年龄 被引量:14

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摘要 深熔伟晶岩中的锆石具有典型的岩浆锆石的形态和结构 ,但却具有较低的Th/U比值 ,是非常特殊的 ,研究表明其为深熔作用所形成 .进而说明并不是所有的具有自形柱状和密集振荡环带 /韵律的锆石都是严格意义上的岩浆锆石 .两样品锆石的SHRIMPU Pb年龄表明伟晶岩的结晶年龄在 1.87~ 1.89Ga之间 ,大致代表了母岩深熔的时间 ,其核部残留的锆石年龄在 2 .5Ga左右 .伟晶岩形成于张性环境的浅部层次 ,表明陆 陆碰撞的时代可能早于 1.9Ga .
出处 《自然科学进展》 北大核心 2004年第7期774-781,共8页
基金 中国地质调查资助项目 (编号 1 9991 30 0 0 0 0 3)
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