THE DYNAMIC BACKGROUND OF MESOZOIC VOLCANIC ACTIVITY IN NORTHERN PART OF DAXING' ANLING MOUNTAINS
-
摘要: 对大兴安岭北段中生代火山岩新的岩石化学、微量元素、构造等方面的分析表明,该地区中生代火山岩形成于明显的挤压环境.再结合区域构造、区域岩浆作用、稳定同位素、古地磁特征等的分析,得出以下认识:该区中生代火山岩来源较深,具幔源特征;岩浆总体形成在挤压的环境中,是"减压"-"剪切"作用的产物,而不是裂谷环境中的产物,从而使得岩浆在演化过程中混入了大量的壳源物质Abstract: The Mesozoic volcanic activity in northern Daxing'anling Mts.(NDM) is very violent,in which a lot of geologists are interested The volcanic rocks,formed mainly in Late Jurassic to Early Cretaceous(150~100 Ma),are divided into the Tamulangou formation(J3t),Jixiangfeng formation(J3j),Shangkuli formation(K1s) and Yilikede formation(K1y).
计量
- 文章访问数: 229
- PDF下载数: 67
- 施引文献: 0