【摘要】 利用x荧光定量光谱分析了胶莱盆地东南缘中生代青山组火山岩系18个样品的岩石化学和微量元素含量。利用岩石化学判别并结合邻区的构造地质背景,推断它们形成于中生代晚期陆间裂谷构造背景下的火山活动,是陆壳下部及上地幔部分熔融的产物,并阐述了中生代伸展构造在本区的发生和发展。更多还原

【Abstract】 Petrochemical composition and trace elements content of 18 samples of volcanic rocks from the Qingshan group of the Mesozoic era at the southeastern fringe of the Jiaolai depression were analysed by X -ray fluorecence ration spectrum analysis. With the tectonic background of this district, we infer that they were formed by volcanic actions on the rift tectonic background between continental crusts at the late Mesozoic era and were the partly melting of the under continental curst, and deduce the occurrence and development of the spreading structure at the Mesozoic era in this district.更多还原