苏北盆地火成岩发育与构造演化的关系

Relationship Between Volcanic Rocks and Structural Evolution in Subei Basin

苏北盆地作为中国东部中、新生代的张性盆地之一,其断裂构造发育,岩浆活动频繁,新生代以来火成岩多为基性喷发岩和浅成侵入岩,具有时代越新,越偏碱性的特点,说明了岩浆源较深、拉张作用导致的深大断裂活动与岩浆岩关系密切。岩浆活动是板块构造运动的产物,是区域构造运动的表现形式之一,通过对火成岩特征和演化的分析,可以研究构造运动的强弱和对构造圈闭的影响。

As one of the Mesozoic-Cenozoic extensional basins in East China, the Subei Basin has well-developed fractures and frequent magmatic activity. The volcanic rocks formed since Cenozoic are mostly basic effusive ocks and hypabassal intrusive rocks. The newer the rocks, the more alkaline, which indicates the deep magmatic hearth and a close relationship between extension-formed discordogenic faults and magmatic rocks. The magmatic activity is caused by plate movement and is a form of regional tectonic movement. Based on analysis on the characteristics and evolution of the igneous rocks, the intensity of tectonic movement and its influence on structural traps can be revealed.