相山破火山口位于华南褶皱系的华夏褶皱带北西侧,发育于震旦系的基底变质岩之上,由于晚侏罗世强烈的火山活动,特别是最末一次剧烈而快速的大体积喷发,过渡岩浆室产生空腔而塌陷,次火山岩沿环状断裂侵入,形成了由酸性—中酸性的熔岩、火山碎屑 The Xiangshan caldera is located on the northwestern part of the Huaxia fold belt of the South China fold system and developed on the Sinian basement metamorphic rocks. Due to the intense volcanic activity of the Late Jurassic, especially the last violent and rapid large volume Eruptions and transitional magma chambers created cavities and collapsed, and sub-volcanic rocks intruded along the ring-shaped faults, resulting in the formation of acidic-intermediate acid lava, pyroclastic