Yemajie-Mazongshan structral belt 基本例句 火山岩 The Xiangshan orefield,located at the western margin of the Mesozoic continental volcanic belt in South China, is a typical representative of volcanic type uranium deposit inChina.位于华南中生代陆相火山岩带西缘的相山矿田是我国火山岩型铀矿床的典型代表。