内蒙古狼山后山地区海相火山岩特征及找矿前景

内蒙古狼山后山地区为一转换拉伸盆地,其演化过程及伴随的火山活动可划分出4个阶段,分别为拉伸盆地初始演化阶段、盆地强烈拉伸阶段、裂谷晚期双峰式海相火山岩形成阶段和裂谷闭合岩浆侵入活动阶段.那仁宝力格～查干楚鲁海相火山岩的原岩分异较好,产出构造环境为大陆-大洋过渡的岛弧环境.海相火山岩的常量元素和微量元素特征表明,霍各乞地区矿床的物质来源与火山岩(绿片岩及角闪岩)关系密切,该海相火山岩系具有一定的成矿潜力.

CHARACTERISTICS OF OCEANIC VOLCANIC ROCKS IN HOUSHAN AREA OF LANGSHAN MOUNTAINS, INNERMONGOLIA

Houshan area of Langshan Mountains, Inner Mongolia, was a convergent tension basin. The basin was developed from original extension stage, basin strong tension stage, bimodal oceanic volcanic eruption in late rift valley, and magmatic intrusion during closing of rift valley. The initial rocks of Narenbaolige-chaganchulu oceanic volcanic rocks were well differentiated, occurring in island arc environment. The invariable elements and minor elements of oceanic volcanic rocks reflect the close relationship between greenstones and ore-forming materials in the Huogeqi area. The oceanic volcanic rock formation has mineralizing potential for prospecting.