摘要
鄂东南燕山期小岩体(群)有137处,主要分布在两大层间顺层滑脱拆离带中和毛铺—两剑桥断裂及其附近。小岩体规模小,埋藏浅,形态多为筒状、似直立柱体、蘑菇状、脉状、岩株状、岩墙状。小岩体产状总体倾向南、南东,倾角30°以上。鄂东南小岩体主要为中酸性花岗岩类,侵入期次分为两期七次。岩浆演化从早到晚的趋势为:闪长岩、石英闪长岩、石英二长闪长玢岩、花岗闪长斑岩、花岗斑岩、石英斑岩。部分小岩体与鄂东南六大岩体一样是杂岩体,是岩浆多期次演化的产物。小岩体岩浆来源于深部,与太平洋板块向欧亚板块俯冲作用有关。
Small intrusions are distributed mainly in detachment structure zone between two layers, Maopu-Liangjianqiao fault and its neighbourhood in phase of Yanshan in Southeast Hubei. Small intrusions are small size, shallow buried in the form of cylinder-shape, vein, mushroom-shape, stock and dike, the attitude of small intrusions in general tend to south and product of multi-stage magmatic evolution ,just hke six types of rock mass in Southeast Hubei. Magma of small intrusions originate in deep, relevant to the subduction of Pacific-oceanic plate to eurasian plate.
出处
《资源环境与工程》
2009年第4期390-395,共6页
Resources Environment & Engineering
关键词
小岩体
基本特征
鄂东南
small intrusions
basic characteristics
southeast Hubei
