They are formed in geodynamic tectonic surroundings of ancient island arc, usually oc-cured in the zone of ophiolitic formation and related with proto -plutonic granitoid rocks in genesis.

• 它们形成于古岛弧的地动力学构造环境,一般位于蛇绿岩建造带中,成因上与原地型深成花岗岩类岩体有关。