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小草湖超单元是北山地区最晚一期的花岗侵入岩体,从早到晚依次可划分为花岗闪长岩单元,斑状二长花岗岩单元,黑云母二长花岗岩单元,含白云母二长花岗岩单元共4个单元。侵入于石炭纪扫子山组和华力西中晚期四顶黑山序列及印支早期马鞍山北超单元中,形成时代为晚三叠纪,属印支晚期花岗质侵入岩体。各单元间为脉动型侵入接触关系。岩石化学成分及地球化学特征显示具“S”型花岗岩的特征,形成于板块同碰撞期到碰撞后期的造山环境。
The Xiaocaohu unit is the latest granitic intrusive rock in the Beishan area. From early to late, it can be divided into granodiorite unit, macular porphyrite unit, biotite monzogranite unit, mica Two long granite unit a total of 4 units. Intrusion into the Carboniferous Swatches and the middle-late Aleutian four Montenegro sequences and the early Indosinian Ma’anshanbei ultra-unit, the formation of the age of the Late Triassic, is a late Indosinian granitic intrusive rock. Between the units for the pulsating invasion contact. The chemical composition and geochemical characteristics of rocks show the characteristics of “S” type granites. They are formed in the orogenic environments of the plate during the collision to post-collision.