N a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite 正长岩
The alkali-syenites are of mantle-crust mixing type. The genesis of the rocks is associated with the orogenesis within the plate;
本区碱性正长岩类属幔壳混源成因类型，其成因与板内造山作用有关；
Bengge syenites has been always regarded as the product of alkaline magma activity controlled by the strike-slip structures caused by collision between Yindia and Euroasia.
长期以来，甭哥正长岩体被认为是印度—欧亚板块碰撞引起的走滑剪切构造所控制的碱性岩浆活动的产物。
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