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；
2
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.