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；

The alkali-syenites are of mantle-crust mixing type. The genesis of the rocks is associated with the orogenesis within the plate;

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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。

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.

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矾山岩体为一偏碱性超镁铁岩-正长岩杂岩体，其中蕴藏着中国北方最大的岩浆型磷灰石矿床。

Fanshan intrusive body is a complex body of meta-alkaline ultramafic rock-syenite. It hosts the biggest magmatic apatite deposit in north China.

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