大兴安岭中南段中生代火山岩特征及演化

Temporal and spatial evolution of the Mesozoic volcanism in mid southern Daxinganling Mountain

大兴安岭中南段中生代自晚三叠世至早白垩世火山活动不断，晚侏罗世达到高潮，形成了几套代表各自特点的火山岩组合，划分出晚三叠世、早—中侏罗世、晚侏罗世和早白垩世等４ 个火山喷发（沉积） 旋回。火山活动相伴随的侵入活动受伸展机制制约，构成了成对的火山侵入岩带。

Volcanism lasted from the late Triassic to early Cretaceous in the mid southern Daxinganling and reached its peak at the late Cretaceous.This gave rise to several series of volcanic associations that are representative of four volcanic eruption sedimentation cycles:the early Triassic,early mid Jurassic,late Jurassic and early Cretaceous.The volcanism and associated intrusion were controlled by extensional mechanism,resulting in the present paired volcanic intrusive belts.