晚中生代火山岩系包括4个火山旋回；
The late Mesozoic volcanic series includes 4 volcanic cycles.
纵向上火山岩主要发育在深部地层，火山岩的纵向分布反映了火山活动具有多期次、多旋回、间歇性强的特点。
Volcanic rock develops mainly in deep formation, the distribution shows that volcanic rock has the characteristics of multi-stages and multi-times and multi-cycles.
火山岩与碎屑岩共生，构成沉积—喷发韵律或沉积—喷发旋回。
Volcanic rocks compose with clastic rocks together, form sedimentary-eruption rhythm or cycle.
根据一般规律，火山的喷发作用从强到弱，最后到沉积，组成一个火山喷发—沉积旋回。
According to general rule, volcano eruption function from strong to weak, finally arrives the deposition, composes a volcanic eruption - depositional cycle.
火山岩系列和成因类型的系统变化，反映了多旋回壳幔物质迁移特证。
The systematic changes of the igneous rock series and the genesis types have reflected polycyclic transference features of the crust and mantle materials.
火山沉积型矿床就位于火山喷发旋回顶部；
Volcanogenic—sedimentary ore deposits are situated at the top of volcanic eruption cycle;
研究表明 ，相山火山盆地火山活动划分为两个旋回 ，其就位受制于区域深断裂的走滑拉分作用。
The study shows that volcanic activity in Xiangshan volcanic basin may be divided into two cycles, and its emplacement is controlled by strike slip pull apart process originated from the deep regiona.
研究表明 ，相山火山盆地火山活动划分为两个旋回 ，其就位受制于区域深断裂的走滑拉分作用。
The study shows that volcanic activity in Xiangshan volcanic basin may be divided into two cycles, and its emplacement is controlled by strike slip pull apart process originated from the deep regiona.
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