火山旋回是指火山活动强弱交替发展的变化过程。对一座火山而言,总有发生、发展和消亡的过程,而它总是遵循开始喷发—活动加强—逐渐减弱—停息的规律。对全球火山活动来看,也确有这种规律。但其原因,还不清楚,是个正在探讨的问题。
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.
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