The cycles of magmatic activities may be divided into several types with different spatial and temporal scales firstly, which, further, may be correlated to the multi layered convection system of the Earth with different depths, and then the cycles is vested with a dynamic implication.
从地球历史的节律角度讨论岩浆活动旋回。
In the lower Ordovician Penglaiba Formation of Tarim basin occur thick strata of interbeded dolostone and limestone,which show a relatively constant petrologic rhythm in Tazhong19 well:three parts can be observed in every rhythm,the upper part is microlite limestone,middle part is dolostone,and lower part is siliceous granular limestone.
在塔里木盆地西部台地区奥陶系蓬莱坝组地层中,发育了厚层的白云岩与灰岩的互层段,其中塔中19井蓬莱坝组云灰互层段存在着相对固定的岩性旋回,每个旋回上段为泥晶灰岩,中段为粉晶云岩,下段为硅化砂屑灰岩。