盆地形成后期火山作用微弱。

In the late period of basin formation volcanism is weak.

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他们比较了取自火山爆发期次的喷发早期的火山灰和取自典型火山喷发的喷发后期的火山灰。

They compared ash that was ejected in the early, explosive phase of the eruption with ash from a later, more typical eruption of the volcano.

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断裂发育带和后期反转区内的火山岩有利储集相带，是寻找深层天然气和无机气的有利场所。

Volcanic rock reservoir in fault developed belt and its latter reverse area is favorite site for finding deep gas and inorganic gas.

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