Basic volcanic rocks occur in a relatively extensional environment. The magma comes from the depth with a depleted mantle nature.
其中，基性火山岩形成于走滑相对伸展环境，岩浆源自较深部，具亏损地幔性质；
The Sinian volcanics are typical bimodal volcanic rocks in Kuruktag area, which are consisted of acidic and basic volcanic rocks but with rare medium acidic one.
库鲁克·塔格震旦纪火山岩构成一个典型的双峰值火山岩系，主要由酸性火山岩与基性火山岩组成，缺少中酸性火山岩。
The coexistence of the two melts rich in fe and si in the previous studies of basic volcanic rocks reflects the magmatic immiscible process and records their product features.
而以往在基性火山岩中发现的富铁相和富硅相两种熔体的共存现象，反映了幔源岩浆的熔离过程，并记录了熔离产物的特征。
Montmorillonite forms when basic rocks such as volcanic ash in Marine basins are altered.
海相盆地中的基性岩石(如火山灰)经蚀变后形成蒙脱石。
On Heilongjiang basin volcanic rock mainly for basic, acidic lava, pyroclastic rocks, may divide 5 volcanic rock belts.
上黑龙江盆地火山岩主要为基性、中酸性的熔岩、火山碎屑岩，可划分5个火山岩带。
The volcanic rocks in the study area all belong to sub alkaline series including olivine basalt, andesite and dacite, from basic to intermediate, and to acid.
研究区内火山岩从基性—中性—中酸性都有出露，包括橄榄玄武岩、安山岩和英安岩，且都属于非碱性系列。
Volcanic rock reservoir involves basic and acidic volcanic rocks.
火山岩储集层有基性火山岩也有酸性火山岩。
There develops a suit of meta-spilite baschtaunite system volcanic rocks in the south of Lushan Mountain. Lithology combination reflects the regularity of magma evolution from basic to acid.
庐山南麓发育一套变 细碧-石英角 斑岩系火山 岩，岩性组合从早到晚反映了由基性到酸性的岩浆演化规律。
There develops a suit of meta-spilite baschtaunite system volcanic rocks in the south of Lushan Mountain. Lithology combination reflects the regularity of magma evolution from basic to acid.
庐山南麓发育一套变 细碧-石英角 斑岩系火山 岩，岩性组合从早到晚反映了由基性到酸性的岩浆演化规律。
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