volcanic-arc environment

Therefore the volcanic rocks in Chahe and Maomihe belong to the continental arc environment.

上述特征充分说明岔河、茂密河的火山岩属大陆弧构造环境。

Their structural environment is mainly volcanic arc.

其构造环境主要为火山弧地区。

They were formed in an island-arc environment of moderate maturity, and the volcanic rocks present in Dongshuixia area might have been formed in an intra-arc rift.

火山岩形成于具有中等成熟度的岛弧环境，其中发育于东水峡的火山岩可能形成于弧内裂谷环境。