其岩石化学及地球化学显示岛弧火山岩特征。
Its petrochemical characteristics show that the volcanics was formed in oceanic island tectonic environment.
北祁连山石灰沟地区发育一套完整的奥陶纪岛弧火山岩系。
The Middle Ordovician submarine spilite-alkaline volcanic rock association in the Shihuigou area in the Northern Qilian mountains was the product of island arc volcanism.
硅质岩的沉积地球化学研究表明，与岛弧火山岩共生的硅质岩为生物成因，形成于大陆边缘盆地的构造背景。
The geochemistry of the cherts reflects that the cherts coexisting with island-arc volcanic rocks all formed the background of continental margin basin.
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