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.
岛弧和洋中脊火山岩都明显来自地幔然而他们有不懂的组成。
Both island arc and mid-ocean ridge magmas apparently come from the mantle yet they have different compositions.
其原岩岩石类型有火山岩，陆缘碎屑沉积岩，火山、岛弧拉斑系列或钙堿系列火山岩、蛇绿岩等。
Their original rocks are volcanic rocks, epicontinental clastic sedimentary rocks, and ophiolite of volcanic and island arc tholeiitic series or calcium alkali series.
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。
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.
在晚古生代岛弧带、弧前海沟带、弧后盆地或陆缘活动带等构造环境下发育有不同的火山岩组合。
Under the tectonic backgrounds of island arc belt, fore - arc trench belt, back - arc basin, and epicontinental active belt of late Paleozoic, it has different volcanic rock characteristics.
变火山岩地球化学特征表明，它们生成的最有利的构造环境是岛弧模式；
The geochemical character of metavolcanics has shown that their most favourable tectonic environment was an arc-island model.
通常形成于弧后或岛弧环境下的同长英质火山岩有关的块状硫化物中的金含量较高。
The massive sulfides related to felsic volcanic rocks in the back-arc and island arc environments have higher content of gold. According to a vast amount of geo chemical research...
通常形成于弧后或岛弧环境下的同长英质火山岩有关的块状硫化物中的金含量较高。
The massive sulfides related to felsic volcanic rocks in the back-arc and island arc environments have higher content of gold. According to a vast amount of geo chemical research...
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