Apex cherts 发现有沈积的顶燧石
control cherts X控制图
Devonian cherts 泥盆纪硅质岩
origin of cherts 火山成因
Late Devonian cherts 晚泥盆世硅质岩
pebbles of radiolarian cherts 放射虫硅质岩砾石
N a microcrystalline form of silica usually occurring as bands or layers of pebbles in sedimentary rock. Formula: SiO2. Varieties include flint, lyddite (Lydian stone) 燧石 (Also called hornstone)
The radiolarian cherts in the Wenbei region of Shaanxi Province are a formation of pelagic sediments formed within the North China Platform.
渭北奥陶系的放射虫燧石岩是在稳定的华北地台上形成的远洋沉积。
The geochemistry of the cherts reflects that the cherts coexisting with island-arc volcanic rocks all formed the background of continental margin basin.
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 rare earth elements reflect that these cherts formed in the deep-water basin far from continent where terrestrial material had no obvious effect to them.
但硅质岩稀土元素特征反映其受陆源影响不明显，为远离陆源的深水盆地沉积。
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