The Shahejie Formation of the 5th structure in Napu sag is buried deeply.
要南堡凹陷5号构造沙河街组地层埋藏深度较大,由火山
与沉积
构成地层骨架。
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Whereas those with lower silica content, like intermediate to mafic volcanic andesite and basalt, tend to make darker iron and magnesium-rich flour, which absorbs more light, making lakes that look greener, grayish, or duller blue, depending on concentration.
而二氧化硅含量较低
岩石,比如中性到
铁质
火山岩——安山岩
玄武岩,则会形成颜色更深、富含铁

岩粉,这类岩粉吸收更多光线,从而使湖泊看起来偏绿、偏灰,或是较为暗淡
蓝色,具体取决于岩粉
浓度。