Thyon volcanic rocks are classified as alkali basalts, with pyroxene megacrysts, and deep-seated mantle xenoliths such as augite and peridotite have been observed in some basaltic layers.
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- 火山岩主要为碱性玄武岩,部分玄武岩中可见橄榄岩类等深源岩石包体和普通辉石等矿物巨晶。