Boninite is an extrusive rock high in both magnesium and silica, thought to be usually formed in fore-arc environments, typically during the early stages of subduction. The rock is named for its occurrence in the Izu-Bonin arc south of Japan. It is characterized by extreme depletion in incompatible trace elements that are not fluid mobile (e.g., the heavy rare-earth elements plus Nb, Ta, Hf) but variable enrichment in the fluid mobile elements (e.g., Rb, Ba, K). They are found al… WebFeb 6, 2013 · 用单个词语翻译起来确实混乱,用韦氏的原句可能更容易理解:. Dynamics: a branch of mechanics that deals with forces and their relation primarily to the motion but sometimes also to the equilibrium of bodies. kinematics: a branch of dynamics that deals with aspects of motion apart from considerations of mass and force ...
Boninite - Wikipedia
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http://fanyi.youdao.com/ WebSep 8, 2024 · The boninitic protoliths of the blueschists record intra-oceanic subduction initiation at ca. 492–488 Ma in the eastern North Qilian arc/forearc–backarc system, whereas peak blueschist facies ... flat warts cure