WebThose boninite rocks include many composed of 52 to 65 wt. % SiO2 with >8 wt. % MgO and <0.5 wt. % TiO 2 , consistent with the definition endorsed by the IUGS (Le Bas, 2000). Web利用岩石地球化学的方法,研究了羌塘地块南界班公湖-丁青断裂带中晚中生代火山岩.结果表明,研究区火山岩由拉斑系列大洋玄武岩(MORB)和钙碱性系列岛弧玄武岩(IAB)、玄武安山岩、安山岩、英安岩和流纹岩组成.拉斑系列的洋中脊玄武岩微量元素原始地幔的标准化配分型式,明显不同于N-MORB玄武岩,而 ...

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Webcontinuity翻译：连续性，持续性，连贯性, （电影、电视的）场景串联，节目串联，衔接。了解更多。 WebDefinition of boninite in the Definitions.net dictionary. Meaning of boninite. What does boninite mean? Information and translations of boninite in the most comprehensive … mahindra thar wallpaper 4k

Boninite: Mineral information, data and localities.

Web1.百度翻译. 老牌好用的翻译软件。. 百度翻译具备划词翻译、文本翻译、截图翻译、文档翻译等功能，每种功能支持翻译的语言不大一样，其中文本翻译支持的语言最多，有200+种语言。. 软件的文本翻译会自动识别输入语言，而且还能选择翻译领域，有通用领域 ... WebBoninite is a high magnesium mafic extrusive rock formed in back-arc environments, typically in seafloor spreading centres but also in terrestrial back-arc spreading centres. The rock is named for its occurrence in the Izu-Bonin arc south of Japan. Boninite is considered to be a primitive andesite derived from melting of metasomatised mantle.. Similar … WebYb–Os isotopic modeling of the high-Si boninite source indicates 18–30 wt% melting of the primitive upper mantle at 1.5–1.7 Ga, whereas the source mantle of the protoarc basalt, the residue of which became the source of the (ultra)low-Si boninite, experienced only 3.5–4.0 wt% melt depletion at 3.6–3.1 Ga, much earlier than the average ... oae hearing aids