Abstract— The mean concentrations of volatiles, major, and trace elements are estimated in the magmatic melts of Kamchatka based on an our database that includes analyses of melt inclusions and quenched glasses of rocks for 75 elements (the database comprised 1 900 000 analyses as of late 2018). The determined concentrations are compared with analogous characteristics of melts from island arcs and active continental margins. The distribution of SiO 2 concentrations (more than 105 000 analyses) in natural magmatic melts from all geodynamic environments is obviously bimodal, with maxima at SiO 2 = 50–52 and 72–76 wt %. The paper presents binary diagrams that show the concentrations of major, volatile, trace elements, and REE and diagrams of the normalized patterns average concentrations of elements in the magmatic melts. The diagrams show distinguishing features of the melts of Kamchatka, for example, the elevated Ba/Nb ratios of Kamchatka mafic melts compared to those of melts in other zones, which may reflect a high content of subduction-related material during the derivation of the Kamchatka melts, with their Th deficit controlled by specifics of the fluid regime.

中文翻译：

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堪察加半岛岩浆熔体的成分和地球化学特征：来自熔体包裹体和岩石淬火玻璃的证据

摘要——基于我们的数据库估算了堪察加岩浆熔体中挥发物、主要和微量元素的平均浓度，该数据库包括对 75 种元素的熔体包裹体和岩石淬火玻璃的分析（该数据库包括截至 2017 年的 1 900 000 次分析）。 2018 年底）。确定的浓度与来自岛弧和活动大陆边缘的熔体的类似特征进行比较。来自所有地球动力学环境的天然岩浆熔体中 SiO 2 浓度的分布（超过 105 000 次分析）显然是双峰的，最大值在 SiO 2 = 50-52 和 72-76 wt%。该论文提供了显示主要元素、挥发性元素、微量元素和稀土元素浓度的二元图，以及岩浆熔体中元素平均浓度的归一化模式图。