Abstract

The paper summarizes data on germanium and gallium concentrations in natural magmatic melts as follows from analyses of mineral-hosted inclusions and quench glasses in volcanic rocks. Germanium concentrations in melts vary from 0.96 to 17.6 ppm (1472 determinations). The geometric mean germanium concentration in silicate melts is 1.56 ppm, which is quite close to the clarke value. Concentrations of gallium in magmatic melts vary from 0.47 to 495 ppm (8755 determinations). The geometric mean of gallium concentration in silicate melts is 19.0 ppm, which is also close to the clarke value. Germanium concentration in hydrothermal fluids ranges from 0.01 to 930 ppm (405 determinations), and the geometric mean value is 17.0 ppm. Concentrations of gallium in fluids vary from 0.02 to 320 ppm (441 determinations), with a geometric mean of 2.0 ppm. The possible reasons for the differences in germanium and gallium concentrations in natural melts and fluids are discussed.

中文翻译：

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天然熔体和流体中的锗和镓浓度：来自流体包裹体的证据

摘要

本文通过对火山岩中矿物包裹体和淬火玻璃的分析，总结了天然岩浆熔体中锗和镓浓度的数据。熔体中的锗浓度范围从0.96到17.6 ppm（测定1472）。硅酸盐熔体中锗的几何平均浓度为1.56 ppm，非常接近克拉克值。岩浆熔体中镓的浓度从0.47到495 ppm（8755测定）不等。硅酸盐熔体中镓浓度的几何平均值为19.0 ppm，这也接近克拉克值。水热流体中的锗浓度范围为0.01至930 ppm（405次测定），几何平均值为17.0 ppm。液体中镓的浓度从0.02到320 ppm（441测定）不等，几何平均值为2.0 ppm。