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- W2075665301 abstract "Abstract The concentration of elements in whole rocks and maps of their distribution in petrographic thin sections were determined using ion beam microprobe analysis. Lithium and B contents in rocks and minerals are measured using the 7Li(p,α)4He and 11B(p,α)8Be reactions. X-rays are simultaneously detected for elements heavier than Na, including Cl, to corroborate microscopic mineral identification. The ion beam analysis data are integrated with observations under the petrographic and scanning electron microscopes, as well as analysis using X-ray fluorescence and the electron microprobe. Lithium, B and Cl can be used to assess volcanic and hydrothermal processes. In a study of 62 samples, Li, B and Cl increase proportionally with increasing silica content in fresh volcanic rocks from the Taupo Volcanic Zone in New Zealand. The median values for Li, B and Cl in rhyolites (SiO2%=70–76%) are 35, 20 and 800 ppm (wt), respectively, and 19, 11 and 340 ppm (wt), respectively, for andesites (SiO2=56–62%). Boron and Cl preferentially partition into the glassy matrix of rhyolite and andesite. In rhyolites, Li occurs mainly in minerals such as hornblende and biotite but resides in the glassy matrix of andesites. During hydrothermal alteration of volcanic rocks, Cl always partitions into hydrothermal solutions while Li and B are preferentially redistributed in the rock. As hydrothermal alteration proceeds, Cl in the rock decreases and B and Li increase proportionally, depending on the type of mineralization present and the temperature of alteration." @default.
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- W2075665301 date "1999-09-01" @default.
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- W2075665301 title "Lithium and boron distributions in geological samples" @default.
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- W2075665301 doi "https://doi.org/10.1016/s0168-583x(99)00333-x" @default.
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