Isotopic Constraints on Earth System Processes. Группа авторов. Читать онлайн. Newlib. NEWLIB.NET

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of the mole fraction of MgO and SiO2 as a function of temperature in glass recovered from two Soret experiments (SRT4 and SRT8) from Richter et al."/>

      Figure taken from Richter et al. (2008).

Schematic illustration of thermal fractionation of isotopes of the listed elements in molten basalt in terms of the parameter ohm defined as per mil per one atomic mass unit difference of the isotopes per 100°C.

      The question addressed in this section is whether the measurably large kinetic isotopic fractionations that were found in silicate melts also arise during diffusion in igneous minerals. Many of the laboratory experiments and natural examples focused on lithium because of its special attributes of large isotopic mass ratio and extremely fast diffusion, which makes it a potentially unique constraint on thermal histories on geologically very short time scales. Experiments and field examples of isotope fractionation during Fe‐Mg interdiffusion in olivine are also discussed.

      1.5.1. Experiments documenting Lithium Isotopic Fractionation by Diffusion in Pyroxene

Schematic illustration of diagram showing the experimental design used to diffused lithium from a Li-rich powder (spodumene in this figure) into an augite grain.