Alkuainejakaumaa
Alkuainejakaumaa is a concept used in geochemistry, cosmochemistry, and planetary science to describe the distribution of chemical elements and their isotopes within a defined reservoir or system. The term combines alkuaine (element) and jakauma (distribution) in Finnish, reflecting its etymology. An alkuainejakaumaa covers both the relative abundances of elements by weight or mole fraction and the isotopic composition, and it can be specified for global, regional, or local contexts.
Data are obtained through laboratory measurements such as mass spectrometry, inductively coupled plasma techniques, and X-ray
In practice, the Earth's crust shows a characteristic order of abundance with oxygen, silicon, aluminum, iron,
Related topics include the overall abundance of the chemical elements, cosmochemistry, and isotopic geology.