The chondritic uniform reservoir (CHUR) is a reference model used in isotope geochemistry to represent the average isotopic composition of chondritic meteorites, which are believed to reflect the primordial materials that formed the solar system. This model provides a baseline for understanding the isotopic ratios of elements such as neodymium and hafnium in various geological and extraterrestrial samples, facilitating comparisons between their isotopic signatures and those of chondrites.
congrats on reading the definition of chondritic uniform reservoir (chur). now let's actually learn it.