Re-assessment of the effect of fractional crystallization on Mo isotopes: Constraints from I-type granitoids and their enclosed mafic magmatic enclaves

In recent years, considerable progress has been made on the study of Mo isotopes in high-temperature geological processes. However, it is still controversial whether isotope fractionation occurs during magmatic differentiation. Here we reassess effect magma differentiation using published data conjunction with our new analysis well-characterized I-type granitoids and their enclosed mafic enclaves (MMEs) from two plutons North Qilian Orogen. The MMEs each pluton, representing earlier cumulates greater modal proportions amphibole biotite, show similar elemental isotopic compositions to host granitoids. absence covariation Dy/Dy*, Fe2O3 K/Rb both further indicates that fractional crystallization amphibole, biotite Fe3+-rich minerals does not fractionate these On basis re-assessment newly obtained data, find there no clear evidence for igneous rock. Instead, samples correlate positively Sr Rb/La ratios, negatively Nd Ce/Pb indicating clearly source compositional variation controls