Abstract Although high-Mg andesites (HMA) have attracted increasing attention due to their unique geochemical composition and important geological significance, there is no consensus on petrogenesis. The present study indicates that the subducting terrigenous sediment-derived hydrous melts were incorporated into mantle source of Paleozoic HMA in northwestern Tianshan, western China. These are c...

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 enclav...

The Rooiberg Group is a 6-km-thick sequence of mostly volcanic rocks, which represent the first phase of magmatic activity associated with the Bushveld Complex. These strata include, in ascending stratigraphic order, the Dullstroom, Damwal, Kwaggasnek, and Schrikkloof Formations. Units of the lower Dullstroom Formation range from basalts to andesites and comprise two compositional suites: high ...