Deciphering deep-seated, highly fractionated, and reduced granitic magma systems associated with world-class scheelite skarn ores: A case study of the Zhuxi deposit, South China

•The Zhuxi scheelite-bearing dikes formed coevally (∼l50 Ma) with the causative pluton.•The scheelite-bearing dikes represent the products of highly fractionated melts.•The scheelite-bearing dikes should serve as an important prospecting criterion.