摘要
The tin-bearing topaz-quartz porphyry in the Yanbin area is subvolcanic in origin, derived from granitic residual magma through strong crystallization differentiation. The rock contains various types of inclusions (hydroxyl-melt, vapor-rich, halite-bearing multiphase, and liquid-rich), which permits us to trace the evolutionary path of the fluid. It is suggested that immiscibility took place in a pulsating manner between melts and fluids during the rock-forming process with the homogenization temperatures ranging from 580℃ to 180℃ and the salinities varying from low through high to low (5. 1-10. 5→6. 9-21. 4→30-48→16 -22→2 -10 in wt% NaCl). The hydroxyl-melt inclusions are considered as evidence of magma-hydrothermal transition.
The tin-bearing topaz-quartz porphyry in the Yanbin area is subvolcanic in origin, derived from granitic residual magma through strong crystallization differentiation. The rock contains various types of inclusions (hydroxyl-melt, vapor-rich, halite-bearing multiphase, and liquid-rich), which permits us to trace the evolutionary path of the fluid. It is suggested that immiscibility took place in a pulsating manner between melts and fluids during the rock-forming process with the homogenization temperatures ranging from 580℃ to 180℃ and the salinities varying from low through high to low (5. 1-10. 5→6. 9-21. 4→30-48→16 -22→2 -10 in wt% NaCl). The hydroxyl-melt inclusions are considered as evidence of magma-hydrothermal transition.
