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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 temperature ranging from 580 ° C to 180 ° C and the 1-10. 5 → 6. 9 → 4 → 30-48 → 16 -22 → 2 -10 in wt% NaCl) The hydroxyl-melt inclusions are considered as evidence of magma-hydrothermal transition.