摘要
洋滨含锡黄英斑岩是火山作用晚期形成的次火山岩。岩石地球化学特征表明，它由高度分异演化的花岗质残余岩浆形成．岩石中包裹体十分丰富，存在羟基化熔体包裹体，富气相包裹体、含NaCl子晶多相包裹体和富液相包裹体系列，表明成岩过程中，岩浆熔体与流体脉动式不混溶，以及流体经过了多阶段演化。包裹体温度和盐度显示．流体衍生和演化过程中，温度呈叠瓦式降低（变化范围580～180C），盐度（wt％NaCl）则由低到高再到低（依次为：5.1～10．5→6.9→21.4→30～48→16～22→2～10）。羟基化馆体包裹体是岩浆向热液转化的桥梁和证据。
The tin-bearing topaz-quartz porphyries in the Yangbin area are the subvolcanic rocksforrned in the late stage of volcanication. The petrological and geochemical characteristics of therocks suggest that they were formed from the granitic residual magma due to strong crystallizationdifferentiation. There are lots of various fluid inclusions in the topaz-quartz porphyries, such ashydroxyl melt inclusions , vapor-rich inclusions, halite-bearing muitiphase inclusions and liquid-rich inclusions, showing an evolutionary series of inclusions. It is suggested that during the rock-forming process, pulsating immisclbilities took place between melts and fluids, and fluid likely un-derwent several stages of evolution. The homogenization temperatures and salinities of fluid inclu--sions show that during the process of derivation and evolution of fluid, the temperature of fluid fellin imbrication way from 58O'C to 18O C, and the salinity changed from low through high to low(i. e., wt％NaCl: 5. L～ lO. 5→6.9～21. 4→3O～48→ 16～ 22 →2～ 1O). Hydroxyl melt inclusionsare regarded as bridges and evidence for the transformation of magma into hydrothermal solutions.
出处
《矿物学报》
CAS
CSCD
北大核心
1997年第2期126-134,共9页
Acta Mineralogica Sinica
基金
自然科学基金!49632080
49673183
博士点基金
南京大学成矿作用国家重点实验室资助
