安徽庐枞地区中生代火山岩区巴家滩火山穹窿的研究

巴家滩杂岩体位于庐枞中生代火山构造洼地的中心。地质填图，重、磁异常和卫片影象均显示出其为火山穹窿的特征。岩石、矿物地球化学的研究表明，辉石粗安岩与辉石二长岩同源，分别为火山穹窿的上部和根部。辉石二长岩形成于高温、超浅成的环境下，贫水、粘度较高的岩浆有利于火山穹窿的形成。本文根据地质资料的分析，揭示了巴家滩火山穹窿的演化历史。

THE BAJIATAN VOLCANIC DOME IN THE MESOZOIC VOLCANIC TERRAIN OF THE LUJIANG-ZHONGYANG AREA, ANHUI PROVINCE

The Bajiatan complex is located at the center of the Mesozoic Lujiang-Zhongyang volcano-tectonic depression. The feature of the volcanic dome is shown by geological mapping, gravitional and magnetic anomaly and landsat remote sensing photograpy. The study of petrology, mineralogy and geochemistry suggests that augite latite and augite monzonite are cognate, belonging to the upper and root parts of the volcanic dome respectively. Augite monzonite crystallized at high-temperature and over-hypabyssal conditions. The water-deficient, highly viscous magma was favourable to the formation of the volcanic dome. Study of geological data has revealed the evolutionary history of the Bajiatan volcanic dome.