根据矿物成分及其结构演变,将大别山榴辉岩的退变质过程分为三个阶段:贫流体阶段、弱流体阶段和富流体阶段。贫流体阶段发生于榴辉岩相环境中,其主要作用是柯石英-石英和文石- 方解石等同质多象转变、石榴子石和绿辉石等的重结晶,以及绿辉石中硬玉和钠长石的固溶体出溶等。弱流体阶段发生于榴辉岩相退变质的晚期,含水矿物闪石、绿帘石和云母,以及钠长石等低压矿物大量形成之前,其标志是蓝晶石变斑晶和金红石脉的形成,以及浸染状金红石的富集成矿。富流体阶段始于低级角闪岩相退变质环境,并可能一直持续到近地表处。该阶段以出现大量含水和挥发份的矿物(如闪石、绿帘石、多硅白云母、钠云母、黑云母、磷灰石和碳酸盐等)为特征。围绕石榴子石和绿辉石的闪石次变边、闪 Based on the mineral composition and its structural evolution, the degenerated process of the Eclogites in the Dabie Mountains is divided into three stages: the lean stage, the weak fluid stage and the fluid-rich stage. The lean fluid stage occurs in the eclogite facies, and its main functions are the isomorphous multi-transformations such as coesite-quartz and aragonite-calcite, the recrystallization of garnet and omphacite, and the pyroxene and sodium Stone solid solution and so on. The weak fluid stage occurs in the late metamorphic stage of eclogite. Prior to the massive formation of low-pressure minerals such as amphiboles, epidote and albite, as well as albite, the formation of kyanite porphyritic and rutile veins, And disseminated rutile enriched mineralization. The fluid-rich phase begins with the low-grade amphibolite facultative metamorphic environment and may continue to near-surface. This stage is characterized by the presence of a large number of water and volatile minerals such as amphiboles, epidote, polysilicosal, mica, biotite, apatite and carbonates. Around the garnet and omphacite amphibole sub-variable edge, flashing