龙游沐尘岩体中岩石包体的特征及成因

浙江龙游沐尘晚侏罗世石英二长岩体中包裹了大量暗色微细粒二长闪长质—辉长闪长质岩石包体，它们大小不一，形态各异，分布不均匀，以微细粒结构、具冷凝边构造并发育环斑长石为特征。应用岩浆动力学理论和岩相学、岩石地球化学研究表明，该岩体中的岩石包体是在层状岩浆房中不同成分岩浆大规模对流、不均一混合机制驱动下形成的，在成因类型上属淬冷包体。

FEATURES AND GENESIS OF THE ROCK INCLUSIONS IN THE ROCK BODIES AT MUCHEN, LONGYOU COUNTY

There are large amount of dard - colored and fine - grained monzedioritic - gabbredioriticrock inclusions found in the lower Jurassic quartz monzonite theies at Muchen, Longtou countyof Zhejiang province. These inclusions occur in various sizes, different shapes and inhomogeneosdistriutions, and are characterized by their fine-grained texture, chilled border structure and developed rapakivi feldspar. Studies with magmatic dynamics, petrography and lithogeochemistry,the rocks in the rock body were formed by the magma of various compositions, which were convected in a large scale and wre driven by and inheqeneous mixed mechanism in the beddednagma chamber. So, they are chilled inclusions in genesis.