西准噶尔东部碱性花岗岩体侵位机理的岩浆动力学初步探讨  

PRIMARY MAGMA DYNAMIC INVESTIGATIONS ON THE EMPLACEMENT MECHANISM OF ALKALI GRANITOIDS IN THE EASTERN PART OF WESTERN JUNGGAR, XINJIANG, CHINA

作　　者：杨富贵[1] 王中刚[1] 侯鸿泉[1] 洪文兴[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室,贵阳550002 [2]中国科学院广州地球化学研究所,广州510640

出　　处：《矿物学报》1998年第4期411-416,共6页Acta Mineralogica Sinica

基　　金：国家攀登计划预选项目!95-预-39;"305"项目

摘　　要：运用岩浆动力学原理探讨了西准噶尔东部碱性花岗岩浆侵位的驱动力、上升通道、通道最小临界宽度和定位过程。指出：碱性花岗岩体是由其岩浆主要在区域性挤压应力作用下，沿深大断裂以最小临界宽度1．33～301m的脉状上升，并在地壳浅部发生气球膨胀和岩墙扩张．定位于与区内深大断裂有关的次级张性裂隙发育部位后形成的。Based on the analysis of regional stresses, capacity of magma ascending, minimum criti-cal width of the magma ascending channels, and processes of magma emplacement, it is shown that the alkali granitic bodies were formed as a result of the alkali granitic magma ascending in dikes with the minimum critical width of the magma ascending channels about 1. 33-3. 01 m, em-placed in the shallow crust by way of ballooning or dike expanding, and located in the regions where tensile sub-fractures are developed, which are related to the great-deep faults.

关 键 词：碱性花岗岩 侵位机制 花岗岩 岩浆动力学 

分 类 号：P588.121[天文地球—岩石学] P588.11[天文地球—地质学]