甘肃的混合岩及混合岩化作用初探  

PRELIMINARY STUDY OF THE MIGMATITE AND MIGMATIZATION IN GANSU PROVINCE

作　　者：梁明宏[1] 张伯祥[1] 梁国冰 丁仨平 

机构地区：[1]甘肃省地质调查院,甘肃兰州730000 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《甘肃地质》2017年第1期8-16,共9页Gansu Geology

基　　金：中国地质调查局综合研究项目<西北地区地质系列图件编制与综合研究-甘肃省区域地质志新编>(项目编码:12120113013500)

摘　　要：甘肃是中国西部造山带发育的省份之一,中—高级区域变质岩发育,有太古宙—早元古代中、高级区域变质岩系构成的稳定克拉通,有显生宙时期在古老结晶基底上发育起来的北山、祁连山、秦岭等古生代造山带,形成了复杂多样的混合岩、混合岩化岩石。根据混合岩化的发生、发展及地质环境可将混合岩化分为区域性混合岩化、边缘混合岩化、断裂带或构造带混合岩化。根据不同程度混合岩化程度可分为混合岩化的变质岩、混合岩、混合花岗岩。初步总结了区域混合岩、注入混合岩与构造混合岩的基本特征,对比了混合岩化岩石、混合岩和混合花岗岩特征及在甘肃的分布、岩石学变化,分析了混合岩—混合花岗质岩石演化特征,对甘肃混合岩及混合岩化研究存在的问题进行了探讨,提出前人将大片的具片麻状构造的花岗岩视为混合岩是一种认识上的误区,而仅仅按混合岩化程度进行的混合岩化分类具有较大的局限性。The complicated migmatites developed accompanied by craton composed of Archean-early Proterozoic middle-high grade metamorfie rocks and Palaeozoic orogeny of Beishan, Qilian and Qinling in Gansu Province. The migmatization was classified according to their geological setting into three groups： reginal migmation, marginal migmatization and fracture zone migmatization; also classified into migmatized rocks, migmatites, and migmatitie granitics according to their increasing degree of migmatization. The basic characteristics of the distributing and petrology of migmatite and migmatization were concluded in the article, and the migmatie-migmatitic granitics were analyzed. The authors discussed the problems in the studying of migmatite and migmatization in Gansu Province, supposed the mistake of regarding the granite with gneissic structure as the migmatite, especially pointed out the limitation of classification according to the degree of migmatization.

关 键 词：混合岩 混合岩化作用 混合岩化分类 甘肃 

分 类 号：P588.36[天文地球—岩石学]