摘要
花岗岩的形成与原岩成分及热源有关，且受流体的影响。形成机制主要有俯冲作用、大陆地壳的增厚、板底垫托、拆沉作用、板块破碎、地幔柱、减压熔融作用、助熔作用等。在变形、浮力、重力等作用下，熔体从母岩中分离，分离受粘度、流体、变形、渗透性等因素的影响。花岗质岩浆的侵位机制虽然较多，但主要是剪切带及断裂为其提供了上升。
The generation of granite is related to the source compositions and heat sources,and influenced by the fluid.The mechanisms of granitic melting include subduction,crustal thickening followed by erosional exhumation or extensional thinning,mafic magma underplating delamination,slab break off, mantle plume,decompression melting,fluxing, etc. Under the deviatoric stresses and the effect of a few factors,such as viscosity,fluid,deformation,percolation,the melt segregates from the source region, and ascends and emplaces along the shear zones and fractures.
出处
《地质科技情报》
CAS
CSCD
北大核心
1996年第3期19-25,共7页
Geological Science and Technology Information
