摘要
为探讨应力条件下地质体的变形规律及物质组分对变形的响应,在600℃和600MPa等应变速率条件下对中粒花岗岩进行了变形实验。实验结果显示,花岗岩在实验温压范围内表现出脆-韧性转化的特征,并显现一种共轭扇式的宏观变形结构。对遭受韧性剪切变形的长石、黑云母进行的常量元素变异分析表明,动力变形可造成矿物组分的变异,且这种变异有一定的次序S;i是动力变形中最稳定的组分,SiO2的增加可能是由其他组分的减少造成的,是相对的。
For better understanding the deformation rule of mass and the response of composition to deformation in natural stress condition, the granite sample is studied by equal deforming rate experiment in 600℃ and 600 Mpa. Under experimental conditions, the ganite shows the characteristics of brittle-ductile transition and a macroscopical conjugate fan deforming structure. The variations of major elements in feldspar and biotite experienced ductile shearing indicate that the deformations can make the mineral composition varies. The variation has a certain sequence. Silicon is the most inert composition, while the increasing of SiO2 is relative to the decreasing of other compositions.
出处
《世界地质》
CAS
CSCD
2006年第1期95-99,共5页
World Geology
基金
国家自然科学基金(40372095)
关键词
花岗岩
脆-韧性转化
矿物变形
组分变异
granite
brittle-ductile transition
mineral deformation
composition variation
