摘要
为求得此前未曾测得过的郯庐断裂韧性构造事件的过程时间 ,选定居于安徽省肥东县桴槎山隶属郯庐断裂南段主断裂韧性剪切带糜棱岩为研究对象。运用显微构造物理化学方法 ,首先测算形成糜棱岩的差异流动应力 ,以进行应变速率 ( ε)的求算 ;然后 ,用等浓度线法和晶胞参数法分别测算糜棱岩化过程中岩石体积应变量 (fV) ;再根据公式t =-lnfV/ ε ,计算出糜棱岩化过程时间 (t)。结果得出该糜棱岩带的形成时限为几十万年 (0 19～ 0 94Ma)的时间跨度 ,不同方法测定时限的精度差值在半个量级左右。
To calculate the duration time of Tancheng\|Lujiang Fault's ductile tectonic event that has never been measured, the research object we selected is the mylonite of the ductile shear zone of main fault in the south of Tancheng\|Lujiang Fault, Fucha Hill,Feidong County,Anhui Province.First,by using the physicochemical methods for microstructure,the different flow stress causing the formation of the mylonite was measured,and the strain rates were calculated.Then,by using isoconcentration line and cell parameter, the volume strain capacity was calculated.Finally, by using the expression t =-ln f V/ ,the duration time of structural deformation for the ductile shear zone was calculated.The result shows that the duration time is about hundreds of thousands years(0 19～0 94Ma) with a half magnitude of precision inaccuracy among different measures.
出处
《地学前缘》
EI
CAS
CSCD
2002年第2期475-482,共8页
Earth Science Frontiers
基金
国家自然科学基金资助项目 ( 4 0 172 0 72 )
国家"九五"重点科技攻关资助项目 ( 96 110 )
关键词
构造形成时限
晶胞参数法
等浓度线法
应变速度
流动应力
韧性剪切带
郯庐断裂
duration time of structural deformation
cell parameter
isoconcentration line
strain rates
flow stress
ductile shearing zone
Tancheng\|Lujiang Fault
