摘要
煤田构造虽然以脆性变形为主,但断裂构造岩中亦发育了多种塑性变形构造。这些塑性变形在超微尺度中则表现为各式各样的超微构造,如位错线、亚颗粒及动态重结晶等等。不同的超微构造形成于不同的变形阶段,因此根据超微构造特征探讨煤田构造的应力环境是一种有效的手段。文中利用位错密度及亚颗粒大小等方法分别估算了安徽省两淮煤田及闽粤地区煤田推覆构造的古应力值,从而论述了这些地区推覆构造形成的应力差异。文中还通过淮南煤田舜耕山断裂的实例剖析,说明了应用岩石主要变形阶段的超微构造进行应力估算的重要性。
Brittle deformation are mainly found in coalfield structures,however, many plastic deformation structures are developed in fault tectonics.These are represented by various super-microstructures,such as,dislocation,sub-grain,and recrystallized grains,etc.according to super-microscopic criterion.Bcause super-microstructures are formed in different stages of deformation,it is an effective method to study stress environment of coalfield structures based on characteristics of these super-microstructures.Methods of dislocation density and size of sub-grains are used to calculate palco-stress values of nappe structures in Huainan and Huaibei regions of Anhui province and in Fujian and Guangdong provinces.Based on the results of calculation,the difference of stress in the formation of the nappe structures in these areas is discussed in the paper.The importance of using main super-microstructures formed in main deformation stage to calculate the paleo-stress value is explained in the paper by an example of Shungengshan fault in Huainan coalfield.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
1993年第1期78-86,共9页
Journal of China Coal Society
基金
国家自然科学基金资助项目
关键词
煤田
构造
超微构造
古应力
coalfield structure
super-microstructure
dislocation
sub-grain
paleo-stress
