Could tectonic overpressure cause ultrahigh-pressure metamorphism?  

作　　者：Qingchen Wang Jingbo Liu Bolin Cong 

机构地区：[1]Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China

出　　处：《Chinese Science Bulletin》1999年第24期2295-2298,共4页

摘　　要：Could ultrahigh-pressure metamorphic rocks be caused, at depth of 32 km, by tectonic overpressure resulting from differential stress? The differential stress is limited by rock strength, which depends on strain rate and temperature. Therefore, tectonic overpressure could not go beyond 1 GPa, and could not cause the uitrahigh-pressure metamorphism.Could ultrahigh-pressure metamorphic rocks be caused, at depth of 32 km, by tectonic overpressure resulting from differential stress? The differential stress is limited by rock strength, which depends on strain rate and temperature. Therefore, tectonic overpressure could not go beyond 1 GPa, and could not cause the uitrahigh-pressure metamorphism. The stress-strain in plastic deformation, or in plastic stage of elasto-plastic deformation, has no linear relation, and should not be described by using linear equation of elastic deformation.

关 键 词：ULTRAHIGH-PRESSURE TECTONIC OVERPRESSURE PLASTIC deformation. 

分 类 号：P583[天文地球—岩石学]