摘要
作者认为,鉴于浅变质岩部分或大部分经受了固流态变形作用的改造,它既保存有残余(原生)构造,又有后期新生的流变褶皱(褶叠层)及韧性剪切变形,并引起岩石组构的调整和构造置换。因此,提出采用“以岩性分层为基础,以构造解析为主导”的工作方法。换句话说,就是要遵循构造地层学准则,以便查明岩层的正常叠覆关系,正确建立浅变质岩区的填图地层单元。本文根据浅变质岩区的基本构造型式——褶叠层构造,进行详细解析的基础上,提出了如何划分和对比地层的一些基本方法。
As part or most of low-grade metamorphic rocks have undergone solid-and liquid-state deformation, not only relict (primary) structure has been preserved but there also occur late-stage rheomorphic folds (folding layers) and ductile shear deformation as well as readjustment of rock fabrics and transposition of structure. Therefore the authors stress that we should adopt the working method of 'taking the lithological division as the foundation and the structural analysis as the dominant factor of the geological work'; in other words, we should follow the tectonostratigraphic criteria in order to ascertain the normal superposition relation of the strata and establish correct stratigraphical units for mapping in low-grade metamorphic terranes. According to the basic structural style——folding structure——in low-grade metamorphic terrane, this paper proposes some fundamental methods for stratigraphical division and correlation.
出处
《中国区域地质》
CSCD
1990年第3期262-268,共7页
Regional Geology of China
