变质岩构造置换与片层理概念的讨论

构造置换应分成形体置换和方位置换两类。形体置换是在一定尺度内新的透入性构造要素代替了旧的透入性构造要素,使后者不易识别或无法识别的置换作用;方位置换是在一定尺度内旧的透入性构造要素残存着,但其方位被改变,与新的透入性构造要素平行或近于平行的置换作用。片层理是受到不明显的形体置换和强的方位置换的层理,它具有片理的方位,层理的形体,是与片理产状一致的那一部分层理。

CONCEPTS OF STRUCTURAL TRANSPOSITION AND SCHIBEDDING OF METAMORPHIC ROCK. BISCUSSION

The author suggests that the structural transposition should be divided into form transposition and orientation transposition.The form transposition is a type of trans- position which in a certain scale, makes old penetrative structural elements replaced by new ones and, therefore, hardly or impossibly recognized. The orientation transposition refers to that the old penetrative structural elements are still discernible in a given scale, but their orientation has been changed in parallel to that of new penetrative structural elements.Schibedding (or schistose bedding) is a type of bedding which ever experienced intensive orientation. It bears both the orientation of schistosity and form of bedding, and as a part of beddings,it runs parallel to schistosity. Schibedding can either be bealt with as bedding, or be treated ?.s schistosity in structural analysis.