恒山太和岭口新断裂的地质特征

A Preliminary Discussion on Deformational Decomposition of Metamorphic Rock Series in North Part System of the Luliang mountains

滹沱河上游，代县太和岭口村附近发现新构造断裂群，主干断裂发育在基岩山体与第四系之间，断面倾角较缓且略呈上陡下缓趋势。正断层的下降盘出现反向牵引的背斜和反向正断层。它寓示着断层的水平位移量与速率可能高于垂向的位移量与速率。因而具裂谷拉张过程中形成的铲状低角度正断层的特点。

In metamorphic rock series of north part of the Luliang mountains,phenomena of the deformational decomposition can be appeared from macroscopic to microcosmic at all scales. Horizontally the strong and weak deformation zones (regions)are occured as netted works and vertically with the depth increased,the strong and weak deformation zones(regions)are growing and declining each other.Under the deformational decomposition,the hornblende was changed to biotite and chlorite,and the number of plagioclase was reduced.For the mineral of lower rheid limit occurs dissolution,thus they might fill in the tensional fissures to form crystalline veins metacrysts under a certain condition ,those result in the rock textures and structures changed from massive to gneissoid and schistoid.Chemically the Mg、Fe、Ti、P、K and Rb are increased and the Si,Na and Sr are reduced.Those changes are opposite to comagmatic evolutionary law.From this,the author infers that augen gneiss of Archaeozoic erathem might exist the genetic type of deformational decomposition of gray gneiss.