摘要
陕西境内的陶湾群和大片出露的寒武纪地层之间,发育一套以千枚岩夹白云岩透镜体为主的复杂岩系。这套岩系实际上构成一个剪切混杂带,成为秦岭造山带和华北地台的界线。该带不是一个沉积地层单位,而应视为岩石-构造组合体,带内发育一系列冲断层。在洛南柏峪寺地区,从中可以分出3个构造岩片,其中的白云岩岩块为构造岩块。根据显微、小构造分析及岩性对比,认为冲断层由北向南逆冲,带内至少卷入有晚元古代大庄组、震旦纪罗圈组、中下寒武统及少量陶湾群。后期的强烈的构造变动使原地层支离破碎,层序发生了很大变化。
In Shaanxi province there outcrops a complex rock series composed mainly of phyllite intercalated with lens -shaped dolomitite between Taowan Group and the Cambrian System. This rock series actually forms a shear-melange belt (SMB) the boundary between Qinling orogenic belt and North China Platform. The belt is not stratigraphic but tectonic unit. In Baiyushi area the belt can be divided into three tectonic slices separated by a series of thrusts. The tectogenetic dolomitite blocks occurring in the belt also can be regarded as secondary slices. According to analyses of microstructure, small -scale structure and lithologic comparison, the thrusts are believed to be moved southward and at least late Proterozoic Dazhuang Formation, Sinian Luoquan Formation and Middle - Lower Cambrian series and some of the Taowan Group were involved in the belt. Strong tectonic deformation resulted in fragmentation of the original strata and great changes in the sequence of strata. The shear-melange belt originated mainly in the Yanshanian Stage.
出处
《地质论评》
CAS
CSCD
北大核心
1995年第3期221-228,共8页
Geological Review
基金
国家自然科学基金 (编号49290100)
地质矿产部"八五"攻关项目85-01-018-01课题
关键词
剪切混杂带
陶湾群
陕西
地层
寒武纪
north of the Taowan Group, shear-melange belt (SMB) Shaanxi Province
