| 论辽河群层序的有序性 |
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| 引用本文： | 方如恒.论辽河群层序的有序性[J].国土资源,1993(2). |
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| 作者姓名： | 方如恒 |
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| 作者单位： | 辽宁省地质矿产局 沈阳 |
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| 摘 要： | 从排列顺序、基本地层单位、稳定的岩性变化面或标志层、相变、层控矿床、褶皱构造六个方面分析,表明辽河群层序是有序的。辽河群遭受三次变形,即:下降阶段的下部构造层次的变形,有压扁作用和重结晶作用,形成广域流劈理和区域变质岩;上升阶段的中间构造层次(A)的变形,有重力滑动形成的不协调褶皱、顺层剪切形成的韧性剪切带与层内(片内)褶皱和水平拉张形成的拉伸线理与线状构造;褶皱阶段的中间构造层次(B)的变形,有局部出现劈理的平行褶皱与相似褶皱并存,伴生有逆冲型韧性剪切带和逆冲-推覆构造。这种两次垂直运动变形和一次水平挤压运动变形的构造模式是决定辽河群层序有序性的构造基础。流劈理不是拉伸、轴面片理、多期构造作用的构造置换等成因机制形成的,而是在垂直压扁下化学成因的产物,可称顺层片理或构造层理。流劈理的成因机制是讨论辽河群层序有序性的核心问题。
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| 关 键 词： | 辽河群 层序 变形序列 流劈理 有序性 |
ON THE ORDERED LIAOHE GROUP SEQUENCES |
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| Fang Ruheng.ON THE ORDERED LIAOHE GROUP SEQUENCES[J].Land & Resources,1993(2). |
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| Authors: | Fang Ruheng |
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| Abstract: | Analysis on the arranging of sequences, basic strata units, steadly changing of lithological sections or marker beds, changing of facies, strata bound deposits, fault structures show that Liaohe Group sequences are ordered. Liaohe Group was subjected to 3 times of deformation: (1) descending stage; (2) uprising stage and (3) folding stage. During the first descending stage, the lower part was deformed into regional flow cleavage and regional metamorphic rocks, there were flattening deformation and recrystallization. During the second uprising stage, the middle part(A) was deformed, there were discordant folds formed by the gravity sliding, ductile shear belts and intraformational folds by bedding shearing, and strenching lineations and linear structures by horizontal extension. During the third folding stage, the middle part (B) was deformed, there were parallel folds and similar folds, locally with cleavages, and also reverse ductile shear zones and reverse-nappe structures. This kind of structure model of two times of vertical movement deformation and one time of horizontal compression deformation is the structure basis of the order of Liaohe Group sequences. The paper suggests that the origion of flow cleavage is chemogenic structure replacement caused by vertical flattening, rather than other structure replacement of stretching, axial-plane cleavage or multiphase tectonic activity, so the flow cleavage can be called bedding cleavage or structure bedding. The origin of flow cleavage is the core to discuss the ordered Liaohe Group sequences. |
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| Keywords: | Liaohe Group Sequence Deformation succession Flow cleavage Origin mechanism |
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