TYPICAL TECTONIC STYLES AND THEIR GEOLOGIC SIGNIFICANCE IN EASTERN GUIZHOU PROVINCE
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摘要: 黔东地区发育中、新元古代至新生代地层和多种类型的岩浆岩、变质岩, 存在多期次构造运动, 主要可划分为武陵构造旋回期、加里东构造旋回期、燕山构造旋回期和喜马拉雅旋回期。形成的典型构造样式分别有阿尔卑斯式褶皱、侏罗山式褶皱、逆冲推覆构造、韧性剪切带、变质核杂岩构造及伸展剥离断层系、平行走滑断层系、地垒—地堑构造等。在不同的构造旋回期, 其构造样式的差异反映出了所处构造位置的不同, 进而在平面上反映出江南造山带是由不同时期的造山亚带组成且具有向东迁移的演化历史的复合造山带。Abstract: The Mesoproterozoic-Neoproterozoic to Cenozoic strata, including many types of magmatite and metamorphite, are developed in eastern Guizhou Province.Multi-periods of tectonic movements happening in the study region have been divided into Wuling structural cycle, Caledonian tectonic cycle, Yanshan tectonic cycle and Himalayan tectonic cycle.Typical structural styles are Alpine fold, Jura-type fold, thrust-nappe structure, ductile shear zone, metamorphic core complexes, extension-stripped fault system, strike-slip fault system, horst-graben structure, respectively.Difference of tectonic styles in different tectonic periods reflects the difference of structural positions.Therefore, in the plane, the Jiangnan orogenic belt is a composite orogenic belt composed of different orogenic sub-belts with evolution history of eastward migration.
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图 1 黔东及邻区大地构造略图
Ⅰ扬子陆块 Ⅱ江南造山带 Ⅲ华夏陆块 ①师宗—松桃—慈利—九江断裂带(北亚带); ②罗城—龙胜—桃江—景德镇断裂带(中亚带); ③北海—萍乡—绍兴断裂带(南亚带)
Figure 1. A sketch map showing the tectonics in eastern Guizhou and adjacent areas
图 2 贵州江口县黑湾河梵净山群褶皱素描图
Figure 2. A sketch map showing the folds in Fanjingshan Formation in Heiwanhe area in Jiangkou County, Guizhou Province
图 3 雷公山复式背斜剖面图
1.变余凝灰岩; 2.绢云母板岩; 3.变余粉砂岩; 4.绢云母千枚岩; 5.石英岩; 6.断层
Figure 3. Section of the composite anticline in Leigong Mountain
图 4 雷山县排里坳同斜褶皱构造剖面图
a.剪切透镜体; b.膝褶; c.d.层片关系; e.石香肠; f.窗棂板造; g、s-c构造; h.褶皱转湾端及轴面劈理
Figure 4. Section of the congruous fold structure in Pailiao area, Leishan County
图 5 从江县新村下江群甲路组滑脱构造带素描图
Figure 5. A sketch map showing the d é collemant structure in the Jialu Formation in Xincun area, Congjiang County
图 6 黔东地区隔槽区褶皱剖面图
Figure 6. Section of the wide-spaced synclines fold in eastern Guizhou Province
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