| 伸展构造及其反转作用 |
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| 引用本文： | 刘和甫.伸展构造及其反转作用[J].地学前缘,1995,2(1):113-124. |
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| 作者姓名： | 刘和甫 |
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| 作者单位： | 中国地质大学 |
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| 基金项目： | 国家自然科学基金和地矿部重要基础研究项目 |
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| 摘 要： | 伸展构造的演化主要发生在三个阶段：大陆裂谷阶段、大陆初始漂移和主要漂移阶段。伸展构造发育在不同构造层次：（１）在上地壳中，伸展构造呈现为位于拆离带之上脆性岩块的伸展，其周边为铲式断层、坡坪式断层或多米诺式断层所限；（２）在中地壳中，伸展构造呈现为变质透镜体，被不连续的韧性剪切带所分隔；（３）在下地壳中，伸展构造呈现为扩展变平的韧性流动和岩浆侵位。反转的伸展断层系常表现为冲断层、断弯背斜、生长断展褶皱、顶部塌陷地堑区的突隆构造和半地堑区的鱼叉构造等。
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| 关 键 词： | 伸展构造，反转构造，拆离断层，构造层次 |
EXTENSIONAL TECTONICS AND ITS INVERSION |
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| Liu Hefu.EXTENSIONAL TECTONICS AND ITS INVERSION[J].Earth Science Frontiers,1995,2(1):113-124. |
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| Authors: | Liu Hefu |
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| Abstract: | The evolution of extensional tectonics occurs in three main phases:(1) the con-tinental rifting phase,(2)the onset of drifting,and (3)the main drifting.Extensionalstructures formed at different tectonic levels:(1)the upper-crust brittle blocks above thedecollement faults are bounded by listric faults,ramp-flat faults and domino fault sys-tems,(2)the middle-crust is extended by discontinuous ductile shear zones separatingmetamorphic lenses,and (3)the lower-crust is extended by more pervasive ductile flatten-ing and by dykes. Extensional fault systems which have u ndergone inversion commonlyshow thrust faults,shortcut-faults, fault-bend folds,fault-propagation folds,pop-upstructures in the region of the crestal collapse graben,and harpoon structures in the regionof the half graben. |
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| Keywords: | extensional tectonics inversion tectonic level decollement fault |
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