| Rheological Simulating Study of Mechanical Conditions for Syn-extensional Basin and Mountain Coupling System |
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| 作者姓名： | WuHongling YinXiulan |
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| 作者单位： | InstituteofGeomechanics,ChineseAcademyofGeologicalSciences,Beijing100081 |
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| 基金项目： | ThispaperissupportedbytheNationalNaturalScienceFoundationofChina (No .1 9972 0 64)andtheMinistryofLandandResources (No.991 0 0 5) |
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| 摘 要： | This article gives a mechanical model, in which the layers of lithosphere are assumed to be the creep materials, to study the coupling mechanism of a syn-basin-mountain system quantitatively by using the numerical simulating method. A geological dynamic extensional mode given by some geologists is theoretically discussed and verified. The study shows that lithosphere thickening or thinning is closely related to the thermal activity, or in other words, thermal convection beneath the lithosphere. It is one of the important factors affecting the formation of the basin-mountain coupling system. As an essential condition, only the upward buoyant force and the horizontal dragging force caused by the thermal convection jointly act on the bottom of the lithosphere, the stress and strain states in rock‘‘s layers are advantageous to forming the tectonic-landforms of the basin-mountain coupling system. A study on the creep features of the lithosphere shows that the stress and strain in the rock‘‘s layers vary with time when the lasting forces act on the boandary. They increase rapidly at initial stage and decrease steadily after reaching the peak value. Phenomena of stress relaxation are significant for studying the tectonic evolution.
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| 关 键 词： | 流体力学 机械模型 盆地 耦合系统 山脉 地质学 |
Rheological Simulating Study of Mechanical Conditions for Syn-extensional Basin and Mountain Coupling System |
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| WuHongling YinXiulan.Rheological Simulating Study of Mechanical Conditions for Syn-extensional Basin and Mountain Coupling System[J].Journal of China University of Geosciences,2003,14(4):330-338. |
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| Authors: | Wu Hongling Yin Xiulan |
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| Abstract: | This article gives a mechanical model, in which the layers of lithosphere are assumed to be the creep materials, to study the coupling mechanism of a syn-basin-mountain system quantitatively by using the numerical simulating method. A geological dynamic extensional mode given by some geologists is theoretically discussed and verified. The study shows that lithosphere thickening or thinning is closely related to the thermal activity, or in other words, thermal convection beneath the lithosphere. It is one of the important factors affecting the formation of the basin-mountain coupling system. As an essential condition, only the upward buoyant force and the horizontal dragging force caused by the thermal convection jointly act on the bottom of the lithosphere, the stress and strain states in rock's layers are advantageous to forming the tectonic-landforms of the basin-mountain coupling system. A study on the creep features of the lithosphere shows that the stress and strain in the rock's layers vary with time when the lasting forces act on the boundary. They increase rapidly at initial stage and decrease steadily after reaching the peak value. Phenomena of stress relaxation are significant for studying the tectonic evolution. |
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| Keywords: | lithosphere thinning basin-mountain system dynamic mechanism creep numerical simulating method |
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