大陆褶皱造山运动的星地碰撞成因

刘广润; 张宏泰

大陆褶皱造山运动的星地碰撞成因

刘广润^1,,
张宏泰²

1.
华中科技大学水电学院，湖北武汉 430074
2.
湖北省地质调查院，湖北武汉 430030

详细信息

作者简介:
刘广润(1929-)，男，教授，中国工程院院士，主要从事工程地质环境地质研究.E-mail：liugrs@tomcom

中图分类号: P542
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出版历程
- 收稿日期: 2006-10-23
- 刊出日期: 2007-01-25

Continental Folding Orogenesis from the Perspective of Collision Dynamics of a Celestial Body with the Earth

LIU Guang—run^1
,,
ZHANG Hong—tai²

1.
School of Water and Electricity, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Hwbei Institute of Geological Survey, Wuhan 430030, China

摘要

摘要: 大陆褶皱造山运动具有突发性、全球同步性，以水平运动为主，主要表现在地壳上部且具有上强下弱等特征，除水平运动一项外，与基于地幔对流的板块构造理论缺少共同之处.想用板块构造理论解释遍布大陆地块内部的褶皱构造，在形位特征与动力机制上都有难以解决的矛盾.基于地球自转速度变化的地质力学理论，对之所做的定性解释颇为合理，但因其只靠地球收缩及潮汐引力等缓变力作为引起地球自转速度变化的动力来源，力量强度太小，不足以引发强大的褶皱造山运动，且有被海水运动取代的难题.揭示了星地碰撞可以为大陆造山运动提供足够强大的突发性动力来源，并简要阐明了其作用机制，可以解决地质力学所遇到的力源不足和被海水运动取代的两大难题，从而为大陆构造研究开辟了一个新境界.
- 大陆褶皱造山运动 /
- 成因 /
- 星地碰撞
Abstract: The continental orogenesis is characterized with the following features, such as sudden start, global synchronicity and horizontal movement, occurring mainly in the upper part of the crust and weakening with depth, and SO on.It is difficult to explain these characteristics by the plate tectonic theory based on the heat convection in earth mantle.The geomechanics based on the change of rotating speed of the earth could answer a large part of the above mentioned questions, but the power which it depends on offered by the expansion or contract of the earth and tides et al is too weak to serve as the energy to change the rotating speed of the earth, SO it is also difficult to explain them quantitatively.This paper reveals the collision energy of a celestial body with the earth could induce a sufficient change of rotating speed of the earth to make the folding orogenesis, and briefly explains its mechanics, and therefore offers a brandnew perspective for researching continental orogenesis.
- continantal folding orogenesis /
- cause of formation /
- collision of a celestial body with the earth

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图 1 意大利亚平宁半岛中部逆掩断层带横剖面示意图(Piero Elter et al.，2003)

1.更新世及第四纪海相及陆相覆盖层；2.新第三纪沉积层；3~9.主要由碳酸盐岩陆台和沉积盆地物质构成的构造单元层；lO.亚得里亚山前沉积层；11.逆掩断层带下的磁性基底；12.亚得里亚山前沉积下面的磁性基底

Fig. 1. Schematic cross-section of the central Apennine thrust belt

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图 2 西秦岭上古生界构造剖面图(王宗起等，2005)

Pz_l.下古生界李子园群；D-T.泥盆系-三叠系；D_2-3.中、上泥盆统舒家坝群；D_1-3.泥盆系西汉水群；D₃-C₁.泥盆一石炭系大草滩群；C石炭系；F₂.断层及其编号

Fig. 2. Structural section and sedimentary columns of the Upper Paleozoic in the West Qinling

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图 3 苏南小游山推覆构造剖面图(胡连英和李起彤，1986)

Q第四系；K₁.下白垩统；S₂.中志留统；S₃.下志留统

Fig. 3. Xiaoyoushan structural profile diagram

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图 4 运动地体在不同深度的软弱面上造成剪切破坏的力学解析示意图

Fig. 4. Schematic diagram showing dynamics of sheering crack along weak surfaces in different depths caused by a moving shallow crust block

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图 5 浅层地体在经向惯性离心力作用下褶皱造山示意图

Fig. 5. Schematic diagram showing folding orogenics with meridional inertial centrifugal force of a shallow crust block

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图 6 三维模型计算网格正视图(典型段：单元6 040个，节点为13 398个)

Fig. 6. Elevation of 3D-model mesh

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图 7 FLAC^3D软件中interface的本构模型

Fig. 7. Constructive model of interface in FLAC^3D

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图 8 模型地层褶皱及隆起成山的位移等值线图(典型段)

Fig. 8. Drape and the displacement contour map

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图 9 模型地层褶皱及隆起成山的位移矢量图(典型段)

Fig. 9. Drape and the displacement vector map

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