| 青藏高原的隆升缩短及其粘弹性形变分析 |
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| 引用本文： | 武红岭,王薇,王连捷,张利容,崔军文.青藏高原的隆升缩短及其粘弹性形变分析[J].地质力学学报,1996,2(1):17-24. |
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| 作者姓名： | 武红岭 王薇 王连捷 张利容 崔军文 |
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| 作者单位： | 1. 中国地质科学院地质力学研究所; |
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| 摘 要： | 本文依据新生代以来喜马拉雅和青藏高原发生的强烈的构造形变特征,用二维粘弹性有限元数值方法模拟估算了在印度板块向北推挤欧亚大陆的动力条件下,高原各构造单元的形变速率以及由此推算出40Ma以来青藏高原的隆升量和缩短量。反演了各地体岩石力学参数,特别是有效粘性系数η的数量级。认识到物性参数对构造应力场和形变速率的极重要的影响作用。阐明了除了动力机制和边界条件外,岩石圈各圈层材料力学性质的不均一是造成位移场、应力场和形变速率的差异,从而引起各种复杂地质构造现象的基本因素之一。
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| 关 键 词： | 青藏高原 构造形变 流变性 粘弹性 |
UPLIFTING AND SHORTENING OF TIBETAN PLATEAU AND VISCO-ELASTIC DEFORMATION ANALYSIS |
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| Wu Hongling,Wang Wei,Wang Lianjie,Zhang Lirong and Cui Junwen.UPLIFTING AND SHORTENING OF TIBETAN PLATEAU AND VISCO-ELASTIC DEFORMATION ANALYSIS[J].Journal of Geomechanics,1996,2(1):17-24. |
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| Authors: | Wu Hongling Wang Wei Wang Lianjie Zhang Lirong and Cui Junwen |
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| Institution: | 1. Institute of Geomechanics, CAGS;2. Center of Lithosphere, CAGS |
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| Abstract: | Based on the strong deformation which has taken place in the Himalayas and the Tibetan plateau caued by the northward push of the Indian plate since Cenozoic, an estimate by simulation is made of the strain rate of each tectonic unit and the consequent amount of u-plifting and shortening of the Plateau since 40Ma B.P.using two-dimensional visco-elastic Finite Element Analytic Method.The Mechanical Paramaters of rocks of each terrane, espe-cially the order of magnitude of the effective viscous coefficient η are deduced by inversion method.Detail calculation shows that in addition to the dynamic mechanism and boundary condition, the physical property of rocks play an important sole in determining the tectonic stress field and strain rate.It is the varied mechanical properties of the different lithospheric layers that lead to the difference in the stress field, displacement field and in the strain rate and resulting comolication of geologic strctures. |
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| Keywords: | Tibetan plateau tectonization rheology viscoelasticity |
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