| 地幔的蠕变性质 |
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| 引用本文： | 郭自强,谢小碧.地幔的蠕变性质[J].地球物理学报,1982,25(4):304-314. |
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| 作者姓名： | 郭自强 谢小碧 |
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| 作者单位： | 中国科学技术大学地球及空间科学系 |
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| 摘 要： | 地幔的蠕变特性是地球物理学中一个普遍关心的问题。本文以地球模型和地球热模型为基础,结合理论导出的蠕变方程和岩石蠕变实验的结果,考虑到温度、压力、晶粒直径及相变过程对地幔流变特性的影响,计算了整个地幔的蠕变性质和等效粘滞性。 结果表明,当晶粒直径d≤1毫米时,扩散蠕变是主要的,地幔行为与牛顿流体相似。当d≥10毫米时,幂函数蠕变成为主要的形变机制,地幔呈非牛顿粘滞性。从得出的结果来看,并不存在高粘的下地幔。
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| 关 键 词： | 蠕变特性 蠕变性质 应变速度 粘滞性 蠕变机制 晶粒直径 蠕变方程 地球模型 扩散蠕变 地幔 |
| 收稿时间： | 1981-03-26 |
THE CREEP PROPERTY OF THE EARTH'S MANTLE |
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| GUO ZI-QIANG,XIE XIAO-BI.THE CREEP PROPERTY OF THE EARTH'S MANTLE[J].Chinese Journal of Geophysics,1982,25(4):304-314. |
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| Authors: | GUO ZI-QIANG XIE XIAO-BI |
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| Institution: | Dept. of the Earth and Space Science, University of Science and Technology of China |
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| Abstract: | Based on the Earth's model and Earth's thermal model, and combining the theoretical creep equations with the experimental data on rocks, this paper gives the creep property and viscosity-depth profile in the whole mantle. The effects of the temperature, pressure, grain diameter and phase transition are considered.Our result shows, if the grain diameter d#1mm., diffusion creep is the dominent mechanism, and the mantle behaves as a Newtonian fluid. But if d#10mm., power-law creep becomes the dominent mechanism, and the mantle is a non-Newtonian fluid. The mantle has a relatively homogeneous viscosity, the mean viscosity for the upper mantle is 1019-1021 poises according to grain diameter, and for lower mantle it is near 1022 poises. This result is in agreement with macroscopic observations and suggests that whole mantle convection is possible. |
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