| 剪切生热与花岗岩部分熔融——关于喜马拉雅地区逆冲断层与地壳热结构的分析 |
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| 引用本文： | 朱元清,石耀霖.剪切生热与花岗岩部分熔融——关于喜马拉雅地区逆冲断层与地壳热结构的分析[J].地球物理学报,1990,33(4):408-416. |
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| 作者姓名： | 朱元清 石耀霖 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学系, 合肥;
2. 中国科学院中国科技大学研究生院, 北京 |
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| 摘 要： | 本文对影响喜马拉雅逆冲断层地区热结构的三种主要热源（断层的摩擦剪切热,地壳的放射性热和上地幔的传导热）的效应进行了计算分析,在计算中考虑了岩石的流变性造成的剪应力和温度的非线性关系及岩石温度到达熔点时的熔解热.结果表明,尽管地壳的放射性热和上地幔的传导热也可能引起地壳中的部分熔融,但此时熔融将从地壳底部开始发生,这与喜马拉雅地区观测到的地质现象不符;在考虑了剪切断层带的剪切热后,熔融将从断层附近开始发生,因此得到了比较符合实际地质现象的结果.
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| 关 键 词： | 青藏高原 热结构 岩石熔融 摩擦剪切热 |
| 收稿时间： | 1989-03-24 |
SHEAR HEATING AND PARTIAL MELTING OF GRANITE——THERMAL STRUCTURE AT OVERTHRUSTED TERRAINS IN THE GREATER HIMALAYA |
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| ZHU YUAN-QING,SHI YAO-LIN.SHEAR HEATING AND PARTIAL MELTING OF GRANITE——THERMAL STRUCTURE AT OVERTHRUSTED TERRAINS IN THE GREATER HIMALAYA[J].Chinese Journal of Geophysics,1990,33(4):408-416. |
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| Authors: | ZHU YUAN-QING SHI YAO-LIN |
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| Institution: | 1. University of Science and Technology of China. Hefei;
2. Graduate School, USTC, Academia Sinica, Beijing |
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| Abstract: | Granites to the north of the main central thrust fault （MCT） in the Himalaya are found of crustal sources. High heat flow in this region is suggested to be an indication of recent meg-matic intrusion to the upper crust. Mechanism for the formation of crustal melting are studied in this paper. Contributions of three main heat supplies: frictional or shear heating, radiogenic heating, and mantle heat flow, are investigated. Special attention has been paid to the nonlinear rheological properties of rocks which affect stresses and heat generation on the fault. Thermal effect of fusion heat on the temperature profile is also included. It is found that although radiogenic heating and supply of heat from the mantle can cause melting of the crust, the melting, however, would start from the bottom of the lower crust. This is in contract to the observed evidences of granites formation at the middle of the crust. Such observation can be explained only if shear heating exists near the fault. |
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| Keywords: | Tibetan plateau Thermal tructure Melting of granite Shear heating |
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