| 欧亚地区均衡残差大地水准面和上地幔强度 |
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| 引用本文： | 王勇,许厚泽.欧亚地区均衡残差大地水准面和上地幔强度[J].地球物理学报,1997,40(2):202-210. |
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| 作者姓名： | 王勇 许厚泽 |
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| 作者单位： | 中国科学院测量与地球物理研究所, 武汉 430077 |
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| 摘 要： | 首先计算了欧亚地区均衡残差大地水准面．基于地幔热对流的内负荷理论和最新全球层析成像结果，探讨了欧亚地区中波长均衡残差大地水准面的地球动力学意义．研究结果表明，中波长均衡残差大地水准面主要受上地幔粘滞度和岩石层强度的影响，进而得出欧亚地区一些古老地盾和构造稳定地区的上地幔与年轻山脉及构造活动地区的上地幔结构存在着差异．这个差异主要是占老地盾和构造稳定地区，如波罗的海地盾、中西伯利亚地台、东欧等区域，冷却的上地幔已穿透地幔较深，上地幔与岩石层之间耦合较好;而年轻山脉和构造活动区，如帕米尔、天山、贝加尔活动带、青藏高原、日本海周围地区，在上地幔可能存在着热物质即粘滞度很低的软流层，上地幔与岩石层耦合程度较差，甚至有可能解耦．从欧亚地区上地幔属性的差异，可以解释该地区的一些地球动力学问题．
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| 关 键 词： | 均衡 大地水准面 地幔对流 粘滞度 上地幔 欧亚地区 |
| 收稿时间： | 1995-05-26 |
THE ISOSTATIC RESIDUAL GEOID OVER EURASIA AND THE STRENGTH OF THE UPPER MANTLE |
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| WANG YOMG, XU HOU-ZE.THE ISOSTATIC RESIDUAL GEOID OVER EURASIA AND THE STRENGTH OF THE UPPER MANTLE[J].Chinese Journal of Geophysics,1997,40(2):202-210. |
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| Authors: | WANG YOMG XU HOU-ZE |
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| Institution: | Institute of Geodesy and Geophysics, Acadrmia Sinica, Wuhan 43007, China |
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| Abstract: | The isostatic residual geoid over Eurasia was calculated. The implication of intermidate wavelength geoid was discussed, based on the internal loading theory of mantle thermal convection and global seismic tomography data. The results obtained showed the intermidate wavelength geiod denpened on the viscosity structure of uppermost mantle and the strength of the lithosphere. Comparison of the isostatic residual geoid in intermidate wavelength with the geoid predicated by density anomalies of upper mantle in a viscous earth, indicated the presence of a low viscosity zone in the uppermost mantle beneath the younger, geologically active mountain belts such as Pamir, Tanshan, Baikal, Tibet, Kuril and Japan sea, and absent to the older shields and platform such as Baltic, Russia Siberia and southern China.The difference between the 0lder shield and platforms with the younger, geologhally active mountain can explain some geodynamical problems in Eurasia. |
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| Keywords: | Isostasy Geoid Mantle convection Viscosity Upper mantle Eurasia |
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