| 莫霍界面的性质 |
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| 引用本文： | 曾融生.莫霍界面的性质[J].地球物理学报,1964,13(2):180-188. |
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| 作者姓名： | 曾融生 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 本文綜述了当前对莫霍界面性貭的学說,列举了相变学說所遇到的困难。根据新近地震面波和体波所获得有关地幔頂部速度分布的资料,进一步探討了莫霍界面的性貭,所得的結論为: （1）大陆和海洋的莫霍界面都不是相变面; （2）地幔頂部沿深度方向不可能由均勻物貭所組成,低速带的形成与物貭的組成有关; （3）大陆和海洋的地幔頂部,其差异主要在于低速带頂面位置的不同,大陆的較深,海洋的較浅; （4）根据放射性含量的測定,組成地幔頂部的物貭可能是榴輝岩与其他超基性岩石的混合物,其速度受溫度的影响不大。
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| 关 键 词： | 莫霍界面 低速带 相变 大陆 海洋地壳 横波速度 速度分布 玄武岩 放射性 弹性波速度 |
THE NATURE OF THE MOHOROVI（?）I（?） DISCONTINUITY |
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| TSENG JUNG-SHENG.THE NATURE OF THE MOHOROVI（?）I（?） DISCONTINUITY[J].Chinese Journal of Geophysics,1964,13(2):180-188. |
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| Authors: | TSENG JUNG-SHENG |
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| Institution: | Institute of Geophysics and Meteorology, Academia Sinica |
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| Abstract: | The present paper discusses the various theories on the nature of the Mohorovi（?）i（?） discontinuity and the difficulties encountered by the phase-change hypothesis. By examining the velocity distribution data recently obtained by use of seismic body and surface waves, the following conclusions can be made: （1） The Mohorovi（?）i（?） discontinuity, either under the continents or the oceans, cannot be interpreted as a surface of phase transition. （2） The chemical composition of the upper mantle is not homogeneous in the vertical direction. The low-velocity layer in the upper mantle is probably "caused by a change in composition rather than by the temperature effects. （3） The top surface of the asthenospheric low-velocity layer is deeper under the oceans than under the continents. （4） The chemical composition of the upper mantle, according to the data of radioactive measurements, may be some mixtures of eclogites or other ultra-basic rocks, their change of velocity due to temperature effects being very small. |
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