| 随县-马鞍山地带地壳与上地幔结构及郯庐构造带南段的某些特征 |
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| 引用本文： | 郑晔,腾吉文.随县-马鞍山地带地壳与上地幔结构及郯庐构造带南段的某些特征[J].地球物理学报,1989,32(6):648-659. |
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| 作者姓名： | 郑晔 腾吉文 |
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| 作者单位： | 中国科学院地球物理研究所 北京 |
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| 基金项目： | 国家科学基金;中国科学院基金 |
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| 摘 要： | 本义利用1979-1981年中国科学院地球物理研究所在随县-马鞍山所做的人工源地震探测的资料,采用二维射线追踪来拟合地震波的走时和振幅,取得了该地带的地壳与上地慢速度结构.结果表明,该地带地壳厚度为32-37km,莫霍面起伏变化显著.地壳速度的横向变化甚为强烈,地壳中部存在低速层.在巢湖以西宽数10km的范围内,地壳结构与其它地方明显不同,上地壳速度明显偏高,莫霍面上隆并有间断;在其两侧,明显可见有两条深断裂.结合其它地球物理场特征及大地构造概况,对结果进行分析,认为郯庐构造带南段被两条深断裂所夹,构造带宽度可达数10km,并在地质历史时期曾有过地幔物质上涌.
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| 关 键 词： | 随县一马鞍山地带 郯庐构造带 地震测深 二维射线追踪 衍射 速度结构 |
| 收稿时间： | 1988-12-12 |
THE STRUCTURE OF THE CRUST AND UPPER MANTLE IN THE SHUIXIAN-MAANSHAN ZONE AND SOME CHARACTERISTICS OF THE SOUTH PART OF THE TAN-LU TECTONIC BELT |
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| ZHENG YE,TENG JI-WEN.THE STRUCTURE OF THE CRUST AND UPPER MANTLE IN THE SHUIXIAN-MAANSHAN ZONE AND SOME CHARACTERISTICS OF THE SOUTH PART OF THE TAN-LU TECTONIC BELT[J].Chinese Journal of Geophysics,1989,32(6):648-659. |
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| Authors: | ZHENG YE TENG JI-WEN |
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| Institution: | Institute of Geophysics,Academia Sinica Beijing |
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| Abstract: | Ill this paper, the data of explosion seismology are studied, which were obtained by the Institute of Geophysics, Academia Sinica in the Shuixian-Maanshan zone from 1979 to 1981. The travel-times and amplitudes of the phases of seismic waves were fitted respectively using the 2-D ray tracing method. The structures of the crust and upper mantle were obtained. The crust thickness varies from 32 to 37 km. The Moho discontinuity rises and falls apparently. The velocity of the crust varies clearly in lateral direction. There is a low-velocity layer in the mid-crust. Within an area of tens of kilometers across which is west to the Chaohu Lake, the structure of the crust differs from other areas. The Moho discontinuity has been raised and interrupted. Two faults exist at the sides of the area. Finally, the result is analysed and discussed combining with other characteristics of geophysical field and tectonics. It is suggested that the Tan-lu tectonic belt is composed of two faults and is tens of kilometers wide, and that the mantle material rose up in the tectonic belt in geological history. |
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| Keywords: | Shuixian-Maanshan zone Tan-Lu tectonic belt Seismic sounding 2-D ray tracing Diffraction Velocity structure |
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