| 郯城-涟水综合地球物理剖面 |
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| 引用本文： | 杨文采,胡振远,程振炎,倪诚昌,方慧,白金.郯城-涟水综合地球物理剖面[J].地球物理学报,1999,42(2):206-217. |
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| 作者姓名： | 杨文采 胡振远 程振炎 倪诚昌 方慧 白金 |
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| 作者单位： | 1. 中国地质科学院地质研究所 北京 100037;
2. 地质矿产部地球物理地球化学勘查研究所 河北廊坊 065000;
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3. 新星石油公司华北局第四物探大队 河南新乡 453700 |
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| 基金项目： | 原地质矿产部资助的重点基础研究项目!9501206 |
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| 摘 要： | 在穿过苏鲁地体的郯城-涟水剖面上进行了深反射地震和大地电磁调查，剖面全长１３９．５ｋｍ，取得了高质量记录，一级品记录高达８５％。结果表明：（１）苏鲁超高压－高压变质岩片向北西倾斜，表现为高速高阻岩片，并受到强烈的变形，反映了超高压岩片的俯冲与折返；（２）杨子克拉通向北俯冲在苏鲁地体之下，表现为常速、中低阻的挠曲板状体，内部有大量反映碰撞的反射楔形体；（３）嘉山-响水断裂带向南陡倾，低阻带直通浅地幔，具有燕山期裂谷的特征，估计有可能是与沂沭断裂带同期的中生代裂谷；（４）印支期俯冲扬子地壳的古Ｍｏｈｏ面与期后形成的新Ｍｏｈｏ面都有强反射，表明中新生代在地壳底部有强烈的岩浆活动与壳幔相互作用，促使新Ｍｏｈｏ面的形成；（５）超高压变质带下方有一组南倾的逆断层，与折返有关，在此处进行科学钻探对了解超高压变质带形成和折返机制很有利。
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| 关 键 词： | 深反射地震 大地电磁 郯城-涟水剖面 苏鲁超高压变质带 中国东部 |
| 收稿时间： | 1998-09-20 |
LONG PROFILE OF GEOPHYSICAL INVESTIGATION FROM TANCHEN TO LIANSHUI, EAST-CENTRAL CHINA |
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| YANG WEN-CAI, HU ZHEN-YUAN, CHENG ZHEN-YANNI CHENG-CHANG, FANG HUI, BAI JIN.LONG PROFILE OF GEOPHYSICAL INVESTIGATION FROM TANCHEN TO LIANSHUI, EAST-CENTRAL CHINA[J].Chinese Journal of Geophysics,1999,42(2):206-217. |
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| Authors: | YANG WEN-CAI HU ZHEN-YUAN CHENG ZHEN-YANNI CHENG-CHANG FANG HUI BAI JIN |
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| Institution: | 1. Insnmte of Geology, CAGS Beijing 100037, China;
2. Institate of Geophysical &; Geochemical Exploration, Lanfang 065000, China;
3. The Fourth Geophysical Team of New-Star Petroleum Company, xnxiang 453700, China |
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| Abstract: | Deep seismic reflection and MT surveys along an 139km profile across the SuluUHPM terrane from Tangchen to Lianshui have been completed, producing highquality records and rich geological information about crustal structures. The resultsinclude (a) The Sulu UHPM and HPM terrane is a rock-slice with high velocity andresistivity, dipping northwest and undergone heavy deformation, implying itssubduction and then exhumation during Track Period, (b) the Yangtze craton,showing as a bent plate with normal velocity and relatively low resistivity, wassubducting northward beneath the Sulu UHPM terrane, containing a lot of wedgereflectors related to the collision between the Sulu and the Yangtze; (c) the Jiashan-Xionzhui fault zone contains two faults of steeply dipping south, corresponding to alow-resistivity zone reaching the oppermost mantle, probably implying that it might bea Mesozoic rift similar to the Ni-Shu Fault zone; (d) both the old Moho of theIndosinian subducting Yangtze crust and the new Moho formed after IndosinianMovement have strong and clear reflectors, indicating strong magmatic activities andinteraction between the crust of the mantle during Mesozoic Period which contributedto the formation and the new Moho; and (e) a group of thrusts exist in the uppercrust under the Sulu UHPM belt which may closely related to the exhumation of theUHPM belt, encouraging the scientific drilling in the South Sulu area whose aimsinclude revealing the exhumation dynamics of the UHPM belt. |
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| Keywords: | Deep seismic reflection Magnetotelluric survey Long geophysicalprofile Sulu UHPM belt East-Central China |
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