| 浙江省深部地球物理研究新进展──屯溪—温州、诸暨—临海地学断面及区域重力研究成果 |
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| 引用本文： | 孔祥儒,熊绍伯,周文星.浙江省深部地球物理研究新进展──屯溪—温州、诸暨—临海地学断面及区域重力研究成果[J].浙江国土资源,1995(1). |
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| 作者姓名： | 孔祥儒 熊绍伯 周文星 |
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| 作者单位： | 中国科学院地球物理研究所!北京100083 |
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| 摘 要： | 本文通过屯溪—温州、诸暨—临海两大剖面的重力、地磁、大地电磁的实测与研究。首次采用爆破地震、MT等当代物探新技术及综合物探等方法。横穿扬子、华南两微板块北东缘结合部，获取了地壳和上地慢结构的信息，指出浙江省域地壳呈5层结构，莫震面平均理深32km；发现了莫霍面附近的推覆析离构造。重新探讨了江山—绍兴等几条重要骨架断裂的位置与产状，确认了江山—绍兴、余姚—丽水断裂为超壳断裂。计算了剖面和浙东陆域区的火山岩厚度（一般在3km以内）；讨论了地壳深浅不同层次的主要推覆构造：在浙江区域地壳浅部存在江山—绍兴、江山廿八都—石浦、泰顺—黄岩3个推覆构造；证实浙江地壳深部构造总体框架为“两拗三隆”──浙北幔隆、萧山—常山鼻状幔隆、沿海幔隆、皖浙边界地幔坳陷及奉化—庆元幔坳陷等重要成果。为本区进一步开展地球科学研究，核电站等大型工程的选址，指导深部找矿提供了系统的综合物探资料，并对浙江一些基底构造进行延伸解释增强了结论的科学性。
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| 关 键 词： | 地学断面 地壳结构 莫霍面 软流圈 火山岩厚度 推覆构造 断裂 |
NEW PROGRESS ON DEEP GEOPHYSICAL RESEARCH IN ZHEJING: GEOLOGICAL SECTIONS OF TUNXI-WENZHOU AND ZHUJI-LINHAI AND THE ACHIVEMENTS OF THEIR REGIORALGRAVITY |
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| Authors: | Kong xiangru Xiong Shaobai Zhou Wenfu |
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| Abstract: | Lithosphere and earth change are two important subjects of geology researching. The completion of two large sections: Tunxi-Wenzhou anind Zhuji-Linhai has filled in the gaps in deep gebphysics of this aresa, which is concerned by numerous geologic researchrs. The main achievements are:For the first time, the demolition seism, MT and other new techmology methods were used across the north-west position of the two microplates of Yangzi and Huanan, and info mation of the styucture about crust and upper mantle were obtained. This work has supplied systematic and synthetical geophy sical materials for further researching, large engineerian position selection of nuclear power plant and mineral exploration. It's also pointed out that the crust of Zhejiang has a structure of five layers, the average deepth of MoHo is 32 km.Using synthtical geophysical methods, We have discussed the location of several important disputed faults in Zhejiang province (such as Jiangshan-Shaoxin), and we point out that botha Jiangshan-Shaoxin and Yuyao-Lishui are fauits beyond crust. We have calculated the thickness of volcanic rocks in the east of Zhejiang and the two se- ctions with a lot of methods, and pointed out of that the thickness of voIcanic rock is gen erally within 3 km, which is tallied the conclusion of seism.We have discused some main nappe structures of different depth gradation in the crust in Zhejicag province and the south-east coastal area. Through demolition seism, we have discovered the nappe structure nearby the MoHo plane. With the dedution of gravity, and aeronagnetic, we have found there are three nappe structure belts (Jiang-shao, Jiangshan ershba dushipu, Yaishui -Huangyan)Wtich were fromed in Erian and Yenshan period respectively.With the aid Tunxi -Wenzhou sections and the northeast Iine of Yongpin demolition seism, we have calculated the MoHo plane of the whole province again. It was provesd that the deep structure of Zhejiang is three-upheaval and two-hollow. The difference of depth between the north and the south is about 4 km. Crust' depth is direct analogy with gravity in thr west of Zhejiang, and it is reverse analogy in the coastal aresa. In another aspect, this has disproved the difference of the upper mantle' structure and the material composition between the west of Zhejiang and the east to Zhenhai-Wenzhou fault.With the binding conditions of the achievemints of Tunxi-Wenzhou and Zhuji-Linhai synthetical gecphysical sections, combining with the second time' information of gravity and magnetic, we have explained te basement structure of the whole province. This work has increased the scientific quality of the conclusion. |
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| Keywords: | geological section structure of crust MoHo plane rheosphere thickness of volcanic rock nappe structure fault |
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