1、17 5 2010 M9 -(Sv();v)Earth Science Frontiers (China University of Geosciences(Beijing); Peking University)Vol.17 No.5Sep. 2010l :2010 07 06; :2010 08 03 “:SE$?Z9/ 9730 “(2009CB421001);SE1 S “(40872140, 40921062);n79 “(B07011)Te: (1963) ), 3,p V, q,p V 3 =,V Y/TbE-mail: C s T:/M / 颜丹平1,2, 李书兵3, 曹文涛2
2、, 张维宸411V SE L i; F /a V#/ L i,10008321Sv() o S,10008331S F“zK 2 s 7?, +61008141SSr6,101149Yan Danping1,2, Li Shubing3, Cao Wentao2, Zhang Weichen411 State Key Laboratory of Geological Processes and Mineral Resources; Key Laboratory of Lithospheric Tectonics and LithoprobingTechnology of Ministry of
3、 Education, Beijing 100083, China21 Schoolof EarthSciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China31 Explorationand Development Institute, Southwest Oil and Gas Branch, ChinaPetroleum and thus, they could not furnish a comprehensive under-standing. This paper r
4、eports a comprehensive structural section across the Pengguan complex and Xuelongbaopluton, which are themajor tectono-petrological units generating the 5. 12 Wenchuan earthquake, and re-inter-prets the geophysical data published by previous studies. We conclude that a detachment fault at a depth of
5、 10 km separated the in-sequence duplex imbricated thrust in the shallow tectonic level, whilethe rigid base-ment of the YangtzeBlock northwestward wedged into the middle to lower crustal ductilechannel, which pro-duced mult-i layer detachment crustal structure. The upper layer of the ductile channe
6、l flow pushed and rup-tured thePengguan complex and Xuelongbao pluton, which resulted in theoccurrence of 5.12 Wenchuan earth-quake.Key words: Longmen Mountains; mult-i layer crustal structure; crustal ductilechannel flow; imbricated thrustK 1:2008年5112汶川地震发生后,对于龙门山地壳结构及其与汶川地震的成生联系成为构造地质学研究极为关注的科学问题
7、b然而,现有的多种龙门山地壳结构模式在综合解释表层构造变形及深部构造时与调查和探测资料均有不符b利用前人地球物理探测成果,结合穿过龙门山主要发震构造单元彭灌杂岩及雪隆包 , a,!,/ 地学前缘 (Earth ScienceFrontiers)2010, 17 (5) 107 岩体的综合构造剖面,将地表构造与深部地壳探测资料结合进行了综合解释,认为龙门山逆冲构造带中的多重冲断推覆构造由约10 km深处的拆离断层分隔,因而应该只是浅层次构造变形的组合样式;在中a下地壳韧性流壳层的主导下,扬子地块基底被动揳入并形成多层拆离的韧性流变构造组合b51 12汶川地震及余震是由于以彭灌杂岩和雪隆包岩体为代
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11、,S i,. C “) 3MMT: )+/ 3 %Z r / T TJ. -, 2008, 15(3): 186-198.12 , , X ,.+ C sM+J., 2007, 81(8): 1072-1080.30 + . + 8 u M.:, 1991: 680.32 V, , ,. )+/ / VM.:, 1992: 137.43 , ,S i,.5 g vMMT# )+/ r Til J., 2008,82: 464-474.50 , M,. C I /vHTJ. v:1 S, 2008, 35:398-403.对5透岩浆流体成矿作用导论6新书的评介杜乐天100029 v q 5i 8
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