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dislocation structure of the crust-mantle boundary and low-velocity body within the crust beneath the dabie Shan collision orogen

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Science China Earth Sciences 2005年第7期48卷 875-885页

作者： LIU Qiyuan1, Rainer Kind2. CHEN Jiuhui1, YUAN Xiaohui2. LI Shuncheng1, GUO Biao1, Kurt Wylegalla2.& LAI Yuangen1 1. State Key Laboratory of Earthquake dynamics, Institute of Geology, China Earthquake Administration, Beijing 10002., China 2. geoforschungzentrum potsdam, telegrafenburg a17, {2., d-14.73, germany State Key Laboratory of Earthquake dynamics Institute of Geology China Earthquake Administration Beijing 100029 China geoforschungzentrum potsdam Telegrafenburg A17 Potsdam D-14473 Germany

From April of 2.01 to March of 2.02. a passive seismic array experiment was car- ried out in the dabie Shan and its adjacent region. In this experiment, totally 34 broadband seismic stations were deployed along a profile across the dabie Shan orogen and North-China platform. This profile is about 500 km long from Cuilin (34°40′N, 114°49′E), Henan Province, to dajipu (30°2.′N, 115°03′E), Hubei Province. The space between stations is about 3?8 km in the dabie Shan orogenic belt and about 15?2. km in other area. The receiver function profile and S-wave velocity structure of the crust and upper mantle down to 100 km depth along the profile are investigated in terms of the receiver function techniques (Liu et al., 1996, 2.00). Our results show that the crust beneath the dabie Shan orogen has an obviously asymmetric blocked structure in the direction perpendicular to the mountain strike. The maximal crustal thickness reaches to 42.km. The crust-mantle boundary has a dislocation structure correlated to the crustal blocks and the largest offset reaches to 8 km. In the kernel of the orogen exists a low-velocity body inside the crust, which is separated into two parts corresponding to the South dabie and North dabie on the surface, respectively. Probably a vertical divergent movement between both took place in history. The crust below this low-velocity area has a positive gradient velocity structure with the depth, and the upper mantle down to the depth of 70 km has the lower S-wave velocity than its both sides. Beneath the dabie Shan, however, a high-velocity anomaly exists in the upper mantle below 70 km.

关键词： receiver function low-velocity body Moho discontinuity dabei Shan collision orogen.

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