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Crustal structure of Dabieshan orogenic belt |
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| Authors: | Chunyong Wang Xiankang Zhang Buyun Chen Xuebo Chen Songyan Song Jinhan Zheng Hongxiang Hu Hai Lou |
| Affiliation: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(2) Geophysical Prospecting Center, State Seismological Bureau, 450003 Zhengzhou, China;(3) Institute of Seismology, State Seisn~ological Bureau, 430071 Wuhan, China;(4) Institute of Geodynamics, State Seismological Bureau, 100085 Beijing, China |
| Abstract: | The crustal structures ofP velocity and density on the deep seismic sounding profile across the Ilabieshan orogenic belt are presented. There is a 5-km-thick crustal “root” between the Yuexi and Xiaotian where the elevation is highest on the profile. An apparent Moho offset of 4. 5 km beneath the Xiaotian-Mozitan fault marks the paleo-suture of the Triassic collision. A high-velocity anomaly zone at the depth below 3 km beneath the ultra-high pressure (UHP) zone may be correlated to the higher content of UHP metamorphic rocks. Project supported by the National Natural Science Foundation of China and the Joint Earthquake Science Foundation. |
| Keywords: | Dabieshan orogenic belt ultra-high pressure metamorphic belt crust and upper mantle structure deep seismic sounding profile |
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