| 深地震探测揭示的华北及东北地区莫霍面深度 |
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| 关键词:North and Northeast China seismic detection Moho depth peri-Pacific tectonism geodynamics |
| 基金项目:国家自然科学基金项目(编号: 40830316; 40874045); 科技部国际科技合作项目(编号: 2006DFA21340); 国土资源部公益性行业基金(编号: 200811021); 国土资源部科技创新项目(编号: 1212010711813); 深部探测与实验研究专项(编号: SINOPROBE-02); 地质所基本科研业务经费(编号：J0803; J0916) |
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| The Moho Depth of North China and Northeast China Revealed by Seismic Detection |
| Since the 1970s, lots of research work on deep seismic detection has been conducted in North China and Northeast China. In this paper, the authors have summarized the results of the detection work, and discussed the Moho variation in this region. It is shown that in North China, the deepest Moho is beneath the Mongolia fold belt (48 km) and the shallowest Moho is in Bohai bay basin (28 km), whereas in the Northeast China, the deepest Moho occurs under Da Hinggan Mountains region (42 km), and the shallowest Moho is under the Yilan-Yitong (YY) fault zone (27 km). The Da Hinggan Mountains-Taihang Mountain gradient zone is a remarkable Moho variation belt, with the Moho depth being ≥40 km to its west and ≤37 km to its east; the Moho depth is shallower than that of its both sides along the Tan-Lu fault belt and the YY fault belt, and the Moho offsets exist under the Dunhua-Mishan fault zone; under the regions with outcropped basement rocks, the Moho is deeper than that of the adjacent basins; the Moho obviously deepens at the mountain front. All these features suggest that North China and Northeast China must have experienced the peri-Pacific tectonism, and the Da Hinggan Mountains-Taihang Mountain gradient zone limited the influence range of this tectonism. |
| XIONG Xiao-song,GAO Rui,ZHANG Xing-zhou,LI Qiu-sheng,HOU He-sheng.2011.The Moho Depth of North China and Northeast China Revealed by Seismic Detection[J].Acta Geoscientica Sinica,32(1):46-56. |
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