华夏块体与江南造山带北部SKS分裂研究

doi:10.12196/j.issn.1000-3274.2025.01.008

摘要/Abstract

摘要： 华夏块体与江南造山带位于活动性大陆边缘, 其区域岩石圈变形模式对于研究太平洋和菲律宾海板块俯冲欧亚大陆有着重要意义。 SKS波各向异性可以指示上地幔物质变形或流动的方向, 是研究岩石圈深部变形的有效手段。基于浙江省内23个固定台站的远震波形, 进行剪切波的分裂测量, 分析华夏块体与江南造山带北部不同地块的各向异性特征。结果显示, 长江中下游成矿带SKS分裂平均快波方向为70.0°, 平均分裂时间0.58 s; 造山带东南部SKS分裂平均快波方向为-60.7°, 分裂时间平均0.89 s; 华夏地块SKS分裂平均快波方向为-65.0°, 分裂时间平均0.90 s。据此认为, 浙江境内长江中下游成矿带的上地幔沿成矿带平行流动, 华夏地块与江南造山带东南部地幔沿NW—SE至NWW—SEE向流动; 江南造山带与华夏地块的深部边界位于钦杭结合带内, 相较地表的边界江绍断裂靠近扬子地块。

关键词: 各向异性, 剪切波分裂, 华夏地块, 扬子地块, 江南造山带

Abstract: Cathaysian Block and Jiangnan Orogenic Belt are located on the active continental margin, and the deformation mode of the lithosphere in this region is of great significance for studying the subduction of the Pacific Sea and Philippine Sea Plates into Eurasia. The anisotropy of SKS waves to indicate the direction of material flow in the upper mantle is a powerful means to study the deformation of the deep lithosphere. Based on the teleseismic waveforms from 23 fixed stations in Zhejiang Province, shear wave splitting measurements were conducted to analyze the anisotropic characteristics of different blocks in the Cathaysian Block and the northern part of the Jiangnan Orogenic Belt. The results showed the fast polarization of the middle and lower reaches of the Yangtze River Metallogenic Belt is 70.0°, with a splitting time of 0.58 s; the fast polarization of the southeastern part of the orogenic belt is -60.7°, with a splitting time of 0.89 s; the fast polarization of the Cathaysian Block is -65.0°, with a splitting time of 0.90 s. The study suggests that the mantle under the middle and lower reaches of the Yangtze Metallogenic Belt flows parallel to the metallogenic belt. The mantle under the southeastern part of the Cathaysian Block and Jiangnan Orogenic Belt flows along NW—SE to NWW—SEE. The deep boundary between the Jiangnan Orogenic Belt and Cathaysian Block is likely located in the Qin-Hang Junction Zone, which is closer to the Yangtze block.

Key words: Anisotropy, Shear wave splitting, Cathaysian Block, Yangtze Block, Jiangnan Orogenic Belt

中图分类号:

P315.7

沈胜意. 华夏块体与江南造山带北部SKS分裂研究[J]. 地震, 2025, 45(1): 111-129.

SHEN Sheng-yi. The Study of the SKS Wave Splitting in the North of Cathaysian Block and Jiangnan Orogenic Belt[J]. EARTHQUAKE, 2025, 45(1): 111-129.

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