Crustal structure in eastern areas of South China block based on P-wave receiver functions
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摘要:
华南大陆是由扬子块体和华夏块体拼合而成，并经历了多期次的后期改造，研究块体间的深部结构差异对于理解华南大陆的构造演化历史具有重要意义.本文基于布设在华南大陆东部的流动宽频带地震台阵资料，计算了远震事件的P波径向接收函数，并利用Pms谐波分析方法获得了地壳各向异性分布.结果显示，研究区地壳各向异性具有明显的横向分段特征.JSF（江绍断裂带）附近与断裂带走向一致的地壳各向异性快波方向指示断裂带可能切穿整个地壳.在大别造山带、扬子块体和华夏块体南部，地壳各向异性快波方向与区域主压应力方向近垂直，指示该区域地壳变形可能受菲律宾海板块俯冲和太平洋板片俯冲后撤的远程效应的影响.此外，本文利用新的H-κ-c叠加方法获得了测线下方地壳厚度及平均波速比.结果显示，扬子块体的地壳厚度薄于两侧的华夏块体和大别造山带，速度比也较低（约1.7），指示地壳以长英质和酸性岩石为主.Airy地壳均衡理论预测的地壳厚度指示29°N以南的地壳密度要低于以北的区域.以南的低密度及低波速比可能与菲律宾海板块北西向俯冲和太平洋板块西向俯冲后撤导致的地壳物质垂向分异拆沉有关.
Abstract:The South China block is composed of the Yangtze block and Cathaysia block and has undergone several stages of late transformation. It is of great significance to study the deep structural differences among the blocks for understanding the tectonic evolution history of the South China block. Based on the data of the broadband seismic array located in the eastern South China block, we calculated the P-wave radial receiver functions, and obtained the crustal anisotropy based on the Pms harmonic analysis. The results show that the crustal anisotropy of the seismic array has obvious regional characteristics. The fast wave directions near JSF (JiangShao fault) are consistent with the strike of the fault, indicating that the JSF may cut through the entire crust. In the Qinling-Dabie orogenic belt, the Yangtze block and the southern Cathaysia block, the fast wave directions are nearly perpendicular to the regional principal compressive stress direction, reflecting that the crustal deformation in this region may be influenced by the remote effect of subduction of the Philippine Sea plate and the Pacific plate. We also measured the crustal thickness and the average VP/VS ratio using H-κ-c stacking method. The crustal thickness of the Yangtze block is thinner than that of the Cathaysia block and the Qinling-Dabie orogenic belt with lower VP/VS ratios of approximately 1.7, which indicates that the crust is dominated by felsic and acidic rocks. The crustal thickness obtained by Airy isostasy theory shows that the crustal density is lower in the south of 29°N than that in the northern regions. The low density and low VP/VS ratio in the south of 29°N may be related to the vertical differentiation and delamination of crustal material caused by the northwestward subduction of the Philippine Sea plate and the westward subduction and retreat of the Pacific plate.
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Key words:
- South China Block /
- Receiver functions /
- Crustal anisotropy /
- Crustal thickness /
- VP/VS ratio
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图 1
研究区构造背景及本文所用宽频带地震台站和地震事件分布
Figure 1.
Tectonic setting in the study area and the distribution of the broadband seismic stations and seismic events
图 5
整条测线下方地壳各向异性分裂时差(a)，快波偏振方向(b)，(c)H-κ-c分析中谐波校正后各台站的叠加接收函数，地壳厚度(d)和平均VP/VS值(e)
Figure 5.
The anisotropic parameters of splitting time (a), the fast polarization directions (b), (c) stacked receiver functions at each station after the harmonic correction in the H-κ-c analysis, the crustal thickness (d), and the average VP/VS values (e)
表 1
研究区各台站下方地壳厚度、波速比和各向异性参数
Table 1.
Crustal thickness, VP/VS ratio and anisotropy parameters under each station in the study area
构造区 台站 经度(°) 纬度(°) 地壳厚度(km) 波速比 φ(°) δt(s) 大别造山带 9C74 115.36 30.88 35.4±1.5 1.74±0.04 175 0.4 9A80 115.41 30.71 34.0±2.0 1.77±0.05 135 0.1 9BFF 115.46 30.57 33.0±2.8 1.75±0.05 - - 9C85 115.51 30.46 33.5±2.0 1.74±0.04 150 0.4 B394 115.52 30.36 32.6±2.3 1.73±0.05 170 0.06 9BFA 115.50 30.29 32.5±2.1 1.73±0.05 105 0.1 9A0D 115.50 30.17 32.5±3.0 1.73±0.06 - - 9B19 115.54 30.08 32.9±1.7 1.73±0.05 110 0.06 扬子块体 9B6C 115.45 29.96 32.0±1.9 1.80±0.05 150 0.3 9A48 115.47 29.89 31.0±4.5 1.81±0.05 100 0.3 B554 115.45 29.75 32.4±2.2 1.78±0.05 130 0.2 9B8F 115.47 29.63 33.1±2.4 1.81±0.05 160 0.46 B55A 115.48 29.52 34.5±1.1 1.68±0.03 170 0.45 sp06 115.52 29.40 30.0±2.3 1.78±0.05 80 0.14 sp05 115.52 29.29 32±1.2 1.75±0.04 115 0.45 sp04 115.59 29.16 32±1.3 1.68±0.03 160 0.46 sp03 115.64 29.01 32±2.2 1.71±0.04 - - sp02 115.63 28.93 32±1.3 1.69±0.03 35 0.1 sp01 115.66 28.83 30±1.8 1.69±0.05 155 0.4 sc01 115.65 28.70 30.5±1 1.65±0.03 155 0.46 sc02 115.68 28.66 29.5±1.5 1.7±0.04 75 0.14 sc03 115.71 28.54 29.1±1.3 1.75±0.05 75 0.14 sc04 115.70 28.46 30±2.1 1.69±0.06 45 0.4 sc05 115.66 28.32 29±1.3 1.75±0.04 65 0.46 sc06 115.65 28.21 28.9±3.7 1.76±0.07 - - sc07 115.71 28.08 31.1±2.7 1.69±0.05 105 0.14 sc08 115.71 27.98 30.5±1.6 1.73±0.05 55 0.46 sc09 115.72 27.88 30.5±2.9 1.75±0.05 - - sc10 115.83 27.82 31.4±1.1 1.68±0.04 75 0.34 华夏块体 sc11 115.83 27.72 29.5±2.2 1.79±0.04 85 0.06 sc12 115.86 27.65 33.1±2.2 1.68±0.05 100 0.3 sc13 115.86 27.59 32.9±2.6 1.71±0.05 30 0.4 sc14 115.80 27.49 33.9±2.9 1.66±0.07 80 0.4 sc15 115.87 27.34 29.4±2.9 1.78±0.07 125 0.45 sc16 115.89 27.29 31.3±4.4 1.72±0.05 95 0.24 sc17 115.93 27.19 31.3±1 1.74±0.03 80 0.46 sc18 115.95 27.09 30.5±3.6 1.74±0.06 - - sc19 116.06 27.03 30.6±3.3 1.76±0.06 - - sc20 116.09 26.98 32±2.6 1.7±0.06 70 0.24 sc21 116.17 26.91 30.5±2.3 1.76±0.06 100 0.45 sc22 116.25 26.86 31.9±2.1 1.69±0.05 125 0.46 sc23 116.37 26.79 31.6±2.6 1.71±0.04 50 0.06(<0.1) sc24 116.39 26.73 30.5±1.9 1.76±0.05 125 0.45 sc25 116.49 26.65 32.1±1.7 1.71±0.04 90 0.34 sc26 116.54 26.59 33.5±3 1.69±0.05 80 0.46 sc27 116.65 26.56 32.5±1.6 1.73±0.06 90 0.45 sc28 116.71 26.49 32.5±2.7 1.73±0.07 75 0.46 sc29 116.75 26.41 33±3.4 1.71±0.05 - - C68 116.79 26.40 33.5±1.9 1.69±0.04 125 0.2 HN01 116.82 26.30 31±2 1.75±0.05 50 0.34 HN02 116.95 26.14 31.5±2.5 1.75±0.05 160 0.45 HN03 117.19 26.05 33.4±1.5 1.64±0.04 150 0.46 HN04 117.48 25.89 32±2.3 1.74±0.05 - - HN05 117.67 25.77 32±1.2 1.73±0.03 155 0.4 HN06 117.86 25.64 32.5±1.7 1.72±0.04 170 0.4 HN07 118.02 25.45 31.6±1.7 1.75±0.05 165 0.45 HN08 118.20 25.34 32.5±1.5 1.67±0.04 0 0.46 HN09 118.40 25.16 31.9±1.9 1.7±0.05 0 0.2 HN10 118.57 25.04 29.5±1.5 1.78±0.03 145 0.2 
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