Constraining the crustal structure of the southern segment of the north-south gravity lineament by the receiver function H-κ-c method

doi:10.13745/j.esf.sf.2023.7.31

Abstract

Abstract:

The north-south-oriented Daxing’an-Taihangshan-Wulingshan Gravity Lineament, which is across the whole Mainland China is considered the most important intra-continental gravity gradient belt in East China. Data used in this study were from 43 permanent and 10 portable broadband seismic stations near the Wulingshan Gravity Lineament. A total of 12739 teleseismic P-wave receiver functions (pRFs) were calculated, and pRFs from 7 and 46 stations were then stacked using respectively the H-κ and H-κ-c methods. Combining previous studies, we obtained the lateral variation of the crustal thickness, average crustal v_P/v_S ratio and crustal anisotropy beneath the study region. The crustal thickness varied greatly, between 30-52 km, where the thickest crust was found under the Daba Mountain area and the thinnest to the east of the Xuefeng Mountain. Our results also showed the maximum gradient of the Moho interface traced from the Qinling-Dabashan Mountain in the north along the junction area between the Jianghan Basin and the Wuling uplift, and extended southward to the north of the Jiangnan orogenic belt. The high v_P/v_S ratio (>1.81) are generally distributed in the area west of the Wulingshan Gravity Lineament, while to the east the v_P/v_S ratio are lower than (<1.75) and so did the Jiangnan orogenic belt. Similar differences in crustal anisotropy were found between the two sides of the Wulingshan Gravity Lineament, where the fast polarization directions (FPDs) on the east side is nearly E-W while on the west side nearly NE-SW. Finally, we inferred a common occurrence of lower crustal delamination near the Wulingshan Gravity Lineament and areas to the east.

Key words: Wulingshan Gravity Lineament, receiver function, H-κ-c method, crustal structure

CLC Number:

P315.2

MU Qing, HUANG Rong, YAN Jiayong, LU Zhanwu, LUO Yinhe, ZHANG Yongqian, JIANG Xiaohuan, WEN Hongbin, WEI Penglong, ZHOU Wanli. Constraining the crustal structure of the southern segment of the north-south gravity lineament by the receiver function H-κ-c method[J]. Earth Science Frontiers, 2023, 30(5): 369-383.

Figures/Tables 10

Fig.1 Basic information. (a) Tectonic setting of southern China and location of the study area. (b) Distribution of seismic stations. (c) Distribution of teleseismic events in East Asia.

Fig.2 The harmonic fitting results of converted PS phase (left) and two multi-phases (M1/M2, middle/right) for CQ_CHK station

Fig.3 Comparison of stacking results before (a, b, c) and after (d, e, f) harmonic fitting correction for CQ_CHK station. where the red lines and red triangles mark the reference arrivals (from left to right) of PS, M1 and M2 phases, respectively.

Fig.4 Comparison of our results with previous studies from [19-20,23,27,35]. (a) Statistics of the Moho converted PS arrivalsfrom different H-κ stacking studies, where the gray histograms show the standard variance among all results;(b) and (c) represent comparison analysis of crustal thickness (H) and vP/vS ratio (κ), separately,where the solid line and dashed lines indicate reference line and 5 km (H) and 0.1 (κ) variances, respectively.

Fig.5 Histograms of standard deviation of H-κ stacking results before and after harmonic fitting corrections. (a) Crustal thickness. (b) vP/vS ratio.

Fig.6 Crustal thickness results for the study area. (a) Crustal thickness map after interplate calibration. Squares indicate negative corrections and circles positive corrections; bold gray line indicates abrupt change in Moho depth. (b) Thickness values by individual stations from ours and previous studies adapted from [22-23,38].

Fig.7 vP/vS ratio results for the study area. (a) Variation of vP/vS ratio after interplate calibration. See Fig.6 for more detail. (b) vP/vS ratio values by individual stations from ours and previous studies adapted from [22-23,38].

Fig.8 Moho interface map of the study area showing the degree of interface tilting (a) and crustal anisotropy (b-d) beneath individual stations

Fig.9 Correlation analysis between crustal thickness and average crustal vP/vS ratio

Fig.10 Correlation analysis between variables. (a) Altitude and crustal thickness; (b) Bouguer Gravity anomaly and crustal thickness; (c) altitude and vP/vS ratio; (d) Bouguer Gravity anomaly and vP/vS ratio.

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