利用接收函数H-κ-c叠加方法约束武陵山重力梯度带地壳结构

doi:10.13745/j.esf.sf.2023.7.31

地学前缘 ›› 2023, Vol. 30 ›› Issue (5): 369-383.DOI: 10.13745/j.esf.sf.2023.7.31

• “印度欧亚大陆碰撞及其远程效应”专栏之九 • 上一篇下一篇

利用接收函数H-κ-c叠加方法约束武陵山重力梯度带地壳结构

穆青¹^,²^,³(), 黄荣²^,³^,^*(), 严加永¹, 卢占武⁴, 罗银河²^,³, 张永谦¹, 姜小欢⁵^,⁶, 文宏斌¹^,²^,³, 魏鹏龙²^,³, 周万里²^,³

1.中国地质科学院自然资源部深地科学与探测技术实验室, 北京 100037
2.中国地质大学(武汉) 地球物理与空间信息学院, 湖北武汉 430074
3.中国地质大学(武汉) 地质过程与矿产资源国家重点实验室, 湖北武汉 430074
4.中国地质科学院地质研究所, 北京100037
5.武汉轻工大学土木工程与建筑学院, 湖北武汉 430023
6.中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室, 湖北武汉 430077

收稿日期:2023-07-20 修回日期:2023-07-28 出版日期:2023-09-25 发布日期:2023-10-20
通讯作者: 黄荣
作者简介:穆青(1996—),男,硕士,主要从事远震接收函数成像研究。E-mail: 1476020682@qq.com
基金资助:
自然资源部深地科学与探测技术实验室开放课题(202206);地质过程与矿产资源国家重点实验室科技部专项(MSFGPMR2022-4);大地测量与地球动力学国家重点实验室2022年基金项目(SKLGED2022-4-2);湖北巴东地质灾害国家野外科学观测研究站开放基金项目(BNORSG-202214)

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

MU Qing¹^,²^,³(), HUANG Rong²^,³^,^*(), YAN Jiayong¹, LU Zhanwu⁴, LUO Yinhe²^,³, ZHANG Yongqian¹, JIANG Xiaohuan⁵^,⁶, WEN Hongbin¹^,²^,³, WEI Penglong²^,³, ZHOU Wanli²^,³

1. SinoProbe Laboratory of Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2. School of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan 430074, China
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
4. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
5. School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China
6. State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China

Received:2023-07-20 Revised:2023-07-28 Online:2023-09-25 Published:2023-10-20
Contact: HUANG Rong

摘要/Abstract

摘要：

贯穿中国大陆南北的大兴安岭—太行山—武陵山重力异常梯度带被认为是东亚重要的岩石圈分界线,本文利用布设在武陵山重力梯度带的43个国家地震局固定台站和10个流动宽频台站的观测数据,采用远震P波接收函数方法,计算并挑选了共计12 739条高质量的远震P波接收函数,综合其中7个台站H-κ叠加和46个台站H-κ-c叠加的结果,并结合前人结果获得了研究区的莫霍(Moho)界面起伏形态以及地壳平均波速比(v_P/v_S)分布和通过H-κ-c叠加方法获得相应台站下方地壳各向异性。结果表明研究区地壳厚度在30~52 km之间,其中最厚的大巴山区域超过50 km,最薄的雪峰山以东地区仅约30 km,整体特征表现为西厚东薄。Moho界面梯度变化最大的区域,北起秦岭—大巴山东侧一带,沿着江汉盆地与武陵隆起的盆山耦合处,南至江南造山带中段北侧;地壳平均波速比整体的分布特点表现为:高值(>1.81)普遍分布在武陵山重力梯度带以西地区,而低值(<1.75)分布以东地区以及江南造山带内部;地壳各向异性同样在武陵山重力梯度带两侧存在明显差异,以东地区快波最大极化方向为近E-W向, 而以西地区则表现为 NE-SW 向。最后,我们推测武陵山重力梯度带附近及以东地区存在普遍的下地壳拆沉现象。

关键词: 武陵山重力梯度带, 接收函数, H-κ-c叠加, 地壳结构

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

中图分类号:

P315.2

穆青, 黄荣, 严加永, 卢占武, 罗银河, 张永谦, 姜小欢, 文宏斌, 魏鹏龙, 周万里. 利用接收函数H-κ-c叠加方法约束武陵山重力梯度带地壳结构[J]. 地学前缘, 2023, 30(5): 369-383.

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.

图/表 10

图1 (a)华南陆块构造背景图;(b)地震台站分布图;(c)P波接收函数远震事件分布图 DBS—大巴山;ESFZ—川东褶皱带;NXB—南襄盆地;JHB—江汉盆地;HYB—衡阳盆地;XFS—雪峰山;SNHL—神农—黄陵地体;WL Uplift—武陵隆起。红色三角型代表宽频流动台站;蓝色正方形代表宽频固定台站。

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.

图 2 CQ_CHK台站PS/M1/M2震相谐波最优拟合结果以PS震相拟合为例,从左到右、从上到下依次分别为谐波拟合曲线、A1与θ1网格搜索能量图、A1与A2网格搜索能量图、A2和θ2网格搜索能量图,最终确定拟合参数如右上角所示。baz—后方位角。

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

图3 台站CQ_CHK谐波拟合校正前后结果对比。(a)、(b)、(c)分别为谐波拟合校正前的接收函数、台站接收函数叠加波形、H-κ 网格搜索能量图和叠加搜索结果;(d)、(e)、(f)分别对应(a)、(b)、(c)谐波拟合校正后的结果 (a)、(d)中的红线从左到右代表谐波拟合PS、M1、M2震相的参考到时(或H-κ叠加结果到时),白色圆圈代表校正前后的震相拟合到时;(b)、(e)中的红色倒三角形从左到右分别表示H-κ网格搜索的PS、M1、M2震相到时;(c)、(f)中的白色椭圆表示网格搜索结果标准差范围的能量分布。

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.

图4 与前人研究结果对比。(a)为H-κ叠加的PS到时统计,台站所对应的灰色柱状图代表不同研究通过H-κ叠加得到的PS到时标准差统计;(b)和(c)为H-κ-c叠加与H-κ叠加扫描得到的地壳厚度(H)和波速比(κ)对比(数据来自[19-20,23,27,35]) 实线代表H-κ-c叠加得到的结果,虚线之间分别为地壳厚度偏差小于5 km、波速比偏差小于0.1拟合参考到时的准确性。

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.

图5 谐波拟合校正前后H-κ搜索结果的标准差统计图。(a)为地壳厚度校正前后标准差对比;(b)为地壳平均波速比(vP/vS)校正前后标准差对比

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

图6 研究区地壳厚度分布图。(a)为插值后的地壳厚度分布和台站所对应的地壳厚度校正量,图中灰色条带为Moho界面陡变带;(b)为研究区域台站对应的地壳厚度(前人研究得到的地壳厚度来自文献[22-23,38])

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].

图7 研究区地壳波速比分布图。(a)为插值后的地壳平均波速比分布及台站所对应的波速比校正量;(b)为研究区域台站对应的地壳平均波速比(前人研究得到的波速比来自文献[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].

图8 研究区Moho界面倾斜程度和地壳各向异性

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

图9 地壳厚度与地壳波速比的依赖关系

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

图10 地表地形、布格重力异常分别与地壳厚度及地壳波速比的相关性

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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利用接收函数H-κ-c叠加方法约束武陵山重力梯度带地壳结构

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

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