祁连山中部地壳各向异性研究:来自远震接收函数的证据

doi:10.13745/j.esf.sf.2022.4.23

地学前缘 ›› 2022, Vol. 29 ›› Issue (4): 265-277.DOI: 10.13745/j.esf.sf.2022.4.23

所属专题：印度-欧亚大陆碰撞及其远程效应

• “印度-欧亚大陆碰撞及其远程效应”专栏之五 • 上一篇下一篇

祁连山中部地壳各向异性研究:来自远震接收函数的证据

周鹏哲¹(), 高锐¹^,², 叶卓³^,^*()

1.中山大学地球科学与工程学院, 广东广州 510275
2.南方海洋科学与工程广东省实验室(珠海), 广东珠海 519080
3.中国地质科学院地球深部探测中心, 北京 100037

收稿日期:2022-03-31 修回日期:2022-04-21 出版日期:2022-07-25 发布日期:2022-07-28
通信作者: 叶卓
作者简介:周鹏哲(1997—),男,硕士研究生,主要从事远震接收函数研究。E-mail: zhoupzh3@mail2.sysu.edu.cn
基金资助:
国家自然科学基金项目(42074106);国家自然科学基金项目(41704092);国家自然科学基金项目(41874102)

Crustal anisotropy study in the central Qilian Mountains: Evidence from teleseismic P wave receiver functions

ZHOU Pengzhe¹(), GAO Rui¹^,², YE Zhuo³^,^*()

1. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2. Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai), Zhuhai 519080, China
3. Sinoprobe Center, Chinese Academy of Geological Sciences, Beijing 100037, China

Received:2022-03-31 Revised:2022-04-21 Online:2022-07-25 Published:2022-07-28
Contact: YE Zhuo

摘要/Abstract

摘要：

青藏高原的隆升由印度-欧亚板块的碰撞而驱动,其生长演化,特别是从内到外的扩展机制仍尚存争议。祁连山地处青藏高原向东北扩展的前缘位置,其地壳结构与各向异性对于理解青藏高原向北扩展的生长机制具有重要意义。祁连山中部是青藏高原东北缘地壳遭受挤压强烈变形的区域,已有的研究已经揭示出地壳内部非耦合不均匀变形的几何行为,揭露其对应机制是亟待探索的前沿科学问题。此前该区域的各向异性研究大多基于面状台网数据,台站间距大,无法反映横跨祁连山地壳各向异性的精细变化。为此,本研究选用一条密集线性地震台阵,使用H-κ-c叠加方法,得到了横过祁连山中部的地壳厚度,泊松比以及地壳各向异性的横向变化。结果显示,在中祁连以及南祁连北部地壳厚度最大,平均泊松比最低,反映了地壳加厚过程中铁镁质下地壳的丢失以及长英质中上地壳的水平缩短。此外,偏长英质成分的泊松比值也不支持地壳流在该区域存在。在祁连山内部,地壳各向异性快波的偏振方向与地壳向外扩展方向一致,而与地幔各向异性快波方向近垂直,揭示了壳幔变形可能是解耦的。而在地壳较薄的南祁连和北祁连南部区域,快波方向与古缝合线的走向一致,说明早古生代的构造格局仍对现今的祁连山缩短隆升产生影响。

关键词: 祁连山, 地壳各向异性, 接收函数, H-κ-c叠加

Abstract:

The Tibetan Plateau uplift is driven by the collision between the Indian and Eurasian plates. Its growth and evolution, especially the mechanism of its outward expansion, is still controversial. At the forefront of its northeastward expansion lies the Qilian Mountains, whose crustal structure and anisotropy are of great significance for understanding the northward growth of the Tibetan Plateau. The central Qilian Mountains on the northeastern margin of the Tibetan Plateau experienced strong crustal compressional deformation. Existing studies have described phenomenons of non-coupling non-uniform deformations of crust and upper mantle, while understanding the deformation mechanism has become a frontier scientific issue. Previous anisotropy researches in this region mostly relied on seismic network data using large station spacing, however, which could not reflect the fine changes in the crustal anisotropy across the mountain range. To solve this problem, this study used the stacking method based on a dense linear seismic array to obtain the lateral variation of the crustal thickness, Poisson’s ratio and crustal anisotropy. The crust was found to be at its thickest in the Central Qilian and northern South Qilian, while the average Poisson’s ratio was the lowest in these areas, indicating loss of mafic lower crust and shortening of felsic upper-middle crust during crustal thickening. In addition, the Poisson’s ratio of felsic component did not support the existence of crustal flow in this region. In the interior of the mountain range, the fast polarization directions (FPDs) of the crust followed the direction of crustal outward expansion and were nearly perpendicular to the FPDs of the upper mantle, suggesting the crust-mantle deformation might be decoupled. In southern South Qilian and southern North Qilian where the crust is thinner, FPDs were parallel to the strike of the ancient suture, indicating the Early Paleozoic tectonic frame still had an impact on the shortening and uplifting of the Qilian Mountains.

Key words: Qilian Mountain, crustal anisotropy, receiver function, stacking

中图分类号:

P631.4
P542

周鹏哲, 高锐, 叶卓. 祁连山中部地壳各向异性研究:来自远震接收函数的证据[J]. 地学前缘, 2022, 29(4): 265-277.

ZHOU Pengzhe, GAO Rui, YE Zhuo. Crustal anisotropy study in the central Qilian Mountains: Evidence from teleseismic P wave receiver functions[J]. Earth Science Frontiers, 2022, 29(4): 265-277.

图/表 7

图1 研究区地质构造及台站位置分布图(据文献[40-41]补充修改) 三角形代表宽频地震台站的位置。其中,灰色三角形代表不满足H-κ-c叠加方法所要求的地震事件反方位角覆盖台站的位置;蓝色三角形代表H-κ-c叠加结果异常台站的位置。断裂简称:YMSF—榆木山断裂;NQLF—祁连山北缘断裂;HYF—海原断裂;RYSF—日月山断裂;ELSF—鄂拉山断裂;KLF—昆仑断裂;ATF—阿尔金断裂。缝合带简称:SQS—南祁连缝合带;DNS—党河南山缝合带;NQS—北祁连缝合带。右上图显示本次研究用来提取接收函数的远震事件。左下图用黄色方框在青藏高原数字高程图上标出研究区所在位置。

Fig.1 Topographic map of the study area showing major tectonic feature and distribution of stations. Modified after [40-41].

图2 台站QL17的H-κ-c叠加结果针对PS转换波(a)、M1多次波(b)和M2多次波(c)的谐波拟合结果展现了拟合曲线、搜索谐波参数的能量叠加图和汇总的搜索结果。谐波校正前后的H-κ叠加结果如图(d),(e)所示。

Fig.2 H-κ-c stacking results on station QL17

图3 谐波校正前(灰)后(白)地壳厚度与波速比的误差分布直方图

Fig.3 Histograms of the errors (standard deviation) of crustal thickness and velocity ratio before (grey) and after (white) harmonic corrections

图4 地壳厚度沿纬度的变化黑色误差棒为H-κ-c叠加方法所得到的地壳厚度,灰色误差棒为H-κ叠加方法所得到的地壳厚度。其中,蓝色误差棒代表H-κ-c叠加方法所得结果存在异常的台站;红色和蓝色十字分别在台站叠加接收函数上标注着由H-κ-c叠加方法,H-κ叠加方法计算得到的地壳厚度和波速比代入公式(2)中得到的PS转换波到时。

Fig.4 The variation of crustal thickness with altitude

图5 地壳波速比沿纬度的变化黑色误差棒为H-κ-c叠加方法所得到的地壳波速比;灰色误差棒为H-κ叠加方法所得到的地壳波速比。其中,蓝色误差棒代表H-κ-c叠加方法所得结果存在异常的台站。

Fig.5 The variation of crustal velocity ratio with altitude

图6 PS转换波经过谐波拟合所得分裂参数分布图(据文献[18,36-37,57-58]补充修改) 红色短棒代表本研究所得到的分裂参数;紫色短棒代表前人所得结果[18,36-37,57]。由棕色箭头指示相对于欧亚大陆的GPS速度场[58]。黑色粗箭头代表来自MORVEL模型的板块绝对运动(APM)方向[59]。

Fig.6 Splitting parameters obtained by harmonic fitting of PS converted wave. Modified after [18,36-37,57-58].

图7 地壳厚度与波速比的相关性分析图自下到上颜色逐渐变深的4个区域分别代表泊松比值σ<0.26,0.26≤σ<0.28,0.28≤σ<0.30以及σ≤0.30。白色圆点为被排除在相关性分析之外的数据点。

Fig.7 The correlation analysis of the crustal thickness and Poisson’s ratio

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祁连山中部地壳各向异性研究:来自远震接收函数的证据

Crustal anisotropy study in the central Qilian Mountains: Evidence from teleseismic P wave receiver functions

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