伊朗Zagros - Alborz地区地壳形变和厚度变化:H-κ-c方法的新认识

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Mohsen Azqandi , Mohammad Reza Abbassi , Meysam Mahmoodabadi , Esmaeil Shabanian , Ahmad Sadidkhouy
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引用次数: 0

摘要

阿拉伯和欧亚大陆之间的碰撞对伊朗高原产生了重大影响,使其成为研究地壳变形的最佳地点。新生代新特提斯洋的闭合和随后的碰撞导致了伊朗高原北部的广泛变形,特别是阿尔伯尔斯山脉的发育。在这项研究中,我们的目标是确定地壳厚度和方位各向异性参数,以深入了解该地区的地壳变形模式。采用H-κ-c方法(Li et al., 2019),研究了地震各向异性对26个地震台站地壳厚度(H)和Vp/Vs比值(κ)估算的影响。我们的分析揭示了整个研究地区莫霍深度的显著差异。与伊朗中部相比,碰撞区具有更深的莫霍深度。特别是,伊朗中部地区地壳相对较薄,平均莫霍深度为43公里,而sanandaji - sirjan地区地壳较厚,莫霍深度为59公里。奥尔布尔斯山脉显示莫霍的平均深度为50公里。值得注意的是,伊朗中部台站的κ值升高,可能归因于流体含量和较厚的沉积覆盖。为了表征地壳的各向异性特性,我们采用曲线拟合技术对源自莫霍和主要地壳内界面的ps转换相的正弦移动进行了拟合。我们的分析确定了7个站点的地壳内部不连续,表明存在两个不同的各向异性地壳层。这些各向异性层显示最大延迟时间高达0.6 s。此外,我们对地壳和地幔各向异性模式的研究表明,在该地区观测到的变形不能仅仅归因于垂直相干状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Crustal deformation and thickness variation from Zagros to Alborz in Iran: New insights from H-κ-c method

Crustal deformation and thickness variation from Zagros to Alborz in Iran: New insights from H-κ-c method

The collision between Arabia and Eurasia has had a significant impact on the Iranian plateau, making it a prime location for investigating crustal deformation. The Neotethys Ocean closure and subsequent collision during the Cenozoic era led to extensive deformation in the northern part of the Iranian plateau, in particular development of the Alborz mountain range. In this study, we aim to determine crustal thickness and azimuthal anisotropic parameters in order to gain insights into the patterns of crustal deformation in the region. Using the H-κ-c method (Li et al., 2019), we conducted an investigation into the impact of seismic anisotropy on the estimation of the crustal thickness (H) and Vp/Vs ratio (κ) at 26 seismic stations. Our analysis unveiled significant variations in Moho depth across the studied region. The collisional zones featured a deeper Moho depth when compared to Central Iran. In particular, the Central Iran region demonstrated a relatively thinner crust, characterized by an average Moho depth of 43 km, while the Sanandaj-Sirjan zone showcased a thicker crust, boasting a Moho depth of 59 km. The Alborz mountain ranges demonstrated an average Moho depth of 50 km. Notably, the Central Iran stations exhibited elevated κ values, potentially attributable to fluid contents and thick sedimentary cover. To characterize the anisotropic properties of the crust, we employed curve fitting techniques on the sinusoidal moveouts of the Ps-converted phases originating from the Moho and major intracrustal interfaces. Our analysis identified intracrustal discontinuities at seven stations, indicating the presence of two distinct anisotropic crustal layers. These anisotropic layers displayed maximum delay times of up to 0.6 s. Furthermore, our examination of crustal and mantle anisotropy patterns revealed that the deformation observed in the region cannot be solely attributed to a vertically coherent regime.

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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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