下地壳流变对斜向延伸过程中地表变形的作用:沙箱建模的启示

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tectonics Pub Date : 2024-08-02 DOI:10.1029/2024tc008365
Yuqiong Mao, Yiquan Li, Dong Jia, Xianyan Wang, Yingying Chen, Qin Li, Rui Li
{"title":"下地壳流变对斜向延伸过程中地表变形的作用:沙箱建模的启示","authors":"Yuqiong Mao, Yiquan Li, Dong Jia, Xianyan Wang, Yingying Chen, Qin Li, Rui Li","doi":"10.1029/2024tc008365","DOIUrl":null,"url":null,"abstract":"Extensive researches have been conducted on the relationship between surface deformation and the properties of upper crust. However, the link between surface deformation and lower crustal rheology, especially in a three-dimensional context, remains unclear. In this study, we utilize sandbox modeling to investigate the impact of lower crustal rheology on surface deformation during oblique extension. Under the same conditions, six models with different lower crustal viscosities, both with and without syn-kinematic deposits, are conducted. The results indicate that a decrease in lower crustal viscosity may contribute to an increase in: (a) graben width, (b) graben length, (c) graben spacing, (d) the number of isolated rifts and (e) topographic relief of oblique extensional systems, while also leading to a reduction in the total number of grabens. Notably, there exists a negative linear correlation between graben spacing and lower crustal viscosity. In map view, the angle between fault strike and the direction of pre-existing discontinuities increases as the viscosity of the lower crust decreases. Furthermore, the frequency of large rakes (>50°) decreases with decreasing lower crustal viscosity. These findings align with natural examples such as the East African Rift System, Weihe Graben and the South Tibetan Rift in terms of geomorphology, tectonics, and crustal rheology. Through a comprehensive comparison of the graben width, spacing, and the angle between fault strike and the direction of pre-existing discontinuities, our study provides valuable insights into the rheology of the lower crust in natural settings.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":null,"pages":null},"PeriodicalIF":3.3000,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Role of Lower Crustal Rheology on Surface Deformation During Oblique Extension: Insights From Sandbox Modeling\",\"authors\":\"Yuqiong Mao, Yiquan Li, Dong Jia, Xianyan Wang, Yingying Chen, Qin Li, Rui Li\",\"doi\":\"10.1029/2024tc008365\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Extensive researches have been conducted on the relationship between surface deformation and the properties of upper crust. However, the link between surface deformation and lower crustal rheology, especially in a three-dimensional context, remains unclear. In this study, we utilize sandbox modeling to investigate the impact of lower crustal rheology on surface deformation during oblique extension. Under the same conditions, six models with different lower crustal viscosities, both with and without syn-kinematic deposits, are conducted. The results indicate that a decrease in lower crustal viscosity may contribute to an increase in: (a) graben width, (b) graben length, (c) graben spacing, (d) the number of isolated rifts and (e) topographic relief of oblique extensional systems, while also leading to a reduction in the total number of grabens. Notably, there exists a negative linear correlation between graben spacing and lower crustal viscosity. In map view, the angle between fault strike and the direction of pre-existing discontinuities increases as the viscosity of the lower crust decreases. Furthermore, the frequency of large rakes (>50°) decreases with decreasing lower crustal viscosity. These findings align with natural examples such as the East African Rift System, Weihe Graben and the South Tibetan Rift in terms of geomorphology, tectonics, and crustal rheology. Through a comprehensive comparison of the graben width, spacing, and the angle between fault strike and the direction of pre-existing discontinuities, our study provides valuable insights into the rheology of the lower crust in natural settings.\",\"PeriodicalId\":22351,\"journal\":{\"name\":\"Tectonics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.3000,\"publicationDate\":\"2024-08-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Tectonics\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1029/2024tc008365\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tectonics","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1029/2024tc008365","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0

摘要

人们对地表变形与上地壳性质之间的关系进行了广泛的研究。然而,地表变形与下地壳流变之间的联系,尤其是三维背景下的联系,仍不清楚。在本研究中,我们利用沙箱模型研究了斜向延伸过程中下地壳流变对地表变形的影响。在相同的条件下,我们建立了六个不同下地壳粘度的模型,包括有和没有同步动力沉积的模型。结果表明,地壳下部粘度的降低可能会导致以下方面的增加:(a) 地堑宽度、(b) 地堑长度、(c) 地堑间距、(d) 孤立裂谷的数量和 (e) 斜伸系统的地形起伏,同时也会导致地堑总数的减少。值得注意的是,地堑间距与较低的地壳粘度之间存在负线性关系。从地图上看,随着下地壳粘度的降低,断层走向与原有不连续面方向之间的夹角也在增大。此外,随着下地壳粘度的降低,大耙齿(>50°)的频率也会降低。这些发现在地貌学、构造学和地壳流变学方面与东非大裂谷系统、渭河地堑和藏南断裂等自然实例相吻合。通过对地堑宽度、间距以及断层走向与原有不连续面方向之间角度的综合比较,我们的研究为了解自然环境下的下地壳流变学提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Role of Lower Crustal Rheology on Surface Deformation During Oblique Extension: Insights From Sandbox Modeling
Extensive researches have been conducted on the relationship between surface deformation and the properties of upper crust. However, the link between surface deformation and lower crustal rheology, especially in a three-dimensional context, remains unclear. In this study, we utilize sandbox modeling to investigate the impact of lower crustal rheology on surface deformation during oblique extension. Under the same conditions, six models with different lower crustal viscosities, both with and without syn-kinematic deposits, are conducted. The results indicate that a decrease in lower crustal viscosity may contribute to an increase in: (a) graben width, (b) graben length, (c) graben spacing, (d) the number of isolated rifts and (e) topographic relief of oblique extensional systems, while also leading to a reduction in the total number of grabens. Notably, there exists a negative linear correlation between graben spacing and lower crustal viscosity. In map view, the angle between fault strike and the direction of pre-existing discontinuities increases as the viscosity of the lower crust decreases. Furthermore, the frequency of large rakes (>50°) decreases with decreasing lower crustal viscosity. These findings align with natural examples such as the East African Rift System, Weihe Graben and the South Tibetan Rift in terms of geomorphology, tectonics, and crustal rheology. Through a comprehensive comparison of the graben width, spacing, and the angle between fault strike and the direction of pre-existing discontinuities, our study provides valuable insights into the rheology of the lower crust in natural settings.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Tectonics
Tectonics 地学-地球化学与地球物理
CiteScore
7.70
自引率
9.50%
发文量
151
审稿时长
3 months
期刊介绍: Tectonics (TECT) presents original scientific contributions that describe and explain the evolution, structure, and deformation of Earth¹s lithosphere. Contributions are welcome from any relevant area of research, including field, laboratory, petrological, geochemical, geochronological, geophysical, remote-sensing, and modeling studies. Multidisciplinary studies are particularly encouraged. Tectonics welcomes studies across the range of geologic time.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信