globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228525
论文题名:
Three-dimensional magnetotelluric imaging of the SE Gonghe Basin: Implication for the orogenic uplift in the northeastern margin of the Tibetan plateau
作者: Gao J.; Zhang H.; Zhang H.; Zhang S.; Cheng Z.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 789
语种: 英语
中文关键词: Conductive layer in the middle crust ; Crustal shortening and orogenic uplift ; Gonghe Basin ; Magnetotelluric imaging ; Northeastern Tibetan plateau
英文关键词: Faulting ; Hot springs ; Magnetotellurics ; Springs (components) ; Topography ; Conductive layer ; Crustal shortening ; High conductivity ; High resistivity ; Magnetotelluric imaging ; Resistivity modeling ; Step discontinuity ; Threedimensional (3-d) ; 3D modeling ; crustal shortening ; decollement ; deformation mechanism ; electrical resistivity ; magnetotelluric method ; orogeny ; partial melting ; three-dimensional modeling ; thrust fault ; uplift ; upper crust ; China ; Gonghe Basin ; Qinghai ; Qinghai-Xizang Plateau
英文摘要: To better understand the upper crustal shortening and orogenic uplift in the northeastern margin of the Tibetan Plateau, we have utilized magnetotelluric (MT) data at 116 sites along two lines around the SE Gonghe Basin to determine a three-dimensional (3D) resistivity model by a 3D MT inversion package ModEM. Our resistivity model reveals a significant feature of step discontinuities between high and low resistivity blocks at different depths in the upper and middle crust. These discontinuities correspond well with the sharp topography variations, thus showing clear tendencies to be the thrust faults beneath the Gonghe Basin responsible for the formation of Gonghe Nan Shan (GHNS) thrust belt. Our 3D resistivity model also shows a large higher resistivity body at depths of 3–10 km located beneath the hot springs around the Basin. We interpreted this anomaly as resistive granite body, which acts as hot dry rocks (HDRs) to generate heat for the hot springs on the surface. Our results also reveal a pronounced conductive layer at depths of 10–25 km in the middle-upper crust, which is most likely caused by partial melting for heating the above HDRs. This high conductivity layer would behave in a ductile regime near the bottom of the high resistivity body and act as a decollement for the crustal shortening and deformation in the northeastern margin of the Tibetan Plateau. © 2020 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170589
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, Anhui, China; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China; Center for hydrogeology and environmental geology survey, China Geological Survey, Baoding, China

Recommended Citation:
Gao J.,Zhang H.,Zhang H.,et al. Three-dimensional magnetotelluric imaging of the SE Gonghe Basin: Implication for the orogenic uplift in the northeastern margin of the Tibetan plateau[J]. Tectonophysics,2020-01-01,789
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Gao J.]'s Articles
[Zhang H.]'s Articles
[Zhang H.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Gao J.]'s Articles
[Zhang H.]'s Articles
[Zhang H.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Gao J.]‘s Articles
[Zhang H.]‘s Articles
[Zhang H.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.