中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
Three-dimensional numerical analysis of magma transport through a pre-existing fracture in the crust

文献类型：期刊论文

作者Chen, Zuan1; Cheng, Xu1; Huang, Xiaoge1; Bai, Wuming1; Jin, Zhi-He2
刊名JOURNAL OF GEODYNAMICS
出版日期2014-05-01
卷号76页码:46-55
关键词Magma transport Pre-existing fracture Finite element method Finite difference method Discontinuous deformation analysis
ISSN号0264-3707
DOI10.1016/j.jog.2014.03.002
文献子类Article
英文摘要Magmas are transported through pre-existing fractures in many repeatedly erupting volcanoes. The study of this special process of magma transport is fundamentally important to understand the mechanisms and conditions of volcanic eruptions. In this paper, we numerically simulate the magma propagation process through a pre-existing vertical fracture in the crust by using the combined finite difference method (FDM), finite element method (FEM) and discontinuous deformation analysis (DDA) approach. FDM is used to analyze magma flow in the pre-existing fracture, FEM is used to calculate the opening of the fracture during magma intrusion, and DDA is used to deal with the contact of the closed fracture surfaces. Both two-dimensional (2D) and three-dimensional (3D) examples are presented. Parametric studies are carried out to investigate the influence of various physical and geometric parameters on the magma transport in the pre-existing fracture. We have considered magma chamber depth ranging from 7 km to 10 km under the crust surface, magma viscosity ranging from 2 x 10(-2) to 2 x 10(-2) MPa s, and the density difference between the magma and host rock ranging from 300 to 700 kg/m(3). The numerical results indicate that (1) the fluid pressure p varies gradually along the depth, (2) the shape of the magma body during propagation is like a torch bar and its width ranges from 2 m to 4 m approximately in the 3D case and 10 m to 50 m in the 2D case for the same physical parameters used, (3) the crust surface around the pre-existing fracture begins to increase on both sides of the fracture, forms a trough between them, then gradually uplifts during the transport of the magma, and finally takes the shape of a crater when the magma reaches the surface. We have also examined the influence of physical and geometric parameters on the minimum overpressure for magma transport in the 3D case. The numerical results show that our numerical technique presented in this paper is an effective tool for simulating magma transport process through pre-existing fractures in the crust. (C) 2014 Elsevier Ltd. All rights reserved.
WOS关键词DRIVEN CRACK-PROPAGATION ; DYKE PROPAGATION ; COMPOSITE VOLCANOS ; LOCAL STRESSES ; FILLED CRACKS ; EMPLACEMENT ; BUOYANCY ; DEFORMATION ; MODEL ; EARTHQUAKE
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000335621200004
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China(40874046 ; National Natural Science Foundation of China(40874046 ; Chinese Academy of Sciences(KZCX2-EW-118) ; Chinese Academy of Sciences(KZCX2-EW-118) ; 40974049 ; 40974049 ; 41174073) ; 41174073) ; National Natural Science Foundation of China(40874046 ; National Natural Science Foundation of China(40874046 ; Chinese Academy of Sciences(KZCX2-EW-118) ; Chinese Academy of Sciences(KZCX2-EW-118) ; 40974049 ; 40974049 ; 41174073) ; 41174073) ; National Natural Science Foundation of China(40874046 ; National Natural Science Foundation of China(40874046 ; Chinese Academy of Sciences(KZCX2-EW-118) ; Chinese Academy of Sciences(KZCX2-EW-118) ; 40974049 ; 40974049 ; 41174073) ; 41174073) ; National Natural Science Foundation of China(40874046 ; National Natural Science Foundation of China(40874046 ; Chinese Academy of Sciences(KZCX2-EW-118) ; Chinese Academy of Sciences(KZCX2-EW-118) ; 40974049 ; 40974049 ; 41174073) ; 41174073)
源URL[http://ir.iggcas.ac.cn/handle/132A11/85241]  
专题中国科学院地质与地球物理研究所
通讯作者Chen, Zuan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Study Earths Deep Interior, Beijing 100029, Peoples R China
2.Univ Maine, Dept Mech Engn, Orono, ME 04469 USA
推荐引用方式
GB/T 7714		 Chen, Zuan,Cheng, Xu,Huang, Xiaoge,et al. Three-dimensional numerical analysis of magma transport through a pre-existing fracture in the crust[J]. JOURNAL OF GEODYNAMICS,2014,76:46-55.
APA Chen, Zuan,Cheng, Xu,Huang, Xiaoge,Bai, Wuming,&Jin, Zhi-He.(2014).Three-dimensional numerical analysis of magma transport through a pre-existing fracture in the crust.JOURNAL OF GEODYNAMICS,76,46-55.
MLA Chen, Zuan,et al."Three-dimensional numerical analysis of magma transport through a pre-existing fracture in the crust".JOURNAL OF GEODYNAMICS 76(2014):46-55.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。