DOI: 10.1016/j.epsl.2018.03.045
Scopus记录号: 2-s2.0-85044935050
论文题名: Magmatic controls on axial relief and faulting at mid-ocean ridges
作者: Liu Z. ; Buck W.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 491 起始页码: 226
结束页码: 237
语种: 英语
英文关键词: axial relief
; dike intrusion
; faulting
; magmatism
; mid-ocean ridges
Scopus关键词: Faulting
; Hydraulic structures
; Landforms
; Structural geology
; Submarine geology
; axial relief
; Dike intrusion
; Lithospheric structure
; Lithospheric thickness
; Magmatisms
; Mid-ocean ridges
; Steady-state values
; Two dimensional model
; Levees
; asthenosphere
; crustal thickness
; dike
; faulting
; lithosphere
; magma
; magmatism
; mid-ocean ridge
; spreading center
英文摘要: Previous models do not simultaneously reproduce the observed range of axial relief and fault patterns at plate spreading centers. We suggest that this failure is due to the approximation that magmatic dikes open continuously rather than in discrete events. During short – lived events, dikes open not only in the strong axial lithosphere but also some distance into the underlying weaker asthenosphere. Axial valley relief affects the partitioning of magma between the lithosphere and asthenosphere during diking events. The deeper the valley, the more magma goes into lithospheric dikes in each event and so the greater the average opening rate of those dikes. The long-term rate of lithospheric dike opening controls faulting rate and axial depth. The feedback between axial valley depth D and lithospheric dike opening rate allows us to analytically relate steady-state values of D to lithospheric thickness HL and crustal thickness HC. A two-dimensional model numerical model with a fixed axial lithospheric structure illustrates the analytic model implications for axial faulting. The predictions of this new model are broadly consistent with global and segment-scale trends of axial depth and fault patterns with HL and HC. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109930
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Lamont–Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States
Recommended Citation:
Liu Z.,Buck W.R.. Magmatic controls on axial relief and faulting at mid-ocean ridges[J]. Earth and Planetary Science Letters,2018-01-01,491