DOI: 10.1038/ngeo2272
论文题名: A multi-sill magma plumbing system beneath the axis of the East Pacific Rise
作者: Marjanović M. ; Carbotte S.M. ; Carton H. ; Nedimović M.R. ; Mutter J.C. ; Canales J.P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 11 起始页码: 825
结束页码: 829
语种: 英语
Scopus关键词: amplitude
; magma
; mid-ocean ridge
; oceanic crust
; seismic data
; seismic reflection
; volcanic eruption
; East Pacific Rise
; Pacific Ocean
英文摘要: Upper oceanic crust at fast- to intermediate-spreading mid-ocean ridges is thought to form from the intrusion and eruption of magma accumulated within a mid-crustal reservoir present beneath the ridge axis1-3. However, the mechanisms for formation of the lower crust are debated4-8. Observations from pieces of ancient oceanic crust exposed on land - ophiolites - imply that multiple small magma lenses exist throughout the lower crust at mid-ocean ridges and help form the crust4,6,7, yet seismic data have imaged only a single lens beneath the innermost axial zones of various mid-ocean ridges1-3. Here we use high-fidelity seismic data to image the crust beneath the East Pacific Rise. We identify a series of reflections below the axial magma lens that we interpret as magma lenses in the upper part of the lower crust. These reflections are present between 9° 20' and 9° 57' N and are located up to 1.5 km below the axial magma lens. From the geometry and amplitude of the reflections in a zone beneath a recent volcanic eruption9, we infer that magma drained from a lower lens helped replenish the axial magma lens above and, perhaps, contributed to the eruption. Our data indicate that a multi-level complex of magma lenses is present beneath the East Pacific Rise and probably contributes to the formation of both the upper and lower crust. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106382
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, United States; Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, Canada; Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States
Recommended Citation:
Marjanović M.,Carbotte S.M.,Carton H.,et al. A multi-sill magma plumbing system beneath the axis of the East Pacific Rise[J]. Nature Geoscience,2014-01-01,7(11)