DOI: 10.1038/ngeo1933
论文题名: Fine-scale segmentation of the crustal magma reservoir beneath the East Pacific Rise
作者: Carbotte S.M. ; Marjanović M. ; Carton H. ; Mutter J.C. ; Canales J.P. ; Nedimović M.R. ; Han S. ; Perfit M.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 10 起始页码: 866
结束页码: 870
语种: 英语
Scopus关键词: chemical composition
; lava
; magma chamber
; magmatism
; mid-ocean ridge
; seafloor spreading
; seismic reflection
; volcanic eruption
; East Pacific Rise
; Pacific Ocean
英文摘要: The global mid-ocean ridge is segmented in its seafloor morphology and magmatic systems, but the origin of and relationships between this tectonic and magmatic segmentation are poorly understood. At fast-spreading ridges, tectonic segmentation is observed on a fine scale, but it is unclear whether this partitioning also occurs in the magmatic system. Fine-scale tectonic segmentation could have a deep origin, arising from the distribution of upwelling mantle melt, or a shallow origin, linked to offset intruding dikes from long, more continuous crustal reservoirs. Here we use seismic reflection data from the fast-spreading East Pacific Rise, between 820′ N and 1010′ N, which includes a unique area where two documented volcanic eruptions have occurred, to image the crustal magma bodies in high resolution. We find that the magma reservoirs form 5- to 15-km-long segments that coincide with the fine-scale tectonic segmentation at the seafloor and that three lens segments fed the recent eruptions. Transitions in composition, volume and morphology of erupted lavas coincide with disruptions in the lens that define magmatic segments. We conclude that eruptions at the East Pacific Rise are associated with the vertical ascent of magma from lenses that are mostly physically isolated, leading to the eruption of distinct lavas at the surface that coincide with fine-scale tectonic segmentation. © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106699
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 of Columbia University, Palisades, NY 10964, United States; Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Dalhousie University, Department of Earth Sciences, Halifax, NS B3H 4J1, Canada; University of Florida, Department of Geological Sciences, Gainseville, FL 32611, United States
Recommended Citation:
Carbotte S.M.,Marjanović M.,Carton H.,et al. Fine-scale segmentation of the crustal magma reservoir beneath the East Pacific Rise[J]. Nature Geoscience,2013-01-01,6(10)