DOI: 10.1002/grl.50513
论文题名: Arc magma compositions controlled by linked thermal and chemical gradients above the subducting slab
作者: Watt S.F.L. ; Pyle D.M. ; Mather T.A. ; Naranjo J.A.
刊名: Geophysical Research Letters
ISSN: 0094-8959
EISSN: 1944-8690
出版年: 2013
卷: 40, 期: 11 起始页码: 2550
结束页码: 2556
语种: 英语
英文关键词: Arc magma generation
; Chile
; Picrite
; Primary melt
; Primitive magma
; Scoria cone
Scopus关键词: Arc magmas
; Chile
; Picrite
; Primitive magma
; Scoria cone
; Atmospheric temperature
; Surface properties
; Computer simulation
; geothermometry
; magma chemistry
; magmatism
; melting
; picrite
; slab
; subduction zone
; volcanic rock
; Chile
英文摘要: Global arc magmatism is sustained by a continuous fluid flux that is returned to the mantle in subduction zones. Despite considerable advances in simulations of melting processes, models of arc magmatism remain incompletely tested against erupted products. Here, we show that a suite of primitive volcanic rocks from across the southern Chilean arc preserves the signature of a systematic down-slab gradient in fluid chemistry. The chemical gradient is consistent with predictions from modeling, geothermometry and experiments. We infer that increasing slab-surface temperatures cause the sub-arc slab flux to become less water-rich and increasingly dominated by hydrous melts over a distance of a few kilometers behind the arc front. This change exerts a first-order control on magma chemistry, and implies discrete melt-transport pathways through subduction zones. Our results replicate patterns in other arcs, implying common sub-arc slab-surface temperature ranges in thermally-diverse subduction zones. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879967746&doi=10.1002%2fgrl.50513&partnerID=40&md5=641f53fb186b65b866610af67d806cc3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6223
Appears in Collections: 气候减缓与适应
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作者单位: National Oceanography Centre Southampton, Waterfront Campus, University of Southampton, European Way, Southampton SO14 3ZH, United Kingdom
Recommended Citation:
Watt S.F.L.,Pyle D.M.,Mather T.A.,et al. Arc magma compositions controlled by linked thermal and chemical gradients above the subducting slab[J]. Geophysical Research Letters,2013-01-01,40(11).