DOI: 10.1038/ngeo2788
论文题名: Parental arc magma compositions dominantly controlled by mantle-wedge thermal structure
作者: Turner S.J. ; Langmuir C.H. ; Katz R.F. ; Dungan M.A. ; Escrig S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 10 起始页码: 772
结束页码: 776
语种: 英语
Scopus关键词: crustal thickening
; isotopic analysis
; magma
; mantle process
; numerical model
; tectonic wedge
; thermal structure
; volcanic belt
; Chile
英文摘要: The processes that lead to the fourfold variation in arc-averaged compositions of mafic arc lavas remain controversial. Control by the mantle-wedge thermal structure is supported by chemical correlations with the thickness of the underlying arc crust, which affects the thermal state of the wedge. Control by down-going slab temperature is supported by correlations with the slab thermal parameter. The Chilean Southern Volcanic Zone provides a test of these hypotheses. Here we use chemical data to demonstrate that the Southern Volcanic Zone and global arc averages define the same chemical trends, both among elements and between elements and crustal thickness. But in contrast to the global arc system, the Southern Volcanic Zone is built on crust of variable thickness with a constant slab thermal parameter. This natural experiment, along with a set of numerical simulations, shows that global arc compositional variability is dominated by different extents of melting that are controlled by the thermal structure of the mantle wedge. Slab temperatures play a subordinate role. Variations in the subducting slab's fluid flux and sediment compositions, as well as mantle-wedge heterogeneities, produce second-order effects that are manifested as distinctive trace element and isotopic signatures; these can be more clearly elucidated once the importance of wedge thermal structure is recognized. © 2016 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105912
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: Department of Earth Sciences, University of Oxford, Oxford, Oxfordshire, United Kingdom; Department of Earth and Planetary Science, Harvard University, Cambridge, MA, United States; Department of Geological Sciences, University of Oregon, Eugene, OR, United States; École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
Recommended Citation:
Turner S.J.,Langmuir C.H.,Katz R.F.,et al. Parental arc magma compositions dominantly controlled by mantle-wedge thermal structure[J]. Nature Geoscience,2016-01-01,9(10)