DOI: 10.1007/s00531-013-0917-1
Scopus记录号: 2-s2.0-84908604807
论文题名: Insights from trace element geochemistry as to the roles of subduction zone geometry and subduction input on the chemistry of arc magmas
作者: Wehrmann H. ; Hoernle K. ; Garbe-Schönberg D. ; Jacques G. ; Mahlke J. ; Schumann K.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 7 起始页码: 1929
结束页码: 1944
语种: 英语
英文关键词: Central American Volcanic Arc
; Chilean Southern Volcanic Zone
; Hydrous flux melting
; Marine sediment input
; Subduction zones
; Trace element geochemistry
Scopus关键词: geometry
; large igneous province
; lava
; magma chemistry
; marine sediment
; melting
; subduction zone
; trace element
; volcano
; Chile
; Costa Rica
英文摘要: Subduction zones of continental, transitional, and oceanic settings, relative to the nature of the overriding plate, are compared in terms of trace element compositions of mafic to intermediate arc rocks, in order to evaluate the relationship between subduction parameters and the presence of subduction fluids. The continental Chilean Southern Volcanic Zone (SVZ) and the transitional to oceanic Central American Volcanic Arc (CAVA) show increasing degrees of melting with increasing involvement of slab fluids, as is typical for hydrous flux melting beneath arc volcanoes. At the SVZ, the central segment with the thinnest continental crust/lithosphere erupted the highest-degree melts from the most depleted sources, similar to the oceanic-like Nicaraguan segment of the CAVA. The northern part of the SVZ, located on the thickest continental crust/lithosphere, exhibits features more similar to Costa Rica situated on the Caribbean Large Igneous Province, with lower degrees of melting from more enriched source materials. The composition of the slab fluids is characteristic for each arc system, with a particularly pronounced enrichment in Pb at the SVZ and in Ba at the CAVA. A direct compositional relationship between the arc rocks and the corresponding marine sediments that are subducted at the trenches clearly shows that the compositional signature of the lavas erupted in the different arcs carries an inherited signal from the subducted sediments. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908604807&doi=10.1007%2fs00531-013-0917-1&partnerID=40&md5=be07ec756cb04baa4683deec7faa874c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70423
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: SFB574, GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany; Institute of Geosciences, University of Kiel, Ludewig-Meyn-Str. 10, Kiel, Germany
Recommended Citation:
Wehrmann H.,Hoernle K.,Garbe-Schönberg D.,et al. Insights from trace element geochemistry as to the roles of subduction zone geometry and subduction input on the chemistry of arc magmas[J]. International Journal of Earth Sciences,2014-01-01,103(7)