DOI: 10.1016/j.epsl.2018.06.041
Scopus记录号: 2-s2.0-85049597120
论文题名: Petrogenesis of boninitic lavas from the Troodos Ophiolite, and comparison with Izu–Bonin–Mariana fore-arc crust
作者: Woelki D. ; Regelous M. ; Haase K.M. ; Romer R.H.W. ; Beier C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 498 起始页码: 203
结束页码: 214
语种: 英语
英文关键词: boninitic glass
; Cyprus
; interbedded
; Izu–Bonin–Mariana
; ophiolite
; subduction initiation
Scopus关键词: Basalt
; Glass
; Piles
; Tectonics
; Trace elements
; Cyprus
; interbedded
; Major and trace elements
; Nd and Pb isotopes
; ophiolite
; Subduction initiation
; Subduction zones
; Tholeiitic basalts
; Lithology
英文摘要: Supra-subduction zone (SSZ) ophiolites such as the Troodos Ophiolite of Cyprus are thought to have formed at spreading centres close to subduction zones. Similarities in the geochemistry between lavas from SSZ ophiolites and fore-arc lavas from active subduction zones, and the presence of boninites in both, have led to the suggestion that SSZ ophiolites represent fragments of fore-arc crust and mantle, formed during subduction initiation. Here we present major and trace element and Sr, Nd and Pb isotope data for fresh volcanic glasses from a section through the lava pile on the southern margin of the Troodos Ophiolite, and compare these to lavas from the Izu–Bonin–Mariana fore-arc. In Troodos, boninites and tholeiitic basalts are interbedded and were derived from a highly depleted mantle source that was later enriched by both fluids and melts derived largely from subducted sediment, before melting beneath the spreading axis. Troodos boninites differ from Izu–Bonin–Mariana boninites by their greater source depletion, enrichment in Nb by small degree melts, and lack of Zr enrichment relative to Sm. Together with the lack of fore-arc basalts in Troodos, our data imply that the Troodos Ophiolite was formed in a fore-arc location at a back-arc spreading centre that propagated into arc crust. The Troodos Ophiolite was thus not formed during subduction initiation and thus may not be used as analogue for the formation of fore-arc basalts. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109762
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: GeoZentrum Nordbayern, Friedrich-Alexander-Universität (FAU) Erlangen–Nürnberg, Schlossgarten 5, Erlangen, D-91054, Germany
Recommended Citation:
Woelki D.,Regelous M.,Haase K.M.,et al. Petrogenesis of boninitic lavas from the Troodos Ophiolite, and comparison with Izu–Bonin–Mariana fore-arc crust[J]. Earth and Planetary Science Letters,2018-01-01,498