| DOI: | 10.1002/2013GL057976
|
| 论文题名: | Iron isotopic evidence for convective resurfacing of recycled arc-front mantle beneath back-arc basins |
| 作者: | Nebel O.; Arculus R.J.; Sossi P.A.; Jenner F.E.; Whan T.H.E.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8358
|
| EISSN: | 1944-8089
|
| 出版年: | 2013
|
| 卷: | 40, 期:22 | | 起始页码: | 5849
|
| 结束页码: | 5853
|
| 语种: | 英语
|
| 英文关键词: | convection
; Fe isotopes
; Lau Basin
; mantle wedge
; melt depletion
; subduction
|
| Scopus关键词: | Fe isotopes
; Lau Basin
; Mantle wedge
; Melt depletion
; subduction
; Heat convection
; Neodymium
; Recycling
; Structural geology
; Isotopes
; asthenosphere
; backarc basin
; diapir
; geophysical method
; iron
; island arc
; isotopic analysis
; isotopic composition
; mantle chemistry
; mantle structure
; melt
; neodymium isotope
; slab
; spreading center
; subduction zone
; Lau Basin
; Pacific Ocean
|
| 英文摘要: | Geophysical observations suggest sub-arc convective flow transports melt-exhausted and metasomatized wedge mantle into deeper mantle regions. Reciprocally, asthenospheric, fertile mantle may supply back-arc ridges distal to the trench by shallow, lateral mantle ingress, insinuating initial wedge mantle depletion in its back-arc region. Here we show that light Fe isotope compositions of the Central Lau Spreading Centre located in the Lau back-arc basin on the farside of the Tonga-Kermadec arc are indicative for derivation from a modified arc-front mantle with elemental and Nd-isotopic memory of former slab fluid addition. We propose that this shallow wedge material has been transported from the sub-arc mantle to the back-arc either convectively or in a buoyant diapir. This implies that melt-depleted mantle in subduction zones is, at least in parts, recycled in a resurfacing loop. This can explain the depletion in back-arc regions, and the progressively depleted nature of island arc sources in maturing arc systems. ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84890538318&doi=10.1002%2f2013GL057976&partnerID=40&md5=00fb7203d65798b0c8286a8571458ae1
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/5622
|
| Appears in Collections: | 气候减缓与适应
|
|
There are no files associated with this item.
|
|
作者单位: | Research School of Earth Sciences, Australian National University, Building 61, Mills Road, Canberra, ACT 0200, Australia
|
| Recommended Citation: | |
Nebel O.,Arculus R.J.,Sossi P.A.,et al. Iron isotopic evidence for convective resurfacing of recycled arc-front mantle beneath back-arc basins[J]. Geophysical Research Letters,2013-01-01,40(22).
|
|
|