A negligible role for forearc serpentinites and melange diapirism in contributing halogens to Mariana arc magmas
文献类型：期刊论文
| 作者 | Maunder, Bryden L.3; Kendrick, Mark A.3; Ribeiro, Julia M.2; Nebel, Oliver1 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2024 |
| 卷号 | 625页码:13 |
| 关键词 | Fluorine Chlorine Bromine Iodine Subduction Melange |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2023.118498 |
| 英文摘要 | Trace element enrichment in arc lavas has traditionally been linked to the presence of slab-derived materials introduced by a combination of aqueous slab-fluids derived from altered oceanic crust (AOC) and subducted lithosphere and sediment-melts. However, an alternative is that slab material could be mobilised in m & eacute;lange diapirs formed from forearc serpentinites admixed with sediments and AOC in a subduction channel. In order to further constrain the relative importance of slab-fluids, sediment-melts and m & eacute;lange diapirs in the Marianas and track how the contributions of these components evolves across the arc, we selected submarine volcanic glasses from pillow rinds recovered from the Southeast Mariana Forearc Rift, and the Mariana arc and backarc basin. The glasses are all enriched in halogens and other fluid mobile elements relative to immobile elements of similar compatibility, demonstrating a strong subduction signature. Irrespective of their position in the arc, the lavas all have Br/Cl weight ratios of 0.0016-0.0037 and I/Cl of 8.3 x 10(-6)-127 x 10(-6), which encompasses a similar range as reported for arc and backarc glasses from the SW Pacific. The Br/Cl and I/Cl of the subduction component overlaps with altered ocean crust suggesting dehydration of altered ocean crust (+/- lithospheric serpentinites) as the dominant source of halogens and related slab-fluids. The Br/Cl and I/Cl of the Marianas glasses are much lower than forearc serpentinites from the Marianas, which does not favour a role for either dehydration of forearc serpentinites entrained with the subducting slab or direct melting of m & eacute;lange diapirs formed from serpentinised forearc material. The halogen data are most easily reconciled with the conventional model for arc magma generation, in which halogen-bearing aqueous fluids are progressively released from a dehydrating subducting slab. The importance of sediment-melts and/or forearc serpentinites in significantly contributing to the subduction zone budgets of other elements is not precluded, but the high halogen content of forearc serpentinites means that direct melting of m & eacute;lange diapirs is unlikely. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001300675700001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80623]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Maunder, Bryden L. |
| 作者单位 | 1.Monash Univ, Sch Earth Atmosphere & Environm, Melbourne, Vic 3800, Australia 2.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Univ Queensland, Sch Environm, Brisbane, Qld 4072, Australia |
| 推荐引用方式 GB/T 7714 | Maunder, Bryden L.,Kendrick, Mark A.,Ribeiro, Julia M.,et al. A negligible role for forearc serpentinites and melange diapirism in contributing halogens to Mariana arc magmas[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,625:13. |
| APA | Maunder, Bryden L.,Kendrick, Mark A.,Ribeiro, Julia M.,&Nebel, Oliver.(2024).A negligible role for forearc serpentinites and melange diapirism in contributing halogens to Mariana arc magmas.EARTH AND PLANETARY SCIENCE LETTERS,625,13. |
| MLA | Maunder, Bryden L.,et al."A negligible role for forearc serpentinites and melange diapirism in contributing halogens to Mariana arc magmas".EARTH AND PLANETARY SCIENCE LETTERS 625(2024):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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