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| DOI | 10.1016/j.epsl.2021.116981 |
| Ancient refractory asthenosphere revealed by mantle re-melting at the Arctic Mid Atlantic Ridge | |
| Sanfilippo A.; Salters V.J.M.; Sokolov S.Y.; Peyve A.A.; Stracke A. | |
| 发表日期 | 2021 |
| ISSN | 0012821X |
| 卷号 | 566 |
| 英文摘要 | The upper mantle is a heterogeneous mixture of refractory and recycled crustal domains. The recycled portions, more fertile and thus preferentially melted, dominate the composition of the basalts erupted on the surface, whereas the imprint of melting of the refractory counterparts is more difficult to discern from the basalt chemistry. Contrasting radiogenic isotopic signatures of mid-ocean ridge basalts and oceanic mantle, however, show that Hf isotope ratios may provide hints for melting of refractory source materials despite ubiquitous magma mixing during ascent and stalling in the crust. This property may allow identifying contributions from depleted mantle materials unseen in other isotope systematics in basalts. Here, we show that basalts from Mohns and Knipovich ridges, two >500-km long oblique super-segments in the Arctic Atlantic, have distinctly high Hf isotope ratios, not mirrored by comparatively high Nd and low Sr and Pb isotope ratios. These compositions can be explained if a highly depleted asthenospheric mantle melts beneath this section of the Arctic Mid Atlantic Ridge. We argue that this depleted source consists of high proportions of ancient (>1 Ga), ultra-depleted mantle, previously drained of enriched components before being re-melted in its current location following a recent ridge-jump, allowing the identification of ultra-depleted mantle components in the arctic subridge mantle. © 2021 Elsevier B.V. |
| 关键词 | depleted mantleKnipovich Ridgemagma mixingMid Ocean Ridge BasaltsNd-Hf isotopes |
| 英文关键词 | Basalt; Binary alloys; Hafnium; Hafnium alloys; Melting; Mixing; Neodymium alloys; Recycling; Refractory materials; Submarine geology; Depleted mantle; Hf isotope; Isotope ratio; Knipovich Ridge; Magma mixing; Mid Atlantic Ridge; Mid-ocean ridge basalt; Nd-hf isotope; Re-melting; Upper mantle; Isotopes; asthenosphere; hafnium; isotopic ratio; magma; melting; mid-ocean ridge basalt; neodymium isotope; upper mantle; Arctic Ocean; Atlantic Ocean; Knipovich Ridge; Mid-Atlantic Ridge; Mohns Ridge; Norwegian Sea |
| 语种 | 英语 |
| 来源期刊 | Earth and Planetary Science Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/203283 |
| 作者单位 | Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, Pavia, Italy; Department of Earth, Ocean Atmospheric Science, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, United States; Geological Institute, Russian Academy of Science, Moscow, Russian Federation; Institut für Mineralogie, Westfälische Wilhelms-Universität, Münster, Germany |
| 推荐引用方式 GB/T 7714 | Sanfilippo A.,Salters V.J.M.,Sokolov S.Y.,et al. Ancient refractory asthenosphere revealed by mantle re-melting at the Arctic Mid Atlantic Ridge[J],2021,566. |
| APA | Sanfilippo A.,Salters V.J.M.,Sokolov S.Y.,Peyve A.A.,&Stracke A..(2021).Ancient refractory asthenosphere revealed by mantle re-melting at the Arctic Mid Atlantic Ridge.Earth and Planetary Science Letters,566. |
| MLA | Sanfilippo A.,et al."Ancient refractory asthenosphere revealed by mantle re-melting at the Arctic Mid Atlantic Ridge".Earth and Planetary Science Letters 566(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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