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| DOI | 10.1038/s41561-022-00947-w |
| High water content of arc magmas recorded in cumulates from subduction zone lower crust | |
| Urann B.M.; Le Roux V.; Jagoutz O.; Müntener O.; Behn M.D.; Chin E.J. | |
| 发表日期 | 2022 |
| ISSN | 1752-0894 |
| 起始页码 | 501 |
| 结束页码 | 508 |
| 卷号 | 15期号:6 |
| 英文摘要 | Magmatic volatiles (for example, water) are abundant in arc melts and exert fundamental controls on magma evolution, eruption dynamics and the formation of economic ore deposits. To constrain the H2O content of arc magmas, most studies have relied on measuring extrusive products and mineral-hosted melt inclusions. However, these methods have inherent limitations that obfuscate the full range of H2O in arc magmas. Here, we report secondary-ion mass spectrometry measurements of volatile (H2O, F, P, S, Cl) abundances in lower-crustal cumulate minerals from the Kohistan palaeo-arc (northwestern Pakistan) and determine H2O abundances of melts from which the cumulates crystallized. Pyroxenes retained magmatic H2O abundances and record damp (less than 1 wt% H2O) to hydrous (up to 10 wt% H2O) primitive melts. Subsequent crystal fractionation led to formation of super-hydrous melts with approximately 12–20 wt% H2O, predicted petrologically yet virtually absent from the melt-inclusion record. Porphyry copper deposits are probably a natural eventuality of fluid exsolution from super-hydrous melts, corroborating a growing body of evidence. © 2022, The Author(s), under exclusive licence to Springer Nature Limited. |
| 语种 | 英语 |
| scopus关键词 | cumulate; lower crust; magma; melt inclusion; ore deposit; subduction zone; water content; Kohistan; Pakistan |
| 来源期刊 | Nature Geoscience
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/262189 |
| 作者单位 | MIT-WHOI Joint Program, Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States |
| 推荐引用方式 GB/T 7714 | Urann B.M.； Le Roux V.； Jagoutz O.； Müntener O.； Behn M.D.； Chin E.J.. High water content of arc magmas recorded in cumulates from subduction zone lower crust[J],2022,15(6). |
| APA | Urann B.M.； Le Roux V.； Jagoutz O.； Müntener O.； Behn M.D.； Chin E.J..(2022).High water content of arc magmas recorded in cumulates from subduction zone lower crust.Nature Geoscience,15(6). |
| MLA | Urann B.M.； Le Roux V.； Jagoutz O.； Müntener O.； Behn M.D.； Chin E.J.."High water content of arc magmas recorded in cumulates from subduction zone lower crust".Nature Geoscience 15.6(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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