Mantle metasomatism induced by water-fluxed melting of subducted continental crust at ultrahigh pressures
文献类型：期刊论文
| 作者 | Gao, Mingdi1,2,3; Foley, Stephen F.1; Xu, Haijin3; Wang, Yu2 |
| 刊名 | GEOLOGY
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 51期号:12页码:1127-1131 |
| ISSN号 | 0091-7613 |
| DOI | 10.1130/G51547.1 |
| 英文摘要 | Mantle metasomatism under ultrahigh-pressure (UHP) conditions is widely recognized in orogenic peridotites and pyroxenites from UHP terranes. However, the processes by which the deeply subducted continental crust reacts with the mantle remain obscure. To investigate the metasomatic regime under UHP conditions, we conducted layered reaction experiments between gneiss and peridotite at 5 GPa and 800-1100 degrees C, with free water added in some of the experiments. At temperatures below the gneiss solidus, the major metasomatic agent is aqueous fluid, with the main reaction products being orthopyroxene + phlogopite + K-richterite. At temperatures above the gneiss solidus, hydrous melt becomes the major metasomatic agent, and the major reaction products vary from orthopyroxene + phlogopite to orthopyroxene + garnet with increasing degree of melting. The transformation from phlogopite to garnet occurred between 1000 degrees C and 1100 degrees C for runs without water added and between 800 degrees C and 900 degrees C for runs with water added. Pyroxenites in UHP terranes are mainly characterized by the metasomatic growth of orthopyroxene and garnet at 4-6 GPa and 750-1000 degrees C. Only experiments with water added reproduced the metasomatic assemblage at similar pressure -temperature conditions, indicating that mantle metasomatism in UHP terranes is probably mainly induced by water-fluxed melting of the continental crust under UHP conditions. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001124091700009 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77400]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Xu, Haijin; Wang, Yu |
| 作者单位 | 1.Macquarie Univ, Sch Nat Sci, N Ryde, NSW 2109, Australia 2.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, Mingdi,Foley, Stephen F.,Xu, Haijin,et al. Mantle metasomatism induced by water-fluxed melting of subducted continental crust at ultrahigh pressures[J]. GEOLOGY,2023,51(12):1127-1131. |
| APA | Gao, Mingdi,Foley, Stephen F.,Xu, Haijin,&Wang, Yu.(2023).Mantle metasomatism induced by water-fluxed melting of subducted continental crust at ultrahigh pressures.GEOLOGY,51(12),1127-1131. |
| MLA | Gao, Mingdi,et al."Mantle metasomatism induced by water-fluxed melting of subducted continental crust at ultrahigh pressures".GEOLOGY 51.12(2023):1127-1131. |
入库方式： OAI收割
来源：广州地球化学研究所
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