Percolation of Low-Dimensional Water at Crystalline Interfaces Mediates Fluid Migration in Subducting Slabs
文献类型：期刊论文
| 作者 | Chen, Meng1,3 ; Zhu, Runliang1,2,3; Zhu, Jianxi1,2,3; He, Hongping1,2,3
|
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 128期号:9页码:16 |
| 关键词 | hydrous mineral molecular simulation thermodynamics high pressure phyllosilicate water |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2023JB027124 |
| 英文摘要 | During subduction, metamorphic dehydration reactions in the downgoing slab release fluids, generating fluid overpressure. It has been suggested that fluid is driven to flow upward by buoyancy, but a sufficiently high permeability allowing formation of a fluid percolation network is required. Traditionally, fluid percolation has been identified based on the textural equilibrium assumption by measuring the dihedral angle at the triple junction of grains. According to this theory, grain boundaries generally cannot be infiltrated by fluid, and only the grain edge can form a fluid flow channel. We argue that this theory is insufficient because we have found that water from fluid can be adsorbed into the crystalline interface, that is, a layered mineral interlayer, a crack, or a grain boundary. The high pressure in a subducting slab drives water adsorption into the crystalline interface, forming a low-dimensional fluidic phase, and thus fluid percolation is achieved. Because water adsorbed in the interface is fluidic, water diffusion drives fluid transport in the subducting slab. Due to water adsorption, fluid overpressure at the dehydration front may release, so that dehydration embrittlement may be excluded. Stable water adsorption in the subduction-slab conditions is determined here by combining molecular dynamics simulations and thermodynamic calculations. Analysis based on simulations shows that water adsorption requires crystalline surfaces which do not form hydrogen bonds well. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001064404500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74810]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Chen, Meng |
| 作者单位 | 1.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou Inst Geochem,Inst Earth Sci, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Meng,Zhu, Runliang,Zhu, Jianxi,et al. Percolation of Low-Dimensional Water at Crystalline Interfaces Mediates Fluid Migration in Subducting Slabs[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(9):16. |
| APA | Chen, Meng,Zhu, Runliang,Zhu, Jianxi,&He, Hongping.(2023).Percolation of Low-Dimensional Water at Crystalline Interfaces Mediates Fluid Migration in Subducting Slabs.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(9),16. |
| MLA | Chen, Meng,et al."Percolation of Low-Dimensional Water at Crystalline Interfaces Mediates Fluid Migration in Subducting Slabs".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.9(2023):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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