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DOI | 10.1016/j.epsl.2019.116000 |
Stability and migration of slab-derived carbonate-rich melts above the transition zone | |
Sun Y.; Hier-Majumder S.; Xu Y.; Walter M. | |
发表日期 | 2020 |
ISSN | 0012821X |
卷号 | 531 |
英文摘要 | We present a theoretical model of the stability and migration of carbonate-rich melts to test whether they can explain seismic low-velocity layers (LVLs) observed above stalled slabs in several convergent tectonic settings. The LVLs, located atop the mantle transition zone, contain small (∼1 vol%) amounts of partial melt, possibly derived from melting of subducted carbonate-bearing oceanic crust. Petrological and geochemical evidence from inclusions in superdeep diamonds supports the existence of slab-derived carbonate melt, which may potentially explain the origin of the observed melt in the LVL. However, the presumptive reducing nature of the ambient mantle can be an impediment to the stability of carbonated melt. To reconcile this apparent contradiction, we test the stability and migration rates of carbonate-rich melts atop a stalled slab as a function of melt percolation, redox freezing, amount of carbon supplied by subduction, and the metallic Fe concentration in the mantle. Our results demonstrate that carbonate-rich melts in the LVL can potentially survive redox freezing over long geological time scales. We also show that the amount of subducted carbon exerts a stronger influence on the stability of carbonate melt than does the mantle redox condition. Concentration dependent melt density leads to rapid melt propagation through channels while a constant melt density causes melt to migrate as a planar front. Our calculations suggest that the LVLs can sequester significant fractions of carbon transported to the mantle by subduction. © 2019 Elsevier B.V. |
关键词 | carbonate-rich meltslow-velocity layerreactive porous flowtransition zonevolatile cycle |
英文关键词 | Carbon; Diamond deposits; Freezing; Solvents; Stability; Concentration-dependent; Geochemical evidence; Low velocity layers; Mantle transition zone; Porous flow; Theoretical modeling; Transition zones; volatile cycle; Carbonation; carbonate; geochemistry; low velocity zone; numerical model; partial melting; petrology; porosity; slab; stability analysis; tectonic setting; transition zone |
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/202917 |
作者单位 | State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom; University of Chinese Academy of Sciences, Beijing, 100049, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States |
推荐引用方式 GB/T 7714 | Sun Y.,Hier-Majumder S.,Xu Y.,et al. Stability and migration of slab-derived carbonate-rich melts above the transition zone[J],2020,531. |
APA | Sun Y.,Hier-Majumder S.,Xu Y.,&Walter M..(2020).Stability and migration of slab-derived carbonate-rich melts above the transition zone.Earth and Planetary Science Letters,531. |
MLA | Sun Y.,et al."Stability and migration of slab-derived carbonate-rich melts above the transition zone".Earth and Planetary Science Letters 531(2020). |
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