| DOI: | 10.1002/grl.50966
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| 论文题名: | NAL phase in K-rich portions of the lower mantle |
| 作者: | Kato C.; Hirose K.; Komabayashi T.; Ozawa H.; Ohishi Y.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8511
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| EISSN: | 1944-8242
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| 出版年: | 2013
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| 卷: | 40, 期:19 | | 起始页码: | 5085
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| 结束页码: | 5088
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| 语种: | 英语
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| 英文关键词: | Al phase
; CF phase
; high pressure
; lower mantle
; NAL phase
; phase relation
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| Scopus关键词: | Al phase
; High pressure
; Lower mantle
; NAL phase
; Phase relation
; High pressure engineering
; Potassium
; Silicon
; Structural geology
; X ray diffraction
; Aluminum
; aluminum
; core-mantle boundary
; diamond anvil cell
; heat source
; high pressure
; low velocity zone
; lower mantle
; magma chamber
; partial melting
; potassium
; seismology
; X-ray diffraction
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| 英文摘要: | The stability of the K-rich new aluminous (NAL) phase was examined on the join Na1.00Mg2.00Al4.80Si1.15O 12-K1.00Mg2.00Al4.80Si 1.15O12 (Na100-K100) up to 144 GPa by X-ray diffraction in a laser-heated diamond anvil cell. Single-phase K100 and Na50K50 NAL were formed up to the lower mantle conditions, and the NAL phase coexisted with the calcium ferrite-type (CF) phase at 120 GPa and 2300 K for the Na75K25 bulk composition. This is a striking contrast to the K-free (Na100) NAL that becomes unstable above 27 GPa at 1850 K, which suggests that potassium stabilizes NAL at significantly higher pressures. K-rich NAL may host potassium in the lower mantle that contains K2O more than 0.09 wt %. In addition, the NAL phase likely formed owing to partial melting in the ultralow-velocity zone or because of a basal magma ocean. Future seismological observations may clarify whether NAL is a radiogenic heat source above the core-mantle boundary. Key Points Potassium expands the stability of the NAL phase dramatically K-rich NAL is stable o the lowermost mantle conditions NAL forms in the whole lower mantle where the K2O content is higher than 900 ppm ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884998125&doi=10.1002%2fgrl.50966&partnerID=40&md5=60b65a1f65f71f2a7d873b913ddb4067
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/5775
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
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| Recommended Citation: | |
Kato C.,Hirose K.,Komabayashi T.,et al. NAL phase in K-rich portions of the lower mantle[J]. Geophysical Research Letters,2013-01-01,40(19).
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