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DOI | 10.1038/s41561-017-0008-1 |
A role for subducted super-hydrated kaolinite in Earth's deep water cycle | |
Hwang, Huijeong1; Seoung, Donghoon1,2,10; Lee, Yongjae1,3; Liu, Zhenxian4; Liermann, Hanns-Peter5; Cynn, Hyunchae6; Vogt, Thomas7,8; Kao, Chi-Chang2; Mao, Ho-Kwang3,9 | |
2017-12-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | South Korea; USA; Peoples R China; Germany |
英文摘要 | Water is the most abundant volatile component in the Earth. It continuously enters the mantle through subduction zones, where it reduces the melting temperature of rocks to generate magmas. The dehydration process in subduction zones, which determines whether water is released from the slab or transported into the deeper mantle, is an essential component of the deep water cycle. Here we use in situ and time-resolved high-pressure/high-temperature synchrotron X-ray diffraction and infrared spectra to characterize the structural and chemical changes of the clay mineral kaolinite. At conditions corresponding to a depth of about 75 km in a cold subducting slab (2.7 GPa and 200 degrees C), and in the presence of water, we observe the pressure-induced insertion of water into kaolinite. This super-hydrated phase has a unit cell volume that is about 31% larger, a density that is about 8.4% lower than the original kaolinite and, with 29 wt% H2O, the highest water content of any known aluminosilicate mineral in the Earth. As pressure and temperature approach 19 GPa and about 800 degrees C, we observe the sequential breakdown of super-hydrated kaolinite. The formation and subsequent breakdown of super-hydrated kaolinite in cold slabs subducted below 200 km leads to the release of water that may affect seismicity and help fuel arc volcanism at the surface. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416858000018 |
WOS关键词 | PRESSURE-INDUCED HYDRATION ; RIETVELD REFINEMENT ; CRYSTAL-STRUCTURE ; PHASE ; MANTLE ; DEHYDRATION ; LAWSONITE ; STABILITY ; H2O ; DECOMPOSITION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34738 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Yonsei Univ, Dept Earth Syst Sci, Seoul, South Korea; 2.SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA USA; 3.Ctr High Pressure Sci & Technol Adv Res HPSTAR, Shanghai, Peoples R China; 4.George Washington Univ, Dept Civil & Environm Engn, Washington, DC USA; 5.DESY, Photon Sci, Hamburg, Germany; 6.Lawrence Livermore Natl Lab, High Pressure Phys Grp, Phys & Life Sci, Livermore, CA USA; 7.Univ South Carolina, NanoCtr, Columbia, SC USA; 8.Univ South Carolina, Dept Chem & Biochem, Columbia, SC USA; 9.Carnegie Inst Sci, Geophys Lab, Washington, DC USA; 10.Chonnam Natl Univ, Dept Earth Syst & Environm Sci, Gwangju, South Korea |
推荐引用方式 GB/T 7714 | Hwang, Huijeong,Seoung, Donghoon,Lee, Yongjae,et al. A role for subducted super-hydrated kaolinite in Earth's deep water cycle[J]. NATURE GEOSCIENCE,2017,10(12). |
APA | Hwang, Huijeong.,Seoung, Donghoon.,Lee, Yongjae.,Liu, Zhenxian.,Liermann, Hanns-Peter.,...&Mao, Ho-Kwang.(2017).A role for subducted super-hydrated kaolinite in Earth's deep water cycle.NATURE GEOSCIENCE,10(12). |
MLA | Hwang, Huijeong,et al."A role for subducted super-hydrated kaolinite in Earth's deep water cycle".NATURE GEOSCIENCE 10.12(2017). |
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