globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-017-0008-1
论文题名:
A role for subducted super-hydrated kaolinite in Earth's deep water cycle
作者: Hwang H.; Seoung D.; Lee Y.; Liu Z.; Liermann H.-P.; Cynn H.; Vogt T.; Kao C.-C.; Mao H.-K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:12
起始页码: 947
结束页码: 953
语种: 英语
Scopus关键词: aluminosilicate ; chemical analysis ; clay mineral ; deep water ; dehydration ; hydrological cycle ; kaolinite ; magma ; P-T conditions ; seismicity ; slab ; subduction zone ; temperature effect ; volcanism ; water content
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 °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 °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. © 2017 The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105665
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth System Sciences, Yonsei University, Seoul, South Korea; Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, United States; Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, China; Department of Civil and Environmental Engineering, George Washington University, Washington, DC, United States; Photon Sciences, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany; High-Pressure Physics Group, Physics and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA, United States; NanoCenter and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, United States; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, United States; Department of Earth System and Environmental Sciences, Chonnam National University, Gwangju, South Korea

Recommended Citation:
Hwang H.,Seoung D.,Lee Y.,et al. A role for subducted super-hydrated kaolinite in Earth's deep water cycle[J]. Nature Geoscience,2017-01-01,10(12)
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