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A role for subducted super-hydrated kaolinite in Earth’s deep water cycle

Hwang, Huijeong ; Seoung, Donghoon ; Lee, Yongjae ; Liu, Zhenxian ; Liermann, Hanns-Peter ; Cynn, Hyunchae ; Vogt, Thomas ; Kao, Chi-Chang ; Mao, Ho-Kwang

Nature geoscience, 2017-12, Vol.10 (12), p.947-953 [Periódico revisado por pares]

London: Nature Publishing Group

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Título:
A role for subducted super-hydrated kaolinite in Earth’s deep water cycle
Autor: Hwang, Huijeong ; Seoung, Donghoon ; Lee, Yongjae ; Liu, Zhenxian ; Liermann, Hanns-Peter ; Cynn, Hyunchae ; Vogt, Thomas ; Kao, Chi-Chang ; Mao, Ho-Kwang
Assuntos: Breakdown ; Cell size ; Clay ; Clay minerals ; Deep water ; Dehydration ; Earth ; Earth mantle ; GEOSCIENCES ; Hydrologic cycle ; Hydrological cycle ; Infrared spectra ; Infrared spectroscopy ; Kaolinite ; Mantle ; Moisture content ; Pressure ; Seismicity ; Slabs ; Subduction ; Subduction (geology) ; Subduction zones ; Temperature ; Temperature effects ; Volcanic activity ; Volcanism ; Water content ; Water cycle ; X-ray diffraction
É parte de: Nature geoscience, 2017-12, Vol.10 (12), p.947-953
Notas: DOE - BASIC ENERGY SCIENCESNSFDOE-NNSAFOREIGN
Descrição: 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.
Editor: London: Nature Publishing Group
Idioma: Inglês

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A role for subducted super-hydrated kaolinite in Earth’s deep water cycle

Hwang, Huijeong ; Seoung, Donghoon ; Lee, Yongjae ; Liu, Zhenxian ; Liermann, Hanns-Peter ; Cynn, Hyunchae ; Vogt, Thomas ; Kao, Chi-Chang ; Mao, Ho-Kwang

London: Nature Publishing Group

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