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Electron diffraction determination of 11.5 Aa and HySo structures; candidate water carriers to the upper mantle

Mauro Gemmi, Marco Merlini, Lukas Palatinus, Patrizia Fumagalli and Michael Hanfland
Electron diffraction determination of 11.5 Aa and HySo structures; candidate water carriers to the upper mantle
American Mineralogist (December 2016) 101 (12): 2645-2654

Abstract

The dehydration reactions of minerals in subduction zones strongly control geological processes, such as arc volcanism, earthquakes, serpentinization, or geochemical transport of incompatible elements. In aluminum-bearing systems, chlorite is considered the most important hydrous phase at the top of the subducting plate, and significant amount of water is released after its decomposition. However, the dehydration mechanism is not fully understood, and additional hydrates are stabilized by the presence of Al beyond the stability field of chlorite. We applied here a cutting-edge analytical approach to characterize the experimental rocks synthesized at the high pressures and temperatures matching with deep subduction conditions in the upper mantle. Fast electron diffraction tomography and high-resolution synchrotron X-ray diffraction allowed the identification and the successful structure solution of two new hydrous phases formed as dehydration product of chlorite. The 11.5 Aa phase, Mg (sub 6) Al(OH) (sub 7) (SiO (sub 4) ) (sub 2) , is a hydrous layer structure. It presents incomplete tetrahedral sheets and face-sharing magnesium and aluminum octahedra. The structure has a higher Mg/Si ratio compared to chlorite, and a significantly higher density (rho (sub 0) =2.93 g/cm (super 3) ) and bulk modulus [K (sub 0) =108.3(8) GPa], and it incorporates 13 wt% of water. The HySo phase, Mg (sub 3) Al(OH) (sub 3) (Si (sub 2) O (sub 7) ), is a dense layered sorosilicate, [rho (sub 0) =3.13 g/cm (super 3) and K (sub 0) =120.6(6) GPa] with an average water content of 8.5 wt%. These phases indicate that water release process is highly complex, and may proceed with multistep dehydration, involving these layer structures whose features well match the high-shear zones present at the slab-mantle wedge interface.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 101
Serial Issue: 12
Title: Electron diffraction determination of 11.5 Aa and HySo structures; candidate water carriers to the upper mantle
Affiliation: Istituto Italiano di Tecnologia, Center for Nanotechnology Innovation, Pisa, Italy
Pages: 2645-2654
Published: 201612
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 41
Accession Number: 2017-005893
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Universita di Milano, ITA, ItalyAcademy of Sciences of the Czech Republic, Institute of Physics, CZE, Czech RepublicEuropean Synchrotron Radiation Facility, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201705
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