Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Stability of the hydrous phases of Al-rich phase D and Al-rich phase H in deep subducted oceanic crust

Liu Xingcheng, Kyoko N. Matsukage, Yu Nishihara, Toshihiro Suzuki and Eiichi Takahashi
Stability of the hydrous phases of Al-rich phase D and Al-rich phase H in deep subducted oceanic crust
American Mineralogist (January 2019) 104 (1): 64-72

Abstract

To understand the stability of hydrous phases in mafic oceanic crust under deep subduction conditions, high-pressure and high-temperature experiments were conducted on two hydrous basalts using a Kawai-type multi-anvil apparatus at 17-26 GPa and 800-1200 degrees C. In contrast to previous studies on hydrous basalt that reported no hydrous phases in this pressure range, we found one or two hydrous phases in all run products at or below 1000 degrees C. Three hydrous phases, including Fe-Ti oxyhydroxide, Al-rich phase D and Al-rich phase H, were present at the investigated P-T conditions. At T< or =1000 degrees C, Fe-Ti oxyhydroxide is stable at 17 GPa, Al-rich phase D is stable at 18-23 GPa, and Al-rich phase H is stable at 25-26 GPa. Our results, in combination with published data on the stability of hydrous phases at lower pressures, suggest that a continuous chain of hydrous phases may exist in subducting cold oceanic crust (< or =1000 degrees C): lawsonite (0-8 GPa), Fe-Ti oxyhydroxide (8-17 GPa), Al-rich phase D (18-23 GPa), and Al-rich phase H (>23 GPa). Therefore, in cold subduction zones, mafic oceanic crust, in addition to peridotite, may also carry a substantial amount of water into the mantle transition zone and the lower mantle.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 104
Serial Issue: 1
Title: Stability of the hydrous phases of Al-rich phase D and Al-rich phase H in deep subducted oceanic crust
Affiliation: Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou, China
Pages: 64-72
Published: 201901
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 41
Accession Number: 2019-016915
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Tokyo Institute of Technology, JPN, JapanTeikyo University of Science, JPN, JapanEhime University, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201911
Close Modal

or Create an Account

Close Modal
Close Modal