DOI: 10.1002/2015GL064804
论文题名: Electrical conductivity of lawsonite and dehydrating fluids at high pressures and temperatures
作者: Manthilake G. ; Mookherjee M. ; Bolfan-Casanova N. ; Andrault D.
刊名: Geophysical Research Letters
ISSN: 0094-9173
EISSN: 1944-8904
出版年: 2015
卷: 42, 期: 18 起始页码: 7398
结束页码: 7405
语种: 英语
英文关键词: dehydration
; dihedral angle
; electrical conductivity
; lawsonite
; subduction zones
; supercritical fluid
Scopus关键词: Dehydration
; Dihedral angle
; Effluent treatment
; Electric conductivity
; Shear flow
; Shear waves
; Silicates
; Supercritical fluids
; Electrical conductivity
; High electrical conductivity
; High-pressure and temperatures
; Lawsonite
; Low-velocity anomaly
; Shear wave velocity
; Subduction zones
; Thermodynamically stable
; Silicate minerals
; dehydration
; electrical conductivity
; high pressure
; high temperature
; lawsonite
; oceanic crust
; S-wave
; slab
; subduction zone
; supercritical flow
; Chile
; Japan
英文摘要: Lawsonite is a calcium-aluminum bearing hydrous silicate mineral with CaAl2Si2O7(OH)2.H2O stoichiometry. It is thermodynamically stable in the hydrated oceanic crust. Low-velocity anomalies observed in the cold subducted slabs have been related to the unusual shear wave velocities of lawsonite eclogite. However, electrical conductivity of lawsonite at high pressure and temperature remains unknown. In this study, we measured the electrical conductivity of lawsonite at 7 GPa, and temperatures ranging from 298 K-1320 K. At 1173 K, the electrical conductivity of lawsonite is around 10-1 S/m. A sharp increase of electrical conductivity is observed at temperatures exceeding the dehydration ~1258 K. The high electrical conductivity up to 101 S/m observed in our experiments is due to the presence of highly conductive fluid and could explain the low resistivity observed at 150-250 km depths in subduction zone settings such as NE Japan, northern, and central Chile. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945475089&doi=10.1002%2f2015GL064804&partnerID=40&md5=6bacf5ec36632da57493818a6ecc076b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8789
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Laboratoire Magmas et Volcans, CNRS 6524, UPB, IRD, Clermont-Ferrand, France
Recommended Citation:
Manthilake G.,Mookherjee M.,Bolfan-Casanova N.,et al. Electrical conductivity of lawsonite and dehydrating fluids at high pressures and temperatures[J]. Geophysical Research Letters,2015-01-01,42(18).