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Permanent link (DOI): https://doi.org/10.7939/R3J88M

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Effect of chlorine on the melting of the subcratonic lithospheric mantle Open Access

Descriptions

Other title
Subject/Keyword
subcratonic lithospheric mantle
chlorine
solidus
fibrous diamond
water
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chu, Linglin
Supervisor and department
Luth, Robert (Earth & Atmospheric Sciences)
Examining committee member and department
Chacko, Tom (Earth & Atmospheric Sciences)
Luth, Robert (Earth & Atmospheric Sciences)
Gu, Jeff (Physics)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2010-01-28T16:42:34Z
Graduation date
2010-06
Degree
Master of Science
Degree level
Master's
Abstract
The presence of chlorine in the subcratonic lithospheric mantle (SCLM) has been evaluated by compiling the compositional data of fluid inclusions in fibrous diamonds. Chlorine associates with potassium, dissolving in water and forming a KCl-bearing brine with the Cl/(Cl+H2O) molar ratio of 0.05-0.68. To examine the effect of such a KCl-bearing brine on the melting behavior of the SCLM, we conducted experiments in the Mg2SiO4-MgSiO3-H2O and Mg2SiO4-MgSiO3-KCl-H2O systems at 5 GPa and 1100-1700°C. In the Mg2SiO4-MgSiO3-H2O system, the solidus temperature of forsterite+enstatite is ~1230°C. In the Mg2SiO4-MgSiO3-KCl-H2O systems with molar Cl/(Cl+H2O) ratios of 0.2, 0.4 and 0.6, the solidus temperatures are ~1430°C, ~1530°C and ~1580°C, respectively. The increase in the temperature of the solidus demonstrates that KCl elevates the solidus of the Mg2SiO4-MgSiO3-H2O system. Therefore, KCl in the SCLM can prevent melting at the H2O-saturated solidus, and a KCl-bearing fluid can be a robust agent for mantle metasomatism.
Language
English
DOI
doi:10.7939/R3J88M
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: thesis_The existence and the effect of chlorine in the Earth���s mantle8.pdf
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