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Experimental partitioning of halogens and other trace elements between olivine, pyroxenes, amphibole and aqueous fluid at 2 GPa and 900–1,300 °C

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Title: Experimental partitioning of halogens and other trace elements between olivine, pyroxenes, amphibole and aqueous fluid at 2 GPa and 900–1,300 °C
Authors: Fabbrizio, A
Stalder, R
Hametner, K
Günther, D
Marquardt, K
Item Type: Journal Article
Abstract: We present new partition coefficients for various trace elements including Cl between olivine, pyroxenes, amphibole and coexisting chlorine-bearing aqueous fluid in a series of high-pressure experiments at 2 GPa between 900 and 1,300 °C in natural and synthetic systems. Diamond aggregates were added to the experimental capsule set-up in order to separate the fluid from the solid residue and enable in situ analysis of the quenched solute by LA–ICP–MS. The chlorine and fluorine contents in mantle minerals were measured by electron microprobe, and the nature of OH defects was investigated by infrared spectroscopy. Furthermore, a fluorine-rich olivine from one selected sample was investigated by TEM. Results reveal average Cl concentrations in olivine and pyroxenes around 20 ppm and up to 900 ppm F in olivine, making olivine an important repository of halogens in the mantle. Chlorine is always incompatible with Cl partition coefficients D Cl olivine/fluid varying between 10−5 and 10−3, whereas D Cl orthopyroxene/fluid and D Cl clinopyroxene/fluid are ~10−4 and D Cl amphibole/fluid is ~5 × 10−3. Furthermore, partitioning results for incompatible trace element show that compatibilities of trace elements are generally ordered as D amph/fluid ≈ D cpx/fluid > D opx/fluid > D ol/fluid but that D mineral/fluid for Li and P is very similar for all observed silicate phases. Infrared spectra of olivine synthesized in a F-free Ti-bearing system show absorption bands at 3,525 and ~3,570 cm−1. In F ± TiO2-bearing systems, additional absorption bands appear at ~3,535, ~3,595, 3,640 and 3,670 cm−1. Absorption bands at ~3,530 and ~3,570 cm−1, previously assigned to humite-like point defects, profit from low synthesis temperatures and the presence of F. The presence of planar defects could not be proved by TEM investigations, but dislocations in the olivine lattice were observed and are suggested to be an important site for halogen incorporation in olivine.
Issue Date: 1-Aug-2013
Date of Acceptance: 31-May-2013
URI: http://hdl.handle.net/10044/1/70763
DOI: https://dx.doi.org/10.1007/s00410-013-0902-5
ISSN: 0010-7999
Publisher: Springer
Start Page: 639
End Page: 653
Journal / Book Title: Contributions to Mineralogy and Petrology
Volume: 166
Issue: 2
Copyright Statement: © The Author(s) 2013. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
Keywords: Science & Technology
Physical Sciences
Geochemistry & Geophysics
Mineralogy
Halogens
Trace element partitioning
Mantle
Defects
TEM
BRUCITE-PERICLASE EQUILIBRIUM
NOMINALLY ANHYDROUS MINERALS
HIGH-PRESSURE FLUIDS
EARTHS UPPER-MANTLE
ION-BEAM FIB
HYDROGEN INCORPORATION
THERMODYNAMIC DATA
TRIVALENT CATIONS
HIGH-TEMPERATURES
WATER SOLUBILITY
Defects
Halogens
Mantle
TEM
Trace element partitioning
0402 Geochemistry
0403 Geology
Energy
Publication Status: Published
Online Publication Date: 2013-06-19
Appears in Collections:Materials
Faculty of Engineering