Experimental determination of F and Cl partitioning between lherzolite and basaltic melt |
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| Authors: | Célia Dalou Kenneth T Koga Nobumichi Shimizu Julien Boulon and Jean-Luc Devidal |
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| Institution: | (1) Laboratoire Magmas et Volcans, Clermont Universit?, Universit? Blaise Pascal, BP 10448, 63000 Clermont-Ferrand, France;(2) CNRS, UMR 6524, LMV, 63038 Clermont-Ferrand, France;(3) IRD, R 163, LMV, 63038 Clermont-Ferrand, France;(4) Woods Hole Oceanographic Institution, Woods Hole, MA 02453, USA;(5) Laboratoire de M?t?orologie Physique, Clermont Universit?, Universit? Blaise Pascal, BP 10448, 63000 Clermont-Ferrand, France |
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| Abstract: | We experimentally determined F and Cl partition coefficients together with that of 19 trace elements (including REE, U-Th,
HFSE and LILE) between basaltic melt and lherzolite minerals: olivine, orthopyroxene, clinopyroxene, plagioclase and garnet.
Under conditions from 8 to 25 kbars and from 1,265 to 1,430°C, compatibilities of F and Cl are globally ordered as D
Cpx/melt > D
Opx/melt > D
Grt/melt > D
Ol/melt > D
Plag/melt, and D
F
mineral/melt is larger than D
Clmineral/melt. Four other major results were brought to light. (1) Chlorine partition coefficients positively correlate with the jadeite
component in orthopyroxene, and increase of the CaTs component promotes Cl incorporation in clinopyroxene. (2) Variations
of fluorine partition coefficients correlate strongly with melt viscosity. (3) F and Cl partition coefficients correlate with
the Young’s modulus (E
0) of pyroxene octahedral sites (M sites) and with Raman vibrational modes of pyroxenes. This demonstrates a fundamental interaction
between the M site of pyroxenes and the incorporation of F and Cl. (4) We also determined the parameters of the lattice-strain
model applied to 3+ cation trace elements for the two M sites in orthopyroxene and clinopyroxene: D
0M1, D
0M2, r
0M1, r
0M2, E
0M1 and E
0M2. |
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| Keywords: | |
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