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A lunar hygrometer based on plagioclase-melt partitioning of water

Y.H. Lin1,

1Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands

H. Hui2,3,

2State Key Laboratory for Mineral Deposits Research & Lunar and Planetary Science Institute, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Dadao, Nanjing 210023, China
3CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

Y. Li4,

4Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Tianhe District, Guangzhou 510640, China

Y. Xu2,

2State Key Laboratory for Mineral Deposits Research & Lunar and Planetary Science Institute, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Dadao, Nanjing 210023, China

W. van Westrenen1

1Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Lin, Y.H., Hui, H., Li, Y., Xu, Y., van Westrenen, W. (2019) A lunar hygrometer based on plagioclase-melt partitioning of water. Geochem. Persp. Let. 10, 14–19.

Netherlands Organization for Scientific Research (N.W.O) Vici grant and N.W.O.

Geochemical Perspectives Letters v10  |  doi: 10.7185/geochemlet.1908
Received 5 December 2018  |  Accepted 25 February 2019  |  Published 26 March 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY 4.0




Figure 1 Backscattered electron (BSE) images of representative experimental run products (Pl2_LBS7H, 0.4 GPa – 1200 °С; and 2018_Pl3_LBS7H, 0.3 GPa – 1160 °С). Px = pyroxene; Plag = plagioclase.
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Figure 2 Representative unpolarised infrared spectra of plagioclase, normalised to 1 cm thickness. Spectra are shifted vertically to facilitate comparison.
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Table 1 Summary of experimental conditions and water contents of run products in our experiments and literature data.
SampleConditionsPlagioclaseGlassWater partition
coefficient
Oxygen fugacity
P (GPa)T °СDuration (h)OH
(μg/g  H2O)
n1 s.d.OH (wt.% H2O)n1 s.d.Dplag-melt1 s.d.Oxygen bufferLog
(ƒO2)
This study
Pl1_LBS6H0.411601458.21117.91.0390.160.0060.0017Graphite–COH (C–COH)-10.4
Pl2_LBS7H12001663.2932.80.35100.020.0180.0092-10.0
Pl3_LBS8H_111602296.0428.80.24120.090.0400.0120-10.4
Pl4_LBS8H_211801485.5533.80.6380.040.0140.0054-10.2
Pl5_LBS8H_311801899.1636.40.32100.010.0300.0112-10.2
2018_Pl2_LBS8H11702473.4717.00.2280.020.0340.0083-10.3
2018_Pl17_LBS8H11802442.286.641.7490.010.0020.0004-10.2
2018_Pl21_LBS5H11902454.2614.20.1380.010.0430.0116-10.1
2018_Pl3_LBS7H0.311602461.1712.60.13110.0040.0460.0096Iron-Wustite (IW)-12.4
Caseres et al. (2017)

Caseres, J.R., Mosenfelder, J.L., Hirschmann, M.M. (2017) Partitioning of hydrogen and fluorine between feldspar and melt under the conditions of lunar crust formation. Lunar and Planetary Science Conference 48, 2303.

1#0.8115082110.360.0030.0230.003Iron-Wustite (IW)-12.3
2#11860.650.0080.0180.001-12.3
Hamada et al. (2013)

Hamada, M., Ushioda, M., Fujii, T., Takahashi, E. (2013) Hydrogen concentration in plagioclase as a hygrometer of arc basaltic melts: Approaches from melt inclusion analyses and hydrous melting experiments. Earth and Planetary Science Letters 365, 253–262.

MTL040.3511302489.813.53.700.560.0020.0004> Ni–NiO (NNO)
MTL0511702480.812.12.500.380.0030.0005
MTL1712202435.95.40.900.140.0040.0006
MTL2211302436.05.42.300.350.0020.0002-4.7
MTL2611602430.14.50.700.110.0040.0006
MTL2911702445.46.80.900.140.0050.0008-5.2
MTL3312302444.46.71.000.150.0040.0007-5.8
MTL3710702411116.64.700.710.0020.0004-5.2
MTL3911002482.912.43.500.530.0020.0004
MTL4011002412118.24.600.690.0030.0004-4.7
MTL4110502411917.86.000.900.0020.0003
Melt Inclusion
Pl19-MI15.32.30.320.050.0050.0007Fe2SiO4–Fe3O4–SiO2
(FMQ)
Pl21-MI10.61.60.240.040.0040.0007
Pl22-MI16.42.50.260.040.0060.0009

Note: n, number of analysed plagioclases; s.d., 1 sigma standard deviation; Log ƒO2(buffer) corrected in the Supplementary Information;
Melt inclusion data not used in this study because we do not know exact T, P, and whether there was any water loss from the inclusions after formation;
The latest infrared absorption coefficient (Mosenfelder et al., 2015 Mosenfelder, J.L., Rossman, G.R., Johnson, E.A. (2015) Hydrous species in feldspars: A reassessment based on FTIR and SIMS. American Mineralogist 100, 1209–1221. ) was used for calibrating water contents of all plagioclases.

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Figure 3 Partition coefficients of water between plagioclase and melt from this study and literature data (Hamada et al., 2013

Hamada, M., Ushioda, M., Fujii, T., Takahashi, E. (2013) Hydrogen concentration in plagioclase as a hygrometer of arc basaltic melts: Approaches from melt inclusion analyses and hydrous melting experiments. Earth and Planetary Science Letters 365, 253–262.

; Caseres et al., 2017

Caseres, J.R., Mosenfelder, J.L., Hirschmann, M.M. (2017) Partitioning of hydrogen and fluorine between feldspar and melt under the conditions of lunar crust formation. Lunar and Planetary Science Conference 48, 2303.

), plotted versus (a) oxygen fugacity, and (b) water concentration in silicate melt. Melt inclusion data (Hamada et al., 2013

Hamada, M., Ushioda, M., Fujii, T., Takahashi, E. (2013) Hydrogen concentration in plagioclase as a hygrometer of arc basaltic melts: Approaches from melt inclusion analyses and hydrous melting experiments. Earth and Planetary Science Letters 365, 253–262.

) in the dotted box are not used in this study because the formation temperature of these inclusions and the degree of water loss from inclusions after formation are uncertain.
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