A lunar hygrometer based on plagioclase-melt partitioning of water

Y. H. Lin, H. Hui, Y. Li, Y. Xu, W. Van Westrenen

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The Moon was initially covered by a magma ocean. Hydrogen detected in plagioclase of ferroan anorthosites, the only available samples directly crystallised from the lunar magma ocean (LMO), can be used to quantify LMO hydrogen content. We performed experiments to determine plagioclase-melt partition coefficients of water under LMO conditions with water contents of co-existing plagioclase and melt quantified using Fourier-Transform Infrared Spectroscopy. Results indicate lunar plagioclase can incorporate approximately one order of magnitude more water than previously assumed. Using measured water contents of lunar plagioclase, this suggests that ~100 μg/g H2O equivalent was present in the residual magma when 95 % of the initial LMO had crystallised. Our results constrain initial LMO water contents to ~ 5 μg/g H2O equivalent if water was conserved throughout LMO evolution. If on the other hand the initial LMO contained >1000 μg/g water as suggested by experiments on LMO crystallisation, >99 % hydrogen degassing occurred during the evolution of the LMO.

Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalGeochemical Perspectives Letters
Volume10
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Hygrometers
plagioclase
partitioning
magma
melt
Water
Water content
Hydrogen
ocean
water
Degassing
Moon
Crystallization
water content
hydrogen
Experiments
anorthosite
degassing
FTIR spectroscopy
partition coefficient

Cite this

@article{a5c6e369ea8a45f28bae46568c54a6f5,
title = "A lunar hygrometer based on plagioclase-melt partitioning of water",
abstract = "The Moon was initially covered by a magma ocean. Hydrogen detected in plagioclase of ferroan anorthosites, the only available samples directly crystallised from the lunar magma ocean (LMO), can be used to quantify LMO hydrogen content. We performed experiments to determine plagioclase-melt partition coefficients of water under LMO conditions with water contents of co-existing plagioclase and melt quantified using Fourier-Transform Infrared Spectroscopy. Results indicate lunar plagioclase can incorporate approximately one order of magnitude more water than previously assumed. Using measured water contents of lunar plagioclase, this suggests that ~100 μg/g H2O equivalent was present in the residual magma when 95 {\%} of the initial LMO had crystallised. Our results constrain initial LMO water contents to ~ 5 μg/g H2O equivalent if water was conserved throughout LMO evolution. If on the other hand the initial LMO contained >1000 μg/g water as suggested by experiments on LMO crystallisation, >99 {\%} hydrogen degassing occurred during the evolution of the LMO.",
author = "Lin, {Y. H.} and H. Hui and Y. Li and Y. Xu and {Van Westrenen}, W.",
year = "2019",
month = "1",
day = "1",
doi = "10.7185/geochemlet.1908",
language = "English",
volume = "10",
pages = "14--19",
journal = "Geochemical Perspectives Letters",
issn = "2410-339X",
publisher = "European Association of Geochemistry",

}

A lunar hygrometer based on plagioclase-melt partitioning of water. / Lin, Y. H.; Hui, H.; Li, Y.; Xu, Y.; Van Westrenen, W.

In: Geochemical Perspectives Letters, Vol. 10, 01.01.2019, p. 14-19.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - A lunar hygrometer based on plagioclase-melt partitioning of water

AU - Lin, Y. H.

AU - Hui, H.

AU - Li, Y.

AU - Xu, Y.

AU - Van Westrenen, W.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The Moon was initially covered by a magma ocean. Hydrogen detected in plagioclase of ferroan anorthosites, the only available samples directly crystallised from the lunar magma ocean (LMO), can be used to quantify LMO hydrogen content. We performed experiments to determine plagioclase-melt partition coefficients of water under LMO conditions with water contents of co-existing plagioclase and melt quantified using Fourier-Transform Infrared Spectroscopy. Results indicate lunar plagioclase can incorporate approximately one order of magnitude more water than previously assumed. Using measured water contents of lunar plagioclase, this suggests that ~100 μg/g H2O equivalent was present in the residual magma when 95 % of the initial LMO had crystallised. Our results constrain initial LMO water contents to ~ 5 μg/g H2O equivalent if water was conserved throughout LMO evolution. If on the other hand the initial LMO contained >1000 μg/g water as suggested by experiments on LMO crystallisation, >99 % hydrogen degassing occurred during the evolution of the LMO.

AB - The Moon was initially covered by a magma ocean. Hydrogen detected in plagioclase of ferroan anorthosites, the only available samples directly crystallised from the lunar magma ocean (LMO), can be used to quantify LMO hydrogen content. We performed experiments to determine plagioclase-melt partition coefficients of water under LMO conditions with water contents of co-existing plagioclase and melt quantified using Fourier-Transform Infrared Spectroscopy. Results indicate lunar plagioclase can incorporate approximately one order of magnitude more water than previously assumed. Using measured water contents of lunar plagioclase, this suggests that ~100 μg/g H2O equivalent was present in the residual magma when 95 % of the initial LMO had crystallised. Our results constrain initial LMO water contents to ~ 5 μg/g H2O equivalent if water was conserved throughout LMO evolution. If on the other hand the initial LMO contained >1000 μg/g water as suggested by experiments on LMO crystallisation, >99 % hydrogen degassing occurred during the evolution of the LMO.

UR - http://www.scopus.com/inward/record.url?scp=85068133404&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068133404&partnerID=8YFLogxK

U2 - 10.7185/geochemlet.1908

DO - 10.7185/geochemlet.1908

M3 - Article

VL - 10

SP - 14

EP - 19

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

SN - 2410-339X

ER -