Fluorine and chlorine abundances in lunar apatite: Implications for heterogeneous distributions of magmatic volatiles in the lunar interior

McCubbin, F. M.; Jolliff, Bradley L.; Nekvasil, H.; Carpenter, P. K.; Zeigler, R. A.; Steele, A.; Elardo, S. M.; Lindsley, D. H.

doi:10.1016/j.gca.2011.06.017

Cited by 149 publications

(168 citation statements)

References 102 publications

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“…McCubbin et al [65] investigated a norite clast in an impact-melt breccia. They reported a paucity of apatite in all of the magnesian-and alkali-suite samples they studied.…”

Section: Ii) Noritesmentioning

confidence: 99%

Understanding the origin and evolution of water in the Moon through lunar sample studies

Anand

Tartèse

Barnes

2014

Phil. Trans. R. Soc. A.

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A paradigm shift has recently occurred in our knowledge and understanding of water in the lunar interior. This has transpired principally through continued analysis of returned lunar samples using modern analytical instrumentation. While these recent studies have undoubtedly measured indigenous water in lunar samples they have also highlighted our current limitations and some future challenges that need to be overcome in order to fully understand the origin, distribution and evolution of water in the lunar interior. Another exciting recent development in the field of lunar science has been the unambiguous detection of water or water ice on the surface of the Moon through instruments flown on a number of orbiting spacecraft missions. Considered together, sample-based studies and those from orbit strongly suggest that the Moon is not an anhydrous planetary body, as previously believed. New observations and measurements support the possibility of a wet lunar interior and the presence of distinct reservoirs of water on the lunar surface. Furthermore, an approach combining measurements of water abundance in lunar samples and its hydrogen isotopic composition has proved to be of vital importance to fingerprint and elucidate processes and source(s) involved in giving rise to the lunar water inventory. A number of sources are likely to have contributed to the water inventory of the Moon ranging from primordial water to meteorite-derived water ice through to the water formed during the reaction of solar wind hydrogen with the lunar soil. Perhaps two of the most striking findings from these recent studies are the revelation that at least some portions of the lunar interior are as water-rich as some Mid-Ocean Ridge Basalt source regions on Earth and that the water in the Earth and the Moon probably share a common origin.

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“…McCubbin et al [65] investigated a norite clast in an impact-melt breccia. They reported a paucity of apatite in all of the magnesian-and alkali-suite samples they studied.…”

Section: Ii) Noritesmentioning

confidence: 99%

Understanding the origin and evolution of water in the Moon through lunar sample studies

Anand

Tartèse

Barnes

2014

Phil. Trans. R. Soc. A.

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“…Apatite, Ca 5 (PO 4 ) 3 (F, Cl, OH), is a common accessory phase in igneous rocks that takes all major magmatic volatiles (OH, C, S, Cl, F) into its crystal structure. It has recently been used to elucidate the volatile contents of silicate melts in terrestrial 12,13,14 and extraterrestrial 15,16 environments. Apatite offers several important benefits for the determination of pre-eruptive magmatic volatile contents compared to the widely used 'melt inclusion' approach.…”

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confidence: 99%

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

et al. 2016

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. (2016) 'Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions.', Nature geoscience., 9 (3). pp. 249-254. Further information on publisher's website:http://dx.doi.org/10.1038/NGEO2639Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Volatile variations in apatite and hydrous glassesThe volatile composition of apatite relates to that of its host liquid by a set of exchange reactions between F, Cl and OH, for example:where exchange coefficients, K, are constant at a given pressure (P) and temperature (T) (ref. 12), f is fugacity, X is mole fraction and superscripts l and Ap denote the liquid and apatite phases, respectively. We measured F, Cl and OH directly using secondary ion mass spectrometry and electron microprobe analysis (see Supplementary Methods). We neglect 4 sulphur, because S diffusion in apatite is inhibited by a coupled substitution 19 , and equilibrium is not maintained on short timescales. Apatite compositions from Astroni 1 show a negative correlation between X F and X OH and a weaker negative correlation between X Cl and X OH (where X F , X Cl and X OH are the mole fractions of F, Cl and OH, respectively;Supplementary Table 1), demonstrating this exchange of components within the crystal volatile site. Some crystals are slightly non-stoichiometric, within the range reported in other studies 20 . We focus on mole fraction ratios as these relate to liquid composition, pressure and temperature through relationships such as equation (1). Data show a positive correlation between X Cl /X OH and X F /X OH ( Fig. 2a), with one low-X Cl , high-X F outlier. In general, X F /X Cl is constant within error, except in the outlier which has high X F /X Cl ( Fig. 2b). Clinopyroxenehosted apatite inclusions extend to higher X halogen /X OH ratios than biotite-hosted apatite inclusions. Both clinopyroxene-and biotite-hosted inclusions extend to higher X halogen /X OH ratios than apatite microphenocrysts that were in contact with melt until eruption. The overall X halogen /X OH trend is apparently linear, suggesting that there was no significant relative change in F or Cl compatibility during apatite crystallization. (Fig. 3a-c). However, matrix glasses have low H 2 O contents relative to both clinopyroxene-and biotite-hosted melt inclusions, typically <1 wt% (Fig. 3d). Modelling fractionation and volatile saturationWe model magma evolution in the Campi Flegrei system using the Rhyolite-MELTS thermodynamic software 23,24, 25,26 Disc...

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“…2) should give the best estimate of magmatic water. More important is the fact that evolved magmas with high Cl/F can crystallise apatite that generally excludes OH -, regardless of the water content of the magma (McCubbin et al, 2011;Boyce et al, 2014). Estimated Cl/F of magmas from mare basalts, alkali suite, and KREEP-rich rocks show a progression toward higher Cl/F as magma compositions become more K-rich (Fig.…”

Section: Figurementioning

confidence: 99%

Water in alkali feldspar: The effect of rhyolite generation on the lunar hydrogen budget

Mills¹,

Simon²,

Alexander³

et al. 2016

Geochem. Persp. Let.

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Fluorine and chlorine abundances in lunar apatite: Implications for heterogeneous distributions of magmatic volatiles in the lunar interior

Cited by 149 publications

References 102 publications

Understanding the origin and evolution of water in the Moon through lunar sample studies

Understanding the origin and evolution of water in the Moon through lunar sample studies

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

Water in alkali feldspar: The effect of rhyolite generation on the lunar hydrogen budget

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