An ancient reservoir of volatiles in the Moon sampled by lunar meteorite Northwest Africa 10989

Stephant, A.; Anand, M.; Ashcroft, H. O.; Zhao, X.; Hu, Sen; Korotev, R. L.; Strekopytov, Stanislav; Greenwood, Richard C.; Humphreys‐Williams, Emma; Liu, Y.; Tang, Guozhi; Li, Q.; Franchi, I. A.

doi:10.1016/j.gca.2019.07.045

Cited by 16 publications

(10 citation statements)

References 68 publications

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“…Based on the stoichiometric method 39 , 40 , the relative proportions of OH, F, and Cl in the apatite were inferred from the EPMA data. The results confirmed the presence of OH in the apatite grains, and the proportion of OH in the three endmembers of F, Cl, and OH varied from 0 to 0.38 (Supplementary Table 8 ).…”

Section: Resultsmentioning

confidence: 99%

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Liu

Ren

et al. 2022

Nat Commun

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The distribution range, time-varying characteristics, and sources of lunar water are still controversial. Here we show the Chang’E-5 in-situ spectral observations of lunar water under Earth’s magnetosphere shielding and relatively high temperatures. Our results show the hydroxyl contents of lunar soils in Chang’E-5 landing site are with a mean value of 28.5 ppm, which is on the weak end of lunar hydration features. This is consistent with the predictions from remote sensing and ground-based telescopic data. Laboratory analysis of the Chang’E-5 returned samples also provide critical clues to the possible sources of these hydroxyl contents. Much less agglutinate glass contents suggest a weak contribution of solar wind implantation. Besides, the apatite present in the samples can provide hydroxyl contents in the range of 0 to 179 ± 13 ppm, which shows compelling evidence that, the hydroxyl-containing apatite may be an important source for the excess hydroxyl observed at this young mare region.

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Section: Resultsmentioning

confidence: 99%

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Liu

Ren

et al. 2022

Nat Commun

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“…2014; Stephant et al. 2019). Lunar meteorites are randomly sampled from virtually the entire lunar surface, in contrast to the Apollo and Luna samples that were collected from a relatively limited area.…”

Section: Introductionmentioning

confidence: 99%

Lunar meteorite Northwest Africa 11962: A regolith breccia containing records of titanium‐rich lunar volcanism and the high alkali suite

Bechtold

Brandstätter

Pittarello

et al. 2021

Meteorit & Planetary Scien

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Northwest Africa (NWA) 11962 is a lunar regolith breccia composed of a wide range of different clasts. The lunar origin of this meteorite is confirmed by oxygen isotope analysis and the Fe/Mn ratio in pyroxene and olivine. In the present study, the clasts and the matrix of NWA 11962 are characterized by optical and electron microscopy along with electron microprobe analyses and micro‐Raman spectroscopy. The meteorite has a glassy impact melt matrix, which accounts for 35% of the surface area in the two thin sections examined, and which contains a very large variety of different lithic clasts, monomineralic clasts, and glass fragments. The presence of volcanic and impact‐related glass spherules led to the classification of this meteorite as a regolith breccia. Lithic clasts include numerous fragments of quartz monzogabbro and lunar felsite, which are quite rare lithologies in the lunar alkali suite. However, the most abundant components in the breccia are gabbroic clasts. The mineral chemistry of the pyroxenes in the gabbroic clasts and the chemistry of various types of glass fragments in the breccia indicate an origin of the regolith from an area with low‐Ti to high‐Ti mare basalt volcanism. In addition to the peculiar petrographic characteristics of NWA 11962, the possible pairing relationships with other lunar meteorites are discussed.

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“…Both radiogenic and impact-induced heating are thought to mobilize fluids within chondrites (Lewis and Jones 2016;Zhang et al 2016), resulting in redistribution of volatile components and growth of secondary phases. Thus, the elemental and isotopic compositions of volatile-bearing phases in meteorites and other planetary samples have the potential to provide important insights into both planetary volatile reservoirs and processes that operated on their parent bodies (e.g., Jones et al 2014;Stephant et al 2019;Cernok et al 2020). Volatile-bearing phases that retain such information include halides (Jones et al 2016), sulfides (Visser et al 2019), and phosphates (Jones et al 2016).…”

Section: Phosphorus In Meteorites: Knowns and Unknownsmentioning

confidence: 99%

Microtextures in the Chelyabinsk impact breccia reveal the history of Phosphorus‐Olivine‐Assemblages in chondrites

Walton

Baziotis

Černok

et al. 2021

Meteorit & Planetary Scien

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The geochemistry and textures of phosphate minerals can provide insights into the geological histories of parental asteroids, but the processes governing their formation and deformation remain poorly constrained. We assessed phosphorus-bearing minerals in the three lithologies (light, dark, and melt) of the Chelyabinsk (LL5) ordinary chondrite using scanning electron microscope, electron microprobe, cathodoluminescence, and electron backscatter diffraction techniques. The majority of studied phosphate grains appear intergrown with olivine. However, microtextures of phosphates (apatite [Ca 5 (PO 4 ) 3 (OH,Cl,F)] and merrillite [Ca 9 NaMg(PO 4 ) 7 ]) are extremely variable within and between the differently shocked lithologies investigated. We observe continuously strained as well as recrystallized strain-free merrillite populations. Grains with strain-free subdomains are present only in the more intensely shocked dark lithology, indicating that phosphate growth predates the development of primary shock-metamorphic features. Complete melting of portions of the meteorite is recorded by the shock-melt lithology, which contains a population of phosphorus-rich olivine grains. The response of phosphorus-bearing minerals to shock is therefore hugely variable throughout this monomict impact breccia. We propose a paragenetic history for P-bearing phases in Chelyabinsk involving initial phosphate growth via P-rich olivine replacement, followed by phosphate deformation during an early impact event. This event was also responsible for the local development of shock melt that lacks phosphate grains and instead contains P-enriched olivine. We generalize our findings to propose a new classification scheme for Phosphorus-Olivine-Assemblages (Type I-III POAs). We highlight how POAs can be used to trace radiogenic metamorphism and shock metamorphic events that together span the entire geological history of chondritic asteroids.

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An ancient reservoir of volatiles in the Moon sampled by lunar meteorite Northwest Africa 10989

Cited by 16 publications

References 68 publications

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Lunar meteorite Northwest Africa 11962: A regolith breccia containing records of titanium‐rich lunar volcanism and the high alkali suite

Microtextures in the Chelyabinsk impact breccia reveal the history of Phosphorus‐Olivine‐Assemblages in chondrites

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