Discovery of moganite in a lunar meteorite as a trace of H
            <sub>2</sub>
            O ice in the Moon’s regolith

Kayama, Masahiro; Tomioka, Naotaka; Ohtani, Eiji; Seto, Yusuke; Nagaoka, Hiroshi; Götze, Jens; Miyake, Akira; Ozawa, Seiji; Sekine, Toshimori; Miyahara, Masaaki; Tomeoka, Kazushige; Matsumoto, Megumi; Shoda, Naoki; Hirao, Naohisa; Kobayashi, Takamichi

doi:10.1126/sciadv.aar4378

Cited by 25 publications

(38 citation statements)

References 38 publications

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“…NWA 2727, a member of the NWA 773 clan of lunar meteorites Lunar meteorite NWA 2727 was found in Morocco or Algeria in 2005 (Connolly et al 2006), and is a polymict, mafic breccia belonging to the NWA 773 clan (Bunch et al 2006;Zeigler et al 2007;Kayama et al 2018;Valencia et al 2019). As a whole, the NWA 773 clan consists of a coarsegrained regolith breccia with variable abundances of gabbroic and basaltic lithologies (Valencia et al 2019).…”

Section: Methods/experimentalmentioning

confidence: 99%

“…In addition to the OPB, other types of basaltic clasts with pyroxene phenocrysts have been found in the NWA 773 clan. Basalts with pyroxene phenocrysts in fine pyroxene+ feldspar groundmass occur in NWA 773 (Fagan et al 2003, see their "straw-textured clast") and in NWA 2727 (Kayama et al 2018). Anhedral quartz single crystals (10 to 20 μm in radius) are present in clinopyroxene-phyric basalt (CPB) clasts in NWA 2727 (Kayama et al 2018).…”

Section: Methods/experimentalmentioning

confidence: 99%

“…Basalts with pyroxene phenocrysts in fine pyroxene+ feldspar groundmass occur in NWA 773 (Fagan et al 2003, see their "straw-textured clast") and in NWA 2727 (Kayama et al 2018). Anhedral quartz single crystals (10 to 20 μm in radius) are present in clinopyroxene-phyric basalt (CPB) clasts in NWA 2727 (Kayama et al 2018). The presence of multiple types of basalts indicates that some clasts of the NWA 773 clan formed initially from variable types of volcanism.…”

Section: Methods/experimentalmentioning

confidence: 99%

“…All the spectral data were calibrated by monitoring the position of the O-Si-O bending vibration (464 cm −1 ) in reference standard quartz of high optical grade before and after each measurement. Detailed information on the Raman spectroscopy is shown in Kayama et al (2018). Figure 1 shows false-color elemental mapping of Al (red), Mg (green), and Fe (blue) Kα x-rays, and distinguishes the main minerals of NWA 2727, as shown in the following colors: light green and blue colors indicate olivine; dark green and blue colors indicate pyroxene; red color indicates plagioclase.…”

Section: Analytical Methods For Mineralogy and Petrologymentioning

confidence: 99%

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Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Nagaoka

Fagan

Kayama

et al. 2020

Prog Earth Planet Sci

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An igneous clast from the Northwest Africa 773 (NWA 773) clan of lunar meteorites formed by silicic volcanism on the Moon. The clast was identified in Northwest Africa 2727 (NWA 2727), which is included in the NWA 773 clan. Over 80 mode% of the clast consists of silica + plagioclase + K-Ba-feldspar. The silica phases cristobalite, tridymite, and quartz are all present in the clast, indicating rapid cooling at low pressure in agreement with a volcanic setting. This clast is characterized as a dacite on the basis of mineral modes and whole-rock chemical composition. Olivine and pyroxene in the clast have high Fe/Mg ratios (olivine Fe# > 99, pyroxene Fe# > 99; with Fe# = molar Fe/(Fe + Mg) × 100), suggesting crystallization from a residual liquid after fractionation of more magnesian silicates. The clast is similar in some respects to ferroan gabbro alkaline-phase-ferroan (FG/ARFe) clasts that are inferred to be comagmatic with olivine gabbro (OG) and other mafic lithologies of the NWA 773 clan. However, the high silica concentration and dominance of apatite as the main Ca-phosphate (no merrillite was identified) are distinct from the FG/ARFe clasts. Thus, the dacite clast probably crystallized in a magmatic setting that was independent of the OG and FG/ARFe lithologies. The mafic major element composition, young age, and high KREEP-content of the NWA 773 clan have been used previously to infer an origin from the Procellarum-KREEP terrane (PKT) on the nearside of the Moon. Several candidates for silicic volcanism/plutonism have been identified in the PKT (e.g., Gruithuisen Domes, Hansteen alpha, Lassell Massif). The presence of the dacite lithology provides additional support for an origin in or around PKT for meteorites of the NWA 773 clan, and for complex igneous activity in PKT region.

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Section: Methods/experimentalmentioning

confidence: 99%

Section: Methods/experimentalmentioning

confidence: 99%

Section: Methods/experimentalmentioning

confidence: 99%

Section: Analytical Methods For Mineralogy and Petrologymentioning

confidence: 99%

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Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Nagaoka

Fagan

Kayama

et al. 2020

Prog Earth Planet Sci

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“…The NWA 773 clan is 30-40 Ma younger than the youngest Apollo samples (about ∼3. 16 Ga, 12051 and 12065 samples [5,15]), and provides new opportunities to study the formation and evolution of lunar magmas [20][21][22][23]. Moreover, compared to other younger lunar meteorites such as LAP 02205/NWA 4734, the gabbro clast of NWA 773 has unique geochemical characteristics including KREEP-like rare earth element (REE) patterns, but at lower concentrations [13].…”

Section: Introductionmentioning

confidence: 99%

Petrography and chronology of lunar meteorite Northwest Africa 6950

Bao

Shi

Anderson

et al. 2020

Sci. China Inf. Sci.

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Northwest Africa (NWA) 6950 is an olivine-gabbro lunar meteorite that has a distinctly different petrographic texture from other lunar basalts. In this contribution, we report the petrography, mineralogy, and U-Pb geochronology of baddeleyite and phosphate in this lunar meteorite and make a comparison with other NWA 773 paired meteorites. NWA 6950 consists mainly of coarse-grained olivine, pyroxene, and plagioclase, with minor ilmenite, chromite, troilite, baddeleyite, taenite, and apatite. The abundant rounded to euhedral olivine has a limited Fo ranging from 68 to 69. Pyroxenes include both augite and pigeonite, with a narrow range of Mg#=71-80, and composition, respectively, En 46-52 Fs 12-16 Wo 32-41 and En 58-68 Fs 19-28 Wo 7-20. Plagioclase is mainly anhedral, conforming to the crystal margins of olivine and pyroxene. The plagioclase grains are elongated and several hundreds of microns in length. Raman spectra shows that plagioclase has been transformed into maskelynite, which is very calcic (An 87-95) with low sodium and very low potassium (Ab 4-9 Or 0.6-3.7). The weighted mean 207 Pb/ 206 Pb ages of baddeleyite and phosphate measured using a sensitive high resolution ion micro probe (SHRIMP II) are 3119 ± 16 Ma (n = 9, MSWD = 2.5) (mean squared weighted deviates, MSWD) and 3119 ± 18 Ma (n = 15, MSWD = 2.1), respectively, giving the crystallization age of the meteorite. NWA 6950 has similar mineral compositions, geochemical characteristics, and an almost identical age of crystallization to the magnesian gabbro of the NWA 773 clan. We conclude that NWA 6950 and NWA 773 are paired meteorites, which crystallize at ca. 3119 Ma, and represent magmatic activities in the KREEP (potassium (K), rare earth elements (REE) and phosphorus (P) rich lunar material) region of the Moon.

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Temperature and pressure effects on the structural and vibrational properties of forsterite from density functional theory studies

Chen,

Becker

2024

Phys Chem Minerals

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Discovery of moganite in a lunar meteorite as a trace of H ₂ O ice in the Moon’s regolith

Abstract: Discovery of moganite in a lunar meteorite indicates the possibility of H2O ice accumulated in the Moon’s regolith.

Cited by 25 publications

References 38 publications

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Petrography and chronology of lunar meteorite Northwest Africa 6950

Temperature and pressure effects on the structural and vibrational properties of forsterite from density functional theory studies

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Discovery of moganite in a lunar meteorite as a trace of H 2 O ice in the Moon’s regolith

Abstract: Discovery of moganite in a lunar meteorite indicates the possibility of H2O ice accumulated in the Moon’s regolith.

Cited by 25 publications

References 38 publications

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Petrography and chronology of lunar meteorite Northwest Africa 6950

Temperature and pressure effects on the structural and vibrational properties of forsterite from density functional theory studies

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Product

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Discovery of moganite in a lunar meteorite as a trace of H ₂ O ice in the Moon’s regolith