Petrogenesis of lunar impact melt rock meteorite Oued Awlitis 001

Wittmann, A.; Korotev, R. L.; Jolliff, Bradley L.; Nishiizumi, K.; Jull, A. J. T.; Caffee, Marc W.; Zanetti, M.; Irving, A. J.

doi:10.1111/maps.13218

Cited by 8 publications

(3 citation statements)

References 115 publications

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“…Similarly, at the Lonar Crater, India, which is a basaltic target with highly calcic plagioclase, no PDFs have been identified despite abundant examples of diaplectic glass (Kieffer et al, 1976;Jaret et al, 2015). However, we are aware of two exceptions to the high-Ca plagioclase resistance to PDFs, both in lunar anorthite, from the meteorite Oued Awlitis 001 (Wittmann et al, 2019), and Apollo sample 10046 (Dence et al, 1970). This indicates a strong compositional (and therefore crystallographic) effect on whether or not PDFs form in feldspars.…”

Section: Planar Microstructuresmentioning

confidence: 94%

Shock effects in feldspars: An overview

Pickersgill

Jaret

Pittarello

et al. 2021

Large Meteorite Impacts and Planetary Evolution VI

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Feldspars are the dominant mineral in the crust of most terrestrial planetary bodies, including Earth, Earth’s moon, and Mars, as well as in asteroids, and thus in meteorites. These bodies have experienced large numbers of hypervelocity impact events, and so it is important to have a robust understanding of the effects of shock waves exerted on feldspars. However, due to their optical complexity and susceptibility to weathering, feldspars are underutilized as shock barometers and indicators of hypervelocity impact. Here, we provide an overview of the work done on shocked feldspars so far, in an effort to better frame the current strengths and weaknesses of different techniques, and to highlight some gaps in the literature.

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Section: Planar Microstructuresmentioning

confidence: 94%

Shock effects in feldspars: An overview

Pickersgill

Jaret

Pittarello

et al. 2021

Large Meteorite Impacts and Planetary Evolution VI

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“…We provide below a summary of the petrography. Dhofar 1528 is a feldspathic breccia that was found in Oman and experienced moderate terrestrial weathering (Wittmann et al., 2018). It has a vitric matrix (30%) and abundant clasts (70%), and the clast contents are primarily composed of monomict mineral fragments such as plagioclase (An 95–99 ), pyroxene (Fs 21–29 Wo 8–11 ), and olivine (Fo 63 and Fo 83–95 ; Ruzicka et al., 2014; Wittmann et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

SIMS U‐Pb dating of micro‐zircons in the lunar meteorites Dhofar 1528 and Dhofar 1627

Zhang,

Lin,

Hao

et al. 2023

Meteorit & Planetary Scien

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About half of the lunar meteorites in our collections are feldspathic breccias. Acquiring geochronologic information from these breccias is challenging due to their low radioactive‐element contents and their often polymict nature. We used high‐spatial‐resolution (5 μm) NanoSIMS (nanoscale secondary ion mass spectrometry) U‐Pb dating technique to date micro‐zircons in the lunar feldspathic meteorites Dhofar 1528 and Dhofar 1627. Three NanoSIMS dating spots of two zircon grains from Dhofar 1528 show a discordia with an upper intercept at 4354 ± 76 Ma and a lower intercept at 332 ± 1407 Ma (2σ, MSWD = 0.01, p = 0.91). Three spots of two zircon grains in Dhofar 1627 define a discordia with an upper intercept at 3948 ± 30 Ma and a lower intercept at 691 ± 831 Ma (2σ, MSWD = 0.40, p = 0.53). Both samples likely experienced shock metamorphism caused by impacts. Based on the clastic nature, lack of recrystallization and the consistent U‐Pb and Pb‐Pb dates of the zircons in Dhofar 1528, the U‐Pb date of 4354 Ma is interpreted as the crystallization age of its Mg‐suite igneous precursor. Some of the Dhofar 1627 zircons show poikilitic texture, a crystallization from the matrix impact melt, so the U‐Pb date of 3948 Ma corresponds to an impact event, likely the Imbrium basin‐forming event. These data are the first radiometric ages for these two meteorites and demonstrate that in situ (high spatial resolution) U‐Pb dating has potential for extracting geochronological information about igneous activities and impact events from lunar feldspathic and polymict breccias.

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“…The large numbers of impact craters and the several-meters-thick lunar soil layer show that the lunar crust has experienced a large number of meteor impacts [11]. The shock process has altered the overall texture of the lunar meteorites, which record important information about the shock events, and thus provides evidence about the metamorphism of the lunar rocks after the shock (e.g., [12][13][14]).…”

Section: Introductionmentioning

confidence: 99%

Petrography and Shock Metamorphism of the Lunar Breccia Meteorite NWA 13120

et al. 2021

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Lunar meteorites are the fragments of rocks that fell on Earth because of the impacts of asteroids on the Moon. Such rocks preserve information about the composition, evolutionary process, and shock history of the lunar surface. NWA 13120 is a recently discovered lunar breccia meteorite having features of strong shock, which is composed of lithic and mineral clasts in a matrix of very fine-grained (<10 μm) and recrystallized olivine-plagioclase with a poikilitic-like texture. As the most abundant lithic clasts, the crystalline impact melt (CIM) clasts can be divided into four types according to their texture and mineral composition: (1) anorthosites or troctolitic anorthosite with a poikilitic-like texture, but the mineral content is different from that of the matrix; (2) anorthosites containing basaltic fragments and rich in vesicles; (3) troctolitic anorthosite containing metamorphic olivine mineral fragments; (4) troctolitic anorthosite containing troctolite fragments. Based on the petrology and mineralogy, NWA 13120 is a lunar meteorite that was derived from the ferrous anorthosite suite (FANs) of the lunar highlands, while its texture suggests it is a crystalline impact melt breccia. In addition, we infer that the parent rock of NWA 13120 is a lunar regolith breccia enriched in glass fragments. During the shock process, at pressures of more than 20 GPa, all plagioclase fragments were transformed into maskelynites, and olivine fragments occurred metamorphism. The post-shock temperature led to the partial melting of the basaltic fragments. Subsequently, all glass with diverse components in the parent rock were devitrified and recrystallized, forming the common olivine-plagioclase poikilitic-like texture and different CIM clasts. Meanwhile, the devitrification of maskelynite formed the accumulation of a large number of plagioclase microcrystals. Therefore, NWA 13120 is a meteorite of great significance for understanding the local shock metamorphism of lunar rocks on the lunar surface.

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Petrogenesis of lunar impact melt rock meteorite Oued Awlitis 001

Cited by 8 publications

References 115 publications

Shock effects in feldspars: An overview

Shock effects in feldspars: An overview

SIMS U‐Pb dating of micro‐zircons in the lunar meteorites Dhofar 1528 and Dhofar 1627

Petrography and Shock Metamorphism of the Lunar Breccia Meteorite NWA 13120

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