Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase

Tian, Heng-Ci; Yang, Wei; Zhang, Di; Zhang, Huijuan; Jia, Lihui; Wu, Shitou; Lin, Yangting; Li, Xianhua; Wu, Fuyuan

doi:10.2138/am-2022-8570

Cited by 13 publications

(3 citation statements)

References 56 publications

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“…Ballistic sedimentation models (Liu et al, 2021;Xie et al, 2020) predicted that up to 10%-40% of exotic materials might exist in the sampling unit. However, sample analyses revealed abundant locally derived basaltic fragments in the Chang'E-5 regolith that have a uniform crystallization age of ∼2.0 Ga (Che et al, 2021;Li et al, 2021) and coherent petrographic characteristics that can be ascribable to a single episode of lava flows (C. L. Li, Hu, et al, 2022;Tian et al, 2021Tian et al, , 2022. Structurally homogeneous impact glass spherules discovered in the regolith also exhibit compositions similar to that of the basalt clasts (Yang et al, 2022), further supporting the dominance of locally evolved materials in the regolith.…”

Section: Introductionmentioning

confidence: 99%

Intricate Regolith Reworking Processes Revealed by Microstructures on Lunar Impact Glasses

Pan

Yang

et al. 2022

JGR Planets

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Glasses cooled from impact melt and vapor are a common component in lunar regolith, carrying important information about protolith composition, regolith formation, and impact flux on the Moon. Interpretations, however, are frequently challenged due to widespread ambiguity in determining their provenances. Regolith samples returned by China's Chang'E-5 mission provide a unique opportunity to study the microscopic mechanism of regolith reworking on the Moon, because as evidenced by the coherent radioisotope ages and petrographic characteristics of basaltic clasts in the regolith, the Chang'E-5 regolith was mainly evolved from local mare materials, containing minor exotic components. Here, we report 153 glass particles larger than 20 μm in diameters that were screened from 500 mg of Chang'E-5 regolith. Most glass particles have rotational shapes and contain structural and/or compositional heterogeneities in interiors, and geochemical analyses reveal a dominant origin as impact melt of local mare materials. Surfaces of the impact glasses are observed to have abundant protruded and dented microstructures, which are classified as different groups based on their morphology and geochemistry. Similar microstructures were observed on impact spherules collected by the Apollo and Luna missions, but those on the Chang'E-5 impact glasses were formed without substantial involvement of exotic ejecta. Microstructures such as silicate melt pancakes that frequently exhibit flow spikes at margins, nano-phase iron-rich mounds that are arranged with semi-equidistant spaces in curves and patches, spatially clustered microcraters that are indicative of secondary impacts, and blunt linear scratches with terminal particles all suggest that regolith reworking mainly occurred among local materials at low speeds.Plain Language Summary Regolith particles on the Moon exhibit an abundance of small-scale surface texture or microstructures that were formed during regolith reworking. Lunar impact glasses are mainly melted from surface regolith, and microstructures on their surfaces record the history of subsequent regolith reworking. The possible contribution of exotic ejecta in regolith gardening is an interesting topic in lunar science. However, resolving this issue has been a persistent difficulty by both remote observations and sample analyses. China's Chang'E-5 mission returned regolith samples from one of the youngest mare units on the Moon, and earlier sample analyses revealed little exotic components. In 500 mg of Chang'E-5 regolith, we handpicked 153 glass particles that are larger than 20 μm. Most of the particles are heterogeneous impact glasses that contain voids and unmelted fragments, and geochemical analyses showed that the remaining structurally homogeneous particles were also impact glasses formed from local regolith. Based on high-resolution microscopic imaging and elemental mapping, we recognized and classified the abundant protruded and dented microstructures on the glass particles. Morphology and crosscutting relationship of t...

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Section: Introductionmentioning

confidence: 99%

Intricate Regolith Reworking Processes Revealed by Microstructures on Lunar Impact Glasses

Pan

Yang

et al. 2022

JGR Planets

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“…Therefore, the CE5 sample is the low-Ca type of moon sample. In terms of Ti content, moon samples can be divided into three types: high Ti (TiO 2 ≥ 6%), low Ti (1% ≤ TiO 2 < 6%), and very low Ti (TiO 2 < 1%) [11]. The content of TiO 2 of CE5 is 5.43%, which indicates that the CE5 sample is the low Ti type of moon sample.…”

Section: Geochemical Signaturesmentioning

confidence: 99%

“…The successful return of Chang'E-5 (CE5) has marked China as the third country to retrieve moon samples after the United States and the former Soviet Union. Studies on the returned samples have been an interesting and hot topic in geochemistry recently [1][2][3][4][5][6][7][8][9][10][11]. Elemental abundance is a basic topic in geochemistry, such as in the Earth [12][13][14][15][16]; therefore, the elemental composition of CE5 samples and moon samples from the Apollo and Luna missions is very attractive to geochemists.…”

Section: Introductionmentioning

confidence: 99%

Elemental Abundances of Moon Samples Based on Statistical Distributions of Analytical Data

et al. 2022

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The successful return of Chang’E-5 (CE5) samples urges the hot topic of the study of the Moon in geochemistry. The elemental data of the analyzed moon samples reported in the literature were collected to determine the elemental abundances in moon samples. Based on 2365 analytical records of moon samples from ten missions of Apollo, Luna, and CE5, elemental abundances of 11 major oxides including Cr2O3, 50 trace elements including Ti, P, Mn, Cr, and 15 rare earth elements (REEs) including Y are derived based on statistical distributions of normal, log-normal, and additive log-ratio transformation, respectively. According to the value of 13.5% CaO content, moon samples are classified into two types, as low-Ca and high-Ca samples, whose elemental abundances are also calculated respectively based on the methods used in the total moon samples. With respect to the mid-ocean ridge basalt (MORB) of the Earth, moon samples (including the Moon, low-Ca, and high-Ca samples) are rich in Cr, REEs, Th, U, Pb, Zr, Hf, Cs, Ba, W, and Be and poor in Na, V, Cu, and Zn in terms of their concentrations, and are enriched in Cr and depleted in Na, K, Rb, P, V, Cu, Zn in spider diagrams. The CE5 sample is a low-Ca type of moon sample and is clearly rich in Ti, Fe, Mn, P, Sc, REEs, Th, U, Nb, Ta, Zr, Hf, Sr, Ba, W, and Be and poor in Mg, Al, Cr, and Ni in terms of their concentrations relative to the moon or the low-Ca samples. If compared with the moon sample, the CE5 sample is also clearly rich in K, REE, and P.

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Elemental and Sr isotopic compositions of plagioclase as an indicator of lunar source-rock type: Insights from Chang'e 5 plagioclase fragments

Zhang,

Yang,

Chen

et al. 2024

Icarus

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Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase

Cited by 13 publications

References 56 publications

Intricate Regolith Reworking Processes Revealed by Microstructures on Lunar Impact Glasses

Intricate Regolith Reworking Processes Revealed by Microstructures on Lunar Impact Glasses

Elemental Abundances of Moon Samples Based on Statistical Distributions of Analytical Data

Elemental and Sr isotopic compositions of plagioclase as an indicator of lunar source-rock type: Insights from Chang'e 5 plagioclase fragments

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