Fe and Mg Isotope Compositions Indicate a Hybrid Mantle Source for Young Chang’E 5 Mare Basalts

Jiang, Yun; Kang, Jinting; Liao, Shiyong; Elardo, S. M.; Zong, Keqing; Wang, Sijie; Nie, Chang; Li, Peiyi; Yin, Zongjun; Huang, Fang; Hsu, Weibiao

doi:10.3847/2041-8213/acbd31

Cited by 24 publications

(3 citation statements)

References 71 publications

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“…Nevertheless, the average bulk clast composition is similar to the TiO 2 content ($4.5 wt%) of the CE-5 landing site (Tian et al, 2021), determined using data obtained from the Lunar Prospector mission (Prettyman et al, 2006). The melts in equilibrium with CE-5 basaltic olivines (Zhang et al, 2022) and the Mg isotope compositions of CE-5 basalts (Jiang et al, 2023) suggested to previous workers that the mare basalts could have originated from a low-Ti lunar mantle source, consistent with classifications based on bulk rock compositions (He et al, 2022;Tian et al, 2021). In contrast, the mineralogy and the mineral chemistry of some CE-5 basaltic clasts seem to be in accord with the petrogenesis of a high-Ti basalt (Che et al, 2021;Jiang et al, 2022).…”

Section: Introductionsupporting

confidence: 52%

“…The low-melting temperature and the low assimilation degree of the CE-5 basalts suggest that assimilation may have occurred during magma flow on the Moon's surface (Figure 11a), similar to basaltic melts on Earth and to Apollo 14 high-Al basalts on the Moon (e.g., Crisp & Baloga, 1994;Griffiths, 2000;Hui et al, 2011Hui et al, , 2013Keszthelyi & Self, 1998). This surface assimilation process (Figure 11a) is different from KREEP assimilation of CE-5 basalt in the mantle source region (Figure 11b) proposed by Zong et al (2022) using the bulk composition of CE-5 soil or Jiang et al (2023) using the Fe and Mg isotope compositions of CE-5 basalt clasts. Our assimilation model indicates that KREEPbearing basaltic fragments, including KREEP basalt fragments and KREEP basaltic impact melt breccia fragments, in the lunar regolith could have been entrained into the interior of CE-5 magma in this process (Figure 11a; Crisp & Baloga, 1994;Hui et al, 2011).…”

Section: Kreep Assimilation At the Ce-5 Landing Sitementioning

confidence: 82%

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Petrogenesis of Chang'E‐5 young mare low‐Ti basalts

Li,

Hui,

et al. 2023

Meteorit & Planetary Scien

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The regolith samples returned by the Chang'E‐5 mission (CE‐5) contain the youngest radiometrically dated mare basaltic clasts, which provide an opportunity to elucidate the magmatic activities on the Moon during the late Eratosthenian. In this study, detailed petrographic observations and comprehensive geochemical analyses were performed on the CE‐5 basaltic clasts. The major element concentrations in individual plagioclase grain of the CE‐5 basalts may vary slightly from core to rim, whereas pyroxene has clear chemical zonation. The crystallization sequence of the CE‐5 mare basalts was determined using petrographic and geochemical relations in the basaltic clasts. In addition, both fractional crystallization (FC) and assimilation and fractional crystallization models were applied to simulate the chemical evolution of melt equilibrated with plagioclase in CE‐5 basalts. Our results reveal that the melt had a TiO2 content of ~3 wt% and an Mg# of ~45 at the onset of plagioclase crystallization, suggesting a low‐Ti parental melt of the CE‐5 basalts. The relatively high FeO content (>14.5 wt%) in melt equilibrated with plagioclase could have resulted in extensive crystallization of ilmenite, unlike in Apollo low‐Ti basalts. Furthermore, our calculations showed that the geochemical evolution of CE‐5 basaltic melt could not have occurred in a closed system. On the contrary, the CE‐5 basalts could have assimilated mineral, rock, and glass fragments that have higher concentrations of KREEP elements (potassium, rare earth elements, and phosphorus) in the regolith during magma flow on the Moon's surface. The presence of the KREEP signature in the CE‐5 basalts is consistent with literature remote sensing data obtained from the CE‐5 landing site. These KREEP‐bearing fragments could originate from KREEP basaltic melts that may have been emplaced at the landing site earlier than the CE‐5 basalts.

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Section: Introductionsupporting

confidence: 52%

Section: Kreep Assimilation At the Ce-5 Landing Sitementioning

confidence: 82%

Petrogenesis of Chang'E‐5 young mare low‐Ti basalts

Li,

Hui,

et al. 2023

Meteorit & Planetary Scien

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“…Further, we have considered variations of melt REE content during fractional crystallisation which is expected to have played a significant role in crystallisation of the NWA 10597 sample and of lunar basalts in general (Chen et al 2019;Jiang et al 2023). In detail, we employed bulk rock and mineral chemistry data to calculate lunar-relevant REE partition coefficients for the most abundant minerals in the studied sample (i.e.…”

Section: Fractionation Of Lunar Basaltic Melts and Apatite Saturationmentioning

confidence: 99%

Parameterized model for trace-element partitioning between apatite and silicate melt: effect of apatite/melt composition and temperature with implications for lunar basalts

Jirků,

Špillar,

Fabbrizio

2023

Preprint

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We present new parameterized lattice strain models to predict the apatite/silicate melt partition coefficients of the rare earth elements (REE) and Y in natural magmatic systems as a function of temperature and melt composition with high accuracy and precision. We collected published experimental REE and Y partition coefficients for apatite coexisting with melt ranging from picrobasaltic to rhyolitic and phonolitic composition. Resulting dataset was analysed using the lattice strain model to assess the data quality. The three lattice strain parameters (D0, r0, and E) were subjected to a multivariate nonlinear least-squares analysis as a function of intensive variables, and we attempted to develop two independent models, on the basis of melt and apatite composition. In melt composition-based model, it was found that the D0 parameter increases with increasing melt polymerization as a proxy of which we have chosen the melt CaO. The D0 parameter is thus best expressed as a power law function of melt CaO. Through extensive search of the parameter space, the E and r0 variables were found to correlate strongly with linear combination of melt CaO, P2O5 and of reciprocal temperature, 1/T. Based on the apatite composition, we could not find any dependence of the partitioning parameters on compositional variables that would outperform solely a reciprocal temperature-based fit. The new parameterization was applied to predict REE and Y partition coefficients in lunar basalts and suggests that lunar apatite could only equilibrate with evolved melt at late stages of fractional crystallization.

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Lattice strain model for rare earth element partitioning between apatite and silicate melt: effect of apatite/melt composition and temperature with implications for lunar basalts

Jirků,

Špillar,

Fabbrizio

2024

Miner Petrol

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We present new parameterized lattice strain models to predict the apatite/silicate melt partition coefficients of the rare earth elements (REE) in natural magmatic systems as a function of temperature and melt composition with high accuracy and precision. We collected published experimental REE partition coefficients for apatite coexisting with melt ranging from picrobasaltic to rhyolitic and phonolitic composition. Resulting dataset was analysed using the lattice strain model to assess the data quality. The three lattice strain parameters (D0, r0, and E) were subjected to a multivariate nonlinear least-squares analysis as a function of intensive variables, and we attempted to develop two independent models, on the basis of melt and apatite composition. In melt composition-based model, it was found that the D0 parameter increases with increasing melt polymerization, which can be expressed by the newly proposed simplified melt polymerization index P.I. = ($$\:{X}_{{\text{S}\text{i}\text{O}}_{2}}$$+2$$\:{X}_{{\text{A}\text{l}}_{2}{\text{O}}_{3}}$$+$$\:{X}_{{\text{T}\text{i}\text{O}}_{2}}$$+2$$\:{X}_{{\text{P}}_{2}{\text{O}}_{5}}$$)/($$\:{X}_{\text{M}\text{g}\text{O}}$$+$$\:{X}_{\text{F}\text{e}\text{O}}$$+$$\:{X}_{\text{C}\text{a}\text{O}}$$+2$$\:{X}_{\text{a}\text{l}\text{k}}$$), where individual $$\:{X}_{i}$$ variables represent the molar fractions of the oxides in the melt. By disentangling the effect of each component of the P.I., it was found that the CaO content of the melt is the oxide that affects more the D0 parameter. Thus, the D0 parameter is expressed as a power law function of melt CaO content. Through extensive search of the parameter space, the E and r0 variables were found to correlate strongly with linear combination of melt CaO, P2O5 and of reciprocal temperature, 1/T. Based on the apatite composition, we could not find any dependence of the partitioning parameters on compositional variables that would outperform solely a reciprocal temperature-based fit. The new parameterization was applied to predict REE partition coefficients in lunar basalts and suggests that lunar apatite could only equilibrate with evolved melt at late stages of fractional crystallisation.

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Fe and Mg Isotope Compositions Indicate a Hybrid Mantle Source for Young Chang’E 5 Mare Basalts

Cited by 24 publications

References 71 publications

Petrogenesis of Chang'E‐5 young mare low‐Ti basalts

Petrogenesis of Chang'E‐5 young mare low‐Ti basalts

Parameterized model for trace-element partitioning between apatite and silicate melt: effect of apatite/melt composition and temperature with implications for lunar basalts

Lattice strain model for rare earth element partitioning between apatite and silicate melt: effect of apatite/melt composition and temperature with implications for lunar basalts

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