Radiative Transfer Modeling of Chang’e-4 Spectroscopic Observations and Interpretation of the South Pole-Aitken Compositional Anomaly

Chen, Jian; Ling, Zongcheng; Jolliff, Bradley L.; Sun, Lingzhi; Qiao, Le; Liu, Jianzhong; Fu, Xiaohui; Zhang, J.; Li, Bo; Liu, Changqing; Qi, Xiaobin; Lu, X.; He, Zhiping; Xu, Rui

doi:10.3847/2041-8213/ac6e6c

Cited by 10 publications

(4 citation statements)

References 47 publications

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“…In addition, VNIS is not sensitive to Fsp, and the visible and near‐infrared spectral peaks of silicate minerals partially overlap. Quantitative mineralogical using VNIS data sometimes lead to inconsistent results (Chen et al., 2022; Gou et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

Quantitative Mineralogy of Planetary Silicate Ternary Mixtures Using Raman Spectroscopy

Ling

Liu

et al. 2023

Earth and Space Science

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A 532‐nm‐excited lunar Raman spectrometer (LRS) has been selected as a scientific payload of the Chang'e‐7 mission, exploring mineralogy assemblages in the lunar south polar region. However, the quantification of dark‐colored silicate minerals via Raman spectroscopy is an urgent requirement for upcoming Raman applications in future lunar and planetary explorations. Therefore, we conducted detailed laboratory studies on the Raman quantification of lunar silicate minerals using ternary mixtures of feldspar, olivine, and augite. Quantitative models were established employing the observed linear relationship between Raman integrated intensities and mineral proportions. The significant correlation coefficients (>0.94) and small RMSE (≤4.20 wt.%) confirmed the performance of these models. A series of methods (multipoint sampling, multispectral averaging, peak area extraction, and spectral parameter ratios) were jointly used to ensure that the models were not significantly affected by crystal orientation, chemical inhomogeneity, and instruments. Factors (σ2/σ1) describing the relative Raman scattering cross sections were introduced to calibrate the Raman counts. Our results indicated that the relative Raman scattering efficiency of feldspar, olivine, and augite is 1.4:2.4:1, which can be used to improve the quantitative accuracy of the point‐counting method if polymineralic mixing spectra are dominant. The models were validated across different samples using laboratory mixtures and lunar soil (CE5C0600). The lithology of the Chang'e‐5 soils is basaltic/gabbroic according to the quantitative mineralogy returned from our models that is consistent with the results from traditional methods. This research will be of particular significance for accurately determining the mineral abundances for Chang'e‐7 and other planetary missions. As such, crucial information can be inferred to understand the geological evolution of the exploration regions.

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Section: Discussionmentioning

confidence: 99%

Quantitative Mineralogy of Planetary Silicate Ternary Mixtures Using Raman Spectroscopy

Ling

Liu

et al. 2023

Earth and Space Science

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“…Among its various characteristics, the Lunar South Polar Region's Microelement anomaly associated with the interior of the Lunar South Polar Region has attracted wide attention from the lunar scientific community . [7] Therefore, a series of related problems such as water and microelement in the moon and the existence of water (ice) in the permanent shadow region have always been the focus of international academic research and the focus of future engineering tasks. There are a large number of impact craters in the South Pole of the moon, many of which belong to permanent shadow region, which is an important place to reveal the above scientific problems and evaluate future resources.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

Microelement exploration in lunar south polar region

Wang,

Jiao,

Wei

et al. 2024

International Conference on Remote Sensing Technology and Survey Mapping (RSTSM 2024)

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“…Then, some significant dark/shadow pixels need to be removed before calculating the average VNIR reflectance in the field of view of SWIR detectors. Here, we regard the pixels with REFFs at 465 nm less than 0.02 as shadows 83 . The average VNIR reflectance is adjusted to SWIR with the overlapping points using linear regression fitting to acquire a continuous spectrum (Supplementary Fig.…”

Section: Rover Locomotion Simulationmentioning

confidence: 99%

Lunar rock investigation and tri-aspect characterization of lunar farside regolith by a digital twin

Ding,

Zhou,

et al. 2024

Nat Commun

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Yutu-2 rover conducted an exciting expedition on the 41st lunar day to investigate a fin-shaped rock at Longji site (45.44°S, 177.56°E) by extending its locomotion margin on perilous peaks. The varied locomotion encountered, especially multi-form wheel slippage, during the journey to the target rock, established unique conditions for a fin-grained lunar regolith analysis regarding bearing, shear and lateral properties based on terramechanics. Here, we show a tri-aspect characterization of lunar regolith and infer the rock’s origin using a digital twin. We estimate internal friction angle within 21.5°−42.0° and associated cohesion of 520-3154 Pa in the Chang’E-4 operational site. These findings suggest shear characteristics similar to Apollo 12 mission samples but notably higher cohesion compared to regolith investigated on most nearside lunar missions. We estimate external friction angle in lateral properties to be within 8.3°−16.5°, which fills the gaps of the lateral property estimation of the lunar farside regolith and serves as a foundational parameter for subsequent engineering verifications. Our in-situ spectral investigations of the target rock unveil its composition of iron/magnesium-rich low-calcium pyroxene, linking it to the Zhinyu crater (45.34°S, 176.15°E) ejecta. Our results indicate that the combination of in-situ measurements with robotics technology in planetary exploration reveal the possibility of additional source regions contributing to the local materials at the Chang’E-4 site, implying a more complicated geological history in the vicinity.

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Radiative Transfer Modeling of Chang’e-4 Spectroscopic Observations and Interpretation of the South Pole-Aitken Compositional Anomaly

Cited by 10 publications

References 47 publications

Quantitative Mineralogy of Planetary Silicate Ternary Mixtures Using Raman Spectroscopy

Quantitative Mineralogy of Planetary Silicate Ternary Mixtures Using Raman Spectroscopy

Microelement exploration in lunar south polar region

Lunar rock investigation and tri-aspect characterization of lunar farside regolith by a digital twin

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