The Yutu-2 rover of the Chang'e-4 mission has been exploring the lunar farside since January 2019.By analyzing the visible and near-infrared spectra collected by Yutu-2 during its first five years of operation,we ...The Yutu-2 rover of the Chang'e-4 mission has been exploring the lunar farside since January 2019.By analyzing the visible and near-infrared spectra collected by Yutu-2 during its first five years of operation,we have identified that the pyroxene in the surrounding lunar regolith is primarily low-Ca clinopyroxene.Findings from spectral absorption analyses and mineralogical quantification indicate that the lunar regolith in the Chang'e-4 landing area predominantly consists of local mare basaltic materials rather than Finsen's ejecta.These mare basaltic substances were likely excavated by Finsen's secondary crater from the local basalt layer located at depths below about 8 m.Collaborative analyses of the mineralogy and topography along the Yutu-2 traverse suggest that the southern wall and western wall of Finsen's secondary crater may have experienced different degradation processes.Additionally,the Finsen's ejecta may be predominantly deposited at the center of its secondary crater.Our results reveal that the distal impact ejecta are capable of substantially excavating the local materials.These findings reveal the complex evolutionary processes of the lunar regolith and highlight the significance of meticulous analysis for the provenance of lunar surface materials.展开更多
基金supported by the National Key Research and Development Program of China(Grant Nos.2022YFF0711400&2022YFF0503100)the Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(Grant Nos.2021QNRC001&2022QNRC001)the National Natural Science Foundation of China(Grant Nos.12273044&62495034)。
文摘The Yutu-2 rover of the Chang'e-4 mission has been exploring the lunar farside since January 2019.By analyzing the visible and near-infrared spectra collected by Yutu-2 during its first five years of operation,we have identified that the pyroxene in the surrounding lunar regolith is primarily low-Ca clinopyroxene.Findings from spectral absorption analyses and mineralogical quantification indicate that the lunar regolith in the Chang'e-4 landing area predominantly consists of local mare basaltic materials rather than Finsen's ejecta.These mare basaltic substances were likely excavated by Finsen's secondary crater from the local basalt layer located at depths below about 8 m.Collaborative analyses of the mineralogy and topography along the Yutu-2 traverse suggest that the southern wall and western wall of Finsen's secondary crater may have experienced different degradation processes.Additionally,the Finsen's ejecta may be predominantly deposited at the center of its secondary crater.Our results reveal that the distal impact ejecta are capable of substantially excavating the local materials.These findings reveal the complex evolutionary processes of the lunar regolith and highlight the significance of meticulous analysis for the provenance of lunar surface materials.
