2015•Proceedings of the National Academy of SciencesOpen access
Volcanic history of the Imbrium basin: A close-up view from the lunar rover Yutu
Jinhai Zhang, Wei Yang, Sen Hu, Yangting Lin, Guangyou Fang, Chunlai Li, Wen-Xi Peng, Sanyuan Zhu, Zhiping He, Bin Zhou, Hongyu Lin, Jianfeng Yang, Enhai Liu, Yuchen Xu, Jianyu Wang, Zhenxing Yao, Yongliao Zou, Jun Yan, Ziyuan Ouyang
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Abstract
We report the surface exploration by the lunar rover Yutu that landed on the young lava flow in the northeastern part of the Mare Imbrium, which is the largest basin on the nearside of the Moon and is filled with several basalt units estimated to date from 3.5 to 2.0 Ga. The onboard lunar penetrating radar conducted a 114-m-long profile, which measured a thickness of ∼5 m of the lunar regolith layer and detected three underlying basalt units at depths of 195, 215, and 345 m. The radar measurements suggest underestimation of the global lunar regolith thickness by other methods and reveal a vast volume of the last volcano eruption. The in situ spectral reflectance and elemental analysis of the lunar soil at the landing site suggest that the young basalt could be derived from an ilmenite-rich mantle reservoir and then assimilated by 10-20% of the last residual melt of the lunar magma ocean.