Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool  

作　　者：Honglei Lin Zhiping He Wei Yang Yangting Lin Rui Xu Chi Zhang Meng-Hua Zhu Rui Chang Jinhai Zhang Chunlai Li Hongyu Lin Yang Liu Sheng Gou Yong Wei Sen Hu Changbin Xue Jianfeng Yang Jie Zhong Xiaohui Fu Weixing Wan Yongliao Zou 

机构地区：[1]Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China [3]State Key Laboratory of Lunar and Planetary Sciences,Macao University of Science and Technology,Macao,China [4]Beijing Institute of Space Mechanics and Electricity,Beijing 100076,China [5]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [6]State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100101,China [7]Key Laboratory of Electronics and Information Technology for Space System,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [8]Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China [9]Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China [10]Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,Institute of Space Sciences,Shandong University,Weihai 264209,China

出　　处：《National Science Review》2020年第5期913-920,共8页国家科学评论（英文版）

基　　金：This work was supported by the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(QYZDJSSW-DQC001);the National Natural Science Foundation of China(41902318,41490631,41525016,11941001);the Beijing Municipal Science and Technology Commission(Z181100002918003).

摘　　要：Chang’E-4 landed in the South Pole-Aitken(SPA)basin,providing a unique chance to probe the composition of the lunar interior.Its landing site is located on ejecta strips in Von Karm´an crater that´possibly originate from the neighboring Finsen crater.A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations.In situ spectra of the regolith have peak band positions at 1 and 2μm,similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper,which confirms that the regolith’s composition of the landing area is mostly similar to that of Finsen ejecta.The rock spectrum shows similar band peak positions,but stronger absorptions,suggesting relatively fresh exposure.The rock may consist of 38.1±5.4%low-Ca pyroxene,13.9±5.1%olivine and 48.0±3.1%plagioclase,referred to as olivine-norite.The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle,but representative of the lunar lower crust.Alternatively,the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials.This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool,indicated by the fine to medium-sized texture(<3 mm)of the rock and the SPA-impact melting model[Icarus 2012;220:730–43].

关 键 词：impact basin lunar interior composition visible and near-infrared spectra lunar rover Yutu-2 Chang’E-4 mission 

分 类 号：P184[天文地球—天文学] V476.3[航空宇航科学与技术—飞行器设计]