Geologically Old but Freshly Exposed Rock Fragments Encountered by Yutu‐2 Rover,Journal of Geophysical Research: Planets

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Geologically Old but Freshly Exposed Rock Fragments Encountered by Yutu‐2 Rover
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-02-22 , DOI: 10.1029/2020je006565
Sheng Gou _{1,

2,

3} , Zongyu Yue _{1,

4} , Kaichang Di _{1,

4} , Roberto Bugiolacchi _{2,

3,

5} , Wenhui Wan ₁ , Meiping Yang _{1,

6} , Lejia Ye _{1,

6}

Affiliation

During the exploration traverse of the Von Kármán crater on the lunar farside, the Yutu‐2 rover, part of China's Chang'e‐4 mission, come across rock fragments with higher albedo than the surrounding surface. This study investigates their origin, emplacement, and composition based on in situ spectral analysis and geological considerations. The spectral signatures of two fragments show a clear dominance of low‐calcium pyroxenes against the high‐calcium phases characteristic of the basalts infilling the Von Kármán crater. Based on spectral considerations, this suggests an allochthonous origin for the ejecta fragments, with the most likely source attributable to the Imbrian 73‐km Finsen crater. We propose that these rock fragments might have had a convoluted history, born as ejected target materials from the Imbrian Finsen impact, possibly buried and resurfaced several times within Von Kármán by the churning mechanisms that continuously reshape the lunar surface, and finally exhumed by a secondary impact from the Copernican 3.8‐km Zhinyu crater.

更新日期：2021-03-10

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