DOI: 10.1016/j.epsl.2020.116702
论文题名: Young lunar mare basalts in the Chang'e-5 sample return region, northern Oceanus Procellarum
作者: Qian Y. ; Xiao L. ; Head J.W. ; van der Bogert C.H. ; Hiesinger H. ; Wilson L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 555 语种: 英语
中文关键词: Chang'e-5
; chronology
; lunar landing site
; Moon
; young mare basalts
英文关键词: Fluxes
; Geochronology
; Iron oxides
; Lunar missions
; Oxide minerals
; Titanium dioxide
; Global settings
; Lateral mixing
; Lava flow emplacements
; Lunar samples
; Sample analysis
; Sample return
; System impact
; Thermal evolution
; Basalt
; basalt
; lava flow
; lunar crust
; lunar mantle
; Moon
; regolith
; satellite data
; satellite imagery
; China
; Harpalus
; Parnassius apollo
英文摘要: Chang'e-5, China's first lunar sample return mission, is targeted to land in northern Oceanus Procellarum, within a region selected on the basis of 1) its location away from the Apollo-Luna sampling region, 2) the presence of the Procellarum KREEP Terrane (PKT), 3) the occurrence of one of the youngest lunar mare basalts (Em4), and 4) its association with Rima Sharp. In order to provide context for returned sample analyses, we conducted a comprehensive study of the regional and global settings, geomorphology, composition, mineralogy, and chronology of the Em4 mare basalts. Superposed on Imbrian-aged low-Ti basalts, Em4 covers 37,000 km2 and is composed of Eratosthenian-aged (∼1.53 Ga), high-Ti basalts with a mean thickness of ∼51 m and a volume between ∼1450 and 2350 km3. Minor variations in TiO2 and FeO abundance occur within the unit and the thorium content averages ∼6.7 ppm, typical of PKT mare basaltic regolith. No specific source vents (e.g., fissures, cones, domes) were found within the unit. We show that Rima Sharp is actually composed of three major rilles, whose source vents are located outside of, and which flow into, and merge in Em4, suggesting that they may be among the sources for Em4. Regolith thickness averages ∼7 m and there is abundant evidence for vertical and lateral mixing; the most likely sources of distal ejecta are Aristarchus, Harpalus, and Sharp B craters. Returned samples from local and distant materials delivered by impact will thus provide significant new insights into lunar geochronology, inner Solar System impact fluxes, the age of very young mare basalts, the role of the PKT in the generation of mare basalts, the role of sinuous rilles in lava flow emplacement, and the thermal evolution of the Moon. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165636
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Departmental of Earth, Environmental, and Planetary Sciences, Brown University, Providence, 02912, United States; Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei, 230026, China; Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Münster, 48149, Germany; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom
Recommended Citation:
Qian Y.,Xiao L.,Head J.W.,et al. Young lunar mare basalts in the Chang'e-5 sample return region, northern Oceanus Procellarum[J]. Earth and Planetary Science Letters,2021-01-01,555