China's Chang'e-5 landing site: Geology, stratigraphy, and provenance of materials
نویسندگان
چکیده
China's Chang'e-5 (CE-5) mission, the first lunar sample return mission since 1976, landed at 43.06°N, 51.92°W on Dec. 1, 2020, in Northern Oceanus Procellarum. CE-5 targeted a mare plain (Em4/P58) composed of distinctive young (∼1.6-1.7 Ga) moderate-Ti basalts, with elevated Th abundance (inherent or extraneous). Thus, regolith and rock fragments sampled by come from some youngest basalts Moon, near Rima Sharp, center globally anomalous Procellarum KREEP Terrane (PKT), hypothesized to be responsible for generation volcanism. To provide context analysis interpretation returned samples in-situ measurements substructure penetrating radar, we constructed detailed geologic map stratigraphic assessment site. The stratigraphy consists ancient highland materials (PKT crust ejecta Iridum Imbrium basins), local silica-rich volcanism, overlain sequence capped Em4/P58. A ∼4-7 m thick layer developed post-mare bombardment overlies Em4/P58 protolith contains admixed impact distant sources, mainly Harpalus (∼6 wt.%), followed Copernicus (∼2 wt.%) Aristarchus (∼1 wt.%). New crater size-frequency necessary spatial density reference calibration cratering chronology radiometric ages samples. geological provenance indicate that will address fundamental questions chronology, thermal evolution, basalt petrogenesis, nature PKT, as well key planetary chronologies remote sensing data.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2021
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2021.116855