High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith

Yang Jing; Du Wei

doi:10.1063/5.0148784

Volume 9 Issue 2

Mar. 2024

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Yang Jing, Du Wei. High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith[J]. Matter and Radiation at Extremes, 2024, 9(2): 027401. doi: 10.1063/5.0148784

Citation:

Yang Jing, Du Wei. High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith[J]. Matter and Radiation at Extremes, 2024, 9(2): 027401. doi: 10.1063/5.0148784

Yang Jing, Du Wei. High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith[J]. Matter and Radiation at Extremes, 2024, 9(2): 027401. doi: 10.1063/5.0148784

Citation:

Yang Jing, Du Wei. High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith[J]. Matter and Radiation at Extremes, 2024, 9(2): 027401. doi: 10.1063/5.0148784

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High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith

doi: 10.1063/5.0148784

Yang Jing^1
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Du Wei^{2, 3
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1.
Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
3.
CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

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Corresponding author: a)Author to whom correspondence should be addressed: duwei@mail.gyig.ac.cn
Received Date: 2023-03-02
Accepted Date: 2023-11-09

Available Online: 2024-03-01

Publish Date: 2024-03-01

Abstract

Abstract

Forty-five years after the Apollo and Luna missions, China’s Chang’e-5 (CE-5) mission collected ∼1.73 kg of new lunar materials from one of the youngest basalt units on the Moon. The CE-5 lunar samples provide opportunities to address some key scientific questions related to the Moon, including the discovery of high-pressure silica polymorphs (seifertite and stishovite) and a new lunar mineral, changesite-(Y). Seifertite was found to be coexist with stishovite in a silica fragment from CE-5 lunar regolith. This is the first confirmed seifertite in returned lunar samples. Seifertite has two space group symmetries (Pnc2 and Pbcn) and formed from an α-cristobalite-like phase during “cold” compression during a shock event. The aftershock heating process changes some seifertite to stishovite. Thus, this silica fragment records different stages of an impact process, and the peak shock pressure is estimated to be ∼11 to 40 GPa, which is much lower than the pressure condition for coexistence of seifertite and stishovite on the phase diagram. Changesite-(Y), with ideal formula (Ca₈Y)□Fe²⁺(PO₄)₇ (where □ denotes a vacancy) is the first new lunar mineral to be discovered in CE-5 regolith samples. This newly identified phosphate mineral is in the form of columnar crystals and was found in CE-5 basalt fragments. It contains high concentrations of Y and rare earth elements (REE), reaching up to ∼14 wt. % (Y,REE)₂O₃. The occurrence of changesite-(Y) marks the late-stage fractional crystallization processes of CE-5 basalts combined with silicate liquid immiscibility. These new findings demonstrate the significance of studies on high-pressure minerals in lunar materials and the special nature of lunar magmatic evolution.

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