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Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase

  • Heng-Ci Tian EMAIL logo , Wei Yang EMAIL logo , Di Zhang , Huijuan Zhang , Lihui Jia , Shitou Wu , Yangting Lin , Xianhua Li and Fuyuan Wu
Published/Copyright: August 31, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 9

Abstract

This study focuses on using the chemical compositions of plagioclase to further investigate the petrogenesis of Chang’E-5 young mare basalts and constrain its parental melt composition. Together with previously published data, our results show that the plagioclase in mare basalts overall displays large variations in major and trace element concentrations. Inversion of the plagioclase data indicates that the melt compositions parental to Chang’E-5 basalts have high rare earth elements (REE) concentrations similar to the high-K KREEP rocks (potassium, rare earth elements, and phosphorus). Such a signature is unlikely to result from the assimilation of KREEP components, because the estimated melt Sr shows positive correlations with other trace elements (e.g., Ba, La), which are far from the KREEP end-member. Instead, the nearly parallel REE distributions and a high degree of trace element enrichment in plagioclase indicate an extensive fractional crystallization process. Furthermore, the estimated melt REE concentrations from plagioclase are slightly higher than those from clinopyroxene, consistent with its relatively later crystallization. Using the Ti partition coefficient between plagioclase and melt, we estimated the parental melt TiO2 content from the earliest crystallized plagioclase to be ~3.3 ± 0.4 wt%, thus providing robust evidence for a low-Ti and non-KREEP origin for the Chang’E-5 young basalts in the Procellarum KREEP terrane.

Keywords: Plagioclase; clinopyroxene; basalt; low-Ti; rare earth element; KREEP

Acknowledgments and funding

We thank the China National Space Administration for providing the lunar soil samples. We thank AE Claire Bucholz and an anonymous reviewer for their constructive comments, which greatly improved the manuscript. We are also grateful to Jun Du for valuable suggestions. This work was supported by the Key Research program of Chinese Academy of Sciences (ZDBS-SSW-JSC007-15), the pre-research project on Civil Aerospace Technologies of China National Space Administration (D020203), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB 41000000), the key research program of the Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS-202101) and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (2022064).

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Received: 2022-04-28
Accepted: 2022-10-12
Published Online: 2023-08-31
Published in Print: 2023-09-26

© 2023 by Mineralogical Society of America

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  6. A multi-methodological study of the bastnäsite-synchysite polysomatic series: Tips and tricks of polysome identification and the origin of syntactic intergrowths
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https://doi.org/10.2138/am-2022-8570
Keywords for this article
Plagioclase; clinopyroxene; basalt; low-Ti; rare earth element; KREEP

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  1. Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits
  2. Apatite in brachinites: Insights into thermal history and halogen evolution
  3. A high-pressure structural transition of norsethite-type BaFe(CO3)2: Comparison with BaMg(CO3)2 and BaMn(CO3)2
  4. An evolutionary system of mineralogy, Part VII: The evolution of the igneous minerals (>2500 Ma)
  5. Oriented secondary magnetite micro-inclusions in plagioclase from oceanic gabbro
  6. A multi-methodological study of the bastnäsite-synchysite polysomatic series: Tips and tricks of polysome identification and the origin of syntactic intergrowths
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  10. Mechanism and kinetics of the pseudomorphic replacement of anhydrite by calcium phosphate phases at hydrothermal conditions
  11. Vacancy infilling during the crystallization of Fe-deficient hematite: An in situ synchrotron X-ray diffraction study of non-classical crystal growth
  12. Simulated diagenesis of the iron-silica precipitates in banded iron formations
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