Wulong: A New Main Group Pallasite

Q4 Physics and Astronomy
Liu Hang-cheng , Zhang Xin-ru , He Wen-zhong , Liao Shi-yong , Hsu Wei-biao , Jiang Yun
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引用次数: 0

Abstract

As the fragments of differentiated asteroids in the early solar system, pallasites record deep-mantle and core processes. As such, studying the origin of pallasites could help us understand the formation and differentiation processes governing the evolution of planets. Wulong pallasite was found in Inner Mongolia, China around 1992, but didn't get much attention until 2020. In this study, we reported the detailed petrography and mineralogy, oxygen isotopic composition, and metal phase chemistry of Wulong pallasite. Wulong pallasite is mainly composed of olivine ( 72.7 vol.%), Fe-Ni metal ( 26.2 vol.%), troilite ( 0.6 vol.%), schreibersite ( 0.4 vol.%), and chromite ( 0.1 vol.%) etc. Olivine (Fa12.5±0.2) and chromite (Al#15.2 ± 0.9, Fe# 67.9 ± 1.5) compositions are homogeneous, and no chemical zoning is observed. Siderophile element contents of a metal phase are Ni, 7.71 wt.%; Ga, 17.8 μg/g; and Ge, 26.2 μg/g. The mean δ18O value is 3.04 ± 0.01‰, Δ17O value is 0.18 ± 0.01‰. In terms of the Fa value of olivine, metal phase chemistry, and oxygen isotope ratios, Wulong could be a new member of main group pallasite.
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来源期刊
Chinese Astronomy and Astrophysics
Chinese Astronomy and Astrophysics Physics and Astronomy-Astronomy and Astrophysics
CiteScore
0.70
自引率
0.00%
发文量
20
期刊介绍: The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.
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