Thorium anomaly on the lunar surface and its indicative meaning

作     者：Jingyi Zhang Jianzhong Liu Jingyi Zhang;Jianzhong Liu

作者机构：Center for Lunar and Planetary ScienceInstitute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2024年第43卷第3期

页      面：507-519页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：This work was supported by National Key Research and Development Program of China(Grant No.2022YFF0503100) the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB 41000000). 

主　　题：Procellarum KREEP Terrane(PKT) Feldspathic Highland Terrane(FHT) South Pole-Aitken Terrane(SPAT) KREEP Thorium abundance 

摘      要：The Moon has been divided into three terranes:Procellarum KREEP Terrane(PKT),Feldspathic Highland Terrane(FHT),and South Pole-Aitken Terrane(SPAT),using globally measured Th and FeO.Many lunar evolu-tion models have predicted that a lunar magma ocean will produce a residual layer enriched in incompatible elements such as K,REE,and P(i.e.,KREEP)in the late age of crys-tallization;and that the distribution of thorium can be used as a proxy for determining the global distribution of KREEP.The thorium distribution in these three terranes is inhomo-geneous.The highest concentration of thorium is in PKT,the medium concentration of thorium is in SPAT,and almost none in FHT.Then what is the specific distribution in each of the terrane and what enlightenment can it tell us?Here we present and describe the detailed thorium distribution in PKT,SPAT,and FHT and provide some information for the origin of asymmetries on the lunar surface.