Thorium anomaly on the lunar surface and its indicative meaning  

作　　者：Jingyi Zhang Jianzhong Liu 

机构地区：[1]Center for Lunar and Planetary Science,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Acta Geochimica》2024年第3期507-519,共13页地球化学学报（英文）

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).

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.

关 键 词：Procellarum KREEP Terrane(PKT) Feldspathic Highland Terrane(FHT) South Pole-Aitken Terrane(SPAT) KREEP Thorium abundance 

分 类 号：P184.5[天文地球—天文学]