中国科学院地球化学研究所刘建忠团队近日在研究月球表面钍异常及其指示意义中取得新进展。这一研究成果发表在2024年2月27日出版的国际学术期刊《地球化学学报》上。

据悉，使用用全球测量的Th和FeO数据，月球被分为三个地系：风暴洋克里普地体(PKT)、长石高地地体(FHT)和南极—艾肯盆地(SPAT)。

研究人员称，许多月球演化模型预测，月球岩浆海在结晶后期将产生富含K、REE、P等不相容元素的残余层(即KREEP)；并且钍的分布可以作为确定KREEP全球分布的代理标志。钍在这三个地体中的分布是不均匀的。在PKT中钍的浓度最高，在SPAT中钍的浓度中等，在FHT中几乎没有。

那么在钍各个地体的具体分布是怎样的，又能给研究人员带来什么启示呢？基于此问题，研究人员提出并描述了详细的钍在PKT、SPAT和FHT中的分布，并为月球表面不对称的起源提供了一些信息。

附：英文原文

Title: Thorium anomaly on the lunar surface and its indicative meaning

Author: Zhang, Jingyi, Liu, Jianzhong

Issue&Volume: 2024-02-27

Abstract: 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 evolution 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 crystallization; 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 inhomogeneous. 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.

DOI: 10.1007/s11631-023-00670-2

Source: https://link.springer.com/article/10.1007/s11631-023-00670-2