Thorium anomaly on the lunar surface and its indicative meaning

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Acta Geochimica Pub Date : 2024-02-27 DOI:10.1007/s11631-023-00670-2
Jingyi Zhang, Jianzhong Liu
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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.

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月球表面的钍异常及其指示意义
月球被划分为三个陆相:利用全球测量到的 Th 和 FeO,将月球划分为三个陆相:Procellarum KREEP 陆相(PKT)、长石质高地陆相(FHT)和南极-艾特肯陆相(SPAT)。许多月球演化模型预测,在结晶晚期,月球岩浆海洋会产生富含不相容元素(如 K、REE 和 P)的残留层(即 KREEP);钍的分布可作为确定 KREEP 全球分布的替代物。这三块陆相中钍的分布是不均匀的。PKT 的钍浓度最高,SPAT 的钍浓度中等,而 FHT 的钍浓度几乎为零。那么,每块岩性的具体分布情况如何,又能给我们带来哪些启示呢?在此,我们将介绍和描述钍在 PKT、SPAT 和 FHT 中的详细分布情况,并为月球表面不对称现象的起源提供一些信息。
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来源期刊
Acta Geochimica
Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
2.80
自引率
6.20%
发文量
1134
期刊介绍: Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.
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