2022年4月8日 · The nearside’s most extensive maria and highest Th concentrations encompass the SPA basin antipode and extend toward the southwest, marking the Procellarum KREEP Terrane (PKT) (2), a province that hosts a unique geochemical component with elevated levels of potassium (K), rare earth elements (REE), phosphorous (P), and other trace and heat-produ...

2024年2月27日 · 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. Many models of early lunar evolution have predicted that there exists an outermost molten layer consisting of a thick magma ocean around the Moon.

2023年6月6日 · Dating from the lunar magma ocean solidification period, the Procellarum KREEP Terrane (PKT) occupies 16% of the surface but has a much higher thorium abundance compared to the rest of the Moon and is thus interpreted to carry 40% of the radioactive elements by volume in the form of an anomalously thick KREEP-rich layer.

2021年10月3日 · Lunar Procellarum KREEP Terrane (PKT): Origin by Sequential Impact Processes Lunar evolution models predict that fractional crystallization of a lunar magma ocean (MO) produces a melt layer enriched in incompatible elements (KREEP) and that that the global surficial distribution of Th is a proxy for the distribution of KREEP.

In this analysis, we use impact craters and basins su-perposed on the ancient lunar crust to document the 3-D (lateral and vertical) extent of Th in PKT and SPA in order to establish the geometry and potential evolution of the KREEP layer.

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2009年8月24日 · Abstract: According to the composition distributon on the lunar surface, lunar crust can be divided into three main chemical terranes: 1) Procellarum KREEP Terrane (PKT); 2) Feldspathic Highland Terrane (FHT); 3) South Pole Aitken Terrane (SPAT). Through research the frontier and focus of cosmochemistry and solid earth science, we found lunar ...

PKT and SPAT: There exists a higher Th abundance in PKT than its surrounding areas, which has been inter-preted as KREEP materials being mainly concentrated in the subsurface of the PKT [2,6,16,17], perhaps through-out the crust. In the PKT, combining these high-Th cra-ters and their excavation depths (Table 1), we found that

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2024年4月14日 · 本研究通过对月表th异常分布研究发现，这些异常区域几乎都与撞击构造的分布密切相关，因此基于这些th异常的撞击挖掘深度，我们得出了pkt和spa的深部层序结构特征，并对其进行了对比研究，认为这两个地体具有一定的相似性，为探讨pkt的成因提供了一定的 ...