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Subsequent research has focused on the processes responsible for PKT concentration and localization (e.g., degree-1 convection, farside impact basin effects, etc.), and the effect of PKT high-radioactivity localization on lunar thermal evolution (e.g., topography relaxation, mantle heating, late-stage mare basalt generation, etc.). Here we use a stratigraphic approach and new crustal thickness data to probe the nature of the PKT with depth. We find that most PKT characteristics can be explained by sequential impact cratering events that excavated and redistributed to the surface\/near-surface a much thinner Th-rich KREEP layer at depth, implying that no anomalous conditions of PKT thickness, radioactive abundances, geodynamics, thermal effects or magma generation are likely to be required as in the previous studies.<\/jats:p>","DOI":"10.3390\/rs15071861","type":"journal-article","created":{"date-parts":[[2023,3,31]],"date-time":"2023-03-31T01:37:02Z","timestamp":1680226622000},"page":"1861","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Lunar Procellarum KREEP Terrane (PKT) Stratigraphy and Structure with Depth: Evidence for Significantly Decreased Th Concentrations and Thermal Evolution Consequences"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3772-6254","authenticated-orcid":false,"given":"Jingyi","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for Lunar and Planetary Science, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China"},{"name":"University of Chinese Academy of Sciences, Beijing 100049, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Head","sequence":"additional","affiliation":[{"name":"Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianzhong","family":"Liu","sequence":"additional","affiliation":[{"name":"Center for Lunar and Planetary Science, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ross","family":"Potter","sequence":"additional","affiliation":[{"name":"Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA"},{"name":"Institute for Scientific Information, Clarivate, 70 St. Mary Axe, London EC3A 8BE, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/0040-1951(89)90151-0","article-title":"Growth of planetary crusts","volume":"161","author":"Taylor","year":"1989","journal-title":"Tectonophysics"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"501","DOI":"10.1016\/0012-821X(95)00138-3","article-title":"A model for the thermal and chemical evolution of the Moon's interior: Implications for the onset of mare volcanism","volume":"134","author":"Hess","year":"1995","journal-title":"Earth Planet. 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