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dc.contributor.authorGarrick-Bethell, I.
dc.contributor.authorMiljkovic, Katarina
dc.contributor.authorHiesinger, H.
dc.contributor.authorvan der Bogert, C.H.
dc.contributor.authorLaneuville, M.
dc.contributor.authorShuster, D.L.
dc.contributor.authorKorycansky, D.G.
dc.date.accessioned2023-01-28T02:15:07Z
dc.date.available2023-01-28T02:15:07Z
dc.date.issued2020
dc.identifier.citationGarrick-Bethell, I. and Miljkovic, K. and Hiesinger, H. and van der Bogert, C.H. and Laneuville, M. and Shuster, D.L. and Korycansky, D.G. 2020. Troctolite 76535: A sample of the Moon's South Pole-Aitken basin? Icarus. 338: ARTN 113430.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90200
dc.identifier.doi10.1016/j.icarus.2019.113430
dc.description.abstract

© 2019 Elsevier Inc. Lunar samples returned by the Apollo program have provided insights into numerous solar system processes. However, no samples were returned from the lunar farside, where one of the Moon's most geologically important features resides: the 2500-km-diameter South Pole-Aitken basin (SPA). Here, we explore the hypothesis that lunar troctolite 76535 was excavated by SPA. This hypothesis is motivated by the sample's low peak shock pressure (<6 GPa), its substantial depth of origin (45–65 km), and its ancient 40Ar/39Ar age of 4.25 Ga. We use hydrodynamic simulations of crater formation to show that for vertically incident impactors, SPA is the only known basin that can excavate material from the depth and shock pressure range relevant to 76535. The thermal history of 76535 also rules out excavation where a magma ocean was locally present. However, for the vertical impacts modeled, delivery of 76535 to the Apollo 17 site, where it was collected, requires a second impact event that preserved the sample's low shock state. An alternative interpretation of the SPA origin is that 76535 originates from the Serenitatis, Fecunditatis, or Australe basins, if the inferred origin depth of 76535 is in error by ~20 km, or its inferred peak shock pressure is in error by a factor of ~2. These basins could also be candidates for excavating 76535, if oblique impacts yield lower shock pressures of material excavated from the relevant depth. If troctolite 76535 is in fact a sample of SPA, we find that its 4.25 Ga excavation age and the density of large (100–300 km diameter) impact basins within and on the rim of SPA are consistent with the monotonically decaying Neukum (1983) chronology.

dc.languageEnglish
dc.publisherACADEMIC PRESS INC ELSEVIER SCIENCE
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectAstronomy & Astrophysics
dc.subjectINNER SOLAR-SYSTEM
dc.subjectLUNAR CATACLYSM
dc.subjectMG-SUITE
dc.subjectSHOCK COMPRESSION
dc.subjectMANTLE XENOLITHS
dc.subjectOBLIQUE IMPACTS
dc.subjectORIGIN
dc.subjectBOMBARDMENT
dc.subjectHISTORY
dc.subjectCHRONOLOGY
dc.titleTroctolite 76535: A sample of the Moon's South Pole-Aitken basin?
dc.typeJournal Article
dcterms.source.volume338
dcterms.source.issn0019-1035
dcterms.source.titleIcarus
dc.date.updated2023-01-28T02:15:06Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidMiljkovic, Katarina [0000-0001-8644-8903]
curtin.contributor.researcheridMiljkovic, Katarina [D-4844-2013]
curtin.identifier.article-numberARTN 113430
dcterms.source.eissn1090-2643
curtin.contributor.scopusauthoridMiljkovic, Katarina [35219281700]


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