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dc.contributor.authorCosta, M.M.
dc.contributor.authorJensen, N.K.
dc.contributor.authorBouvier, L.C.
dc.contributor.authorConnelly, J.N.
dc.contributor.authorMikouchi, T.
dc.contributor.authorHorstwood, M.S.A.
dc.contributor.authorSuuronen, J.P.
dc.contributor.authorMoynier, F.
dc.contributor.authorDeng, Z.
dc.contributor.authorAgranier, A.
dc.contributor.authorMartin, L.A.J.
dc.contributor.authorJohnson, Tim
dc.contributor.authorNemchin, Alexander
dc.contributor.authorBizzarro, M.
dc.date.accessioned2023-03-14T08:06:06Z
dc.date.available2023-03-14T08:06:06Z
dc.date.issued2020
dc.identifier.citationCosta, M.M. and Jensen, N.K. and Bouvier, L.C. and Connelly, J.N. and Mikouchi, T. and Horstwood, M.S.A. and Suuronen, J.P. et al. 2020. The internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record. Proceedings of the National Academy of Sciences of the United States of America. 117 (49): pp. 30973-30979.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90944
dc.identifier.doi10.1073/pnas.2016326117
dc.description.abstract

Combining U-Pb ages with Lu-Hf data in zircon provides insights into the magmatic history of rocky planets. The Northwest Africa (NWA) 7034/7533 meteorites are samples of the southern highlands of Mars containing zircon with ages as old as 4476.3 ± 0.9 Ma, interpreted to reflect reworking of the primordial Martian crust by impacts. We extracted a statistically significant zircon population (n = 57) from NWA 7533 that defines a temporal record spanning 4.2 Gyr. Ancient zircons record ages from 4485.5 ± 2.2 Ma to 4331.0 ± 1.4 Ma, defining a bimodal distribution with groupings at 4474 ± 10 Ma and 4442 ± 17 Ma. We interpret these to represent intense bombardment episodes at the planet's surface, possibly triggered by the early migration of gas giant planets. The unradiogenic initial Hf-isotope composition of these zircons establishes that Mars's igneous activity prior to ∼4.3 Ga was limited to impact-related reworking of a chemically enriched, primordial crust. A group of younger detrital zircons record ages from 1548.0 ± 8.8 Ma to 299.5 ± 0.6 Ma. The only plausible sources for these grains are the temporally associated Elysium and Tharsis volcanic provinces that are the expressions of deep-seated mantle plumes. The chondritic-like Hf-isotope compositions of these zircons require the existence of a primitive and convecting mantle reservoir, indicating that Mars has been in a stagnant-lid tectonic regime for most of its history. Our results imply that zircon is ubiquitous on the Martian surface, providing a faithful record of the planet's magmatic history.

dc.languageEnglish
dc.publisherNATL ACAD SCIENCES
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP190103849
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectScience & Technology
dc.subjectMultidisciplinary Sciences
dc.subjectScience & Technology - Other Topics
dc.subjectMars
dc.subjectmeteorites
dc.subjectzircon
dc.subjectgeodynamics
dc.subjectMARTIAN MANTLE
dc.subjectMAGMA OCEAN
dc.subjectHISTORY
dc.subjectORIGIN
dc.subjectCRUST
dc.subjectSYSTEMATICS
dc.subjectCONVECTION
dc.subjectMINERALOGY
dc.subjectAGE
dc.subjectMars
dc.subjectgeodynamics
dc.subjectmeteorites
dc.subjectzircon
dc.titleThe internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record
dc.typeJournal Article
dcterms.source.volume117
dcterms.source.number49
dcterms.source.startPage30973
dcterms.source.endPage30979
dcterms.source.issn0027-8424
dcterms.source.titleProceedings of the National Academy of Sciences of the United States of America
dc.date.updated2023-03-14T08:06:06Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidNemchin, Alexander [0000-0002-3955-3409]
curtin.contributor.orcidJohnson, Tim [0000-0001-8704-4396]
curtin.contributor.researcheridJohnson, Tim [C-4330-2013]
dcterms.source.eissn1091-6490
curtin.contributor.scopusauthoridNemchin, Alexander [6701731963]
curtin.contributor.scopusauthoridJohnson, Tim [7404019116]
curtin.repositoryagreementV3


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