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dc.contributor.authorMitchell, Ross
dc.contributor.authorKirscher, Uwe
dc.contributor.authorKunzmann, M.
dc.contributor.authorLiu, Yebo
dc.contributor.authorCox, Grant
dc.date.accessioned2023-02-14T05:10:50Z
dc.date.available2023-02-14T05:10:50Z
dc.date.issued2021
dc.identifier.citationMitchell, R.N. and Kirscher, U. and Kunzmann, M. and Liu, Y. and Cox, G.M. 2021. Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event. Geology. 49 (1): pp. 25-29.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90463
dc.identifier.doi10.1130/G47587.1
dc.description.abstract

The ca. 1.4 Ga Velkerri and Xiamaling Formations, in Australia and the north China craton, respectively, are both carbonaceous shale deposits that record a prominent euxinic interval and were intruded by ca. 1.3 Ga dolerite sills. These similarities raise the possibility that these two units correlate, which would suggest the occurrence of widespread euxinia, organic carbon burial, and source rock deposition. Paleomagnetic data are consistent with Australia and the north China craton being neighbors in the supercontinent Nuna and thus permit deposition in a single large basin, and the putative stratigraphic correlation. However, lack of geochronological data has precluded definitive testing. The Xiamaling Formation has been shown to exhibit depositional control by orbital cycles. Here, we tested the putative correlation with the Velkerri Formation by cyclostratigraphic analysis. The Velkerri Formation exhibits sedimentological cycles that can be interpreted to represent the entire hierarchy of orbital cycles, according to a sedimentation rate that is consistent with Re-Os ages. Comparison of the inferred durations of the euxinic intervals preserved in both the Xiamaling and Velkerri Formations reveals a nearly identical ∼10-m.y.-long oceanic euxinic event. This permits the interpretation that the two hydrocarbon-rich units were deposited and matured in the same basin of Nuna, similar to the Gulf of Mexico during the breakup of Pangea.

dc.languageEnglish
dc.publisherGEOLOGICAL SOC AMER, INC
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FL150100133
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeology
dc.subjectNORTH CHINA CRATON
dc.subjectXIAMALING FORMATION
dc.subjectSUPERCONTINENT
dc.subjectCONSTRAINTS
dc.subjectDURATION
dc.subjectHISTORY
dc.subjectBREAKUP
dc.subjectOXYGEN
dc.subjectREDOX
dc.subjectBASIN
dc.titleGulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event
dc.typeJournal Article
dcterms.source.volume49
dcterms.source.number1
dcterms.source.startPage25
dcterms.source.endPage29
dcterms.source.issn0091-7613
dcterms.source.titleGeology
dc.date.updated2023-02-14T05:10:50Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidKirscher, Uwe [0000-0003-4203-1430]
dcterms.source.eissn1943-2682
curtin.contributor.scopusauthoridKirscher, Uwe [54787850500]


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