Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event
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 correla...
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| Format: | Journal Article |
| Language: | English |
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GEOLOGICAL SOC AMER, INC
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/90463 |
| _version_ | 1848765380680482816 |
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| author | Mitchell, Ross Kirscher, Uwe Kunzmann, M. Liu, Yebo Cox, Grant |
| author_facet | Mitchell, Ross Kirscher, Uwe Kunzmann, M. Liu, Yebo Cox, Grant |
| author_sort | Mitchell, Ross |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T11:34:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-90463 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:34:20Z |
| publishDate | 2021 |
| publisher | GEOLOGICAL SOC AMER, INC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-904632023-03-16T07:24:45Z Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event Mitchell, Ross Kirscher, Uwe Kunzmann, M. Liu, Yebo Cox, Grant Science & Technology Physical Sciences Geology NORTH CHINA CRATON XIAMALING FORMATION SUPERCONTINENT CONSTRAINTS DURATION HISTORY BREAKUP OXYGEN REDOX BASIN 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. 2021 Journal Article http://hdl.handle.net/20.500.11937/90463 10.1130/G47587.1 English http://purl.org/au-research/grants/arc/FL150100133 http://creativecommons.org/licenses/by/4.0/ GEOLOGICAL SOC AMER, INC fulltext |
| spellingShingle | Science & Technology Physical Sciences Geology NORTH CHINA CRATON XIAMALING FORMATION SUPERCONTINENT CONSTRAINTS DURATION HISTORY BREAKUP OXYGEN REDOX BASIN Mitchell, Ross Kirscher, Uwe Kunzmann, M. Liu, Yebo Cox, Grant Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title | Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title_full | Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title_fullStr | Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title_full_unstemmed | Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title_short | Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event |
| title_sort | gulf of nuna: astrochronologic correlation of a mesoproterozoic oceanic euxinic event |
| topic | Science & Technology Physical Sciences Geology NORTH CHINA CRATON XIAMALING FORMATION SUPERCONTINENT CONSTRAINTS DURATION HISTORY BREAKUP OXYGEN REDOX BASIN |
| url | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/90463 |