Calibrating the coevolution of Ediacaran life and environment
The rise of animals occurred during an interval of Earth history that witnessed dynamic marine redox conditions, potentially rapid plate motions, and uniquely large perturbations to global biogeochemical cycles. The largest of these perturbations, the Shuram carbon isotope excursion, has been invoke...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Proceedings of the National Academy of Sciences
2021
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| Online Access: | https://hdl.handle.net/1721.1/131287 |
| _version_ | 1826193962348576768 |
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| author | Rooney, Alan D. Cantine, Marjorie Dianne Bergmann, Kristin Gómez-Pérez, Irene Al Baloushi, Badar Boag, Thomas H. Busch, James F. Sperling, Erik A. Strauss, Justin V. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Rooney, Alan D. Cantine, Marjorie Dianne Bergmann, Kristin Gómez-Pérez, Irene Al Baloushi, Badar Boag, Thomas H. Busch, James F. Sperling, Erik A. Strauss, Justin V. |
| author_sort | Rooney, Alan D. |
| collection | MIT |
| description | The rise of animals occurred during an interval of Earth history that witnessed dynamic marine redox conditions, potentially rapid plate motions, and uniquely large perturbations to global biogeochemical cycles. The largest of these perturbations, the Shuram carbon isotope excursion, has been invoked as a driving mechanism for Ediacaran environmental change, possibly linked with evolutionary innovation or extinction. However, there are a number of controversies surrounding the Shuram, including its timing, duration, and role in the concomitant biological and biogeochemical upheavals. Here we present radioisotopic dates bracketing the Shuram on two separate paleocontinents; our results are consistent with a global and synchronous event between 574.0 ± 4.7 and 567.3 ± 3.0 Ma. These dates support the interpretation that the Shuram is a primary and synchronous event postdating the Gaskiers glaciation. In addition, our Re-Os ages suggest that the appearance of Ediacaran macrofossils in northwestern Canada is identical, within uncertainty, to similar macrofossils from the Conception Group of Newfoundland, highlighting the coeval appearance of macroscopic metazoans across two paleocontinents. Our temporal framework for the terminal Proterozoic is a critical step for testing hypotheses related to extreme carbon isotope excursions and their role in the evolution of complex life. |
| first_indexed | 2024-09-23T09:48:02Z |
| format | Article |
| id | mit-1721.1/131287 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:48:02Z |
| publishDate | 2021 |
| publisher | Proceedings of the National Academy of Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1312872022-09-30T16:57:23Z Calibrating the coevolution of Ediacaran life and environment Rooney, Alan D. Cantine, Marjorie Dianne Bergmann, Kristin Gómez-Pérez, Irene Al Baloushi, Badar Boag, Thomas H. Busch, James F. Sperling, Erik A. Strauss, Justin V. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences The rise of animals occurred during an interval of Earth history that witnessed dynamic marine redox conditions, potentially rapid plate motions, and uniquely large perturbations to global biogeochemical cycles. The largest of these perturbations, the Shuram carbon isotope excursion, has been invoked as a driving mechanism for Ediacaran environmental change, possibly linked with evolutionary innovation or extinction. However, there are a number of controversies surrounding the Shuram, including its timing, duration, and role in the concomitant biological and biogeochemical upheavals. Here we present radioisotopic dates bracketing the Shuram on two separate paleocontinents; our results are consistent with a global and synchronous event between 574.0 ± 4.7 and 567.3 ± 3.0 Ma. These dates support the interpretation that the Shuram is a primary and synchronous event postdating the Gaskiers glaciation. In addition, our Re-Os ages suggest that the appearance of Ediacaran macrofossils in northwestern Canada is identical, within uncertainty, to similar macrofossils from the Conception Group of Newfoundland, highlighting the coeval appearance of macroscopic metazoans across two paleocontinents. Our temporal framework for the terminal Proterozoic is a critical step for testing hypotheses related to extreme carbon isotope excursions and their role in the evolution of complex life. 2021-09-17T14:00:11Z 2021-09-17T14:00:11Z 2020-07 2020-02 2021-09-13T18:32:20Z Article http://purl.org/eprint/type/JournalArticle 0027-8424 1091-6490 https://hdl.handle.net/1721.1/131287 Rooney, Alan D. et al. "Calibrating the coevolution of Ediacaran life and environment." Proceedings of the National Academy of Sciences 117, 29 (July 2020): 16824-16830. © 2020 National Academy of Sciences en http://dx.doi.org/10.1073/pnas.2002918117 Proceedings of the National Academy of Sciences Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Proceedings of the National Academy of Sciences PNAS |
| spellingShingle | Rooney, Alan D. Cantine, Marjorie Dianne Bergmann, Kristin Gómez-Pérez, Irene Al Baloushi, Badar Boag, Thomas H. Busch, James F. Sperling, Erik A. Strauss, Justin V. Calibrating the coevolution of Ediacaran life and environment |
| title | Calibrating the coevolution of Ediacaran life and environment |
| title_full | Calibrating the coevolution of Ediacaran life and environment |
| title_fullStr | Calibrating the coevolution of Ediacaran life and environment |
| title_full_unstemmed | Calibrating the coevolution of Ediacaran life and environment |
| title_short | Calibrating the coevolution of Ediacaran life and environment |
| title_sort | calibrating the coevolution of ediacaran life and environment |
| url | https://hdl.handle.net/1721.1/131287 |
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