Multiple Palaeoproterozoic carbon burial episodes and excursions
Organic-rich rocks (averaging 2–5% total organic carbon) and positive carbonate-carbon isotope excursions (‰δC13>+5‰ and locally much higher, i.e. the Lomagundi-Jatuli Event) are hallmark features of Palaeoproterozoic successions and are assumed to archive a global event of unique environment...
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crescholarship:10.31223/osf.io/h7x5k 2024-04-07T07:54:57+00:00 Multiple Palaeoproterozoic carbon burial episodes and excursions Martin, Adam Condon, Daniel Prave, Anthony Lepland, Aivo Fallick, Anthony Romashkin, A Medvedev, P Rychanchik, D 2017 http://dx.doi.org/10.31223/osf.io/h7x5k unknown California Digital Library (CDL) http://opensource.org/licenses/AFL-3.0 posted-content 2017 crescholarship https://doi.org/10.31223/osf.io/h7x5k 2024-03-08T03:58:03Z Organic-rich rocks (averaging 2–5% total organic carbon) and positive carbonate-carbon isotope excursions (‰δC13>+5‰ and locally much higher, i.e. the Lomagundi-Jatuli Event) are hallmark features of Palaeoproterozoic successions and are assumed to archive a global event of unique environmental conditions following the c. 2.3 Ga Great Oxidation Event. Here we combine new and published geochronology that shows that the main Palaeoproterozoic carbon burial episodes (CBEs) preserved in Russia, Gabon and Australia were temporally discrete depositional events between c. 2.10 and 1.85 Ga. In northwest Russia we can also show that timing of the termination of the Lomagundi-Jatuli Event may have differed by up to 50 Ma between localities, and that Ni mineralisation occurred at c. 1920 Ma. Further, CBEs have traits in common with Mesozoic Oceanic Anoxic Events (OAEs); both are exceptionally organic-rich relative to encasing strata, associated with contemporaneous igneous activity and marked by organic carbon isotope profiles that exhibit a stepped decrease followed by a stabilisation period and recovery. Although CBE strata are thicker and of greater duration than OAEs (100 s of metres versus metres, ∼106 years versus ∼105 years), their shared characteristics hint at a commonality of cause(s) and feedbacks. This suggests that CBEs represent processes that can be either basin-specific or global in nature and a combination of circumstances that are not unique to the Palaeoproterozoic. Our findings urge circumspection and re-consideration of models that assume CBEs are a Deep Time singularity. Other/Unknown Material Northwest Russia eScholarship Repository (University of California) |
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Organic-rich rocks (averaging 2–5% total organic carbon) and positive carbonate-carbon isotope excursions (‰δC13>+5‰ and locally much higher, i.e. the Lomagundi-Jatuli Event) are hallmark features of Palaeoproterozoic successions and are assumed to archive a global event of unique environmental conditions following the c. 2.3 Ga Great Oxidation Event. Here we combine new and published geochronology that shows that the main Palaeoproterozoic carbon burial episodes (CBEs) preserved in Russia, Gabon and Australia were temporally discrete depositional events between c. 2.10 and 1.85 Ga. In northwest Russia we can also show that timing of the termination of the Lomagundi-Jatuli Event may have differed by up to 50 Ma between localities, and that Ni mineralisation occurred at c. 1920 Ma. Further, CBEs have traits in common with Mesozoic Oceanic Anoxic Events (OAEs); both are exceptionally organic-rich relative to encasing strata, associated with contemporaneous igneous activity and marked by organic carbon isotope profiles that exhibit a stepped decrease followed by a stabilisation period and recovery. Although CBE strata are thicker and of greater duration than OAEs (100 s of metres versus metres, ∼106 years versus ∼105 years), their shared characteristics hint at a commonality of cause(s) and feedbacks. This suggests that CBEs represent processes that can be either basin-specific or global in nature and a combination of circumstances that are not unique to the Palaeoproterozoic. Our findings urge circumspection and re-consideration of models that assume CBEs are a Deep Time singularity. |
format |
Other/Unknown Material |
author |
Martin, Adam Condon, Daniel Prave, Anthony Lepland, Aivo Fallick, Anthony Romashkin, A Medvedev, P Rychanchik, D |
spellingShingle |
Martin, Adam Condon, Daniel Prave, Anthony Lepland, Aivo Fallick, Anthony Romashkin, A Medvedev, P Rychanchik, D Multiple Palaeoproterozoic carbon burial episodes and excursions |
author_facet |
Martin, Adam Condon, Daniel Prave, Anthony Lepland, Aivo Fallick, Anthony Romashkin, A Medvedev, P Rychanchik, D |
author_sort |
Martin, Adam |
title |
Multiple Palaeoproterozoic carbon burial episodes and excursions |
title_short |
Multiple Palaeoproterozoic carbon burial episodes and excursions |
title_full |
Multiple Palaeoproterozoic carbon burial episodes and excursions |
title_fullStr |
Multiple Palaeoproterozoic carbon burial episodes and excursions |
title_full_unstemmed |
Multiple Palaeoproterozoic carbon burial episodes and excursions |
title_sort |
multiple palaeoproterozoic carbon burial episodes and excursions |
publisher |
California Digital Library (CDL) |
publishDate |
2017 |
url |
http://dx.doi.org/10.31223/osf.io/h7x5k |
genre |
Northwest Russia |
genre_facet |
Northwest Russia |
op_rights |
http://opensource.org/licenses/AFL-3.0 |
op_doi |
https://doi.org/10.31223/osf.io/h7x5k |
_version_ |
1795671819770920960 |