Arsenic stress after the Proterozoic glaciations
| Type | Article | ||||||||||||
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| Date | 2015-12-04 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Chi Fru Ernest1, 2, Arvestål Emma2, 3, Callac Nolwenn 1, El Albani Abderrazak4, Kilias Stephanos5, Argyraki Ariadne5, Jakobsson Martin1 |
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| Affiliation(s) | 1 : Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, SE-106 91, Stockholm, Sweden 2 : Department of Paleobiology, Nordic Centre for Earth Evolution, Swedish Museum of Natural History, SE-104 05, Stockholm, Box 50007, Sweden 3 : Department of Earth Sciences, Uppsala University, Paleobiology, SE-752 36, Uppsala, Sweden 4 : Université de Poitiers UMR 7285-CNRS, Institut de Chimie des Milieux et Matériaux de Poitiers-5, rue Albert Turpin (Bât B35) 86073 Poitiers cedex 5 : Department of Economic Geology and Geochemistry Faculty of Geology and Geoenvironment, University of Athens Panepistimiopolis Zographou, 157 84 , Athens, Greece |
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| Source | Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2015-12-04 , Vol. 5 , N. 1 , P. 17789 (12p.) | ||||||||||||
| DOI | 10.1038/srep17789 | ||||||||||||
| Keyword(s) | Chemical origin of life, Palaeoceanography | ||||||||||||
| Abstract | Protection against arsenic damage in organisms positioned deep in the tree of life points to early evolutionary sensitization. Here, marine sedimentary records reveal a Proterozoic arsenic concentration patterned to glacial-interglacial ages. The low glacial and high interglacial sedimentary arsenic concentrations, suggest deteriorating habitable marine conditions may have coincided with atmospheric oxygen decline after ~2.1 billion years ago. A similar intensification of near continental margin sedimentary arsenic levels after the Cryogenian glaciations is also associated with amplified continental weathering. However, interpreted atmospheric oxygen increase at this time, suggests that the marine biosphere had widely adapted to the reorganization of global marine elemental cycles by glaciations. Such a glacially induced biogeochemical bridge would have produced physiologically robust communities that enabled increased oxygenation of the ocean-atmosphere system and the radiation of the complex Ediacaran-Cambrian life. |
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