Extensive primary production promoted the recovery of the Ediacaran Shuram excursion.

Autor: Cañadas F; Department of Earth Sciences, University College London, London, UK. fuencisla.canadas.16@ucl.ac.uk.; Centre for Astrobiology (CAB, CSIC-INTA), Madrid, Spain. fuencisla.canadas.16@ucl.ac.uk., Papineau D; Department of Earth Sciences, University College London, London, UK.; London Centre for Nanotechnology, University College London, London, UK.; Centre for Planetary Sciences, University College London & Birkbeck College London, London, UK.; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China., Leng MJ; National Environmental Isotope Facility, British Geological Survey, Nottingham, UK.; School of Biosciences, University of Nottingham, Loughborough, UK., Li C; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Jan 10; Vol. 13 (1), pp. 148. Date of Electronic Publication: 2022 Jan 10.
DOI: 10.1038/s41467-021-27812-5
Abstrakt: Member IV of the Ediacaran Doushantuo Formation records the recovery from the most negative carbon isotope excursion in Earth history. However, the main biogeochemical controls that ultimately drove this recovery have yet to be elucidated. Here, we report new carbon and nitrogen isotope and concentration data from the Nanhua Basin (South China), where δ 13 C values of carbonates (δ 13 C carb ) rise from - 7‰ to -1‰ and δ 15 N values decrease from +5.4‰ to +2.3‰. These trends are proposed to arise from a new equilibrium in the C and N cycles where primary production overcomes secondary production as the main source of organic matter in sediments. The enhanced primary production is supported by the coexisting Raman spectral data, which reveal a systematic difference in kerogen structure between depositional environments. Our new observations point to the variable dominance of distinct microbial communities in the late Ediacaran ecosystems, and suggest that blooms of oxygenic phototrophs modulated the recovery from the most negative δ 13 C carb excursion in Earth history.
(© 2022. The Author(s).)
Databáze: MEDLINE
Externí odkaz: