This file was created by the TYPO3 extension publications --- Timezone: CEST Creation date: 2026-04-23 Creation time: 09:51:00 --- Number of references 7 article FAN2026105284 The terminal Ediacaran (ca. 551–533 Ma) was characterized by profound biological innovations and environmental upheavals, in which phosphorus (P)—the ultimate limiting nutrient for marine productivity—is postulated to have played a key role. However, P availability in the terminal Ediacaran ocean remains uncertain due to the lack of an appropriate proxy record. To better reconstruct seawater P levels during this time interval, we analyzed carbonate-associated phosphate [CAP; expressed as CAP/(Ca + Mg)], a new proxy for P availability in ancient oceans, in three upper Ediacaran successions: the Nama Group (Namibia), the Shibantan Member of the Dengying Formation (Wuhe, South China), and the Algal Dolomite, Gaojiashan and Beiwan members of the Dengying Formation (Gaojiashan, South China). Our results reveal consistently low CAP/(Ca + Mg) values (range: 0.02–0.69 mmol/mol, mean: 0.13 ± 0.01 mmol/mol, 2σ, the same below) for all study sections, falling at the lower end of modern marine carbonate values. Lithofacies, carbonate oxygen isotopes, Mn/Sr and Mg/(Mg + Ca) ratios indicate possible influences from release of Fe-bound P, meteoric diagenesis, recrystallization or dolomitization. The low CAP/(Ca + Mg) values thus represent a maximum estimate for the seawater P availability. The low CAP values from two geographically separated cratons likely reflect a generally small oceanic inorganic P reservoir at least in shelves. This study provides insights into the interplay between nutrient cycling, redox dynamics, and biological evolution during one of the most pivotal transitional periods in Earth history. 2026 0921-8181 https://doi.org/10.1016/j.gloplacha.2026.105284 Global and Planetary Change 258 105284 Redox conditions, Nama Assemblage, Biomineralization, Oxygen level, Marine productivity, South China https://www.sciencedirect.com/science/article/pii/S0921818126000056 Yonghan Fan Meng Cheng Xinyang Chen Catherine Rose Haiyang Wang Zihu Zhang Thomas J. 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Bowyer Fabio Messori Rachel Wood Ulf Linnemann Esther Rojo-Perez Mandy Zieger-Hofmann Johannes Zieger Junias Ndeunyema Martin Shipanga Bontle Mataboge Dan Condon Catherine V. Rose Collen-Issia Uahengo Sean P. Gaynor Inigo A. Müller Gerd Geyer Torsten Vennemann Joshua H.F.L. Davies Maria Ovtcharova article Pescarini2025 Article 2025 10.1029/2024JB030612 Journal of Geophysical Research: Solid Earth 130 3 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105000239297&doi=10.1029%2f2024JB030612&partnerID=40&md5=e50dc5cd3cf3581c64140f12d2739944 Cited by: 2 Thales Pescarini Ricardo I. F. Trindade David A. D. Evans Joseph L. Kirschvink James Pierce Henrique A. Fernandes article Gong2025 Article 2025 10.1016/j.gloplacha.2024.104668 Global and Planetary Change 245 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85211358096&doi=10.1016%2fj.gloplacha.2024.104668&partnerID=40&md5=fcfe82e0215c7c6274e741dd975dcbb1 Cited by: 5; All Open Access, Green Open Access Zheng Gong Iona Baillie Lyle L. 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