A sedimentary record of the evolution of the global marine phosphorus cycle

IF 2.7 2区 地球科学 Q2 BIOLOGY Geobiology Pub Date : 2022-12-05 DOI:10.1111/gbi.12536
Noah J. Planavsky, Dan Asael, Alan D. Rooney, Leslie J. Robbins, Benjamin C. Gill, Carol M. Dehler, Devon B. Cole, Susannah M. Porter, Gordon D. Love, Kurt O. Konhauser, Christopher T. Reinhard
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引用次数: 6

Abstract

Phosphorus (P) is typically considered to be the ultimate limiting nutrient for Earth's biosphere on geologic timescales. As P is monoisotopic, its sedimentary enrichment can provide some insights into how the marine P cycle has changed through time. A previous compilation of shale P enrichments argued for a significant change in P cycling during the Ediacaran Period (635–541 Ma). Here, using an updated P compilation—with more than twice the number of samples—we bolster the case that there was a significant transition in P cycling moving from the Precambrian into the Phanerozoic. However, our analysis suggests this state change may have occurred earlier than previously suggested. Specifically in the updated database, there is evidence for a transition ~35 million years before the onset of the Sturtian Snowball Earth glaciation in the Visingsö Group, potentially divorcing the climatic upheavals of the Neoproterozoic from changes in the Earth's P cycle. We attribute the transition in Earth's sedimentary P record to the onset of a more modern-like Earth system state characterized by less reducing marine conditions, higher marine P concentrations, and a greater predominance of eukaryotic organisms encompassing both primary producers and consumers. This view is consistent with organic biomarker evidence for a significant eukaryotic contribution to the preserved sedimentary organic matter in this succession and other contemporaneous Tonian marine sedimentary rocks. However, we stress that, even with an expanded dataset, we are likely far from pinpointing exactly when this transition occurred or whether Earth's history is characterized by a single or multiple transitions in the P cycle.

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全球海洋磷循环演化的沉积记录
磷(P)通常被认为是地球生物圈在地质时间尺度上的最终限制养分。由于磷是单同位素,其沉积富集可以提供一些关于海洋磷循环如何随时间变化的见解。先前的页岩P富集汇编认为,在埃迪卡拉纪(635-541 Ma), P循环发生了重大变化。在这里,我们使用更新的P汇编——样本数量增加了一倍多——来支持P循环从前寒武纪到显生宙的重大转变。然而,我们的分析表明,这种状态变化可能比之前认为的更早发生。具体来说,在更新后的数据库中,有证据表明,在Visingsö组的斯图亚特雪球地球冰期开始前3500万年,有可能将新元古代的气候剧变与地球P循环的变化分离开来。我们将地球沉积P记录的转变归因于一个更现代的地球系统状态的开始,其特征是海洋环境减少,海洋P浓度增加,真核生物占主导地位,包括初级生产者和消费者。这一观点与有机生物标志物证据一致,即真核生物对该演替和其他同时期的托尼海相沉积岩中保存的沉积有机质有重要贡献。然而,我们强调,即使有一个扩展的数据集,我们也可能远远不能准确地确定这种转变发生的时间,或者地球的历史是否以P循环中的单个或多个转变为特征。
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来源期刊
Geobiology
Geobiology 生物-地球科学综合
CiteScore
6.80
自引率
5.40%
发文量
56
审稿时长
3 months
期刊介绍: The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time. Geobiology invites submission of high-quality articles in the following areas: Origins and evolution of life Co-evolution of the atmosphere, hydrosphere and biosphere The sedimentary rock record and geobiology of critical intervals Paleobiology and evolutionary ecology Biogeochemistry and global elemental cycles Microbe-mineral interactions Biomarkers Molecular ecology and phylogenetics.
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