Nature Geoscience最新文献_第2页

Early start to volatile cycling 前期开始波动循环

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-18 DOI: 10.1038/s41561-025-01689-1

J. Elis Hoffmann

引用次数: 0

Transient marine bottom water oxygenation on continental shelves by 2.65 billion years ago 26.5亿年前大陆架上短暂的海洋底水氧合作用

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-16 DOI: 10.1038/s41561-025-01681-9

Xinming Chen, Chadlin M. Ostrander, Brett J. Holdaway, Brian Kendall, Ariel D. Anbar, Sune G. Nielsen, Jeremy D. Owens

{"title":"Transient marine bottom water oxygenation on continental shelves by 2.65 billion years ago","authors":"Xinming Chen, Chadlin M. Ostrander, Brett J. Holdaway, Brian Kendall, Ariel D. Anbar, Sune G. Nielsen, Jeremy D. Owens","doi":"10.1038/s41561-025-01681-9","DOIUrl":"https://doi.org/10.1038/s41561-025-01681-9","url":null,"abstract":"A growing body of evidence suggests that molecular oxygen (O2) accumulated in some shallow marine environments beneath the effectively anoxic Archaean atmosphere 4.0 to 2.5 billion years (Ga) ago. Yet, the temporal and spatial distribution of these oxygen oases is not well known. Here we use thallium (Tl) isotope ratios, which are sensitive to manganese oxide burial, to place constraints on the timing and tempo of marine oxygen oases between about 2.65 Ga and 2.50 Ga. Lower-than-crustal authigenic 205Tl/203Tl ratios are common in shales from the approximately 2.65 Ga Jeerinah Formation (Western Australia) and the 2.50 Ga Klein Naute Formation (South Africa). Particularly low 205Tl/203Tl ratios are found at 2.50 Ga, coincident with a pronounced ‘whiff’ of O2. These data can be explained by widespread seafloor manganese oxide burial, a scenario that requires persistent O2 penetration into marine sediments beneath regionally extensive marine oxygen oases. By contrast, 205Tl/203Tl ratios from the 2.60–2.52 Ga Nauga Formation (South Africa) do not deviate from crustal values, suggesting an intervening period of muted seafloor Mn oxide burial. Our data suggest that O2 accumulated over greater spatial extents and to greater depths than previously thought at about 2.65 Ga and that marine oxygenation was spatially and temporally dynamic well before the Great Oxidation Event began at about 2.4 Ga.","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"74 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143836941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oscillating Archean oxygen oases 振荡太古代氧气绿洲

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-16 DOI: 10.1038/s41561-025-01690-8

James Kasting

引用次数: 0

Archaean oxygen oases driven by pulses of enhanced phosphorus recycling in the ocean 太古宙的氧气绿洲是由海洋中磷循环增强的脉冲驱动的

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-16 DOI: 10.1038/s41561-025-01678-4

Fuencisla Cañadas, Romain Guilbaud, Philip Fralick, Yijun Xiong, Simon W. Poulton, Maria-Paz Martin-Redondo, Alberto G. Fairén

{"title":"Archaean oxygen oases driven by pulses of enhanced phosphorus recycling in the ocean","authors":"Fuencisla Cañadas, Romain Guilbaud, Philip Fralick, Yijun Xiong, Simon W. Poulton, Maria-Paz Martin-Redondo, Alberto G. Fairén","doi":"10.1038/s41561-025-01678-4","DOIUrl":"https://doi.org/10.1038/s41561-025-01678-4","url":null,"abstract":"Earth’s first rise in atmospheric oxygen between about 2.43 billion and 2.1 billion years ago fundamentally transformed the atmosphere and oceans, setting the foundation for the evolution of complex life. However, geochemical evidence reveals intermittent oceanic oxygen oases before the rise of atmospheric oxygen, although the mechanisms that drove the production and accumulation of oxygen remain poorly constrained. Here we present redox-sensitive trace metal and iron speciation data, and phosphorus phase partitioning results, for a 2.93-billion-year-old drill core from the Red Lake area, Canada, to reconstruct oceanic phosphorus cycling and links to oxygen production in the dominantly anoxic, iron-rich Archaean ocean. Our data document one of the earliest known intervals of surface water oxygen accumulation, predating the first accumulation of atmospheric oxygen by about 500 Ma. These intervals were preceded by ferruginous intervals and intervals of enhanced sulfide availability, which led to pulsed increases in oceanic phosphorus bioavailability via anoxic recycling from sediments. Enhanced phosphorus bioavailability would have helped stimulate photosynthetic primary productivity and organic carbon burial, probably exerting a major control on the episodic development of oxygen oases in the late Archaean ocean. This, in turn, led to a critical transitional phase in the development of an oxygenated surface environment.","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"26 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143836942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Davemaoite’s deep mantle disruption Davemaoite的深地幔断裂

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-09 DOI: 10.1038/s41561-025-01673-9

Oliver Tschauner

引用次数: 0

Emergence of wind ripples controlled by mechanics of grain–bed impacts 由颗粒床撞击力学控制的风波纹的出现

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-08 DOI: 10.1038/s41561-025-01672-w

C. W. Lester, A. B. Murray, Orencio Duran, B. Andreotti, P. Claudin

{"title":"Emergence of wind ripples controlled by mechanics of grain–bed impacts","authors":"C. W. Lester, A. B. Murray, Orencio Duran, B. Andreotti, P. Claudin","doi":"10.1038/s41561-025-01672-w","DOIUrl":"https://doi.org/10.1038/s41561-025-01672-w","url":null,"abstract":"Periodic sediment patterns have been observed on Earth in riverbeds and sand and snow deserts, but also in other planetary environments. One of the most ubiquitous patterns, familiar wind or ‘impact’ ripples, adorns sand beaches and arid regions on Earth. The observation of aeolian impact ripples on Mars the same size as their terrestrial counterparts despite a thinner atmosphere raises questions about their formation. Here we show in a numerical simulation that the emergent wavelength of impact ripples is controlled by the mechanics of grain–bed impacts and not the characteristic trajectories of grains above the bed. We find that the distribution of grain trajectories in transport is essentially scale-free, invoking the proximity of a critical point and precluding a transport-related length scale that selects ripple wavelengths. By contrast, when a grain strikes the bed, the process leading to grain ejections introduces a collective granular length scale that determines the scale of the ripples. We propose a theoretical model that predicts a relatively constant ripple size for most planetary conditions. In addition, our model predicts that for high-density atmospheres, such as on Venus, or for sufficiently large sand grains on Earth, impact ripples propagate upwind. Although wind-tunnel and field experiments are needed to confirm the existence of such ‘antiripples’, we suggest that our quantitative model of wind-blown sediment transport may be used to deduce geological and environmental conditions on other planets from the sizes and propagation speeds of impact ripples.","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"74 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Proximate measurements of a giant iceberg reveal the effects of meltwater on upper ocean properties 对一座巨大冰山的近似测量揭示了融水对上层海洋特性的影响

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-07 DOI: 10.1038/s41561-025-01660-0

引用次数: 0

The increase of aquatic vegetation raised methane emissions from northern lakes 水生植物的增加增加了北部湖泊的甲烷排放量

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-07 DOI: 10.1038/s41561-025-01668-6

引用次数: 0

Weak asthenosphere beneath the Eurasian interior inferred from Aral Sea desiccation 从咸海干燥推断欧亚大陆内部的弱软流层

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-07 DOI: 10.1038/s41561-025-01664-w

Wenzhi Fan, Teng Wang, Sylvain Barbot, Dong Fang, Jiangjun Ran, Heng Luo

{"title":"Weak asthenosphere beneath the Eurasian interior inferred from Aral Sea desiccation","authors":"Wenzhi Fan, Teng Wang, Sylvain Barbot, Dong Fang, Jiangjun Ran, Heng Luo","doi":"10.1038/s41561-025-01664-w","DOIUrl":"https://doi.org/10.1038/s41561-025-01664-w","url":null,"abstract":"The rheology of the lower crust and upper mantle influences Earth’s plate tectonic style of mantle convection, yet its spatial variability is poorly resolved, particularly in continental interiors. Here we use satellite radar interferometry to map the delayed uplift resulting from the desiccation of the Aral Sea, which has lost ~1,000 km3 of water since 1960. From this we constrain the rheology of the underlying upper mantle by elastic and viscoelastic modelling. We find a long-wavelength uplift of up to ~7 mm yr–1 between 2016 and 2020 that decays radially from the Aral Sea. This uplift pattern is best explained by viscoelastic relaxation of the asthenosphere below a strong lithospheric mantle. We estimate that the asthenosphere has an effective viscosity of 4–7 × 1019 Pa s below 130–190 km depth, slightly larger than the values inferred from post-seismic deformation at subduction zones, but 1–2 orders of magnitude smaller than estimates from glacial isostatic adjustment in other tectonically stable regions. Such uplift highlights the potential for human activities to influence deep-Earth dynamics and the interconnectedness of surface and mantle processes.","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"18 1","pages":""},"PeriodicalIF":18.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Humans move water and mantle 人类移动水和地幔

IF 18.3 1区地球科学

Nature Geoscience Pub Date : 2025-04-07 DOI: 10.1038/s41561-025-01665-9

Simon Lamb

引用次数: 0