Earth and Planetary Science Letters最新文献

{"title":"Insights into the construction of the Oruanui magma reservoir from a comparison of zircon hosted in plagioclase and whole-rock","authors":"Tyler D. Schlieder ,&nbsp;Kari M. Cooper ,&nbsp;Adam J.R. Kent ,&nbsp;Darren Gravley ,&nbsp;Chad Deering ,&nbsp;Seth Rubin ,&nbsp;Adelicia Johnson","doi":"10.1016/j.epsl.2025.119495","DOIUrl":"10.1016/j.epsl.2025.119495","url":null,"abstract":"<div><div>Silicic magmatic systems play a critical role in the evolution of continental crust, and their eruptions could pose significant hazard to modern civilization. However, the processes of silicic magma storage and assembly prior to eruption are not well understood. We report new ²³⁸U-²³⁰Th ages and trace-element data for both rims and interiors of zircons separated from whole-rock (WR) samples and from bulk plagioclase separates from the 25.4 ka Oruanui eruption, Taupo Volcanic Zone, New Zealand. These data provide petrologic context and a more complete record of zircon crystallization than previous analyses of whole-rock hosted zircon interiors. In particular, whole-rock zircon surfaces are more restricted in composition than other zircon groups and define two clear compositional groups. Preservation of these two distinct compositional groups requires that the zircon must have been incorporated into the erupted Oruanui rhyolite at most ∼2 kyrs prior to eruption. In addition, systematic variations in Eu/Eu*, Hf, and Sc with Ti-in-zircon temperature and ²³⁸U-²³⁰Th age recorded in plagioclase-hosted zircon surfaces indicate that a shift to higher temperatures and less evolved compositions began at ∼40 ka and continued until amalgamation of the final erupted magma body. These new data demonstrate the additional insights available from detailed microanalytical investigations and support other studies indicating that large volumes of silicic magma accumulate in the crust via amalgamation of multiple smaller compositionally distinct portions of the broader magma reservoir.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119495"},"PeriodicalIF":4.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298240","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}

{"title":"Log-periodic signatures prior to volcanic eruptions: evidence from 34 events","authors":"Qinghua Lei ,&nbsp;Didier Sornette","doi":"10.1016/j.epsl.2025.119496","DOIUrl":"10.1016/j.epsl.2025.119496","url":null,"abstract":"<div><div>Forecasting volcanic eruptions is highly challenging owing to the inherent complexity and variability of volcanic processes. A key source of uncertainty stems from the sporadic nature of volcanic unrest, which is often marked by alternating phases of deflation and inflation, rather than a steady, predictable build-up toward eruption. This non-monotonic evolutionary pattern complicates eruption forecasting as it challenges conventional time-to-failure models that typically assume a simple smooth, monotonic power law acceleration. We develop a log-periodic power law singularity model that effectively captures the intermittent and non-monotonic rupture behaviour characteristic of reawakening volcanoes at the site scale. Mathematically, by generalising the power law exponent by extending it from real to complex numbers, this model captures the partial break of continuous scale invariance into discrete scale invariance, which underlies the sporadic nature of damage and rupture processes in heterogeneous crustal systems. Through both parametric and nonparametric analyses of a large dataset of 34 historical eruptions worldwide, we provide empirical evidence and theoretical reasoning that support the statistical significance of log-periodic oscillations superimposed on power law finite-time singularities during pre-eruptive volcanic unrest. Log-periodicity in volcanoes may originate from various mechanisms, including diffusion-dominated magma flow, magma-driven propagation of subparallel dykes, interaction between stress drop and stress corrosion, and/or interplay of inertia, damage, and healing within volcanic systems. Our findings have profound implications for volcano forecasting, as understanding and characterising log-periodic signatures could transform the intermittent nature of volcanic activity from a challenge into a key asset for improving predictability.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119496"},"PeriodicalIF":4.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290555","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}

{"title":"Corrigendum to “Nucleosynthetic Pt isotope anomalies and the Hf-W chronology of core formation in inner and outer solar system planetesimals” [Earth Planet. Sci. Lett. 576 (2021) 117211]","authors":"Fridolin Spitzer ,&nbsp;Christoph Burkhardt ,&nbsp;Francis Nimmo ,&nbsp;Thorsten Kleine","doi":"10.1016/j.epsl.2025.119506","DOIUrl":"10.1016/j.epsl.2025.119506","url":null,"abstract":"","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119506"},"PeriodicalIF":4.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290530","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}

{"title":"Methanol storage in high-pressure clathrate hydrates as a prolonged source of methane in large ocean worlds","authors":"Anna Pakhomova ,&nbsp;Baptiste Journaux ,&nbsp;Alexander Kurnosov ,&nbsp;Tiziana Boffa Ballaran ,&nbsp;Gabriel Tobie ,&nbsp;Michael Hanfland","doi":"10.1016/j.epsl.2025.119478","DOIUrl":"10.1016/j.epsl.2025.119478","url":null,"abstract":"<div><div>Large ocean worlds in the solar system and in other planetary systems likely contain significant fraction of volatile and organic compounds, which condition their habitability potential. Some of these compounds are known to combine with water molecules to form clathrate hydrates under pressure. Methanol is a volatile of a particular interest due to its expected presence in various icy bodies of the outer solar system and its disputable role in clathrate hydrates formation. However, the clathration process of methanol in complex compositions and under high pressures representative of these ocean worlds still remain unexplored. Herein, using high-pressure – low-temperature <em>in situ</em> single crystal X-ray diffraction, we demonstrate that high pressure facilitates incorporation of methanol in clathrate structure in presence of a promoter, with formation of mixed methanol-bearing clathrate hydrates. The preferential trapping of methanol at high-pressure offers an explanation for the non-detection of methanol on surfaces of large ocean worlds, while more common on small icy worlds. Moreover, the hydrogenolysis of enclathrated primordial methanol into methane presents a novel hypothesis for the deep-seated endogenic source of methane in Titan and potentially for other ocean worlds.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119478"},"PeriodicalIF":4.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290531","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}

{"title":"Assessing the timing of deep ocean oxygenation from uranium elemental and isotopic compositions of ophiolites","authors":"Joel B. Rodney ,&nbsp;Morten B. Andersen ,&nbsp;Daniel Stubbs ,&nbsp;C. Johan Lissenberg ,&nbsp;Omar Gianola ,&nbsp;Matthias Willbold ,&nbsp;Tim Elliott","doi":"10.1016/j.epsl.2025.119489","DOIUrl":"10.1016/j.epsl.2025.119489","url":null,"abstract":"<div><div>The concentration of dissolved oxygen in the deep oceans has varied over Earth History, but the timing of the transition from anoxic to oxic deep oceans is debated. Under modern-day, oxic, deep ocean conditions, alteration of the upper sections of mafic oceanic crust with U-rich seawater leads to U enrichment, low Th/U ratios, and heterogeneous ²³⁸U/²³⁵U ratios relative to fresh mid-ocean ridge basalt (MORB). Given the solubility behaviour of U, its uptake into altered oceanic crust (AOC) is expected to be smaller and less isotopically fractionated when deep oceans were anoxic and thus U-poor. Determining when, in the geological record, the U elemental and isotopic systematics of ancient oceanic crust first resemble modern day AOC should indicate when deep oceans became oxic. We provide U concentration, Th/U, and U isotopic data on upper-crustal sections of three ophiolites from 750 to 480 Ma, spanning the period inferred for deep ocean oxygenation (∼ 850 to 400 Ma). The ophiolites at 480 and 540 Ma have high U contents, low Th/U ratios, and variability in ²³⁸U/²³⁵U ratios like modern-day AOC, reflecting seawater alteration of oceanic crust under oxygenated seawater conditions. In contrast, the 750 Ma ophiolite does not show the distinctive decreasing Th/U with increasing U concentrations trend of modern AOC and has fewer samples with ²³⁸U/²³⁵U ratios perturbed from mantle values, reflecting alteration under largely anoxic deep ocean conditions. This is also supported by Fe³⁺/Fe_T ratios in these samples that are like unaltered modern MORB. Thus, our data suggest oxygenated deep oceans at some time between 750 and 540 Ma, either reflecting a full transition or intermittent deep ocean oxygenation events within an otherwise anoxic deep ocean.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119489"},"PeriodicalIF":4.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280942","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}

{"title":"Katabatic and foehn winds control the distribution of supraglacial lakes in Dronning Maud Land, Antarctica","authors":"Anirudha Mahagaonkar ,&nbsp;Geir Moholdt ,&nbsp;Quentin Glaude ,&nbsp;Thomas V. Schuler","doi":"10.1016/j.epsl.2025.119482","DOIUrl":"10.1016/j.epsl.2025.119482","url":null,"abstract":"<div><div>Meltwater ponding along the margins of Antarctica poses a threat to ice shelf stability, increasing the risk of accelerated inland ice mass loss. Understanding the key drivers of supraglacial lake formation is therefore essential for assessing the vulnerability and future stability of Antarctic ice shelves. In this study, we combine high-resolution simulation from the regional climate model <em>Modèle Atmosphérique Régional (MAR)</em> with satellite-derived records of supraglacial lakes in coastal Dronning Maud Land to investigate the role of topographic downslope winds on spatial lake distribution. We find that persistent katabatic winds and episodic foehn winds are key controls on the observed regional patterns of lakes. Katabatic winds, most persistent in eastern Dronning Maud Land, exert a sustained impact near grounding zones through snow erosion, scouring and sublimation. Foehn winds predominantly affect ice shelves on the lee (western) side of large ice rises and promontories, causing considerable surface warming. While these downslope winds directly contribute to surface melt and ponding during summer, they also precondition the surface year-round through wind-driven warming and sublimation. Statistical analysis of downslope wind exposure further allows us to identify other Antarctic ice shelves that may become vulnerable to future ponding as firn retention capacity is diminished.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119482"},"PeriodicalIF":4.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262613","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}

{"title":"The Detroit volcanic province and the early evolution of the Hawaiian mantle plume","authors":"Reed B. Mershon ,&nbsp;Aaron J. Pietruszka ,&nbsp;Michael O. Garcia ,&nbsp;Brian R. Jicha ,&nbsp;Arron R. Steiner ,&nbsp;Peng Jiang ,&nbsp;J. Michael Rhodes ,&nbsp;Michael J. Vollinger ,&nbsp;Gregory F. Moore","doi":"10.1016/j.epsl.2025.119484","DOIUrl":"10.1016/j.epsl.2025.119484","url":null,"abstract":"<div><div>Detroit Seamount, located near the northern end of the Emperor Seamounts within the Hawaiian-Emperor Chain (HEC), is thought to have formed ∼81–76 Ma when an active spreading center was located near the Hawaiian mantle plume. The origin of the isotopically depleted signatures of basaltic lavas from Detroit is controversial, requiring either entrained ambient upper mantle due to plume-ridge interaction or enhanced melting of an intrinsic depleted component under young, thin lithosphere. Here, we present new major and trace element abundances for drilled tholeiitic basalts from Ocean Drilling Program Sites 884, 1203, and 1204 to re-evaluate the origin of Detroit and its mantle source. Our results show that previously unstudied Site 884 lavas have the most depleted trace element signatures known from the HEC and represent melting of the ambient upper mantle. Seismic reflection data shows that Site 884 penetrated a volcanic platform to the east of Detroit. This platform and adjacent, likely coeval, seamounts further to the east are unlike modern Hawaiian volcanoes and, together with Detroit, form a “Detroit Volcanic Province” that is potentially analogous to the Galápagos Archipelago. Actual basalts from Detroit (shield lavas from Sites 883, 1203, and 1204) are derived from an intrinsic depleted source within the Hawaiian plume that is (1) chemically and isotopically similar to rare high-CaO tholeiitic shield basalts from Maunakea and (2) characterized by high Zr/Sm and Hf/Gd ratios similar to all Hawaiian shield lavas (and unlike those from Site 884). Quantitative modeling indicates that the mantle sources of Detroit and all Hawaiian shields contain ancient oceanic lithosphere, including both recycled oceanic crust (ROC) and the underlying recycled mantle lithosphere (RML). Detroit lavas were formed by the same degree of partial melting as Hawaiian shield lavas, which is inconsistent with the requirement of enhanced melting to preferentially sample an intrinsic depleted plume component. Instead, the Detroit source contained a smaller amount of strongly dehydrated ROC and a larger amount of RML related to the preferential upwelling of these materials during the earliest known portion of the HEC. Today, a similar combination of RML and strongly dehydrated ROC is observed only during pre-shield and postshield volcanism due to a concentric zonation of the modern Hawaiian plume.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119484"},"PeriodicalIF":4.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262712","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}

{"title":"Constraints from uranium and molybdenum isotope ratios on the origin of enriched mid-ocean ridge basalts","authors":"Joel B. Rodney ,&nbsp;Morten B. Andersen ,&nbsp;Bramley J. Murton ,&nbsp;Tim Elliott","doi":"10.1016/j.epsl.2025.119491","DOIUrl":"10.1016/j.epsl.2025.119491","url":null,"abstract":"<div><div>Most mid-ocean ridge basalts (MORB) are depleted in highly incompatible elements relative to the primitive mantle and are termed normal (N)-MORB. Some MORB, erupted at ridge segments distal from mantle hot-spots, are enriched in incompatible elements. The origin of these enriched (E)-MORB is debated, although many studies have proposed that recycled oceanic crust shapes their compositions. Uranium (U) and molybdenum (Mo) isotope ratios have been argued to trace the contribution of recycled oceanic crust in the source of N-MORB, which has high δ²³⁸U and low δ^98/95Mo relative to the bulk silicate Earth (BSE). Here, we provide U and Mo isotopic data on E-MORB samples from the northern mid-Atlantic ridge (13° &amp; 45° N). We analysed hand-picked, leached MORB glass, yielding ²³⁴U/²³⁸U near secular equilibrium, therefore reflecting samples unperturbed by surface processes. Samples have uniform δ²³⁸U and δ^98/95Mo, with means of −0.307 ± 0.032 ‰, 2sd, and −0.14 ± 0.04 ‰, 2sd, respectively, both within uncertainty of BSE, and distinct from N-MORB. These data, as well as unremarkable Ce/Pb and radiogenic Pb isotopic compositions in E-MORB globally, are incompatible with their sources containing recycled oceanic crust or continental derived sediments. Instead, our data fit with a model of low degree partial melting of the uppermost mantle that metasomatises the sub-oceanic lithosphere. Given BSE-like U isotopic compositions of E-MORB, that are isotopically unfractionated during low degree partial melting, we suggest that the initial melting event must have occurred prior to the recycling of isotopically distinct in U oceanic crust into the upper mantle (i.e., prior to ca. 600 Ma, the estimated time of deep ocean oxygenation). Metasomatised portions of oceanic lithospheric mantle preserve these ≥600 Ma U isotopic compositions, which are subducted and stirred back into the convecting upper mantle, ultimately to be sampled at ridges as E-MORB. Molybdenum isotopic compositions of E-MORB are in line with such a model but also reflect isotopic fractionation to higher δ^98/95Mo during low degree partial melting of ≥600 Ma upper mantle, that counter acts the lowering of δ^98/95Mo in the upper mantle by an on-going process of plate recycling.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119491"},"PeriodicalIF":4.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262612","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}

{"title":"Tectonic and climatic controls on late Cenozoic intra-arc basin development in the central Andes of southern Peru","authors":"Kurt E. Sundell ,&nbsp;Ryan Eden ,&nbsp;Richard H. Styron ,&nbsp;Dustin P. Villarreal ,&nbsp;Paola Usnayo ,&nbsp;Joel E. Saylor ,&nbsp;Oguz H. Göğüş ,&nbsp;Thomas J. Lapen ,&nbsp;Bruce Finney ,&nbsp;Jose Cardenas ,&nbsp;Victor Carlotto","doi":"10.1016/j.epsl.2025.119487","DOIUrl":"10.1016/j.epsl.2025.119487","url":null,"abstract":"<div><div>Intra-arc basin strata document the interplay between tectonics and climate in the central Andes. This is exemplified by a shift from fluvial to lacustrine-evaporitic depositional environments recorded in the 2.6 km-thick siliciclastic-carbonate basin fill of the Tincopalca Basin located in the Western Cordillera of southern Peru (∼16°S). Detrital zircon U-Pb geochronology yields age distributions dominated by syndepositional volcanism; maximum depositional ages bracket deposition between 28 and 21 Ma. A decrease in lacustrine carbonate δ¹⁸O values from ∼0 ‰ to -9 ‰ at 22–21 Ma, synchronous with lithologic evidence for basin closure can be explained by two nonunique interpretations: (1) prior attainment of high elevations in the Eastern Cordillera and attendant westward penetration of isotopically depleted eastern moisture, and/or (2) attainment of sufficient elevation in the Western Cordillera to exclude enriched western moisture. Results do not discriminate between rapid, large-magnitude surface uplift versus attainment of a threshold, moisture-blocking elevation in the Western Cordillera. Zircon εHf(t) in the Western Cordillera increases from -8 to 0 between 25 and 18 Ma, consistent with formation and subsequent removal of a lithospheric instability. Combining new and published data highlights the complex interactions between tectonics and climate in the following scenario. (1) Instability formation drove basin subsidence at 28–20 Ma. (2) Instability removal slowed subsidence during a transition to depleted eastern moisture, coeval with increasing zircon εHf(t) at 20–17 Ma and concomitant rapid surface uplift at 18–16 Ma. (3) Basin ponding and aridification occurred after 16 Ma in a deepening central Andean rain shadow.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119487"},"PeriodicalIF":4.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242174","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}

{"title":"A novel biomarker for deep-time methanogenesis – perspectives from nickel isotope fractionation in modern microbialites","authors":"Simon V. Hohl ,&nbsp;Xiaopeng Bian ,&nbsp;Sebastian Viehmann ,&nbsp;Shun-Chung Yang ,&nbsp;Robert J. Raad ,&nbsp;Patrick Meister ,&nbsp;Seth G. John","doi":"10.1016/j.epsl.2025.119492","DOIUrl":"10.1016/j.epsl.2025.119492","url":null,"abstract":"<div><div>Activity of methanogenic archaea on early Earth is mainly deduced based on modern processes and supported by the carbon isotope record (δ¹³C_carb). Recently, Ni isotopes preserved in authigenic carbonate have been proposed to provide a further signature to trace methanogenesis in ancient environments because methanogens require nickel (Ni) as a metal co-factor for key enzymes to produce CH₄. Further, uptake in cultured methanogens has been shown to fractionate stable Ni isotopes (δ⁶⁰Ni) from their aqueous medium, a process that could potentially be recorded in authigenic carbonates. Therefore, Ni isotopes in microbialites could provide valuable insights into whether methanogenesis was active in ancient microbial habitats. Here, we explore this idea using combined C<img>Ni isotope analyses on individual layers of microbial carbonates from the Lagoa Salgada, a Holocene ephemeral lake in Brazil where abundant microbialites formed in the presence of methanogens. Microbial carbonates show distinct positive δ¹³C_carb (up to +20 ‰) at negative δ⁶⁰Ni_carb values (down to -1.36 ‰) that can be linked to methanogenic metabolism—in contrast to higher δ⁶⁰Ni of ambient gastropod shells (+1.72 ‰) and authigenic non-lithified sediments from the lagoon (+1.1 to +1.58 ‰). Our results show that Ni isotopes in microbial carbonates are a promising novel isotope proxy for methanogenic Ni isotope fractionation. We anticipate this study as a starting point for future research on combined metallome and microbiome evolution reflected in microbialites through time on Earth and beyond.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"666 ","pages":"Article 119492"},"PeriodicalIF":4.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253402","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}