Geochemical Perspectives Letters最新文献_第2页

Direct evidence of CO2 drawdown through enhanced weathering in soils 土壤风化增强导致二氧化碳减少的直接证据

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-04-30 DOI: 10.7185/geochemlet.2415

T. Linke, E.H. Oelkers, S.C. Möckel, S.R. Gislason

引用次数: 0

Xenon compatibility in magmatic processes: Hadean to current contexts 岩浆过程中的氙兼容性：远古至现代

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-04-22 DOI: 10.7185/geochemlet.2413

Q. Chen, C. Sanloup, D. Horlait, G. Shen

{"title":"Xenon compatibility in magmatic processes: Hadean to current contexts","authors":"Q. Chen, C. Sanloup, D. Horlait, G. Shen","doi":"10.7185/geochemlet.2413","DOIUrl":"https://doi.org/10.7185/geochemlet.2413","url":null,"abstract":"Xenon (Xe) behaviour in petrological processes, albeit essential to constrain mantle ingassing and degassing models, is elusive due to its volatile nature, and lack of direct investigation at the pressures (P) and temperatures (T) relevant to magma formation and crystallisation at depth. Xenon stands out amongst noble gases due to its unique reactivity with silicates of the lower crust and upper mantle, which could at least partially explain that published mineral/melt partitioning coefficients span up to six orders of magnitude. We report partition coefficients of Xe using in situ X-ray fluorescence at high P and T, and mass spectrometry analyses. Xenon is found to be moderately incompatible in anorthite-clinopyroxene mix in equilibrium with basalt (partition coefficient value of 0.16 ± 0.06), and compatible in olivine in equilibrium with basalt (partition coefficients in the range 88 ± 22 to 302 ± 46). While Xe is, thus, concentrated in basaltic melts coexisting with crystallising pyroxenes and feldspars, it is strongly retained in olivine at depth. Consequently, Xe originally contained in solid Earth has been preferentially retained at depth throughout Earth’s history, from the magma ocean stages to present day partial mantle melting processes.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"39 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140635077","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

Comparative 142Nd and 182W study of MORBs and the 4.5 Gyr evolution of the upper mantle MORBs 的 142Nd 和 182W 对比研究以及上地幔的 4.5 Gyr 演变

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-04-11 DOI: 10.7185/geochemlet.2412

D. Peters, H. Rizo, J. O’Neil, C. Hamelin, S.B. Shirey

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The isotopic signature of UV during bacterial reduction 细菌还原过程中紫外线的同位素特征

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-04-09 DOI: 10.7185/geochemlet.2411

A.R. Brown, M. Molinas, Y. Roebbert, R. Faizova, T. Vitova, A. Sato, M. Hada, M. Abe, M. Mazzanti, S. Weyer, R. Bernier-Latmani

{"title":"The isotopic signature of UV during bacterial reduction","authors":"A.R. Brown, M. Molinas, Y. Roebbert, R. Faizova, T. Vitova, A. Sato, M. Hada, M. Abe, M. Mazzanti, S. Weyer, R. Bernier-Latmani","doi":"10.7185/geochemlet.2411","DOIUrl":"https://doi.org/10.7185/geochemlet.2411","url":null,"abstract":"The two step electron transfer during bacterial reduction of UVI to UIV is typically accompanied by mass-independent fractionation of the 238U and 235U isotopes, whereby the heavy isotope accumulates in the reduced product. However, the role of the UV intermediate in the fractionation mechanism is unresolved due to the challenges associated with its chemical stability. Here, we employed the UV stabilising ligand, dpaea2-, to trap aqueous UV during UVI reduction by Shewanella oneidensis. Whilst the first reduction step from UVI to UV displayed negligible fractionation, reduction of UV to UIV revealed mass-dependent isotope fractionation (preferential reduction of the 235U), contrary to most previous observations. This surprising behaviour highlights the control that the U-coordinating ligand exerts over the balance between reactant U supply, electron transfer rate, and UIV product sequestration, suggesting that UV speciation should be considered when using U isotope ratios to reconstruct environmental redox conditions.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"19 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140570494","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

Corrigendum to “Early precipitated micropyrite in microbialites: A capsule of microbial sulfur cycling” by Marin-Carbonne et al., 2022 微生物岩中的早期沉淀黄铁矿：微生物硫循环的胶囊 "的更正，Marin-Carbonne 等人，2022 年

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-03-19 DOI: 10.7185/geochemlet.2209cor

J. Marin-Carbonne, M.-N. Decraene, R. Havas, L. Remusat, V. Pasquier, J. Alléon, N. Zeyen, A. Bouton, S. Bernard, S. Escrig, N. Olivier, E. Vennin, A. Meibom, K. Benzerara, C. Thomazo

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Fractionation of Nb/Ta during subduction of carbonate-rich sediments 富碳酸盐沉积物俯冲过程中 Nb/Ta 的分馏

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-03-05 DOI: 10.7185/geochemlet.2410

A. Bragagni, R. Avanzinelli, C. Münker, F. Mastroianni, S. Conticelli

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Pyrite-based trace element fingerprints for methane and oil seepage 基于黄铁矿的甲烷和石油渗流痕量元素指纹图谱

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-03-05 DOI: 10.7185/geochemlet.2409

D. Smrzka, Z. Lin, P. Monien, T. Chen, W. Bach, J. Peckmann, G. Bohrmann

{"title":"Pyrite-based trace element fingerprints for methane and oil seepage","authors":"D. Smrzka, Z. Lin, P. Monien, T. Chen, W. Bach, J. Peckmann, G. Bohrmann","doi":"10.7185/geochemlet.2409","DOIUrl":"https://doi.org/10.7185/geochemlet.2409","url":null,"abstract":"Pyrite forms at marine hydrocarbon seeps as the result of the microbial oxidation of methane, organic matter, and crude oil coupled to sulphate reduction. Redox sensitive and nutrient trace elements in pyrite may hold valuable information on present and past seepage events, the evolution of fluid composition, as well as the presence of heavy hydrocarbon compounds from crude oil. This study uses the trace element compositions of pyrite that formed at methane seeps and crude oil-dominated seeps to constrain element mobilities during the sulphate reduction processes, and examine the degree to which specific trace elements are captured by pyrite. Pyrite forming at oil seeps shows high Mn/Fe ratios and high Mo content compared to pyrite from methane seeps. These patterns suggest either more intense or persistent sulphidic conditions, or an intensified manganese (oxy)hydroxide shuttle process at oil seeps. Copper and Zn are enriched in oil seepage-derived pyrite while Ni and V enrichment is less pronounced, suggesting either a selective uptake of specific elements by pyrite, or varying trace element compositions of organic compounds oxidised via microbial reduction.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"43 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140046188","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

Kinetics of low-temperature H2 production in ultramafic rocks by ferroan brucite oxidation 超基性岩中铁青金石氧化作用低温产生 H2 的动力学过程

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-03-05 DOI: 10.7185/geochemlet.2408

W. Carlin, B. Malvoisin, F. Brunet, B. Lanson, N. Findling, M. Lanson, T. Fargetton, L. Jeannin, O. Lhote

{"title":"Kinetics of low-temperature H2 production in ultramafic rocks by ferroan brucite oxidation","authors":"W. Carlin, B. Malvoisin, F. Brunet, B. Lanson, N. Findling, M. Lanson, T. Fargetton, L. Jeannin, O. Lhote","doi":"10.7185/geochemlet.2408","DOIUrl":"https://doi.org/10.7185/geochemlet.2408","url":null,"abstract":"Ferroan brucite, (Mg,Fe)(OH)2, is among the potential mineral candidates for low temperature (<423 K) abiotic H2 production in ultramafic rocks. To verify this assumption, synthetic ferroan brucite with grain size similar to that observed in natural samples (40–100 nm) was reacted with pure water at temperatures ranging from 348 to 573 K. Experimental products are consistent with the reaction 3 Fe(OH)2brucite = Fe3O4 + H2 + 2 H2O. This reaction reached completion in ∼2 months at 378 K and is thermally activated with an activation energy of 145 ± 1 kJ/mol. The standard state formation enthalpy and the third law entropy of amakinite, Fe(OH)2, were refined from the experimental dataset. The new thermodynamic parameters imply that ferroan brucite is stable at significantly lower hydrogen activity than previously calculated. The alteration of Fe-brucite produces H2 at rates compatible with present day observations of H2 emissions in natural settings (ophiolite and mid-oceanic ridges). However, efficient fluid renewal is required, as opposed to H2 production through olivine serpentinisation, which can proceed in static hydraulic conditions.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"23 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071343","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

Corrigendum to “Titanium isotope constraints on the mafic sources and geodynamic origins of Archean crust” by Hoare et al., 2023 Hoare等人撰写的 "关于阿基坦地壳岩浆来源和地球动力起源的钛同位素约束 "的更正，2023年

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-02-26 DOI: 10.7185/geochemlet.2342cor

L. Hoare, L.J.A. Rzehak, S. Kommescher, M. Jansen, M.T. Rosing, T. Nagel, M.-A. Millet, J.E. Hoffmann, R.O.C. Fonseca

引用次数: 0

Imaging of boron in altered mantle rocks illuminates progressive serpentinisation episodes 蚀变地幔岩石中的硼成像揭示了渐进式蛇化过程

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-02-23 DOI: 10.7185/geochemlet.2407

A.D. Evans, C.D. Standish, J.A. Milton, A.G. Robbins, D. Craw, G.L. Foster, D.A.H. Teagle

{"title":"Imaging of boron in altered mantle rocks illuminates progressive serpentinisation episodes","authors":"A.D. Evans, C.D. Standish, J.A. Milton, A.G. Robbins, D. Craw, G.L. Foster, D.A.H. Teagle","doi":"10.7185/geochemlet.2407","DOIUrl":"https://doi.org/10.7185/geochemlet.2407","url":null,"abstract":"Serpentinised mantle rocks reflect the cumulative sum of multiple alteration events, but to date, identifying distinct serpentinisation episodes has remained challenging due to limited knowledge of the spatial distribution of tracers of fluid-rock exchange. Here we present novel high spatial resolution (∼10 μm) boron, nickel, calcium, and lithium concentration maps combined with in situ boron isotope analyses of strongly serpentinised mantle peridotites from the Troodos ophiolite, Cyprus. Our maps indicate strongly heterogenous boron concentrations with high boron concentrations in early formed serpentine replacing olivine but much lower boron contents in mesh-textured serpentine and bastitic pyroxene. Late stage crosscutting serpentine veins have very low boron concentrations. In contrast, boron isotope measurements, made at coarser scales, are remarkably uniform (mean value +11.9 ± 3.2 ‰, 1σ, n = 49). We interpret the high boron serpentine as reflecting the partial preservation of an early pervasive serpentinisation episode by fluids with high boron concentrations sourced from the dehydration of the subducting Cyprus slab. Subsequent serpentine phases with moderate to low boron reflect progressive recrystallisation and leaching by low boron concentration meteoric waters.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"49 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139957000","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