Applied Geochemistry最新文献

{"title":"Diffusion and retention of Co2+ and Zn2+ in compacted homocationic forms of illite: Role of the electrical double layer","authors":"Dimitra Zerva ,&nbsp;Martin A. Glaus ,&nbsp;John L. Provis ,&nbsp;Sergey V. Churakov","doi":"10.1016/j.apgeochem.2025.106312","DOIUrl":"10.1016/j.apgeochem.2025.106312","url":null,"abstract":"<div><div>Surface diffusion of cationic species has frequently been postulated to explain the results of diffusion studies in compacted clay minerals and clay rocks. However, the underlying mechanism of this process is not well understood, and the factors controlling the diffusive flux are not yet satisfactorily quantified. In this study, the role of ion-specific molecular interactions in the electric double layer formed at the clay mineral-fluid interface is investigated, particularly their effect on the diffusive transport of ⁵⁷Co²⁺ and ⁶⁵Zn²⁺ tracers. To this end, in-diffusion experiments were conducted at different background electrolyte concentrations in compacted illite with Li⁺, Na⁺, K⁺ and Cs⁺ forms. The alkali cations in this series have decreasing hydration enthalpy (<span><math><mrow><msub><mrow><mo>Δ</mo><mi>H</mi></mrow><mrow><mi>h</mi><mi>y</mi><mi>d</mi></mrow></msub></mrow></math></span>) and an increasing effective hydrated ion radius. The diffusion data were interpreted using the “two site protolysis non electrostatic surface complexation/electrical double layer” (2SPNE SC/EDL) model. The diffusion and sorption behaviour of ⁵⁷Co²⁺ and ⁶⁵Zn²⁺ in various background electrolyte concentrations and homoionic forms of illite was compared in terms of the effective diffusion coefficient <em>D</em>_<em>e</em> and the sorption distribution coefficient <em>R</em>_<em>d</em>. The extent of surface diffusion was assessed via surface diffusion ratio (<em>φ</em>). The results suggest that <span><math><mrow><msub><mrow><mo>Δ</mo><mi>H</mi></mrow><mrow><mi>h</mi><mi>y</mi><mi>d</mi></mrow></msub></mrow></math></span> of ions is a critical factor controlling surface charge neutralisation, and consequently the distribution of the mobile species between the diffuse layer near the mineral surface and the bulk-like water in macroscopic pores. Although ⁶⁵Zn²⁺ has higher <em>R</em>_<em>d</em> values compared to ⁵⁷Co²⁺, the surface diffusion phenomenon is equally relevant for both tracers studied in this work. For the 0.03 M and 0.1 M background electrolytes, <em>φ</em> follows the order <span><math><mrow><mi>L</mi><mi>i</mi><mo>≈</mo><mi>N</mi><mi>a</mi><mo>&gt;</mo><mi>K</mi><mo>&gt;</mo><mi>C</mi><mi>s</mi></mrow></math></span>, while in 0.5 M electrolyte solution the contribution of surface diffusion is negligible in most of the homocationic forms.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"181 ","pages":"Article 106312"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contrasting sources and fate of ammonium in groundwater systems of two large alluvial-lacustrine basins","authors":"Qinghua Li ,&nbsp;Yaojin Xiong ,&nbsp;Yamin Deng ,&nbsp;Yiqun Gan ,&nbsp;Yao Du","doi":"10.1016/j.apgeochem.2025.106297","DOIUrl":"10.1016/j.apgeochem.2025.106297","url":null,"abstract":"<div><div>Groundwater ammonium (NH₄⁺) contamination can threaten human health and disrupt surface ecological balance. Although the sources and fate of NH₄⁺-N in groundwater have been widely studied, comparative research on this issue between different large basins under contrasting sediment sources and hydrogeological structures is weak. In this study, we used a combination of water chemistry, stable isotopes (H/O/C/N), excitation-emission-matrix spectra and 16 S rRNA gene sequencing to reveal the differences in the sources and fate of NH₄⁺-N in groundwater between Poyang Lake Plain (PYP) and Dongting Lake Plain (DTP), two large alluvial-lacustrine plains in central Yangtze River. The results showed that NH₄⁺-N in DTP groundwater occurred in a more closed and reduced environment, with stronger water-rock interaction and richer organic matter compared to that in PYP groundwater. NH₄⁺-N in DTP groundwater mainly originates from the intensive degradation of organic matter up to methanogenic stage, while NH₄⁺-N in PYP groundwater is affected by the coupled influence of organic matter fermentation before the methanogenic stage and anthropogenic activities. In addition, the specific hydrogeochemical environment in PYP groundwater is favorable to the natural removal of NH₄⁺-N caused by processes such as anammox and Feammox. The sediment provenance and hydrogeological structure of the two large plains are the key factors determing the contrasting sources and fate of NH₄⁺-N in groundwater.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"180 ","pages":"Article 106297"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 methodological study on the analysis of organic matter associated with iron oxides in marine sediments","authors":"Milad Ezzati ,&nbsp;Yves Gélinas","doi":"10.1016/j.apgeochem.2025.106295","DOIUrl":"10.1016/j.apgeochem.2025.106295","url":null,"abstract":"<div><div>Coastal shelves significantly contribute to the burial of natural organic matter (NOM) in marine sediments, with about 21.5 ± 8.6% of NOM associated with reactive iron oxides, which preserve NOM from biodegradation. Quantifying this preserved NOM requires a method to release bound carbonaceous molecules from iron minerals. The citrate-bicarbonate-dithionate (CBD) method is commonly used to liberate NOM from iron oxides through reductive dissolution. This method includes a control experiment using an NaCl solution to distinguish NOM associated with iron oxides from that leaching out from other minerals. This study aims to determine if desorbed NOM during the control experiment comes from other minerals or is loosely bound to iron oxides. We synthesized lepidocrocite (γ-FeOOH) in the presence and absence of plankton-extracted NOM to mimic sorption and conducted similar experiments on kaolinite, montmorillonite, and their mixture, representing common clay minerals in sediments. Quantifying the carbon content revealed that NOM associated with γ-FeOOH is 1.5–9.0 times greater than with other minerals. Post-treatment results indicate a 22.2%–42.7% loss of NOM associated with iron oxides, suggesting that deducting NOM lost during the control step underestimates the amount of carbon preserved by iron minerals in marine sediments.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"180 ","pages":"Article 106295"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accumulation and maturation of organic matter in shales: The coal-bearing Permian Longtan Formation at Tucheng Syncline, Southwestern Guizhou, China","authors":"Qian Zhang ,&nbsp;Zhijun Jin ,&nbsp;Ende Deng ,&nbsp;Zaigang Xu ,&nbsp;Rukai Zhu ,&nbsp;Quanyou Liu ,&nbsp;Zhihua Yan ,&nbsp;Ke Hu ,&nbsp;Tianyu Zheng ,&nbsp;Zhazha Hu","doi":"10.1016/j.apgeochem.2024.106257","DOIUrl":"10.1016/j.apgeochem.2024.106257","url":null,"abstract":"<div><div>Compared with fully marine and lacustrine shales, coal-bearing analogues have been rarely investigated. This study attempts to deepen our insights into the provenance, deposition, maturity and organic matter pores (OMPs) of coal-bearing shales based on detailed organic geochemical and petrographic analysis of a profile of the Longtan Formation (LTF) at Tucheng Syncline, Southwestern Guizhou, China.</div><div>Our results showed that the overall total organic carbon (TOC) contents are high (15.51 wt% on average), generally larger than 2 wt% with some coal samples reaching up to 69.5 wt%. Macro- and microscopic observations suggested that terrestrial higher plant-derived macerals make up a predominant proportion to total organic matter, while quantitative analysis based on maceral counting and organic geochemistry revealed a large percentage of aquatic-derived organic matter in the LTF. The aquatic-derived organic matter is expected to affect the empirical relation between vitrinite reflectance (VR_r) and Rock-Eval T_max by showing a divergent regression line compared to that of the type III kerogen. Based on the pore morphology and the outline of dispersed organic matter, OMPs either show sharp edges in discernible terrestrial organic matter or bubble shapes in indistinct aquatic-derived organic matter. VR_r and T_max values range from 1.19 to 1.84 %VR_r (the mean value is 1.48%VR_r) and from 455 to 497 °C (469 °C on average precluding one anomalously high value of 555 °C), respectively. At this level of maturity, hydrocarbons have been generated in large quantities given the high organic matter content of the studied samples. Compared to the successful shale gas plays, e.g., the Barnett Shale and the Longmaxi Shale, the Longtan Shale (LTS) also shows good potential given its much larger thickness and TOC, appropriate thermal maturity. Nevertheless, cautious should be taken considering its smaller porosity and quartz content, which affect the storage capacity and the fracability of the LTS. This study contributes to a better understanding of the accumulation and maturation conditions of organic matter in coal-bearing shales.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"180 ","pages":"Article 106257"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diavik Waste Rock Project: Post-emplacement investigation of sulfide weathering from a deconstructed experimental waste-rock pile","authors":"Colleen Atherton ,&nbsp;David Wilson ,&nbsp;Steven P. Holland ,&nbsp;Katherine E. Raymond ,&nbsp;David R. Barsi ,&nbsp;Jordan Zak ,&nbsp;Leslie Smith ,&nbsp;David C. Sego ,&nbsp;Richard T. Amos ,&nbsp;Dogan Paktunc ,&nbsp;Carol J. Ptacek ,&nbsp;David W. Blowes","doi":"10.1016/j.apgeochem.2025.106293","DOIUrl":"10.1016/j.apgeochem.2025.106293","url":null,"abstract":"<div><div>Deconstruction of a 15 m high low-sulfide (0.035 wt% S) experimental waste-rock pile was conducted to obtain a dense, spatially located sample set for characterization of the solid-phase mineralogy, microbiological community composition, and pore-water geochemistry. The experimental test pile, located in northern Canada, was deconstructed 8 years after construction. Pore-water with low pH was generally associated with elevated concentrations of SO₄ and dissolved metals. Regions of differing pH were present within the test pile, indicating heterogeneous distribution of sulfide and carbonate minerals. Most probable number analysis showed that neutrophilic sulfur oxidizing bacteria were the most consistently prolific of populations associated with acid mine drainage at the time of deconstruction. The mineralogical evolution was examined through comparison of unweathered samples collected at the time of pile construction to weathered samples collected during the deconstruction phase. This analysis indicated that the C content of the waste rock was depleted, but the total S content of the waste rock remained relatively unchanged. Neutralization potential ratios calculated using C and total S indicate that regions of low paste pH (as low as 4.0) were generally consistent with the presence of material classified as potentially acid generating or of uncertain acid generating potential. The deconstruction study shows that variable conditions exist within the test pile (e.g., sharp changes in pH over a few meters) suggesting that waste-rock heterogeneity has influenced the geochemical evolution of the pore water within the test pile.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"181 ","pages":"Article 106293"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical characteristics of borehole cores and their indicative significance for gas hydrates in the permafrost area, Qinghai-Tibet Plateau","authors":"Yalong Zhou ,&nbsp;Shunyao Zhang ,&nbsp;Zhibin Yang ,&nbsp;Fugui Zhang","doi":"10.1016/j.apgeochem.2024.106223","DOIUrl":"10.1016/j.apgeochem.2024.106223","url":null,"abstract":"<div><div>The formation of gas hydrates in the permafrost zone of the Tibetan Plateau is complicated, so it is difficult to achieve significant breakthrough in gas hydrate exploration. In this paper, we compare the geochemical anomalies in different drill holes, with a view to elucidating their indicative roles in migration and accumulation of gas hydrate and hydrocarbon. The results demonstrate that the acidysis hydrocarbon and fluorescence spectra of the borehole in the discovered hydrate area show obvious enrichment characteristics, with significantly higher anomaly intensity than that in the borehole where no hydrate samples are found. The geochemical anomalies have obvious response characteristics with the cracks or fracture zones. The hydrocarbon genesis analysis indicates that the dominant cause is pyrolysis. The anomalies of acid hydrocarbon methane, methane carbon isotopes and fluorescence spectra can be used as indicators of natural gas hydrate and its transport and aggregation. The effective time and space configuration of the reservoir elements including gas source, migration and concentration, and permafrost conditions is crucial to the eventual formation of natural gas hydrate in the study region. The research can lay a foundation for future gas hydrate exploration in the Tibetan Plateau permafrost region.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"178 ","pages":"Article 106223"},"PeriodicalIF":3.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution of radionuclides in soils of drainage basin/cerrado biome and their relationship with the land occupation and use model","authors":"Hudson Moraes Rocha ,&nbsp;João Batista Pereira Cabral ,&nbsp;Fernanda Luisa Ramalho ,&nbsp;Assunção Andrade de Barcelos ,&nbsp;Patrícia da Silva Gomes ,&nbsp;Valter Antonio Becegato ,&nbsp;Alexandre Tadeu Paulino","doi":"10.1016/j.apgeochem.2024.106253","DOIUrl":"10.1016/j.apgeochem.2024.106253","url":null,"abstract":"<div><div>It is essential to know the level of radiation in the environment to develop and implement control programs to protect humans from exposure to high levels of contamination. As cerrado soils contain heavy metals and radionuclides in their composition due to agricultural activities, the objective of this study was to evaluate the concentrations and distributions of radionuclides such as potassium (⁴⁰K), uranium (²³⁸U), and thorium (²³²Th) in the soils of the cerrado biome of the Bonito River drainage basin, and their relationship with the land occupation and use model. Gamma-ray spectrometric measurements were performed at 38 sampling points in this study. The highest three concentrations of radionuclides were detected at points 14, 16 and 32 for ²³⁸U (209.03, 221.35 and 224.28 Bq kg⁻¹), at points 21, 20 and 32 for ²³²Th (133.53, 148.08 and 154.30 Bq kg⁻¹), and at points 8, 32 and 13 for ⁴⁰K (381.23, 470.75 and 698.93 Bq kg⁻¹). In the analysis of variance at 5% probability level for the factors of rock lithology and particle size of the soils, the concentrations and distributions of the radionuclides were significant. The first component of the principal component analysis (PCA), and the basic cations calcium (Ca²⁺), magnesium (Mg²⁺) and potassium (K⁺) showed high correlation. It indicates the importance of cationic macronutrients in plant nutrition. The results of this study proved to be valuable for explaining and understanding the presence and distribution of ⁴⁰K, ²³⁸U and ²³²Th in drainage basins on cerrado biomes in relation to the different natural and anthropogenic aspects of the landscape. In this sense, it was considered that clay-textured soils have higher chemical retention capacities of radioactive species. This could be useful for evaluating the radionuclide pollution in drainage basins of different regions around the world.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"179 ","pages":"Article 106253"},"PeriodicalIF":3.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 ThermoChimie database: Comparison with other databases and example calculations for radionuclides and chemo-toxic elements","authors":"E. Colàs ,&nbsp;J. Rodríguez-Mestres ,&nbsp;D. Pérez ,&nbsp;R. Mas ,&nbsp;P.F. dos Santos ,&nbsp;D. García ,&nbsp;L. Duro ,&nbsp;W. Bower ,&nbsp;S. Brassinnes ,&nbsp;B. Madé","doi":"10.1016/j.apgeochem.2024.106256","DOIUrl":"10.1016/j.apgeochem.2024.106256","url":null,"abstract":"<div><div>Results of a recent benchmarking exercise for the thermodynamic database ThermoChimie (<span><span>www.thermochimie-tdb.com</span><svg><path></path></svg></span>), focused on radionuclides and chemo-toxic elements, are described. This benchmarking is largely based on the comparison of calculated solubility and associated aqueous speciation in solutions representative of clay or cement porewaters. Those exercises help to check if the selected thermodynamic data are accurate and consistent and contribute to identify if all relevant aqueous species and solid phases are included in the database. The comparison has shown some specific cases for which estimations provide a useful tool to cover data gaps, especially those related to temperature effects. Also, it has highlighted that the possibility of improvement of some data sets is dependent on the availability of reliable and accurate experimental information.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"179 ","pages":"Article 106256"},"PeriodicalIF":3.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hindering the applicability of the authigenic 10Be/9Be dating by redeposition of mud in hybrid event beds, eastern Danube Basin, Slovakia","authors":"Michal Šujan ,&nbsp;Kishan Aherwar ,&nbsp;Katarína Šarinová ,&nbsp;Tomáš Vlček ,&nbsp;Andrej Chyba ,&nbsp;Natália Hudáčková ,&nbsp;Michal Jamrich ,&nbsp;Marianna Kováčová ,&nbsp;AsterTeam ,&nbsp;Orsolya Sztanó","doi":"10.1016/j.apgeochem.2024.106254","DOIUrl":"10.1016/j.apgeochem.2024.106254","url":null,"abstract":"<div><div>The authigenic ¹⁰Be/⁹Be dating method is a relatively new geochronological technique that shows great potential for use in epicontinental sedimentary successions, largely due to its ability to date ubiquitous mud. However, the factors influencing the applicability of this method are not yet fully understood, which limits its robust application. This study presents the first direct evidence that deep-water mud redeposition can lead to significantly older authigenic ¹⁰Be/⁹Be ages, with an offset of ca. 2 Myr in the studied example. The redeposition generated hybrid event beds (products of mixed gravity flows) on the Late Miocene basin floor of Lake Pannon. The source material for redeposition was the Middle Miocene successions exposed on the lake bottom, as indicated by reworked foraminiferal and calcareous nannoplankton fossils, as well as inorganic and organic geochemical proxies. This case study suggests that a thorough understanding of depositional processes and paleogeographic settings is essential when proposing future authigenic ¹⁰Be/⁹Be dating sampling strategies, to avoid the influence of deep-water mud redeposition by hybrid event beds. Additionally, a notable shift in geochemical signature was observed between syn- and post-rift phases. During the ca. 6 Myr-long rifting, sediment recycling and local provenance were dominant from the rifted basin margins, while the post-rift stage marked the onset of a regional-scale sediment routing system. Notably, organic matter preserved its compositional signature of the redeposited successions.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"179 ","pages":"Article 106254"},"PeriodicalIF":3.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 molecular composition of soil dissolved organic matter regulated by reactive mineral-associated organic matter under a broad range of climates","authors":"Yang Ding ,&nbsp;Zhenqing Shi","doi":"10.1016/j.apgeochem.2024.106261","DOIUrl":"10.1016/j.apgeochem.2024.106261","url":null,"abstract":"<div><div>Organic matter retained by reactive minerals constitutes an essential mechanism for long-term storage of carbon in soil, a process that is governed by climate factors. However, how the reactive mineral-associated organic matter affects the composition of soil dissolved organic matter (DOM) across a broad range of climates remains unclear. In this study, the contents of reactive minerals and their associated organic matter were determined by the chemical extraction method. Moreover, the effects of organic matter retained by reactive minerals on soil DOM composition were investigated at molecular level across a wide environmental gradient, by employing Fourier transform ion cyclotron resonance mass spectrometry, solid-state ¹³C nuclear magnetic resonance and statistical analyses. The results of FT-ICR-MS and correlation analyses indicated that the relative abundances of carbohydrates and proteins/amino sugars decreased, while the relative abundance of condensed aromatics increased with the increase of the content of organic matter retained by reactive minerals per unit mass (i.e., (OC)_RN) in soils. We highlighted that the adsorption and dissolution processes of DOM molecules, especially aromatic molecules, on reactive minerals played crucial roles in regulating the molecular composition of DOM in soil solution. Furthermore, (OC)_RN was controlled by climate-driven chemical weathering (e.g., precipitation). Our results imply that (OC)_RN is a key variable for regulating soil DOM composition under the impacts of climates, and can be used in developing prediction models for carbon cycling.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"179 ","pages":"Article 106261"},"PeriodicalIF":3.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}