Depositional Record最新文献

{"title":"Provenance of Middle Triassic sediments in the Southern Youjiang Basin: Insights from detrital zircon geochronology and tourmaline geochemistry","authors":"Yumei Wei,&nbsp;Lanqiu Meng,&nbsp;Yu Zhang","doi":"10.1002/dep2.70082","DOIUrl":"https://doi.org/10.1002/dep2.70082","url":null,"abstract":"<p>The sedimentary provenance and tectonic setting of the Youjiang Basin in southwestern China remain debated, particularly regarding the relative contributions of the Indochina Block and the southeastern margin of the South China Block (SCB) during the Indosinian Orogeny. This study integrates detrital zircon U–Pb geochronology and tourmaline geochemistry from Middle Triassic turbidites of the Baifeng Formation to constrain sediment provenance and tectonic evolution during the Indosinian Orogeny. A total of 189 concordant zircon ages reveal four major age populations at 2100–1500 Ma, 1200–730 Ma, 570–410 Ma and 375–234 Ma, accounting for approximately 85% of the concordant zircon population. The coexistence of abundant Late Palaeozoic–Early Mesozoic zircons with substantial Neoproterozoic and Early Palaeozoic components suggests input from a source region characterised by both Late Palaeozoic–Early Mesozoic arc-related magmatism and older continental crust. Tourmaline compositions further indicate source contributions from Li-poor granitoids, pegmatites, alaskites and metasedimentary rocks. Zircon CA–DA characteristics indicate significant input from relatively young magmatic sources, consistent with sediment generation in a convergent continental-margin setting. Integrated provenance evidence suggests that the Middle Triassic Baifeng Formation sediments were predominantly derived from a Late Palaeozoic–Early Mesozoic continental arc along the southeastern margin of the SCB. These results provide new constraints on sediment dispersal patterns and tectonic evolution of South China during the Indosinian Orogeny and highlight the role of Paleo-Pacific-related continental arc processes in basin development.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70082","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848836","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":"Reply to Comment by John J.G. Reijmer, Arnoud Slootman & Max de Kruijf on Baas, J.H., Hewitt, W., Lokier, S. and Hendry, J. (2025) Coming to light: How effective are sediment gravity flows in removing fine suspended carbonate from reefs? The Depositional Record, 11, 583–598. DOI: 10.1002/dep2.319","authors":"Jaco H. Baas,&nbsp;Stephen Lokier,&nbsp;James Hendry","doi":"10.1002/dep2.70080","DOIUrl":"https://doi.org/10.1002/dep2.70080","url":null,"abstract":"&lt;p&gt;We welcome the comment by Reijmer et al. (&lt;span&gt;2026&lt;/span&gt;) on our experimental investigations of the dynamical behaviour, that is, the mobility, of gravity flows laden with mud-grade calcite and its comparison with cohesive and non-cohesive siliciclastic equivalents (Baas et al., &lt;span&gt;2025&lt;/span&gt;). We provided evidence that the mud-grade calcite flows were similar to highly mobile physically non-cohesive silt-sized silica flour flows, therefore suggesting that the crushed limestone used in the experiments is also physically non-cohesive, or, at least, much less cohesive than kaolinite and bentonite-laden gravity flows. Based on these results, Baas et al. (&lt;span&gt;2025&lt;/span&gt;) suggested that mud-grade calciclastic gravity flows aid the removal of fine suspended sediment from coral reefs, especially from reef front and forereef settings. Reijmer et al. (&lt;span&gt;2026&lt;/span&gt;) structured their comment around the experimental approach and selection of powdered calcite, and the potential threat of carbonate mud to coral reef health.&lt;/p&gt;&lt;p&gt;As expressed in multiple sections in Baas et al. (&lt;span&gt;2025&lt;/span&gt;), our experiments were conducted as a necessary first step towards a more detailed systematic understanding of intrinsically more complex carbonate-laden gravity flows in nature. Baas et al. (&lt;span&gt;2025&lt;/span&gt;) thus used a reductionistic, or bottom-up, approach by aiming to understand one variable at a time, here focussed on the basic question: Is mud-grade calcite cohesive or not? Reijmer et al. (&lt;span&gt;2026&lt;/span&gt;) are, of course, correct in stating that naturally occurring carbonate grains are highly variable in size, shape, texture and density, that the properties of carbonate mud depend on the mode of formation, and that biological cohesion, typically caused by extracellular polymeric substances (EPS), can play a crucial role in erosion and transport of mud-grade carbonate. All these aspects were an integral part of the aims of Baas et al. (&lt;span&gt;2025&lt;/span&gt;, page 585) and discussed in our Section 5. We did not state that the mud used in the experiments is a direct analogue for natural mud, and we welcome the additional information on carbonate mud production and properties provided by Reijmer et al. (&lt;span&gt;2026&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;Reijmer et al. (&lt;span&gt;2026&lt;/span&gt;) appear to favour a holistic, or top-down, approach related to their first comment on whether the mud used in the experiments is a fitting analogue for natural mud. This holism is also reflected in recent papers (Reijmer et al., &lt;span&gt;2025&lt;/span&gt;; Slootman et al., &lt;span&gt;2026a&lt;/span&gt;, &lt;span&gt;2026b&lt;/span&gt;), in which natural cohesive and non-cohesive carbonate sediment was used, and data analysis involved determining relative contributions of different variables. This is a well-established approach, but with limitations in terms of reconstructing individual contributions and complex interactions of variables, and the wider relevance beyond the specific carbonate system examples from which the s","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752851","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":"AI-assisted identification of stromatoporoids","authors":"David Rodríguez González,&nbsp;Consuelo Sendino,&nbsp;Stephen Kershaw,&nbsp;Inés Victoria Rodríguez","doi":"10.1002/dep2.70079","DOIUrl":"https://doi.org/10.1002/dep2.70079","url":null,"abstract":"<p>Stromatoporoid sponge fossils were major diverse reef-builders in the Palaeozoic Era; their taxonomic identification relies on thin sections examined under transmitted light microscopy, where vertical and transverse skeletal elements reveal diagnostic architectural features that vary with taxa. These elements typically appear darker than the cement-filled internal spaces, allowing stromatoporoid taxa to be distinguished. However, stromatoporoid architecture is variable so that judgement of identification is not always unequivocal. Therefore, this study investigates the application of artificial intelligence (AI) to automate stromatoporoid identification, introducing a novel approach to streamline and standardise palaeontological taxonomy. For the first time, both vertical and transverse sections have been simultaneously analysed and integrated into an automated framework. High-resolution images of thin sections from four well-established Silurian genera, collected from the West Midlands and Shropshire counties, UK, were used to train supervised machine learning models. The images, captured using plane-polarised transmitted light microscopy on thin sections, were digitally enhanced to increase contrast and eliminate background noise, ensuring that only skeletal features were used to inform the models. Despite variations in fossil preservation, section orientation and image quality, the AI models achieved classification accuracies of up to 96%. This demonstrates that stromatoporoid skeletal architecture is highly amenable to automated analysis, even under suboptimal conditions. The results represent a significant step forward in the application of AI to palaeontology, reducing reliance on manual identification and accelerating the classification process. Ultimately, this approach provides a new quantitative framework for evaluating stromatoporoid skeletal architecture, strengthening the scientific basis of their taxonomic interpretation and opening new avenues for analysing morphological diversity in hypercalcified sponges.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752493","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":"Multi-proxy sequence stratigraphy of a mixed carbonate–siliciclastic shelf across the Jurassic–Cretaceous transition","authors":"Hamdi Omar,&nbsp;Adnene Lafi,&nbsp;Chokri Yaich","doi":"10.1002/dep2.70078","DOIUrl":"https://doi.org/10.1002/dep2.70078","url":null,"abstract":"<p>Relative sea-level change, climate variability and sediment supply exert a first-order control on the architecture of mixed carbonate–siliciclastic shelves, yet their combined expression in fine-grained successions with low facies diversity remains difficult to resolve. The Tithonian–Berriasian succession of central Tunisia provides a natural laboratory to address three questions: how many third-order sequences can be distinguished in a clay-rich mixed system; how reliably sequence boundaries and maximum flooding surfaces can be located using an integrated proxy set; and how these surfaces relate to regional tectonics and long-term eustatic trends. Five sections along a ~93 km shelf-to-basin transect were logged at decimetre scale and analysed using facies and facies-association analysis, systematic documentation of discontinuity surfaces, magnetic susceptibility measured selectively in marl–clay intervals, bulk CaCO₃ content and XRF-derived elemental ratios that track detrital input and carbonate productivity. These new data are combined with published palynofacies, clay mineralogy and macrofaunal information. The resulting framework resolves five Tithonian and eight Berriasian third-order sequences, each constrained by consistent shifts in facies stacking, the distribution and character of condensed surfaces, firmgrounds and hardgrounds, systematic changes in susceptibility and Ti-, Zr- and Ca-based geochemical ratios and associated changes in biotic assemblages. Correlation across the transect reveals an overall regressive trend overprinted by higher-frequency transgressive–regressive cycles, with local departures linked to differential subsidence along the North–South structural axis. The results show that integrated sedimentological, geophysical and geochemical methods can recover high-resolution sequence architecture from monotonous mixed successions, provide a reference shelf model for the southern Tethyan margin during the Tithonian–Berriasian and offer a transferable template for inter-basinal correlation of sea-level and climate signals in comparable carbonate–siliciclastic systems.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534142","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":"A comparative study of low-temperature carbonate formation on natural exopolymers from hypersaline microbial mats and clay minerals","authors":"Zach A. Diloreto,&nbsp;Xiancai Lu,&nbsp;Huan Liu,&nbsp;Tomaso R. R. Bontognali,&nbsp;Hamad Al-Saad Al-Kuwari,&nbsp;Fadhil Sadooni,&nbsp;Maria Dittrich","doi":"10.1002/dep2.70065","DOIUrl":"https://doi.org/10.1002/dep2.70065","url":null,"abstract":"<p>Fluctuations in the abundance of low-temperature (T) dolomite have occurred throughout geologic time and have been linked to changes in hydrothermal activity, sea level and burial of organic matter suggesting ties to the global biogeochemical cycle of carbon. However, low-T dolomite remains an enigmatic mineral due to poorly understood controls on its formation. Recent studies have suggested that both biotic and abiotic nucleation surfaces, such as extracellular polymeric substances (EPS) and clays, play an important role in formation. Despite both abiotic and biotic factors having been demonstrated to trigger the formation of low-T dolomite, comparative studies are lacking. Moreover, the exact mechanisms occurring in the presence of EPS, clays and silica need to be clarified. Thus, this study focused on isolating and characterising EPS from hypersaline sabkhas, a known locale for primary dolomite, as well as clay minerals, and using these materials as reactive surfaces to induce precipitation. Within this study, carbonaceous precipitates formed and were subsequently subjected to high-resolution analysis including Raman spectroscopy and Near Edge X-ray Absorption Fine Structure (NEXAFS) to characterise their structure and interaction with specific nucleation sites. The data collected during these experiments has shown that carbonates preferentially nucleate on EPS and most likely on carboxylic functional groups. Additionally, the data show that EPS and clays by themselves may be inadequate to facilitate precipitation. Other factors such as solution chemistry, dissolved Si concentration, as well as organic material and the associated functional groups play a critical role in low-T dolomite formation. It was also observed that too much organic material could play an inhibitory role. The confirmation of preferential nucleation of carbonates on carboxylic groups lends credence to the currently proposed organomineralisation model of low-T dolomite precipitation. Furthermore, the data highlight the critical importance of environmental dynamics and their interpretation in the global biogeochemical cycle of carbon.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324354","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":"Comment on Baas, J.H., Hewitt, W., Lokier, S. and Hendry, J. (2025) Coming to light: How effective are sediment gravity flows in removing fine suspended carbonate from reefs? The Depositional Record, 11, 583–598. doi: 10.1002/dep2.319","authors":"John J. G. Reijmer,&nbsp;Arnoud Slootman,&nbsp;Max de Kruijf","doi":"10.1002/dep2.70076","DOIUrl":"https://doi.org/10.1002/dep2.70076","url":null,"abstract":"<p>Gravity flows are important agents of sediment transport in both siliciclastic and carbonate submarine sedimentary systems throughout geological time as well as today (e.g. Schlager et al., <span>1994</span>; Talling et al., <span>2015</span> and references therein). In carbonate settings, sediment production not only varies over time but also depends on the type of carbonate factory, for example tropical, cool-water, microbial, pelagic (e.g. Reijmer, <span>2021</span>). Understanding the sediment production in these systems therefore is an essential prerequisite as it influences the type of sediment transport through gravity flows.</p><p>In summary, (i) the use of crushed limestone mud (calcite) introduces a significant source of uncertainty in the experiments of Baas et al. (<span>2025</span>). Sediment properties, including size, shape, texture, density and mineralogy, differ fundamentally from those of natural carbonate muds. As a result, the cohesive behaviour and settling dynamics also diverge markedly from those of the siliciclastic muds to which the mud-grade calcite experiments are compared. This difference includes both the dissimilarities in (non-)skeletal mud content as well as shear strength. (ii) The claim that carbonate mud represents a threat to reef development, and that its export out of the reefs at the platform margin, or from within the reefs themselves, is essential for reef survival is not supported by an extensive body of facies-based studies from present-day carbonate platforms, shelves, atolls and patch reefs.</p><p>Future flume-tank experiments should therefore be grounded in a rigorous evaluation of sediment composition and settling behaviour for both mud and sand fractions. Given their intrinsic diversity, carbonate sediments cannot be adequately replaced by a single non-natural analogue.</p><p>The data that support the findings of this study are available from the corresponding author upon reasonable request.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237521","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":"Quantification of the Eocene–Oligocene transition in the Zagros Foreland Basin: Palaeogeographic control on sequence architecture and tectonic signal preservation","authors":"Sahar Rokni,&nbsp;Vahid Ahmadi,&nbsp;Seyed Hamid Vaziri,&nbsp;Ali Aghanabati,&nbsp;Pooria Kianoush","doi":"10.1002/dep2.70077","DOIUrl":"https://doi.org/10.1002/dep2.70077","url":null,"abstract":"<p>The Eocene–Oligocene boundary was a period of major global climatic and tectonic change, yet its expression in the Zagros Foreland Basin remains controversial due to complex facies relationships and the overprint of the Pyrenean orogenic phase. This study aims to resolve this stratigraphic enigma across three key sections using an integrated multi-proxy approach combining biostratigraphy, geochemistry and mineralogy from 670 thin sections and 30 geochemical samples. The multi-proxy approach provides independent, cross-validated lines of evidence for interpreting depositional environments and sequence boundaries, moving beyond correlation based on lithostratigraphy alone. Results delineate two distinct boundary expressions. In the interior Fars, an erosional unconformity separates the Lutetian <i>Orbitolites complanatus</i>-<i>Coskinolina roberti</i>-<i>Rhapydionina liburnica</i> zone of the Jahrum Formation from the Rupelian <i>Nummulites vascus</i>-<i>N. fichteli</i> zone of the Asmari Formation. In coastal Fars, a continuous transition is marked by the Late Eocene <i>Turborotalia cerroazulensis</i>-<i>Hantkenina</i> zone of the Pabdeh Formation grading into the Rupelian Asmari. Geochemical data validate these models: the Pabdeh Formation shows high CaO and Sr. with low Al₂O₃, indicating a pelagic setting, while the Jahrum Formation has higher terrigenous proxies. SEM-EDS confirms syngenetic dolomitisation in the interior platform and pyrite framboids in the basinal Pabdeh, indicating anoxia. A Monte Carlo sensitivity analysis confirms 97.3% confidence for the unconformity and 89.4% for the conformable interpretation. This work quantitatively demonstrates that a paleobathymetric gradient was the dominant control on sequence architecture, effectively neutralising the Pyrenean tectonic signal in deeper basinal settings. This framework provides a predictive model for stratigraphic correlation in foreland basins globally.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174560","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":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148064472","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":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148064938","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":"Mg isotope fractionation during microbial dolomite formation in the Khor Al-Adaid sabkha, Qatar","authors":"Michael Tatzel,&nbsp;Adina Paytan,&nbsp;Samantha Carter,&nbsp;Daniel A. Frick,&nbsp;Marcus Oelze,&nbsp;Francisca Martinez-Ruiz,&nbsp;Zach A. DiLoreto,&nbsp;Elizabeth M. Griffith,&nbsp;Maria Dittrich,&nbsp;Tomaso R. R. Bontognali,&nbsp;Mónica Sánchez-Román","doi":"10.1002/dep2.70072","DOIUrl":"https://doi.org/10.1002/dep2.70072","url":null,"abstract":"<p>The processes governing dolomite [CaMg(CO₃)₂] formation remain among the most debated topics in sedimentary geology. Although primary dolomite can precipitate at low temperatures in certain modern environments, its scarcity today contrasts sharply with its abundance in ancient rocks—a discrepancy known as the ‘dolomite problem’. Dolomite typically forms through two pathways: (1) primary precipitation during early diagenesis, often influenced by microbial activity and organic matter and (2) secondary replacement of preexisting carbonates during burial at higher temperatures. In this study, we investigate Mg isotope fractionation in a modern sabkha in southern Qatar to evaluate its potential as a tracer of dolomite formation processes. We analysed δ²⁶Mg and δ⁴⁴Ca in surface- and pore waters, authigenic clays and organic- and leached dolomite-containing fractions. Ca isotopes reveal an ~1‰ fractionation between pore water–organic matter and dolomite, consistent with a two-step, biologically mediated formation pathway. Contrary, only minor ²⁶Mg enrichment in the organic fraction relative to pore water suggests that Mg isotopes alone provide limited evidence for such microbial mediation. Dolomite δ²⁶Mg values (~−2.15‰) align with predictions for temperature-dependent inorganic precipitation. Overall, the results indicate that microbial activity probably influences dolomite formation indirectly by altering local water chemistry rather than having a distinct Mg isotopic fractionation. These findings refine the application of Mg isotopes as proxies for dolomite genesis and offer new insights into carbonate diagenesis in saline environments.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"12 2","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.70072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715119","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}