Earth and Planetary Science Letters最新文献

{"title":"17Oexcess in Devils Hole calcite: an indicator of equilibrium fractionation and paleo moisture sources","authors":"Hagit P. Affek ,&nbsp;Eugeni Barkan ,&nbsp;Yael Tal ,&nbsp;Simon D. Steidle ,&nbsp;Kathleen A. Wendt ,&nbsp;Christoph Spötl ,&nbsp;R. Lawrence Edwards ,&nbsp;Ekaterina Fishman ,&nbsp;Yuri Dublyansky","doi":"10.1016/j.epsl.2025.119528","DOIUrl":"10.1016/j.epsl.2025.119528","url":null,"abstract":"<div><div>Paleo-hydrology is typically based on measurements of δ¹⁸O in carbonate archives of environments on land. Triple oxygen isotopes (given as ¹⁷O_excess = 10⁶ [ln (10^–3 δ¹⁷O + 1) – 0.528 ln (10^–3 δ¹⁸O + 1)] in CaCO₃ has been recently shown to record ¹⁷O_excess of the carbonate parent water, thus providing additional paleo-hydrology information. Paleo rain-water ¹⁷O_excess, as recorded in speleothems, may be indicative of changes in moisture source location and evaporative conditions. The link between water and carbonate ¹⁷O_excess, as characterized by the fractionation slope θ (= ln¹⁷α / ln¹⁸α), has been determined in fast growing synthetic and biogenic carbonates, and in a few vadose speleothems. Here, we use the very slow growing mammillary calcite of Devils Hole to examine the fractionation slope at equilibrium, and to assess hypotheses of pluvial glacial periods in the Great Basin (USA). Results suggests that the equilibrium fractionation slope is consistent with that of fast-growing carbonates. ¹⁷O_excess values in Devils Hole paleo water are indistinguishable between glacial and interglacial extremes, as well as through Terminations II and IV. These reconstructed ¹⁷O_excess values are also similar to that of modern Devils Hole water (45 per meg). We interpret the observed ¹⁷O_excess to reflect significant continental recycling of the moisture reaching the inland site of Devils Hole during interglacials, but much reduced recycling during glacials.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119528"},"PeriodicalIF":4.8,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563000","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":"Vapor Undersaturated Ultradepleted MORB Liquids in Plagioclase-hosted Melt Inclusions from Garrett Fracture Zone Lavas","authors":"Olivia G. Daynes ,&nbsp;Gokce K. Ustunisik ,&nbsp;Roger L. Nielsen ,&nbsp;Glenn A. Gaetani","doi":"10.1016/j.epsl.2025.119518","DOIUrl":"10.1016/j.epsl.2025.119518","url":null,"abstract":"<div><div>Melt inclusions (MI) entrapped in minerals that form at depth provide an opportunity to estimate relatively unmodified volatile concentrations in undegassed magmas. In this study, we report on the major, trace, and volatile element concentrations in plagioclase-hosted MI and compare those values to previously reported data from olivine-hosted MI and volcanic glasses erupted from the Garrett Fracture Zone (GFZ). Our new data were derived from two plagioclase ultraphyric basalt (PUB) samples, one of which contains two compositionally distinct populations of plagioclase-hosted MI. One population of MI is compositionally similar to olivine-hosted MI and the associated lavas from the same ridge segment. The other population of plagioclase-hosted MI in that sample is characterized by comparatively high MgO and Al₂O₃, extremely low incompatible trace element concentrations, and high CO₂ concentrations that are equivalent to minimum pressures of entrapment of 2-10 kbar. The major element compositions of those high-MgO plagioclase-hosted MI are similar to liquid compositions previously produced experimentally at 5-10 kbar. Few of the plagioclase-hosted MI in either of GFZ sample contain vapor bubbles – consistent with them being vapor undersaturated at the time of entrapment. Taken together, these observations imply that some of the MI represent the product of melting a depleted source that is either CO₂-rich or where CO₂ undersaturated magmas have scavenged a CO₂-rich component during transport from the melting regime to the surface.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119518"},"PeriodicalIF":4.8,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549409","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":"Depth-dependent azimuthal seismic anisotropy governed by Couette/Poiseuille flow partitioning in the asthenosphere","authors":"Zhirui Ray Wang ,&nbsp;Clinton P. Conrad ,&nbsp;Sergei Lebedev ,&nbsp;Giampiero Iaffaldano ,&nbsp;John R. Hopper","doi":"10.1016/j.epsl.2025.119527","DOIUrl":"10.1016/j.epsl.2025.119527","url":null,"abstract":"<div><div>Azimuthal seismic anisotropy provides crucial knowledge on spatial patterns of past and present upper mantle deformation. Origins of this deformation were traditionally tied to relative shear between surface plates and mantle, and in turn a constant orientation of anisotropy azimuths with depth. However, observations of azimuthal seismic anisotropy based on surface-wave tomography often feature depth-dependent azimuths in the upper mantle. This is consistent with the existence of low-viscosity, thin asthenosphere that facilitates the channelization of both plate-driven Couette flow and pressure-driven Poiseuille flow. If the two flows are not aligned, their combination yields depth rotations of asthenospheric shear, giving rise to depth dependence of azimuthal seismic anisotropy. In this study, we utilize publicly available azimuthal seismic anisotropy together with predictions from a global mantle flow model that incorporates Couette/Poiseuille flow. We find that Poiseuille flow has significant influence on depth rotations of seismically inferred azimuthal anisotropy. Depth rotations are prominent under the Atlantic basin and the Nazca plate, where modeled asthenospheric flow regimes are dominated by Poiseuille flow. Significant Poiseuille flow may exist beneath the Indian basin, but its depth rotations are small, probably because subduction zones to the north align Couette and Poiseuille flows into the same direction. Our results indicate that interpretation of azimuthal seismic anisotropy cannot be simply associated with relative shearing between plates and mantle. Instead, the relative importance of Couette and Poiseuille flows must be considered to account its depth dependence.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119527"},"PeriodicalIF":4.8,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534544","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":"Phanerozoic orbital-scale glacio-eustatic variability","authors":"Douwe G. van der Meer ,&nbsp;Lennert B. Stap ,&nbsp;Christopher R. Scotese ,&nbsp;Benjamin J.W. Mills ,&nbsp;Appy Sluijs ,&nbsp;Douwe J.J. van Hinsbergen","doi":"10.1016/j.epsl.2025.119526","DOIUrl":"10.1016/j.epsl.2025.119526","url":null,"abstract":"<div><div>Global Mean Sea Level, or eustasy, has a strong effect on depositional systems, biogeochemical cycles, and climate along continental margins. Long-term Phanerozoic Tectono-Glacio-Eustatic curves based on isotope geochemistry or plate reconstructions provide first-order trends but cannot resolve short-term (&lt;1 Myr) high amplitude ice volume-forced variability, that resulted in glacio-eustatic fluctuations of &gt;100 m during Paleozoic and Cenozoic icehouse times. These glacio-eustatic fluctuations were minor (∼20 – 40 m) to absent during Mesozoic greenhouse climates. We provide a continuous quantification of maximum amplitude short-term sea level change during the last 540 million years. We utilize a high-resolution Cenozoic climate model to estimate orbital-scale (10³-10⁵ years) temperature and ice volume variations as a function of long-term (≥ 1 Myr) changes in ice volume. Building upon a recent long-term ice volume reconstruction, we then calculate maximum feasible orbital-scale cyclicity for the entire Phanerozoic. Our estimates of sea level change during greenhouse climates are much lower than some estimates based on stratigraphically derived eustatic reconstructions. This suggests that these stratigraphic methods overestimate orbital-scale sea level change or that these were caused by other factors such as aquifer eustasy. Our analysis quantifies the range of glacio-eustatic sea level variability that may be used as independent constraint in future paleoclimatologic, paleogeographic, paleontologic, and paleoceanographic research.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119526"},"PeriodicalIF":4.8,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549411","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":"Closing the oceanic lithium budget by continental shelf sediment removal","authors":"Qingquan Hong ,&nbsp;Guang-Yi Wei ,&nbsp;Gaojun Li ,&nbsp;Yi-Bo Lin ,&nbsp;Feifei Zhang ,&nbsp;Shilei Li ,&nbsp;Chenglong Wang ,&nbsp;Zhimian Cao ,&nbsp;Pinghe Cai ,&nbsp;Tianyu Chen","doi":"10.1016/j.epsl.2025.119533","DOIUrl":"10.1016/j.epsl.2025.119533","url":null,"abstract":"<div><div>Seawater lithium isotopes (<em>δ</em>⁷Li_SW) are increasingly used as a proxy for continental silicate weathering and marine reverse weathering throughout Earth’s history. However, the mechanisms driving <em>δ</em>⁷Li_SW evolution remain uncertain, partly due to insufficient constraints on modern Li sources and sinks. Among these, sediment diagenesis has long been identified as an important Li sink, yet direct and quantitative evaluations of global authigenic Li sink remains limited. Here, we present porewater data to explore the controls on porewater Li distribution and to directly quantify Li removal and isotopic fractionation in shelf sediments. We find that Li removal associated with marine authigenic clay (MAAC) formation in shelf sediments is not limited by Si(OH)₄ because of its sufficient supply from the dissolution of terrigenous reactive aluminosilicates and biogenic silica. We show that irrigation-enhanced transport, coupled with active Li removal into authigenic clays in shelf sediments, result in a flux of 21±8 G mol year^-1, suggesting that Li removal associated with MAAC formation in shelf sediments is the dominant Li sink from seawater. We further constrain an isotopic fractionation (Δ_SW−MAAC=<em>δ</em>⁷Li_SW-<em>δ</em>⁷Li_MAAC) of 14.7–16.5 ‰ associated with this irrigation-enhanced shelf sediment sink. Our results highlight that authigenic Li removal into shelf sediments, complemented by a smaller contribution from seafloor basalt alteration, can closely balance the oceanic Li sources and have profound implications for understanding authigenic clay formation and Li cycle in the ancient ocean.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119533"},"PeriodicalIF":4.8,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549412","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":"Petrogenesis of cogenetic silica-undersaturated and -oversaturated rocks: Quantifying the role of crustal assimilation","authors":"Caroline R. Soderman ,&nbsp;Owen M. Weller ,&nbsp;Alex Copley ,&nbsp;Adrian A. Finch ,&nbsp;Charles D. Beard","doi":"10.1016/j.epsl.2025.119516","DOIUrl":"10.1016/j.epsl.2025.119516","url":null,"abstract":"<div><div>Crustal assimilation during fractional crystallisation is commonly proposed as a mechanism to generate evolved silica-oversaturated (i.e. quartz normative) rocks alongside cogenetic silica-undersaturated (i.e. feldspathoid normative) rocks. However, the amount of required assimilation, and the impact of varying crystallisation parameters (e.g. pressure, oxygen fugacity), remain poorly understood, despite a petrogenetic framework for these cogenetic rocks being necessary for understanding their varied magmatic critical metal enrichment. Here we apply new thermodynamic models to a case study of the Younger Giant Dyke Complex in south Greenland, a layered intrusive complex with cogenetic evolved silica-undersaturated and -oversaturated rocks, to explore quantitatively the role of these processes during fractionation and assimilation. A range of assimilation scenarios is explored, alongside thermal and isotopic perspectives on these scenarios. Our calculations show that a phase equilibria approach can tightly constrain assimilant amounts (e.g. 0–≤<!--> <!-->15% assimilation by mass of country rock granite in this complex), because of the narrow compositional range that divides silica-undersaturated from silica-oversaturated melts, whereas thermal and isotopic approaches may permit wider ranges of assimilation estimates because their model input parameters tend to be more variable. In general, silica-undersaturated primitive melts crystallising at more reduced conditions and/or higher pressures require more crustal assimilation to become silica-oversaturated. Consequently, the formation of evolved silica-undersaturated rocks is favoured when fractionation occurs at lower oxygen fugacity and higher pressures, because magmas are more protected from the effects of assimilation. Understanding such behaviour may be an important part of decoding why some alkaline-silicate complexes develop high concentrations of critical metals.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119516"},"PeriodicalIF":4.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522538","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":"Dynamics of Venusian rifts and their interactions with plumes and intrusions","authors":"Anna J.P. Gülcher ,&nbsp;Michael Gurnis ,&nbsp;Suzanne E. Smrekar","doi":"10.1016/j.epsl.2025.119514","DOIUrl":"10.1016/j.epsl.2025.119514","url":null,"abstract":"<div><div>The surface of Venus features extensive rift zones, known as chasmata, up to 10,000 km in length. Many of Venus' rifts exhibit intersecting branches, multiple troughs, and associations with coronae, which are often interpreted as small-scale mantle upwellings. With no Earth-like plate tectonics, the driving forces and rates of extension and lithospheric structure are poorly constrained. Here, we present the first 3D numerical models of rift tectonics under Venus-like conditions. We investigate the impact of crustal rheology (wet vs. dry diabase) and the thickness of the crust and lithosphere on rift geometry, topography, and surface fracturing. We further explore interactions between evolving rift structures and thermal upwellings (plumes) and magmatic intrusions – key components of Venus' global geodynamics. We find that rift morphology is highly sensitive to crustal rheology and lithospheric properties, with five modes of rift morphologies predicted: (1) narrow, (2) multiple, (3) wide-troughs, (4) wide-valley, and (5) branching; the multiple, wide-troughs, and branching modes align most closely with Venus observations. Underplated thermal plumes induce lower-crustal intrusions and cause localized lithospheric weakening, narrowing the rift regionally. Many coronae located within chasmata display arcuate trenches and may require alternative mechanisms or conditions to explain their rift morphology. Lateral offsets of rift valleys, branching from a single rift into multiple, and multiple parallel rift valleys are promoted by a relatively weak crust (wet diabase) or a strong crust (dry diabase) combined with a thin, warm lithosphere. If Venus' crust follows a dry diabase rheology, a significantly warm and thin lithosphere is required to reproduce observed rift characteristics. Some first-order differences in rift morphology across Venus may result from spatial or temporal variations in crustal and lithospheric properties.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119514"},"PeriodicalIF":4.8,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517001","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":"Enhanced deoxygenation and carbon storage in the mid-depth subarctic Pacific during the Bølling-Allerød","authors":"Qian Li ,&nbsp;Qingping Li ,&nbsp;Min-Te Chen ,&nbsp;Shouwei Zhou ,&nbsp;Jianjun Zou ,&nbsp;Xuefa Shi","doi":"10.1016/j.epsl.2025.119529","DOIUrl":"10.1016/j.epsl.2025.119529","url":null,"abstract":"<div><div>Reconstructing changes in ocean carbon reservoir is essential for understanding how oceans regulate atmospheric carbon dioxide (CO₂) fluctuations. It has been considered that large amounts of CO₂ were released from the deep subarctic Pacific during the Bølling-Allerød (BA). However, this is inconsistent with the slowing or pausing of atmospheric CO₂ rise throughout the BA. On this issue, an increase of carbon storage in the mid-depth subarctic Pacific is speculated, more geological reconstructions are needed to confirm it. Here, we present magnetofossils and redox-sensitive trace elements records from core LV63–41–2 retrieved from the mid-depth western subarctic Pacific to reconstruct the paleo-redox conditions and carbon storage changes spanning the last deglaciation. The significantly increased proportion of elongated magnetofossils and the enrichment of authigenic U are identified during the BA, consistently indicating lower oxygen concentration in the overlying bottom water and sediment pore water. This BA deoxygenation was widespread across mid-depth subarctic Pacific areas and could reflect increased respired dissolved inorganic carbon storage. Furthermore, the low-oxygen sedimentary environment would facilitate more organic carbon to be buried in sediments. The increases in respired carbon storage and organic carbon burial in the mid-depth subarctic Pacific might have slowed BA atmospheric CO₂ rise. This study highlights the significant application value of magnetofossils in reconstructing paleo-redox conditions in the subarctic Pacific and points out the important role of the mid-depth subarctic Pacific in regulating atmospheric CO₂ fluctuations.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119529"},"PeriodicalIF":4.8,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517348","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 evolution of a Mid-Miocene geomagnetic reversal","authors":"Liz van Grinsven ,&nbsp;Annemarieke Béguin ,&nbsp;Klaudia F. Kuiper ,&nbsp;Lennart V. de Groot","doi":"10.1016/j.epsl.2025.119464","DOIUrl":"10.1016/j.epsl.2025.119464","url":null,"abstract":"<div><div>The Earth’s magnetic field reverses its polarity non-periodically. Despite the large number of reversals in the magnetostratigraphic record, the geometry of the Earth’s magnetic field and the mechanisms driving reversals are still largely enigmatic. On the one hand, this is because the more readily available sedimentary records lack temporal resolution to record the rapid field changes during a reversal, and on the other hand because the volcanic data records -that may have the necessary temporal resolution- are dependent on volcanic eruption frequency and much more difficult to find. Here we produce a geomagnetic record with high temporal resolution that formed during the shield-building phase on Gran Canaria, Spain. Furthermore, we provide five radio-isotope age constraints for the section containing a mid-Miocene geomagnetic reversal. Our full-vector geomagnetic record is one of the most detailed records of a reversal to date. Surprisingly, we find that in the most reliable part of our record of the reversal the declination reverses only once, while the inclination flips at least five times. Lastly, we interpret this record as a combination of a geocentric axial dipole and non-axial dipole fields and show that the contributions of the non-axial dipole field can be relatively strong.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119464"},"PeriodicalIF":4.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501707","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":"Rapid thermal resetting of clumped isotope in coral aragonite","authors":"Yuhe Guo ,&nbsp;Yangrui Guo ,&nbsp;Wenfeng Deng ,&nbsp;Gangjian Wei","doi":"10.1016/j.epsl.2025.119519","DOIUrl":"10.1016/j.epsl.2025.119519","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Biogenic aragonite serves as a critical archive of geological signals, and its clumped isotope analysis can provide paleoenvironmental information. However, the thermal resetting of clumped isotope (Δ&lt;sub&gt;47&lt;/sub&gt;) presents a major challenge, especially in deep-time carbonate samples subjected to diagenetic alteration or burial heating. Laboratory heating experiments and kinetic modeling offer important insights into constraining the initial clumped isotope composition and thermal history of carbonates. Thermal resetting has been extensively studied in calcite, dolomite, and apatite. However, mineralogical phase transitions during heating, and the resulting multiphase mixtures complicate the fitting of heating experiment data to thermally reset kinetic models for aragonite. Here, we present heating experiments designed to evaluate the thermal resetting kinetic parameters of aragonite prior to phase transitions. We treated coral aragonite materials in three forms—fragmented, powdered, and oxidized and heat them at 120–240 °C—to evaluate the role of different types of internal water on thermal resetting. We observed a rapid decrease in the Δ&lt;sub&gt;47&lt;/sub&gt; values of aragonite during the initial stage of the experimental heating, which slowed significantly around 40 min. Meanwhile, we observed a decrease in oxygen isotope values during heating suggesting the isotopic exchanges between the internal water and the solid carbonate. We observed no significant difference in the thermal resetting rates between fragmented coral and powdered coral; however, oxidized coral thermal resetting rate exhibited limited acceleration compared to the other two sample types. We infer that the limited accelerated thermal resetting rate in oxidized aragonite may be due to the partial removal of organic matter during oxidative pretreatment, which increases the surface-to-volume ratio, facilitating the migration of internal water—potentially sourced from nanoscale organic-associated water or structural water—through newly formed microfractures and microchannels. The thermal resetting kinetic parameters of coral aragonite were derived by fitting the heating data to the disordered kinetic model. The mean activation energy (μ&lt;sub&gt;E&lt;/sub&gt;) is 132.0 ± 12.4 kJ mol⁻¹, the activation energy distribution width (σ&lt;sub&gt;E&lt;/sub&gt;) is 10.9 ± 0.7 kJ mol⁻¹, and the pre-exponential factor (ν&lt;sub&gt;0&lt;/sub&gt;) is 30.5 ± 3.6 min⁻¹. To better understand the long-term behavior, we simulated the thermal history of coral aragonite across a temperature range of 20–200 °C. The simulations indicate that, at temperatures above 100 °C, the Δ&lt;sub&gt;47&lt;/sub&gt; values of coral aragonite reach complete equilibrium within one year. Meanwhile, below 50 °C, the clumped isotope signal of coral aragonite is susceptible to alteration. These results suggest that the use of coral aragonite clumped isotopes in deep-time studies should be approached with caution. However, coral aragonite’s high sensitivity to therma","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"667 ","pages":"Article 119519"},"PeriodicalIF":4.8,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501706","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}