{"title":"Correction to: Magma generation processes for large, zoned ignimbrites of Aso volcano, SW Japan: insights from geochemical variation of melt inclusions and groundmass","authors":"Ryohei Kikuchi, Katsuya Kaneko, Olivier Bachmann","doi":"10.1007/s00410-025-02264-y","DOIUrl":"10.1007/s00410-025-02264-y","url":null,"abstract":"","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Théo Biget, Emilie Bruand, Inês Pereira, Maud Boyet, Deta Gasser, Kurt Stüwe, Antonio Langone
{"title":"Correction: The chemical and Sm–Nd isotopic behaviour of accessory minerals in metasediments along the LP-HT Chugach Metamorphic Complex (Alaska)","authors":"Théo Biget, Emilie Bruand, Inês Pereira, Maud Boyet, Deta Gasser, Kurt Stüwe, Antonio Langone","doi":"10.1007/s00410-025-02261-1","DOIUrl":"10.1007/s00410-025-02261-1","url":null,"abstract":"","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02261-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. G. Sokol, A. A. Tomilenko, T. A. Bul’bak, A. N. Kruk
{"title":"Stability of ammonia in C-O-H-N fluids at 3.0-7.8 GPa and 750–1100 °C: implications for the efficiency of nitrogen flux into the mantle","authors":"A. G. Sokol, A. A. Tomilenko, T. A. Bul’bak, A. N. Kruk","doi":"10.1007/s00410-025-02259-9","DOIUrl":"10.1007/s00410-025-02259-9","url":null,"abstract":"<div><p>The knowledge of Nitrogen speciation in the C-O-H-N fluid phase has important implications for the efficiency of Nitrogen flux and recycling in the mantle. The composition of nitrogen-rich C-O-H-N fluids is studied experimentally at pressures from 3.0 to 7.8 GPa, temperatures from 750 to 1090°С, and oxygen fugacity (<i>f</i>O<sub>2</sub>) at the iron-wȕstite (IW) to fayalite-magnetite-quartz (FMQ) buffers simulating the conditions of a slab subducted to mantle depths from 100 to 250 km. Gas chromatography-mass spectrometry of the experimental quenched fluids reveals ammonia (NH<sub>3</sub>), N<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, CH<sub>4</sub>, as well as minor amounts of light alkanes and oxygen-bearing organics, while the NH<sub>3</sub>/(N<sub>2</sub> + NH<sub>3</sub>) ratio ranges from 0.01 to 0.97. Most of the experimental C-O-H-N fluids contain low fractions of NH<sub>3</sub> (≤ 0.12), while higher values are possible only at very low <i>f</i>O<sub>2</sub> unrealistic for subduction zones at depths < 250 km. A semi-empirical model, with the equilibrium constant K*(K*=<span>(:{X}_{{NH}_{3}}^{2})</span>/<span>(:{X}_{{N}_{2}})</span>), is suggested to predict nitrogen speciation for a sediment-derived mobile phase with reduced H<sub>2</sub>O contents for typical <i>P-T</i>-<i>f</i>O<sub>2</sub> ranges. As inferred previously, the fraction of NH<sub>3</sub> can exceed the N<sub>2</sub> fraction (<span>(:{X}_{{NH}_{3}}^{})</span>/<span>(:{X}_{{N}_{2}})</span> >1) only in diluted aqueous fluids generated at temperatures of warm subduction and at a pressure of ~3.0 GPa, but it remains negligible in the hot subduction conditions. The transformation of the aqueous fluid into a supercritical fluid-melt (with reduced H<sub>2</sub>O fraction) in warm or hot slabs subducted to depths equivalent to <i>P</i>≥3.5-5.5 GPa, is demonstrated to decrease significantly the fraction of NH<sub>3</sub> in the mobile phase, the redox conditions being invariable. In general, the aqueous fluid-to-SCFM transformation is expected to reduce the concentrations of nitrogen species compatible with phengite. Correspondingly, the coefficient of nitrogen partitioning between the mobile phase and phengite becomes lower with increasing pressure, which reduces the flux of nitrogen carried by both warm and hot slabs to depths >150 km.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joseph P. Gonzalez, Mattia L. Mazzucchelli, Jay B. Thomas, Ross J. Angel, Robert S. Darling, Khi X. Atchinson, Mattia Gilio, Matteo Alvaro
{"title":"Elastic thermobarometry of natural and experimental quartz inclusions in garnet (QuiG) under tension","authors":"Joseph P. Gonzalez, Mattia L. Mazzucchelli, Jay B. Thomas, Ross J. Angel, Robert S. Darling, Khi X. Atchinson, Mattia Gilio, Matteo Alvaro","doi":"10.1007/s00410-025-02252-2","DOIUrl":"10.1007/s00410-025-02252-2","url":null,"abstract":"<div><p>Elastic thermobarometry has been rarely applied to quartz inclusions entrapped in garnet (QuiG) in granulite and igneous terranes, in part, because there is uncertainty about the reliability of the thermobarometric results arising from the quartz inclusions being subject to tensile strain and stress when examined at room conditions. Here, we present QuiG results from high-temperature metapelites from the Adirondacks, NY, USA and piston-cylinder experiments that give insight into the deformation behavior of quartz inclusions under tension. Measured remnant pressures (P<sub>inc</sub>) of experimental and natural samples calculated using the quartz phonon mode Grüneisen tensor are too tensile with respect to the expected P<sub>inc</sub> values based on experimental and petrologic constraints. We show that these discrepancies are not related to non-elastic deformation nor inaccuracies in the quartz equation of state. Evaluation of previous density functional theory (DFT) results shows that the structural response of quartz is non-linear with increasing tensile strain. Therefore, because the available quartz phonon mode Grüneisen tensor was determined with a linear fit optimized for compressive strains, obtained tensile strains using this tensor are too large in magnitude. P<sub>inc</sub> values obtained using the hydrostatic calibrations of the 128 and 464 cm<sup>−1</sup> peaks have better agreement with the expected values and return entrapment conditions that are consistent with petrologically constrained or known experimental pressures. P<sub>inc</sub> values obtained through hydrostatic calibrations must nonetheless be treated with caution because the behavior of Raman phonon modes under tension has not been calibrated experimentally.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02252-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antoine Godet, Carl Guilmette, Matthijs Smit, Victoria Maneta, François Fournier-Roy, Kira Musiyachenko
{"title":"Correction: Insights into garnet growth in S-type granite from Lu–Hf dating and trace element mapping","authors":"Antoine Godet, Carl Guilmette, Matthijs Smit, Victoria Maneta, François Fournier-Roy, Kira Musiyachenko","doi":"10.1007/s00410-025-02245-1","DOIUrl":"10.1007/s00410-025-02245-1","url":null,"abstract":"","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02245-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karen V. Smit, Michael U. Gress, Gareth R. Davies, Janne M. Koornneef, Ingrid L. Chinn
{"title":"Plume-related diamond formation in reworked Archaean mantle: Sm–Nd age constraints from Voorspoed peridotitic and eclogitic diamonds (Kaapvaal Craton)","authors":"Karen V. Smit, Michael U. Gress, Gareth R. Davies, Janne M. Koornneef, Ingrid L. Chinn","doi":"10.1007/s00410-025-02258-w","DOIUrl":"10.1007/s00410-025-02258-w","url":null,"abstract":"<div><p>Here we study silicate inclusion-bearing diamonds from the Voorspoed Group II kimberlite (or carbonate-rich olivine lamproite—CROL) in the central Kaapvaal Craton. Based on major and trace elements, along with Sm–Nd isotope characteristics, the <b><i>peridotitic</i></b> garnet and clinopyroxene inclusions define three compositional groups that are contemporaneous with lithospheric refertilisation and re-healing related to 2.79–2.68 Ga Ventersdorp-related plume magmatism across the central Kaapvaal craton. Three harzburgitic (G10) inclusions define an isochron of 2877 ± 249 Ma, with a low initial ε<sub>Nd</sub> = − 15 ± 10 that overlaps the oldest Kaapvaal enriched components as represented by crust in the 3.66–3.22 Ga Ancient Gneiss Complex. This finding suggests that harzburgitic diamond formation occurred in the oldest > 3.2 Ga Kaapvaal lithospheric mantle. Five lherzolitic (G9) garnet and 11 Cr-diopside inclusions with La<sub>N</sub> > 1 (where N refers to chondrite normalisation) and low <sup>147</sup>Sm/<sup>144</sup>Nd (0.11–0.41), define a 2606 ± 95 Ma Sm–Nd isochron with an initial ε<sub>Nd</sub> = − 6.9 ± 5.4 that is consistent with diamond formation in enriched > 3.0 Ga lithospheric mantle. Four lherzolitic (G9) garnet and five Cr-diopside inclusions with La<sub>N</sub> < 1 and higher <sup>147</sup>Sm/<sup>144</sup>Nd (0.45–1.51), define a 2560 ± 51 Ma Sm–Nd isochron with an initial ε<sub>Nd</sub> = 9.8 ± 7.8. This initial ratio overlaps with depleted mantle indicating rapid re-healing of the lithospheric mantle after 2.79–2.68 Ga Ventersdorp-related plume magmatism. Sixteen <b><i>eclogitic</i></b> inclusions (10 garnets and six omphacites) define an isochron of 2196 ± 61 Ma, with initial ε<sub>Nd</sub> = − 9.3 ± 3.9. Growth of Voorspoed eclogitic diamonds is interpreted to be related to magmatism and failed rifting at the time of the 2.25–2.23 Ga Hekpoort LIP and associated magmatism across the Transvaal Basin. Low-pressure protoliths for the eclogite host rocks are supported by the presence of omphacite that is not stable as a high-pressure liquidus phase, along with Eu anomalies in the majority of eclogitic inclusions. The likely host rocks for eclogitic diamond formation are subduction-related eclogites in the lithospheric mantle that may be similar to those sampled nearby at Lace. The Voorspoed peridotitic and eclogitic diamonds document multiple episodes of melt infiltration and modification of older lithospheric mantle, and have allowed us to place diamond formation and preservation in the context of the long history of plume impingement on the Kaapvaal lithospheric mantle.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02258-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yujin Jegal, Teresa Ubide, María José Huertas, Raquel Herrera, Álvaro Márquez, Eumenio Ancochea, Juan Jesús Coello-Bravo
{"title":"Plagioclase antecrysts record syn-eruptive incorporation of evolved mush during the 2021 Tajogaite eruption (La Palma, Spain)","authors":"Yujin Jegal, Teresa Ubide, María José Huertas, Raquel Herrera, Álvaro Márquez, Eumenio Ancochea, Juan Jesús Coello-Bravo","doi":"10.1007/s00410-025-02241-5","DOIUrl":"10.1007/s00410-025-02241-5","url":null,"abstract":"<div><p>Magma mixing in mush zones constitutes a common eruption trigger and modulates the composition of erupted lavas and their hazard potential. Plagioclase is an excellent archive of mixing processes, however in ocean island basalts, the mineral crystallizes late and is typically restricted to matrix microcrysts. The 2021 Tajogaite eruption (La Palma, Canary Islands) included rare macrocrysts of plagioclase with disequilibrium textures that afford investigation of mush interactions during volcanism. The 85-day-long eruption produced initial clinopyroxene-amphibole-bearing tephrites followed by dominant clinopyroxene-olivine-rich basanites. From days 13–35, some basanite lavas contained macrocrysts of plagioclase with strong compositional contrasts between cores (evolved andesine antecrysts; An<sub>22–52</sub>) and rims (labradorite; An<sub>50–64</sub>). The An-rich rims are chemically similar to microcrysts in the matrix (labradorite; An<sub>54–66</sub>), cogenetic with the erupted basanite liquid. Trace element compositions change abruptly between antecryst cores (3352–5139 ppm Sr) and rims and matrix microlites (1624–3097 ppm Sr). <sup>87</sup>Sr/<sup>86</sup>Sr ratios are similar for antecryst cores and rims (0.70313–0.70322), more radiogenic than the host matrix (0.70308–0.70314) in several samples. Such contrasts suggest recycling of distinctly evolved, Sr-radiogenic plagioclase-bearing mush by recharging basanite magma prior to, or during the eruption, as new inputs of basanite melt led to eruption of more fluidal and rapid lavas. Evolved plagioclase compositions have been reported in tephriphonolites from previous eruptions, interpreted to form in magma accumulation zones in the lower oceanic crust beneath La Palma. Our work provides new evidence of evolved magma mush developing upon ponding of basanite melts around Moho depths below ocean island basalts.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02241-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Kimberlite-borne garnet xenocrysts reveal complex lithospheric structure between intact and destroyed parts of the North China Craton","authors":"Wei-Xian Liu, Hong-Kun Dai, Qing Xiong, Jian-Ping Zheng","doi":"10.1007/s00410-025-02256-y","DOIUrl":"10.1007/s00410-025-02256-y","url":null,"abstract":"<div><p>The North China Craton (NCC) consists of a destroyed eastern part underlain by a sharply thinned lithosphere and an intact western part supported by a deep mantle root. Lithospheric structure under the transitional belt remains poorly constrained but critical for a thorough understanding on the mechanism for the differential destruction of the craton. Here, we explore this problem by lithospheric tomography using newly found kimberlite-borne garnet xenocrysts in the Hebi area, central NCC. The garnets include a high-Mg# (> 85.5, atomic Mg/(Mg + Fe<sup>T</sup>) *100) group mainly equilibrated at high temperatures (1040–1160 °C) and restricted pressures (24–26 kbar), and a low-Mg# (< 85.5) group with a wide range of equilibration temperatures (790–1000 °C) and pressures (20–30 kbar). The inverted thermochemical mantle profile suggests the presence of a ~ 120–130 km thick lithosphere with an overheated and refractory mantle (olivine Mg# > 92) interior. The elevated heavy rare-earth element (HREE, from Ho to Lu) contents of the high-Mg# garnets (∑HREE > 20 ppm) relative to the low-Mg# garnets (∑HREE < 15 ppm) further suggest an element re-distribution due to the heating-induced garnet breakdown within the lithosphere. The selective heating of the refractory lithospheric interior likely reflects preferential asthenospheric upwelling through fossil lithospheric weak zones possibly related to the amalgamation of craton nuclei. Together with the knowledge on the eastern and western NCC, we suggest that the unevenly distributed lithospheric weak zones and the circum-craton tectonics should have jointly shaped the uneven loss of deep root of the craton.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cheng-Yang Sun, Ming-Yue He, Tai-Jin Lu, Shinji Muraishi, Yong-Kang Ding, Yi Deng
{"title":"Extending the metasomatic record in fibrous diamonds: insights from surface etch features","authors":"Cheng-Yang Sun, Ming-Yue He, Tai-Jin Lu, Shinji Muraishi, Yong-Kang Ding, Yi Deng","doi":"10.1007/s00410-025-02251-3","DOIUrl":"10.1007/s00410-025-02251-3","url":null,"abstract":"<div><p>Resorption features formed on diamonds provide key insights into diamond-destructive mantle metasomatism and also offer a novel proxy for constraining kimberlitic fluid composition. However, the surface features of fibrous diamonds remain poorly documented, limiting our understanding of their post-growth history. Here, the etch features, impurity characteristics, and compositions of high-density fluids (HDFs) in the outermost fibrous growth layers of coated diamonds from the Mbuji-Mayi kimberlite, the Democratic Republic of the Congo (DRC) are investigated. These diamonds containing silicic–low-Mg carbonatitic HDFs exhibit negative stepped point-bottomed (p/b), stepped curved-bottomed (c/b), and ‘pure’ c/b trigons without stepped walls, together with positive and truncated trigons on {111} faces. The correlations among different types of trigons, along with the co-occurrence of other surface features, reveal three distinct resorption events–one in the mantle and two during the kimberlite ascent. Comparisons with previous experimental and natural etch features suggest that carbonate-rich melts in the mantle were responsible for stepped p/b trigons on coated diamonds, whereas ‘pure’ c/b trigons and positive trigons both resulted from interaction with CO<sub>2</sub>-rich fluids, but at different depths during kimberlite ascent. This study presents the first systematic dataset of resorption features on fibrous diamonds, advancing our understanding of the formation mechanism of etch features on diamonds under natural settings and extending metasomatic records of fibrous diamonds beyond their crystallization stage. These results suggest a carbonate-rich melt environment after the growth of fibrous diamonds in the lithospheric mantle beneath the Congo craton, and confirm the CO<sub>2</sub>-rich nature of fluids exsolved from the Mbuji-Mayi kimberlite magmas.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02251-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lisa Eberhard, Mattia Luca Mazzucchelli, Stefan Markus Schmalholz, Holger Stünitz, Ahmed Addad, Patrick Cordier, Oliver Plümper
{"title":"Coupling antigorite deformation and dehydration in high-pressure experiments","authors":"Lisa Eberhard, Mattia Luca Mazzucchelli, Stefan Markus Schmalholz, Holger Stünitz, Ahmed Addad, Patrick Cordier, Oliver Plümper","doi":"10.1007/s00410-025-02255-z","DOIUrl":"10.1007/s00410-025-02255-z","url":null,"abstract":"<div><p>The dehydration of antigorite is an important reaction in subduction zones with implications on both geochemical and geophysical processes. In this experimental study we focus on the onset of antigorite dehydration and investigate various chemical and physical parameters as possible drivers for the fluid release. We performed hydrostatic and co-axial Griggs experiments on antigorite serpentinites with variable chemical composition and microstructures at high-pressure and high-temperature conditions across the antigorite dehydration (1.5 GPa, 620–670 °C). For these conditions, our thermodynamic models predict the formation of olivine from magnetite decomposition and partial dehydration of antigorite. Detailed analyses of the run products reveal limited magnetite decomposition. Antigorite dehydration is restricted to samples that have been deformed. Nano-sized olivine and orthopyroxene formed locally in oblique dehydration bands and exhibit neither a clear crystallographic preferred orientation nor a topotactic relation with precursor antigorite. We argue that limited local dehydration in our experiments is related to strain and variations in reaction kinetics. Systematic investigation excludes mineralogical and chemical heterogeneities, and temperature gradients as reaction driving potentials. The structural relation of the dehydration bands suggests deformation-related dehydration, which is supported by numerical simulations that couple reaction kinetics with mechanical work rate and self-consistently predict dehydration bands. In this scenario, strain concentration due to applied axial stress locally increases the internal energy of antigorite to reach the activation energy of the dehydration reaction, enabling dehydration. This study highlights the importance of coupled mechanical and chemical processes and provides a mechanistic framework for deformation-induced dehydration of antigorite.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02255-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144891405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}