Contributions to Mineralogy and Petrology最新文献

{"title":"Timescale of evolution of a late archean collision zone from Coorg, S. India: constraints from zircon and garnet geochronology","authors":"Sampriti Basak,&nbsp;Aitor Cambeses,&nbsp;Sumit Chakraborty,&nbsp;Axel Gerdes,&nbsp;Carsten Münker,&nbsp;Ina Martinet,&nbsp;Somnath Dasgupta,&nbsp;Santanu Kumar Bhowmik","doi":"10.1007/s00410-025-02263-z","DOIUrl":"10.1007/s00410-025-02263-z","url":null,"abstract":"<div><p>Petrology, geochemistry and geochronology of a metapelite (sillimanite-garnet-biotite-plagioclase-quartz) from the vicinity of the Archean Mercara Shear Zone in Coorg, S. India show that metamorphism at temperatures &gt; 850 °C occurred between 2700–3300 Ma (Phase equilibria, thermobarometry, U-Pb dating of zircons and Lu-Hf dating of garnets). Subsequently, the rocks experienced thermal events at lower temperatures at 2400-2600 Ma as well as at 600-640 Ma (U-Pb dates from rutile). There are indications of multiple episodes of metasomatic/ (high temperature) hydrothermal activity during the Archean events. Residence of the rocks at lower temperatures between the high temperature events is indicated by the kinetics of dissolution of zircon in melt. Taken together, this history shows that (a) P-T-t evolution in this Archean collisional setting happened along an overall clockwise path but not in a single continuous loop - episodes at high temperatures were interspersed with residence at cooler temperatures in between, (b) subtle effects of metamorphism that occurred at temperatures below the peak temperature could help to resolve some controversies related to tectonothermal reconstructions in the region (e.g. whether signatures of both - amalgamation of Dharwar and Coorg cratons and activity along an equivalent of the Betsimisaraka suture zone in east-central Madagascar may be present in the region), and (c) the duration of high-temperature events (several 100 million years at ~ 800 °C) are consistent with an early Earth peel-back style of plate tectonics, rather than modern day plate tectonics, operating in the region at the time.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02263-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210964","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":"Petrogenesis and amphibole–melt trace element partitioning of the 156 ka Haramul Mic crystal-rich dacite, Ciomadul, Romania","authors":"Emese Pánczél,&nbsp;Szabolcs Harangi,&nbsp;Maurizio Petrelli,&nbsp;Răzvan–Gabriel Popa,&nbsp;Attila Virág,&nbsp;Ioan Seghedi,&nbsp;Olivier Bachmann,&nbsp;Réka Lukács","doi":"10.1007/s00410-025-02257-x","DOIUrl":"10.1007/s00410-025-02257-x","url":null,"abstract":"<div><p>The 156 ka, crystal-rich (~ 40 vol%) Haramul Mic dacite represents eruption of a crystal mush. It marks the first eruptive product of the Ciomadul Volcanic Complex, East-Central Europe, following at least 100 kyr of dormancy. The mineral phases (plagioclase, amphibole, biotite, apatite, titanite and zircon) and the interstitial glass have relatively restricted major and trace element composition. Thermobarometric and hygrometric calculations indicate a low-temperature (~ 720 °C), low-pressure (~ 300 MPa), water-saturated (dissolved H₂O ~ 6.5 wt%) and oxidizing silicic magmatic system. A comprehensive set of amphibole-melt trace element partition coefficient data is provided, applicable to low-temperature, near-eutectic silicic volcanic and plutonic systems. The maximum partition coefficient (D₀ = 8.7 ± 0.1) and the optimal ionic radius (r₀ = 1.0494 ± 0.0008 Å) for trivalent elements, as determined from Onuma plots, are consistent with an evolved silicic magmatic system and a low-magnesian amphibole composition. Additionally, mineral-melt trace element partition coefficients are calculated for coexistent titanite, zircon, plagioclase and biotite. We note that in highly evolved silicic volcanic systems, partition coefficients remain consistently similar, even with slight variations in magma composition and conditions near the thermal minimum. In contrast to the subsequent eruptions, there is no evidence for mafic magma recharge and mixing as eruption initiation for the Haramul Mic. Instead, effective thermomechanical reactivation of a portion of the long-standing crystal mush, followed by rapid magma ascent is envisaged. Ciomadul provides an example where multiple processes can contribute to eruption initiation, as reflected in the textural and compositional characteristics of the crystal cargo, despite the relatively uniform composition of the erupted magma.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02257-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144566","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":"The fate of boron isotopes in olivine after serpentine dehydration and fluid exposure","authors":"Joshua M. R. Muir,&nbsp;Jan C. M. de Hoog,&nbsp;FeiXiang Liu,&nbsp;Qi Liu,&nbsp;Feiwu Zhang","doi":"10.1007/s00410-025-02267-9","DOIUrl":"10.1007/s00410-025-02267-9","url":null,"abstract":"<div><p>The isotopic ratio of boron in metamorphic and metasomatic olivine can shed light on its origin and fluid sources, but this data cannot be interpreted without understanding the isotopic fractionation of boron between different phases as a function of physical conditions. In this work we use <i>ab-initio</i> Density Functional Theory to calculate relative isotopic fractionation factors for ¹¹B and ¹⁰B in a variety of phases (β_olivine, β_antigorite and β_fluid) at a variety of pressures and temperatures relevant to dehydration of serpentinites, and derive values for Δ¹¹B_{olivine-fluid} and Δ¹¹B_{olivine-antigorite}. We consider new variables (pressure and boron concentration [B]) and new defect sites in olivine and antigorite. We show that fractionation in olivine and serpentine is complex and cannot be considered solely with trigonal/tetrahedral sites and that the effects of pressure and [B] cannot be discarded. For olivine produced by subduction-related antigorite serpentine dehydration we predict that it largely preserves the original B isotopic composition of the solid and that Δ¹¹B_Ol-Srp is generally close to 0. Δ¹¹B_Ol-fluid is large (&gt; −3 to −17‰) and so exposure to metasomatic fluids can overwrite the B isotopic signature of olivine. Variations in these values are controlled primarily by two interrelated key parameters, fluid pH and depth. Boron isotopic systematics in metamorphic olivine are thus predicted to largely be records of internal and external fluid exposures, and the depth of this exposure. Serpentinite material will largely preserve its B isotope signature during subduction dehydration and potentially introduce anomalous material into the deeper mantle, whilst initial isotopic heterogeneities may be reduced by fluid circulation accompanying serpentinite dehydration.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100637","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}

{"title":"Retraction Note: Reconstructing mantle–crust boundary magmatism through Cimmerian orogenic events: evidence from deep crustal cumulates in northeastern Pamir","authors":"Masumeh Sargazi,&nbsp;Chuan-Lin Zhang,&nbsp;Yan Jing,&nbsp;Zahid Hussain,&nbsp;Zhi-Hao Song,&nbsp;Hong-Ran Wang,&nbsp;Xiao-Qiang Liu,&nbsp;Xian-Tao Ye","doi":"10.1007/s00410-025-02270-0","DOIUrl":"10.1007/s00410-025-02270-0","url":null,"abstract":"","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090622","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}

{"title":"Carbon trapping during contact metamorphism in volcanic basins: example of the Guaymas basin","authors":"Alban Cheviet,&nbsp;Philippe Goncalves,&nbsp;Flavien Choulet,&nbsp;Christophe Galerne,&nbsp;Wolfgang Bach,&nbsp;Armelle Riboulleau,&nbsp;Torsten Vennemann,&nbsp;Martine Buatier","doi":"10.1007/s00410-025-02262-0","DOIUrl":"10.1007/s00410-025-02262-0","url":null,"abstract":"<div>\u0000 \u0000 <p>Magmatic activity in young oceanic sedimentary basins impacts the transfer of life-essential volatiles, such as C, S, H and Cl between the Earth’s interior and the surface. The intrusion of magmas into sediments leads to significant remobilization and/or sequestration of carbon and sulphur in the metamorphic aureoles. Core samples from the Guaymas Basin, collected during the IODP 385 expedition include Site U1546, where a tholeiitic sill was encountered. The metamorphic aureole below the sill is characterized by a pyrrhotite-pyroxene-calcite-siderite assemblage in a quartz-bearing matrix. Combining petrological and geochemical analyses, coupled with thermodynamic modelling, we show that cooling under a quasi-closed system conditions controls the precipitation of carbonates in equilibrium with sulphides. In contrast, the upper aureole remains unaffected by retrograde phase precipitation, suggesting that fluids have been totally evacuated from the system. While degassing toward the surface is not in question, we estimate that up to 38% of the carbon (equivalent to 1.26 Mt) may have been trapped in the metamorphic aureoles of the sill U1546 in the Guaymas Basin. At the basin scale, the volume of these metamorphic reservoirs, that are directly correlated to the magmatic activity, and their ability to trap volatiles, are important considerations for global cycles of the volatile elements. These findings contrast with the common view that metamorphic aureoles are always a source of volatiles, which has implications for estimating the volatile release fluxes during past episodes of increased magma-sediment interaction in analogous basin settings and their consequences on the atmospheric carbon cycle.</p>\u0000 </div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00410-025-02262-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073652","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":"Genesis and fate of incipient melt in shallow lower mantle","authors":"Siddharth Khan,&nbsp;Denis Andrault,&nbsp;Pierre Condamine,&nbsp;Federica Schiavi,&nbsp;Jean-Luc Devidal,&nbsp;Nathalie Bolfan-Casanova","doi":"10.1007/s00410-025-02260-2","DOIUrl":"10.1007/s00410-025-02260-2","url":null,"abstract":"<div><p>Geophysical observations have revealed the existence of low-velocity zones that potentially coincide with the ongoing downward flow of mantle material through the globally recognized sharp discontinuity at a depth of 670 km. The leading interpretation for these heterogeneities is related to dehydration induced incipient partial melting. Here, we have employed an iterative method to achieve equilibrium between melt pools and undifferentiated pyrolite at geotherm conditions, allowing for a precise determination of partitioning of the major components (SiO₂-MgO-Al₂O₃-FeO-CaO) between the melt and minerals. The melt holds 5.5 (0.4) wt% H₂O and is relatively mafic compared to its source material, with considerable enrichment in CaO and FeO. For the (shallow) lower mantle in hydrous conditions, the solidus phase is davemaoite, followed by ferropericlase, and bridgmanite becomes the liquidus phase. Density models show that such magma is positively buoyant in the shallow lower mantle. Thus, it is expected to travel upward and possibly freeze in the transition zone. This process implies that, over time, continuous dehydration of the downgoing slab and subsequent hydrous melt extraction from the lower mantle wedge limit the deep water cycle to the upper 670 km depth of the mantle.</p></div>","PeriodicalId":526,"journal":{"name":"Contributions to Mineralogy and Petrology","volume":"180 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073653","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}

{"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,&nbsp;Katsuya Kaneko,&nbsp;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}

{"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,&nbsp;Emilie Bruand,&nbsp;Inês Pereira,&nbsp;Maud Boyet,&nbsp;Deta Gasser,&nbsp;Kurt Stüwe,&nbsp;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}

{"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,&nbsp;A. A. Tomilenko,&nbsp;T. A. Bul’bak,&nbsp;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>O₂) 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 (NH₃), N₂, H₂O, CO₂, CH₄, as well as minor amounts of light alkanes and oxygen-bearing organics, while the NH₃/(N₂ + NH₃) ratio ranges from 0.01 to 0.97. Most of the experimental C-O-H-N fluids contain low fractions of NH₃ (≤ 0.12), while higher values are possible only at very low <i>f</i>O₂ unrealistic for subduction zones at depths &lt; 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 H₂O contents for typical <i>P-T</i>-<i>f</i>O₂ ranges. As inferred previously, the fraction of NH₃ can exceed the N₂ fraction (<span>(:{X}_{{NH}_{3}}^{})</span>/<span>(:{X}_{{N}_{2}})</span> &gt;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 H₂O 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 NH₃ 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 &gt;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}

{"title":"Elastic thermobarometry of natural and experimental quartz inclusions in garnet (QuiG) under tension","authors":"Joseph P. Gonzalez,&nbsp;Mattia L. Mazzucchelli,&nbsp;Jay B. Thomas,&nbsp;Ross J. Angel,&nbsp;Robert S. Darling,&nbsp;Khi X. Atchinson,&nbsp;Mattia Gilio,&nbsp;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_inc) of experimental and natural samples calculated using the quartz phonon mode Grüneisen tensor are too tensile with respect to the expected P_inc 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_inc values obtained using the hydrostatic calibrations of the 128 and 464 cm⁻¹ peaks have better agreement with the expected values and return entrapment conditions that are consistent with petrologically constrained or known experimental pressures. P_inc 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}