Mineralogy and Petrology最新文献

{"title":"Redetermination of the crystal structure of löweite, Na12Mg7(SO4)13(H2O)15","authors":"Peter Grouleff Jensen,&nbsp;Tonči Balić-Žunić,&nbsp;Emil Makovicky","doi":"10.1007/s00710-026-00968-y","DOIUrl":"10.1007/s00710-026-00968-y","url":null,"abstract":"<div><p>The crystal structure of löweite, Na₁₂Mg₇(SO₄)₁₃(H₂O)₁₅, has been redetermined using single-crystal X-ray diffraction on a synthetic crystal to resolve ambiguities present in the original structure reported by Fang and Robinson (1970). The new data were collected with a modern charge-coupled device (CCD)-equipped diffractometer and refined anisotropically. The resulting structure has a trigonal unit cell [space group <i>R</i><span>(:overline3)</span>, <i>a</i> = 18.8483(5) Å, <i>c</i> = 13.4190(4) Å, <i>Z</i> = 3, R₁ = 0.0269, R_w=0.0345]. It confirms previous results while revealing new details, including anisotropically refined oxygen positions with resolved overlaps and most hydrogen positions. Hydrogen atom positions were determined for the two symmetry-independent water molecules’ sites, while they remain unclear for the third one. This redetermination provides a more accurate model of the coordination environments of Mg and Na atoms. It clarifies the features of the hydration and bonding in löweite, with a more detailed description of its crystal structure. It is built on a three-dimensional framework with the composition Na₁₂Mg₆(SO₄)₁₂(H₂O)₁₂ in which hydrogen bonding plays a minor role. This part of the structure conforms with the general chemistry of the Na-Mg sulfate hydrate series and explains the high thermal stability of löweite. The framework contains channels where additional Mg atoms, sulphate groups, and water molecules are situated. This part of the structure contributes to an unusually low Na:Mg ratio, compared to other hydrated Na-Mg sulfates. The channel water molecules exhibit large, anharmonic displacements, possibly due to a combination of bonding to framework Na atoms and hydrogen bonding to an oxygen atom of the channel sulphate group.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"489 - 498"},"PeriodicalIF":1.9,"publicationDate":"2026-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00968-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Primary composition and evolution of kimberlite melts: A case study from the Chigicherla kimberlites with insights from autolith compositions","authors":"Hero Kalra,&nbsp;Ashish Dongre","doi":"10.1007/s00710-025-00965-7","DOIUrl":"10.1007/s00710-025-00965-7","url":null,"abstract":"<div>\u0000 \u0000 <p>This study reports the first detailed characterization of an autolith embedded within the macrocrystic kimberlite CC-5 from the Chigicherla kimberlite cluster in the Wajrakarur Kimberlite Field (WKF), Southern India. These autoliths occur as large, globular, fine-grained fragments and are interpreted as early-crystallized kimberlite material. Their aphanitic texture is caused by undercooling during emplacement. The autolith phase is depleted in MgO (19.13 wt%) and SiO₂ (21.41 wt%), moderately enriched in Al₂O₃ (3.36 wt%), TiO₂ (3.79 wt%) and K₂O (0.42 wt%), and shows notable concentrations of P₂O₅ (1.34 wt%), CaO (16.99 wt%) and FeO_T (12.12 wt%). It is enriched in Light Rare Earth Elements (LREE) e.g., La, Ce, Nd, Sm and High Field Strength Elements (HFSE) such as Zr, Nb, Th and Ta. An attempt has been made to unravel the formation history of the autolith (aphanitic kimberlite), and to establish a compositional relationship with the host macrocrystic kimberlite. The major-element composition of the autolith suggests a slightly evolved melt relative to the primary kimberlite compositions. The evolutionary trends in primary kimberlite melts are further evaluated using fractionation and assimilation models. Lever-rule based compositional diagrams such as MgO versus SiO₂, FeO_T, and CaO indicate that ~ 30–35 wt% entrainment of bulk garnet lherzolite is required to reproduce the composition of the macrocrystic kimberlites, whereas up to ~ 45 wt% entrainment is needed for the olivine lamproites. These constraints suggest significant mantle wall-rock incorporation during melt ascent and evolution. Forward rare earth element modelling was conducted to estimate source compositions across 0.4–1.5% partial melting, assuming 2–5 vol% residual garnet in the mantle source. The resulting source composition aligns closely with the peridotite xenoliths from the Dharwar Craton, supporting derivation from a metasomatized sub-continental lithospheric mantle.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"615 - 635"},"PeriodicalIF":1.9,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148928002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 fluid composition of parental alkaline-ultramafic magmas of dunites from the Guli pluton and olivinites from the Krestovskaya intrusion (Polar Siberia, Russia)","authors":"Liya I. Panina,&nbsp;Aleksandra T. Isakova,&nbsp;Elena Yu. Rokosova,&nbsp;Anatoliy A. Tomilenko,&nbsp;Taras A. Bul’bak","doi":"10.1007/s00710-026-00967-z","DOIUrl":"10.1007/s00710-026-00967-z","url":null,"abstract":"<div>\u0000 \u0000 <p>The data on fluid composition of magma during the formation of dunites of the Guli pluton and olivinites of the Krestovskaya intrusion were obtained by determining the bulk composition of volatile components extracted from melt inclusions in the olivine of the considered rocks using pyrolysis-free gas chromatography-mass spectrometry. The relative concentrations (mol%) of volatile components in the studied mixtures were determined by normalizing the areas of the chromatographic peaks of individual substances to the total area of all peaks. Earlier researches revealed that dunites formed from Na-rich olivine melanephelinite magma. Olivinites formed from K-rich larnite-normative ultramafic magma. These magmas were enriched with hydrocarbons and their oxygenated, sulfonated, and nitrogenated derivatives, CO₂, and H₂O. The total amount of hydrocarbons is 69.39 mol% and 59.61 mol% in melanephelinite magma and larnite-normative ultramafic magma, respectively. Among hydrocarbons oxygenated compounds prevail: 62 mol% in melanephelinite magma and 52.17 mol% in larnite-normative magma. The amount of sulfonated and nitrogenated compounds and CO₂ in melanephelinite magma is 13.2 mol%, 8.1 mol%, and 0.95 mol%, respectively, which is 2–3 times higher compared to that in larnite-normative ultramafic magma. The water content reaches 8.40 mol% in melanephelinite magma and 31.17 mol% in larnite-normative ultramafic magma. The irregular ratios of volatile components in these magmas indicate their significant difference and crystallization of dunites and olivinites from different parental magmas. A comparison of the obtained data with those in diamonds from kimberlite pipes in Yakutia and placer deposits of the northeastern Siberian Craton and the Urals suggests that the generation of magmas responsible for the formation of the studied rocks occurred under reducing conditions in the upper mantle with abiogenic hydrocarbon present.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"577 - 591"},"PeriodicalIF":1.9,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transcrustal magmatic plumbing system of alkaline magmas: insights from the shonkinite dykes from Elchuru alkaline complex, Eastern Ghats Belt, India","authors":"Chinnam Naidu M,&nbsp;Sachin S. Ghodke,&nbsp;Gaurav J. Kokandakar,&nbsp;B. Nagaraju,&nbsp;Laxman B. More,&nbsp;Munjaji V. Bhosle,&nbsp;K. Rathna,&nbsp;K. Vijaya Kumar","doi":"10.1007/s00710-026-00971-3","DOIUrl":"10.1007/s00710-026-00971-3","url":null,"abstract":"<div>\u0000 \u0000 <p>The Elchuru alkaline complex in the Prakasam Alkaline Province (PAP), Eastern Ghats Belt, SE India, was intruded by coeval shonkinite dykes during ca. 1350 Ma continental rift-related magmatism. The shonkinite dykes have fine-to-medium-grained porphyritic to equigranular textures with clinopyroxene, biotite, amphibole, K-feldspar perthite, nepheline, and plagioclase as major mineral phases. Based on mineral-melt chemical disequilibrium and P-T estimates of mineral crystallization, we propose that multiple magma reservoirs existed at various crustal depths. The crystallization sequence of clinopyroxene-biotite-amphibole correlates with mineral saturation under diverse P-T conditions. Magmas parental to the shonkinite dykes experienced transcrustal differentiation at ~ 12 kbar and ~ 1160℃ (during dominantly clinopyroxene fractionation), ~ 6 kbar and ~ 830℃ (during biotite fractionation), and ~ 3 kbar and ~ 810℃ (during amphibole, K-feldspar, nepheline, and plagioclase fractionation). The depths of magma reservoirs, the “plumbing” system of the shonkinite dykes were ~ 35 km (deeper), ~ 20 km (intermediate) and ~ 10 km (shallower). The transcrustal plumbing system of magma was in an active continental rift setting.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"593 - 614"},"PeriodicalIF":1.9,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trace element mass transfer during the retrogression of biotite and cordierite","authors":"Elisa Oliveira da Costa,&nbsp;Leo M. Kriegsman,&nbsp;Barbara E. Kunz,&nbsp;Clare J. Warren,&nbsp;Tom T. Argles","doi":"10.1007/s00710-026-00972-2","DOIUrl":"10.1007/s00710-026-00972-2","url":null,"abstract":"<div>\u0000 \u0000 <p>The crustal element cycle allows continuous redistribution of elements through different crustal reservoirs. Although retrogression after peak metamorphism is commonly known to affect both major and trace elements, particularly in the presence of fluids, much is still unknown about the trace element mass transfer associated with specific retrograde reactions. This study investigates the extent to which the retrograde breakdown of biotite and cordierite – key hosts of Li, Be, Cs, Sn, Ta and W in metapelites and granites – can mobilise their hosted critical elements. We combined petrography, <i>in-situ</i> mineral major and trace element analysis, bulk-rock major element analysis, geothermometry, phase equilibria modelling and mass transfer estimates to investigate the breakdown of biotite and cordierite to chlorite and pinite, respectively. The biotite to chlorite reaction (350–500 °C) requires fluid influx to produce the observed volumes of chlorite, muscovite, ilmenite, and rutile. This reaction results in substantial mobilisation of Cs and moderate losses of Li and Sn, while W, Nb, and Ta remain relatively immobile. Cordierite breaks down below ~ 200 °C into fine-grained aggregates of kaolinite and smectite clays (known as pinite), with element mobilisation varying with the degree of replacement, fluid composition and clay mineralogy. Li, Be, and Cs show contrasting behaviours, with mobilisation enhanced in Fe- and Mg-poor clays under open-system conditions. Our findings highlight that the breakdown of biotite and cordierite releases critical elements stored in these phases, which could potentially generate enriched fluids.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"555 - 575"},"PeriodicalIF":1.9,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00972-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Cation ordering in the annabergite-erythrite-hörnesite solid solutions","authors":"Juraj Majzlan,&nbsp;Daniel M Többens,&nbsp;Christian Lengauer","doi":"10.1007/s00710-025-00963-9","DOIUrl":"10.1007/s00710-025-00963-9","url":null,"abstract":"<div>\u0000 \u0000 <p>The solid solutions among annabergite [Ni₃(AsO₄)₂·8H₂O], erythrite [Co₃(AsO₄)₂·8H₂O], and hörnesite [Mg₃(AsO₄)₂·8H₂O] may control the arsenic concentrations in some mine wastes or natural systems rich in arsenic. These solid solutions are continuous and the divalent cations occur on two types of octahedral sites: the monomeric 2<i>a</i> sites and the dimeric 4<i>g</i> sites. The cation ordering influences the configuration entropy of mixing and hence, the thermodynamic properties, stability, and solubility of these solid solutions. In this work, cation ordering was investigated by constant-wavelength powder X-ray diffraction (for Ni-Mg and Co-Mg solid solutions) and by anomalous X-ray diffraction (for Ni-Co s.s.). For the Ni-Mg and Co-Mg systems, we found a strong preference of Mg²⁺ for the 4<i>g</i> site. In the Ni-Co series, the ordering is weak, with Co²⁺ being slightly preferred at the 2<i>a</i> site. The entropies of mixing, calculated from our data, are sufficiently large to retain negative Gibbs energies of mixing in these solid solutions, even though in some cases, the mixing enthalpies are positive. Hence, the mixing in these solutions is spontaneous and the cation uptake under natural conditions will be mostly dictated by the difference in the solubility products of the end members.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"483 - 488"},"PeriodicalIF":1.9,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-025-00963-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Coupled dissolution and precipitation at the anglesite - arsenate solution interface","authors":"Ewa Stępień,&nbsp;Maciej Manecki","doi":"10.1007/s00710-025-00964-8","DOIUrl":"10.1007/s00710-025-00964-8","url":null,"abstract":"<div><p>Mineral replacement reactions influence the long-term fate of arsenic in natural and contaminated environments. This study explores the transformation of anglesite (PbSO₄) in contact with arsenate-bearing solutions, focusing on how pH, ion concentrations, and temperature affect replacement mechanisms, products and arsenate sequestration. Synthetic or natural anglesite crystals were reacted with arsenate solutions (5 or 50 mg As/L) in the presence of chloride ions (Cl⁻), across a pH range of 2–8 for up to 3 months. Cl⁻ promoted the formation of mimetite (Pb₅(AsO₄)₃Cl), particularly at circumneutral pH. The reaction pathway was pH-dependent: schultenite (PbHAsO₄) formed at pH 2, while mimetite precipitated at pH 4–8. At low arsenate concentrations, mimetite nucleated locally and gradually formed patchy crusts; at higher concentrations, arsenate phases crystallized both heterogeneously and homogeneously, producing extensive encrustations. SEM imaging showed etch pits from anglesite dissolution and mimetite crusts (2–100 μm) whose thickness varied with crystal morphology. A reaction front gap suggested diffusion-limited growth. Under acidic conditions, schultenite grew inward with a sharp boundary, indicating partial replacement. Temperature and pressure did not alter the replacement mechanism but influenced growth rates, with larger crystals observed under hydrothermal conditions. Arsenic sequestration efficiencies ranged from 23.0% to 84.4%, depending on the experimental conditions. These findings reveal how fluid composition and environmental parameters govern arsenate immobilization by secondary lead minerals, providing mechanistic insight into mineral-fluid interactions relevant for the stability of arsenate in natural systems.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"455 - 472"},"PeriodicalIF":1.9,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hopmannite, Ba2(Ti5Fe)O13, a new hexatitanate from the Bellerberg volcano, Germany","authors":"Rafał Juroszek,&nbsp;Biljana Krüger,&nbsp;Georgia Cametti,&nbsp;Beata Marciniak-Maliszewska,&nbsp;Christof Schäfer","doi":"10.1007/s00710-025-00959-5","DOIUrl":"10.1007/s00710-025-00959-5","url":null,"abstract":"<div><p>Hopmannite, ideally Ba₂(Ti₅Fe)O₁₃, is a new Ba-dominant hexatitanate discovered in xenoliths enclosed within the basaltic host rocks of the Bellerberg volcano in Germany. The mineral exhibits black to dark-grey thin platy crystals, with submetallic lustre and a perfect cleavage along (100). The empirical formula of the holotype hopmannite, calculated on the basis of 8 cations and 13 O atoms, is (Ba_1.00K_0.61Na_0.24Sr_0.08Ca_0.04)_Σ1.97(Ti_5.36 Fe²⁺_0.48Fe³⁺_0.13Mg_0.06)_Σ6.03O₁₃. Hopmannite is monoclinic, space group <i>C</i>2/<i>m</i>, with <i>a</i> = 15.357(2) Å, <i>b</i> = 3.8500(7) Å, <i>c</i> = 9.129(2) Å, <i>β</i> = 99.033(10)°, <i>V</i> = 533.03(17) ų and <i>Z</i> = 2 and is isostructural with nixonite, Na₂Ti₆O₁₃ and jeppeite, K₂Ti₆O₁₃. The structure of hopmannite consists of a fundamental unit composed of three edge-shared Ti-octahedra duplicated above and below in the direction of the <i>b</i>-axis, which form an open octahedral framework enclosing a tunnel, cubic-like sites occupied by Ba, K, and Na. The structural results are consistent with the chemical data and show that the Ba²⁺ content is greater than K⁺ and Na⁺ at the A-cation site. Spectroscopic analyses indicated that the presence of the main vibrations is related to TiO₆ octahedra, including Ti-O and Ti-O-Ti stretching vibrations. Hopmannite, along with fresnoite and batisite, represents a mineral assemblage formed late in the crystallisation sequence at temperatures below 1000 °C from a highly alkaline residual melt enriched in incompatible elements such as Ba, Sr, Ti, Zr, and P.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 1","pages":"227 - 240"},"PeriodicalIF":1.1,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-025-00959-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Magmatic and solid-state flow of a 3.3 Ga rhyolite from the Gavião Block, São Francisco Craton, Brazil","authors":"Flávia Braga de Oliveira,&nbsp;Leonardo Lagoeiro,&nbsp;Gilberto Álvares da Silva,&nbsp;Stefano Albino Zincone,&nbsp;Eliana Marinho Branches Farias,&nbsp;Leonardo Martins Graça","doi":"10.1007/s00710-025-00960-y","DOIUrl":"10.1007/s00710-025-00960-y","url":null,"abstract":"<div><p>The distinction between magmatic and solid-state flow can be complex in some rocks, especially rhyolites, which tend to deform differently than other quartz-feldspathic rocks. Furthermore, this type of study in Paleoarchean rhyolites is extremely rare. In this sense, this work presents field data, microstructural analysis, and electron-backscatter diffraction (EBSD) analyses of quartz porphyroclasts and aggregates from the 3.3 Ga Contendas Rhyolite in the Gavião Block, northeastern Brazil. The Contendas Rhyolite presents the superposition of magmatic and solid-state processes. It displays preserved igneous characteristics (such as euhedral feldspar phenocrysts, feldspars with rapakivi microstructure, and quartz porphyroclasts with primary embayments) coexisting with solid-state deformation microstructures (recrystallized tails, recrystallized elongated aggregates of quartz, and deformation twins). There is evidence that the magmatic flow occurred in the N-S direction, defined by the N-S alignment of feldspar phenocrysts and quartz porphyroclasts, and by the N-S orientation of the [c] axes of the parent grains of the quartz porphyroclasts. On the other hand, quartz porphyroclasts were deformed by dislocation creep, with dominance of the prism <span>(leftlangle arightrangle)</span> slip, and recrystallize by subgrain-rotation. The approximately N-S trending tectonic foliation and up-dip mineral stretching lineation of the Contendas Rhyolite indicate that solid-state deformation occurred in the E-W direction, which favored the preservation of the magmatic fabric. Moreover, the microstructural and textural characteristics of the Contendas Rhyolite define medium-grade solid-state deformation, with a temporal break between magmatic and solid-state flows.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 1","pages":"209 - 225"},"PeriodicalIF":1.1,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochronology, geochemistry and genesis of the Shanwang fluorite deposit in central Zhejiang, SE China: implications for hydrothermal evolution within a pre-existing caldera","authors":"Xi-Yao Li,&nbsp;Chong Jin,&nbsp;Weijun Xu,&nbsp;Sanzhong Li,&nbsp;Xianzhi Cao,&nbsp;Fengjian Ge,&nbsp;Pengcheng Wang,&nbsp;Liyong Gong","doi":"10.1007/s00710-025-00958-6","DOIUrl":"10.1007/s00710-025-00958-6","url":null,"abstract":"<div><p>Southeast China hosts extensive Late Mesozoic metallogenic systems, including metallic and non-metallic deposits genetically linked to tectonic-thermal events. Central Zhejiang Province, a major fluorite-producing region in China, exhibits spatiotemporal relationships with the Cretaceous magmatic-hydrothermal activity. In this study, zircon U–Pb and fluorite Sm–Nd geochronology, whole-rock/mineral geochemistry, Sr–Nd–H–O–Ca isotopes, and fluid inclusion microthermometry were used to constrain the genesis of the Shanwang fluorite deposit in the Mazhai caldera, central Zhejiang. Fluorite orebodies are structurally controlled by intracaldera faults and contain fluorite–quartz–barite–pyrite–pyrophyllite assemblages. Geochronological data revealed that fluorite mineralization (77 Ma, Sm–Nd isochron age) postdated the Early Cretaceous caldera-forming volcanism (128–125 Ma, zircon U–Pb age). Fluid inclusion data indicated low-temperature (128–184 °C) and low-salinity (0.2–8.8 wt.% NaCl eqv.) hydrothermal conditions. Stable isotopes (δD_VSMOW = -101.8‰ to -64.9‰, δ¹⁸O_VSMOW = -10.4‰ to -6.9‰) confirm meteoric water-dominated fluids. Integrated Sr–Nd–Ca isotopes (fluorite δ^44/40Ca values = 1.29–1.35‰) and trace element characteristics demonstrate that ore-forming materials were primarily leached from volcanic rocks via meteoric water–rock interaction in a paleo-geothermal system, with subsequent migration along fault zones leading to fluorite precipitation. Mineralization is correlated with Late Cretaceous lithospheric extension driven by the Paleo-Pacific slab rollback beneath Southeast China.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 1","pages":"187 - 207"},"PeriodicalIF":1.1,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147342346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}