Mineralogy and Petrology最新文献

{"title":"Reactivation of Neoproterozoic juvenile crust and relict enriched lithospheric mantle in eastern China: contribution to Mesozoic pyroxene diorite in the Tongling district","authors":"Linsen Jin,&nbsp;Xiaochun Xu,&nbsp;Xinyue Xu,&nbsp;Zhongyang Fu,&nbsp;Ruyu Bai,&nbsp;Qiaoqin Xie","doi":"10.1007/s00710-026-00986-w","DOIUrl":"10.1007/s00710-026-00986-w","url":null,"abstract":"<div>\u0000 \u0000 <p>The Tongling district is a significant tectonic–magmatic–metallogenic region in eastern China. However, the genesis and tectonic setting of its magmatic rocks have long been debated. Historically, research has focused primarily on intermediate–acidic intrusive rocks, while the potential genetic implications of intermediate–mafic intrusions have been overlooked. Here, the Baimangshan pyroxene diorite in the district is investigated through analyses of whole–rock geochemistry, Sr–Nd isotopes, mineral microstructures and geochemistry, and zircon Hf–O isotopes. The results indicate that these rocks are characterized by high-K calc-alkaline series and arc-like characteristics and are enriched in large ion lithophile elements (LILEs) than Ocean Island Basalt (OIB), suggesting that the magma was derived from crust–mantle mixture. Unique mineral textures reflect the injection of high-temperature mafic magmas into acidic magmas. Inherited zircon ages are concentrated between 1000 and 700 Ma, reflecting that the sources include a Neoproterozoic crust. The similarity of zircon ε_Hf(<i>t</i>), two-stage Hf model ages and δ¹⁸O values with those of Neoproterozoic magmatic rocks in the Jiangnan Orogen indicate the source rock of crust-derived magma is a Neoproterozoic juvenile crust that has undergone low-T alteration. Apatites have high Cl contents, and their rims have higher SO₃, FeO and MgO contents than their cores, suggesting that mantle-derived magma was derived from a subduction-metasomatized enriched mantle. Coupled Nd–Hf isotopes suggest that oceanic crust was formed during the Mesoproterozoic. Zircon Hf–O isotopes suggest the contribution of the Neoproterozoic Cathaysia Oceanic subduction to the sources. Thus, the formation of sources was controlled by the Neoproterozoic subduction, rather than the Mesozoic Paleo-Pacific Plate subduction. This finding reflects the reactivation of the Neoproterozoic materials, with Mesozoic Paleo-Pacific Plate subduction serving as the geodynamic mechanism that reactivated these sources.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"701 - 719"},"PeriodicalIF":1.9,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926247","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":"Dynamics of large and hot subduction-accretion complexes: insights from fossil Paleozoic and active Cenozoic systems","authors":"Armin Dielforder,&nbsp;Roger Zurbriggen","doi":"10.1007/s00710-026-00976-y","DOIUrl":"10.1007/s00710-026-00976-y","url":null,"abstract":"<div>\u0000 \u0000 <p>In the aftermath of Neoproterozoic Panafrican orogenies including the Cadomian orogeny, the erosion of mountain belts increased the sediment supply into circum-Gondwanan subduction systems. In response, super-large subduction-accretion complexes that encompassed the entire upper plate formed during the Cambrian and Ordovician. Cenerian basement units within and outside the European Alps were recently interpreted to represent remnants of such Cambro-Ordovician subduction-accretion complexes hosting a predominantly peraluminous magmatic arc. However, the dynamics and cratonization process of such hot complexes has not been evaluated in mechanical terms. We therefore corroborate the existing model based on petrological data by mechanical considerations and insights from active subduction zones with respect to the following three aspects of Cenerian basement units: Firstly, the lithological spectra, the rock volumes and metamorphic record indicate a crust recycling process as it occurs at an active margin, fed by a very high sediment supply, and hosting a peraluminous magmatic arc. Secondly, moderately to steeply oriented elongated sheets of plutonic bodies point to synmagmatic strike-slip faulting and margin-parallel shear indicating oblique subduction and a near-neutral stress state in the thermally weakened volcanic arc region. Thirdly, the Cenerian pressure-temperature-time (P-T-t) evolution is in line with lateral crustal growth by analogy to modern subduction-accretion systems, without producing high topography of an overthickened crust due to the low-stress conditions. The geological and mechanical constraints gained from active subduction-accretion systems are consistent with field observations and the petrology of Cenerian crystalline basements units regarding the setting of super-large cratonizing subduction-accretion complexes during anatexis and peraluminous arc magmatism.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 2","pages":"441 - 453"},"PeriodicalIF":1.1,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00976-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172558","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":"Thermodynamic equilibrium of Al2SiO5 polymorphs in the triple point as a function of rock and fluid composition","authors":"Margaret V. Artimenko,&nbsp;Sergey Yu. Skuzovatov","doi":"10.1007/s00710-026-00983-z","DOIUrl":"10.1007/s00710-026-00983-z","url":null,"abstract":"<div>\u0000 \u0000 <p>Geologists have been debating for decades whether or not the Al₂SiO₅ polymorphs (andalusite, kyanite and sillimanite) can coexist with one another in thermodynamic equilibrium in natural rocks at the P–T conditions of the triple point. Such rocks have not yet been reliably identified in nature. The technique of thermodynamic-potential minimization allows us to determine the bulk rock, fluid composition and other factors that could influence the stability of Al₂SiO₅ polymorphs. In this theoretical study, the stable equilibrium coexistence of all three polymorphs was considered in mineral assemblages comprising plagioclase ± quartz ± paragonite ± graphite, biotite ± muscovite ± quartz ± magnetite ± graphite and at the P–T conditions of the triple point. It is shown how the hydrogen, oxygen and carbon-content in a metamorphic fluid can influence both the stable mineral assemblage and the equilibrium coexistence of the Al₂SiO₅ polymorphs. The effect of such elements as Na, Fe, Mg, Mn, Ti and P was studied using the bulk composition of a natural rock sample. A series of restrictions on the bulk composition of the mineral assemblage comprising Al₂SiO₅ polymorphs have been identified.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"523 - 536"},"PeriodicalIF":1.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926427","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":"Formation and fluid-driven transformation of accessory Zr–Th–U and REE minerals in an F-rich environment: the Markersbach A-type granite, Erzgebirge, Germany","authors":"Martin Ondrejka,&nbsp;Hans-Jürgen Förster,&nbsp;Maëlys Bévan,&nbsp;Pavel Uher,&nbsp;Chrisfanel Eurode Kianguebene-Koussingounina,&nbsp;Marek Osacký,&nbsp;Nasser Mourad Mahdy","doi":"10.1007/s00710-026-00981-1","DOIUrl":"10.1007/s00710-026-00981-1","url":null,"abstract":"<div>\u0000 \u0000 <p>The Markersbach intrusion (Erzgebirge, Germany) is a late Variscan, early post-collisional, highly evolved, autometasomatically and hydrothermally altered F-rich, P-poor, aluminous A-type granite. It ranges from coarse-grained biotite monzogranite to fine-grained leucosyenogranite. The rich accessory mineral assemblage comprises, in addition to diverse Nb–Ta–Sn–W–Ti–Fe species, abundant zircon, thorite, topaz fluorite and fluocerite-(Ce), rare xenotime-(Y) and chernovite-(Y), synchysite-(Y) enriched in thorbästnasite component, synchysite-(Ce) and extremely rare monazite-(Ce). Lithium-rich siderophyllite commonly hosts annular radiohaloes developed around Th-rich zircon and thorite. These consist of Th-rich, metamict cores surrounded by a clay-rich alteration zone and a non-stoichiometric Th–Y–Si rim that locally is rimmed by goethite (± limonite). Their textures reflect alpha-recoil damage and localised element redistribution. The dimensions of the haloes and mineral compositions indicate radiation damage controlled predominantly by the ²³²Th decay chain. Zircon, thorite and xenotime form complex Zr(Hf)–Th(U)–Y(REE) solid-solutions (with REE – rare earth elements), which commonly experienced strong metamictisation, hydration and fluorination [≤ 6.8 wt% F in thorite, ≤ 3.8 wt% F in zircon, ≤ 1.1 wt% F in xenotime-(Y)]. Zircon and thorite are the principal hosts of immobile Th, whereas U is largely sequestered in secondary pyrochlore. Interaction with late fluids gave rise to local destabilisation of monazite-(Ce) and promoted various dissolution–reprecipitation reactions, producing Y-poor fluorite II, synchysite-(Y), and sporadic Ca_0.5Th_0.5F₃ micro-inclusions in re-equilibrated fluocerite-(Ce). Rare chernovite-(Y) and As-bearing zircon–thorite assemblages further imply the involvement of oxidising, As-rich fluids. The evolution of REE–Zr–Th–U mineral phases records both the fractionation history of the halogen-enriched, P-poor parental melt and the subsequent subsolidus fluid-mediated re-equilibration in an F-rich environment, resulting in multi-stage LILE and HFSE redistribution within the granite, postdated by widespread U removal from the granite in the Cretaceous.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 2","pages":"273 - 293"},"PeriodicalIF":1.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00981-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172593","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":"Nomenclature and classification of the jeppeite group","authors":"Rafał Juroszek,&nbsp;Biljana Krüger,&nbsp;Christof Schäfer","doi":"10.1007/s00710-026-00982-0","DOIUrl":"10.1007/s00710-026-00982-0","url":null,"abstract":"<div>\u0000 \u0000 <p>The jeppeite group, approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA-CNMNC), comprises natural hexatitanate minerals with the general crystal-chemical formula ^VIII<i>A</i>₂^VI<i>M</i>₆O₁₃. Currently, three species are recognised: jeppeite K₂Ti₆O₁₃, nixonite Na₂Ti₆O₁₃, and hopmannite Ba₂(Ti₅Fe)O₁₃. In natural compositions, the polyhedral <i>A</i> site is occupied by the monovalent Na and K, and by the divalent Ba, Ca and Sr, whereas the octahedral <i>M</i> sites are predominantly occupied by Ti⁴⁺ with possible substitutions by Nb⁵⁺, Zr⁴⁺, Fe³⁺, V³⁺, Cr³⁺, Fe²⁺, Mg²⁺ or Mn²⁺. These compositional variations give rise to charge-balanced formula schemes, such as <i>A</i>₂⁺<i>M</i>₆⁴⁺O₁₃, characteristic for jeppeite and nixonite, and <i>A</i>₂²⁺(<i>M</i>₅⁴⁺<i>M</i>²⁺)_Σ6O₁₃, exemplified by hopmannite. Structurally, jeppeite-group minerals crystallise in the monoclinic system, space group <i>C</i>2/<i>m</i>. Their structure consists of an open framework built from zig-zag ribbons of <i>M</i>O₆ octahedra. These corner-sharing ribbons form tunnels that are partially filled, up to two-thirds, by <i>A</i>-site cations. The abundance of synthetic analogues suggests significant potential for additional natural species, which is why nomenclature guidelines have been generated to clarify the classification of future jeppeite-group minerals.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"499 - 508"},"PeriodicalIF":1.9,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927946","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":"Origin of violet colour in agates from Chihuahua, Northern Mexico","authors":"Jens Götze,&nbsp;Maximilian Mrozik,&nbsp;Madison DeCorby,&nbsp;Yuanming Pan,&nbsp;Manfred Wildner","doi":"10.1007/s00710-026-00977-x","DOIUrl":"10.1007/s00710-026-00977-x","url":null,"abstract":"<div>\u0000 \u0000 <p>Agate samples from the Rancho Coyamito (Chihuahua, Mexico) were investigated to reveal the origin of their conspicuous violet coloured chalcedony bands. The comprehensive geochemical and spectroscopic investigations comprised trace element analyses by inductively coupled plasma-mass spectroscopy (ICP-MS), optical absorption spectroscopy, electron paramagnetic resonance (EPR) spectroscopy as well as cathodoluminescence (CL) microscopy and spectroscopy. The results show that the violet colour is probably caused by a colour centre similar to the amethyst Fe⁴⁺ centre in macrocrystalline quartz, while in yellowish and reddish chalcedony bands of the same agates iron is mainly incorporated as micro-inclusions of goethite and hematite, respectively. Absorption measurements on the violet agate bands confirmed the typical absorption bands for amethyst at ~ 350 nm, 545 nm, and 950 nm. EPR spectra of violet agates measured at room temperature revealed a suite of previously reported Fe³⁺ signals, and those collected at a liquid-helium temperature of 30 K and microwave powers up to ~ 66.5 mW suggest the amethyst Fe⁴⁺ centre. The Fe⁴⁺ centre, which is most likely responsible for the violet colour, was probably transformed from trivalent iron via high-energy radiation. Elevated concentrations of uranium (up to 32.5 ppm) were measured in violet chalcedony bands, and uranyl ions (UO₂²⁺) were detected by CL microscopy and spectroscopy. Annealing treatments at 430 °C and 550 °C for 24 h resulted in complete bleaching of the former violet colour. EPR spectra of these annealed agate samples revealed the same suite of Fe³⁺ centres as in the initial spectra, but at enhanced intensities.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"509 - 521"},"PeriodicalIF":1.9,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00977-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927891","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":"Genesis of the Bijiawan Pb-Zn deposit in Western Qinling, China: evidence from trace elements and sulfur isotopes in sphalerite","authors":"Ronglong Bai,&nbsp;Fei Feng,&nbsp;Dongbao Guo,&nbsp;Xuefeng Chen,&nbsp;Lijuan Yang","doi":"10.1007/s00710-026-00970-4","DOIUrl":"10.1007/s00710-026-00970-4","url":null,"abstract":"<div>\u0000 \u0000 <p>The Bijiawan Pb-Zn deposit is situated within the metallogenic belt of the Western Qinling, China, yet its genesis remains ambiguous. In this study, LA-ICP-MS was employed to analyze sphalerite ore samples, revealing that sphalerite in the deposit is notably enriched in Cd and Fe, and moderately enriched in Mn and Ga. The ore-forming temperatures for the limestone-hosted sphalerite range from 150℃ to 168℃, while those for the phyllite-hosted sphalerite range from 232℃ to 239℃. Trace element analyses indicate several key substitution mechanisms: Zn²⁺ ↔ Fe²⁺ and Zn²⁺ ↔ Cd²⁺, reflecting coupled substitution between Cd and Fe; Fe²⁺ + Mn²⁺ → 2Zn²⁺, suggesting an interaction between Fe and Mn; a coupling substitution of 2Zn²⁺ ↔ Ag⁺ + Sb³⁺ between Ag and Sb; and, specifically in the phyllite-type sphalerite, a substitution of Sb³⁺ + Cu⁺ → 2Zn²⁺ between Sb and Cu. Trace element discrimination diagrams show a strong affinity of both sphalerite types with Mississippi Valley-type (MVT) Pb-Zn deposits. The Zn/Cd ratio further suggest a relationship to metamorphosed sedimentary deposits and stratiform deposits within carbonate rocks, with the majority of data points falling within the MVT deposits region on trace element diagrams. Sulfur isotope analysis reveals average δ³⁴S values of 15.95‰ for limestone-hosted sphalerite and 18.75‰ for phyllite-hosted sphalerite. The sulfur is primarily derived from the reduction of seawater sulfate or strata-bound sulfate, with thermochemical reduction processes likely being the dominant mechanism. In conclusion, the Bijiawan Pb-Zn deposit is classified as a MVT deposit.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"637 - 656"},"PeriodicalIF":1.9,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927969","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":"Controls on polymetamorphism in the Southern Pan-African Kaoko belt (Namibia) by petrochronology with EPMA Th-U-Pb monazite dating and geothermobarometry in Garnet metapelites","authors":"Bernhard Schulz,&nbsp;Thomas M. Will","doi":"10.1007/s00710-026-00974-0","DOIUrl":"10.1007/s00710-026-00974-0","url":null,"abstract":"<div>\u0000 \u0000 <p>Petrochronology with garnet and monazite was performed on refurbished metapelite samples from the Central Kaoko Zone (CKZ), the Western Kaoko Zone (WKZ) and the Orogenic Core Zone (OCZ). P-T path segments of garnet crystallisation were reconstructed by geothermobarometry based on continuous cation exchange and net transfer reactions. The oldest metamorphic monazite populations of 1490 ± 15 Ma and 635 ± 7 Ma occur enclosed in garnet porphyroblasts and signal Meso-Proterozoic and early Pan-African high-grade metamorphic events. According to the sample position next to a ~ 550 Ma granitoid gneiss, a monazite population at 552 ± 4 Ma may be assigned to a local contact metamorphism. In the WKZ and OCZ the further monazite age isochrones range from 546 ± 12 Ma to 532 ± 5 Ma, and in the CKZ from 528 ± 4 Ma to 502 ± 5 Ma. When interpreted in terms of metamorphic P-T paths and the stability field of monazite, the formation of these late Pan-African monazites are pre-, syn-, and postcrystalline to late Pan-African garnet blastesis. P-T conditions for Mg-rich garnet rims increase from E to W within the CKZ from 550 to 650 °C at 9 kbar. Maximal P-T conditions in the OCZ were 705 °C/7.9 kbar. Garnets in the WKZ display retrograde zonation trends with Mg-rich cores crystallising at 700 °C/4–6 kbar. In the westernmost WKZ sample the garnet core crystallised at 780 °C/7.4 kbar and could be of early Pan-African age. Monazite ages and geothermobarometry confirm results from isotope age dating methods.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 2","pages":"359 - 379"},"PeriodicalIF":1.1,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00974-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172960","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":"Geochronology and mineral geochemistry of apatite and zircon in the Hutouya Skarn deposit, East Kunlun Mountains, NW China","authors":"Hongying Qu,&nbsp;Julie Rowland,&nbsp;Jingwen Mao,&nbsp;Ivan Belousov,&nbsp;Evan Orovan,&nbsp;Michael Rowe,&nbsp;Shihua Zhong,&nbsp;Yitian Wang","doi":"10.1007/s00710-026-00969-x","DOIUrl":"10.1007/s00710-026-00969-x","url":null,"abstract":"<div>\u0000 \u0000 <p>Consistency between apatite and zircon petrochronology supports the robustness in fingerprinting igneous processes in porphyry systems. In this paper, we systematically investigate geochronology and mineral chemistry of apatite and zircon hosted in syenogranite and monzogranite intrusive rocks in the large Hutouya skarn-type Cu–Pb–Zn–Fe deposit, in order to corroborate their potential chronological monitoring capabilities in fingerprinting igneous processes in porphyry systems. Zircon grains of magmatic origin provide crystallization ages of 224.70 ± 0.61 Ma in the syenogranite and 225.75 ± 0.66 Ma / 226.31 ± 0.78 Ma in the monzogranite, respectively. Apatite yield ages of 229.0 ± 6.6 Ma in syenogranite and 224.3 ± 4.5 Ma / 223.7 ± 3.9 Ma in monzogranite and are within analytical uncertainty of ages displayed by zircon. Geochronology results suggest that the associated hydrothermal mineralization events at Hutouya probably have similar short durations of just a few million years or less. Trace element compositions in the two intrusives indicate the apatite and zircon crystallized under volatile-undersaturated conditions and have primary a magmatic origin. However, in the later volatile-oversaturated stage, the early crystallizing zircon is altered by the fluid phase, and shows distinctive amorphous textures with pores filled with numerous hydrothermal minerals. Accordingly, U–Pb dates of apatite and zircon, as well as corresponding in-situ trace element compositions, can provide constraints on rock formation ages, temperature, oxygen fugacity, magma source, and tectonic background.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 3","pages":"657 - 674"},"PeriodicalIF":1.9,"publicationDate":"2026-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00969-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927811","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":"Contrasting behaviour of accessory phases during partial melting of orthogneiss – a case study from Mt. Papuk, Croatia","authors":"Daniela Gallhofer,&nbsp;Etienne Skrzypek,&nbsp;Petra Schneider,&nbsp;Dražen Balen,&nbsp;Christoph A. Hauzenberger","doi":"10.1007/s00710-026-00975-z","DOIUrl":"10.1007/s00710-026-00975-z","url":null,"abstract":"<div>\u0000 \u0000 <p>Partial melting during the tectono-metamorphic evolution of collisional orogens results in the formation of migmatites or granitoids and partial to full resorption of the precursor’s accessory phases, such as zircon and monazite. While in many cases both minerals newly crystallize from partial melt, they can also show contrasting degrees of preservation/dissolution. This study presents an example of nearly full zircon preservation but completely new monazite growth during partial melting of a mildly peraluminous orthogneiss from Mt. Papuk, Croatia. We combine U-Pb zircon and Th-U-total Pb monazite dating, zircon trace element and whole rock geochemical data with phase equilibria modelling and use solubility models of accessory phases to constrain the P-T conditions of partial melting. Zircon textures support igneous crystallization while trace elements are characteristic for an S-type granite composition. Zircon yields a Cambrian crystallization age of the protolith at 498.9 ± 6.9 Ma. Conversely, monazite records only Carboniferous anatexis of the orthogneiss at ca. 350 Ma, while zircon mostly remains unaffected. The results of phase equilibria modelling that account for nearly full zircon preservation (&lt; 10% dissolution) and complete monazite dissolution and regrowth indicate P-T conditions of 5-8.5 kbar and 760–800 °C. Our results suggest that a low degree of partial melting (&lt; 10 vol%) in an orthogneiss with an S-type granite signature may occur without water influx at &lt; 800 °C. This will preserve protolith ages in zircon but erase them in original monazite. The contrasting behaviour of these accessory chronometers can be used as a tool to bracket the temperature conditions of anatexis.</p>\u0000 </div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"120 2","pages":"309 - 332"},"PeriodicalIF":1.1,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-026-00975-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172809","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}