Lithos最新文献

{"title":"Altered zircon from Ontario, Canada – An investigation from microscale to nanoscale","authors":"Fabian Tramm ,&nbsp;Richard Wirth ,&nbsp;Bartosz Budzyń ,&nbsp;Grzegorz Rzepa ,&nbsp;Gabriela A. Kozub-Budzyń ,&nbsp;Jiří Sláma ,&nbsp;Piotr Jeleń ,&nbsp;Vladimir Roddatis ,&nbsp;Anja Schreiber ,&nbsp;Milan Novák","doi":"10.1016/j.lithos.2025.108375","DOIUrl":"10.1016/j.lithos.2025.108375","url":null,"abstract":"<div><div>Heavily altered zircon grains from a pegmatite from Ontario (Bancroft, Canada) were investigated using multiple microanalytical methods (EPMA, LA-ICPMS, Raman microspectroscopy), together with TEM and electron energy loss spectroscopy (EELS). The microscale study involved compositional and geochronological analyses, structural estimation, which was followed by investigation of selected textural domains at the nanoscale. The zircon grains display four distinct textural domains, which are: dom1 – primary, oscillatory zoned zircon; dom2 – zircon containing a fine network of cracks and faint oscillatory zoning; dom3 – secondary zircon, which follows former zoning or forms “finger-like” textures; and dom4 – heterogeneous, patchy zoned and microporous zircon containing numerous microinclusions. Compositional signatures indicate an igneous origin of dom1 and dom2, supported by concordant ages of ca. 1064 Ma. The dom3 and dom4 indicate hydrothermal origin, based on textural features caused by fluid-induced alteration that occurred in the Triassic as constrained by lower intercepts (240 ± 48 Ma and 197 ± 120 Ma) of discordant age data. At the nanoscale, primary zircon in dom1 displays an overall amorphous texture with finely distributed nanocrystals due to complete metamictization. Zircon in dom2 demonstrates a homogeneous crystalline structure, but with a moderate degree of radiation-damage. The secondary zircon of the dom3 finger-like textures is the result of multiple fluid-induced alteration mechanisms with fluids that followed primary zoning or fractures as pathways. The patchy zoned zircon in dom4 shows sharp nanoscale transitions with accumulation of U in bright patches, and accumulation of metallic Pb in dark patches, resulting in disturbed U and Pb signatures. The combination of microanalytical methods together with TEM enabled the reconstruction of the recorded history in the altered zircon grains. The presented nanotextures provide new insights important in the investigations of altered zircons from pegmatite and other metasomatically overprinted environments.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108375"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797996","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":"Contrasting signatures of Phanerozoic I-type magmas proxy non-oceanic subduction crustal formation at the Archean–Proterozoic transition","authors":"Daniel Gómez-Frutos","doi":"10.1016/j.lithos.2025.108374","DOIUrl":"10.1016/j.lithos.2025.108374","url":null,"abstract":"<div><div>Active margins are widely recognised as the main contributors to continental growth via I-type magmatism. The two constituent suites, namely subduction and post-collisional magmas, record the exchange of mass between the crust and the mantle through geological time. However, their geochemical similarities and the existing controversies over their igneous sources hinder their usage to track crustal evolution, as well as proxies for early continental crust formation during the Archean-Proterozoic transition. In spite of their geochemical similarities, compositional data from a global compilation of I-type magmas indicate consistent differences in their major and trace element compositions (CaO, MgO, K₂O, La/Sm and Ba/Th). Subduction-related magmas are characterised by higher CaO and lower K₂O, consistent with derivation from an ocean–mantle source. In contrast, post-collisional magmas display higher K₂O and elevated incompatible element abundances, reflecting a hybrid continental–mantle lithospheric source. Comparisons with Archean sanukitoid magmas highlight striking geochemical similarities to Phanerozoic post-collisional magmas, pointing to analogous igneous sources. Together with their resemblance of the bulk composition of the continental crust, this suggests that crust–mantle hybridisation, rather than oceanic subduction, was the dominant process driving crustal evolution at the Neoarchean–Proterozoic transition.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108374"},"PeriodicalIF":2.5,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839982","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":"Petrogenesis of the Kalaymyo Ophiolite: Insights into mantle-melt interaction and tectonic transition from mid-ocean ridge to supra-subduction zone setting in the eastern Neo-Tethys","authors":"Gyuseung Park ,&nbsp;Chul-Ho Heo ,&nbsp;Sun Ki Choi ,&nbsp;Seunghee Han ,&nbsp;Jonguk Kim ,&nbsp;Mi Jung Lee","doi":"10.1016/j.lithos.2025.108373","DOIUrl":"10.1016/j.lithos.2025.108373","url":null,"abstract":"<div><div>The collision between the Indian plate and the West Burma Block led to the formation of Neo-Tethyan ophiolite along the Western Ophiolitic Belt (WOB). The ophiolitic rocks in the WOB exhibit geochemical characteristics of both mid-ocean ridge (MOR) and supra-subduction zone (SSZ) settings, implying a complex geodynamic evolution. However, the processes responsible for such diverse geochemistry remain a topic of debate. This study investigates the petrogenesis of podiform chromitite and associated peridotite in the Kalaymyo ophiolite, located in the central WOB, through petrography, mineral and whole-rock geochemistry, and geochemical modeling. Five groups with distinct textures and chemical compositions are noticed: Group 1, Group 2, and plagioclase spinel (Pl-Spl) peridotite, dunite, and chromitite. Group 1 peridotite represents residual mantle in MOR settings, as shown by its geochemical similarity with the modern abyssal peridotite and partial melting modeling. Pl-Spl peridotite, containing intergranular plagioclase, is characterized by elevated HREE contents in clinopyroxene and high Ti in spinel, suggesting localized MORB-like melt impregnation. Dunite and chromitite display enrichment of incompatible elements in clinopyroxene and chromite with high oxygen fugacity value, collectively suggesting their formation in SSZ environments. Clinopyroxene oikocryst in chromitite is comparable to that of modern island-arc tholeiite with relative Ba enrichment and Nb depletion, further supporting its SSZ origin. Group 2 peridotites record the intermediate stages of the melt-mantle interaction including hydrous melting and reactive melt percolation under SSZ settings, as supported by intermediate chemical composition, amphibole inclusions, and melt-mantle interaction modeling. We propose that the coexistence of MOR-type and SSZ-type lithologies in the Kalaymyo ophiolite reflects in-situ tectono-magmatic transition rather than tectonic juxtaposition via mélange formation. This interpretation is supported by transitional variations in lithology and geochemistry and the spatial association of SSZ-type rocks with dunite and podiform chromitite bodies.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108373"},"PeriodicalIF":2.5,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748383","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":"The behavior of Se and Te during porphyry Cu-associated magmas evolution in the Middle-Lower Yangtze River metallogenic belt: Implications for Se and Te enrichment in porphyry Cu systems","authors":"Yilun Jin ,&nbsp;Guiqing Xie ,&nbsp;Jingwen Mao ,&nbsp;Zhaochong Zhang","doi":"10.1016/j.lithos.2025.108364","DOIUrl":"10.1016/j.lithos.2025.108364","url":null,"abstract":"<div><div>Porphyry Cu systems are the major source of critical metals such as Se and Te; however, the factors controlling Se and Te enrichment during the evolution of porphyry Cu-associated magmas remain poorly understood. Here, we present new whole-rock major and trace element (including Se, Te, and platinum-group elements) and Sr<img>Nd isotope data for gabbros and granitoids associated with Se- and Te-rich porphyry-skarn Cu deposits in the Daye and Jiurui ore districts, Middle-Lower Yangtze River metallogenic belt, Eastern China. New and published whole-rock geochemistry data collectively demonstrate that these rocks are comagmatic and formed through fractional crystallization of primitive magmas derived from a subduction-metasomatized mantle source. Whole-rock Pd and Pt (&lt;0.5–0.82 ng/g and &lt; 0.1–0.19 ng/g, respectively) concentrations are significantly lower than those of primitive arc magmas, yet comparable to sulfide-saturated arc magmas, including porphyry Cu-associated systems, at similar MgO. Numerical modeling indicates that segregation of ∼0.3 wt% of monosulfide solid solution (MSS)-dominated sulfide during magma differentiation can reproduce the observed Pd abundances. Extending this modeling framework to Se and Te suggests that, under oxidized conditions [ΔFMQ (<em>f</em>_O2 values relative to the fayalite–magnetite–quartz buffer) = +1 to +1.5], early MSS-dominated saturation exerts only limited impact on their behavior. By the time of fluid exsolution, Se and Te concentrations in oxidized, sulfide-saturated magmas may exceed those in reduced systems (ΔFMQ &lt; −1.3) by up to an order of magnitude. However, whole-rock Se and Te concentrations (&lt;20–68 ng/g and &lt; 1–7.2 ng/g, respectively) are markedly lower than modeled values at comparable MgO and exhibit decreasing Se/Pd and Te/Pd (fluid-mobile/fluid-immobile) with declining Se and Te. These obeservations indicate that late-stage fluid exsolution can significantly deplete Se and Te from the residual melt. Elevated magmatic <em>f</em>_O2 ensures that sufficient Se and Te remain in the melt at the onset of fluid saturation, thereby allowing the exsolution of Se- and Te-rich fluids, while the fluid reservoir is dominated by magmatic H₂O. Magmas associated with the Daye and Jiurui porphyry-skarn Cu deposits have been reported to be both oxidized and H₂O-rich, which together may account for their significant Se and Te endowments.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108364"},"PeriodicalIF":2.5,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748382","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":"Archean TTGs and high-K granitoids from the Madawara domain, Southern Bundelkhand Craton: Insights into petrogenesis, crustal growth, and mantle metasomatism","authors":"Pradip Kumar Singh ,&nbsp;Ajay Kumar ,&nbsp;Balaram Sahoo ,&nbsp;Kumar Batuk Joshi ,&nbsp;Sanjiv Kumar ,&nbsp;Debajyoti Paul ,&nbsp;Elson P. Oliveira ,&nbsp;Dakshita ,&nbsp;Vinod Kumar Singh ,&nbsp;Arvind Kumar Gond ,&nbsp;Archana Nikita Kispotta ,&nbsp;Ishwar Chandra Rahi ,&nbsp;Ramesh Chandra Patel","doi":"10.1016/j.lithos.2025.108363","DOIUrl":"10.1016/j.lithos.2025.108363","url":null,"abstract":"<div><div>We present an integrated study combining field observations, petrography, mineral chemistry, whole-rock geochemistry, of tonalite–trondhjemite–granodiorites (TTGs), sanukitoids, high-K granitoids and U-Pb geochronology of a high-K granitoid from the Madawara domain, Southern Bundelkhand Craton. Zircon of a high-K granitoid yields a U–Pb emplacement age of 2.47 Ga, marking the terminal phase of Archean magmatism as well as crustal stabilization in the craton. The TTGs exhibit adakitic signatures with low to moderate Sr/Y (8–88) and (La/Yb)_CN (15–30) consistent with garnet-amphibolite melting, while negative Eu anomalies suggest plagioclase fractionation or residual source effects.</div><div>This study provides the first account of sanukitoids from the southern Bundelkhand Craton, revealing their limited occurrence and highlighting their association with shear zones and granite–greenstone sequences in the Madawara domain. The low-Ti sanukitoids (TiO₂ = 0.59–0.63 wt%) display a hybrid mantle-crustal affinity, with elevated Mg# (60–66), Ba+Sr (1198–1261), Cr-Ni-V concentrations, indicative of metasomatized mantle sources. The results support a model of TTG melt-peridotite interaction followed by shallow-level homogenization. Their sporadic distribution suggests formation in a microplate tectonic regime with warm, shallow subduction. The high-K granitoids (SiO₂ = 72–75 wt%) are characterized by low Mg# (16–31), Sr (9–123 ppm) with pronounced negative Eu and Ti anomalies, indicating a purely crustal origin. They also display enriched light rare earth elements, sharp negative Eu anomalies, and relatively flat heavy rare earth elements patterns, consistent with A-type granite characteristics. Our findings bridge the compositional gap between TTGs and high-K granites, documenting the transition from primitive Archean geodynamics to modern-style plate interactions. This study advances the petrogenetic framework for late-Archean granitoids, offering new insights into crust-mantle processes during craton stabilization.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108363"},"PeriodicalIF":2.5,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749370","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":"Evidence of heterogeneity in the mantle source of Quaternary Naozhou Island basalts from REEs and Sr-Nd-Pb isotopes","authors":"Cui Xiao-Ge ,&nbsp;Li Zhi-Hua ,&nbsp;Xie Shi-Xiong ,&nbsp;Yang Wen-Jian ,&nbsp;Wang Ming-Qiu ,&nbsp;Cheng Liu-San ,&nbsp;Gao Cai-Xia ,&nbsp;Jiang Hong-Liang","doi":"10.1016/j.lithos.2025.108372","DOIUrl":"10.1016/j.lithos.2025.108372","url":null,"abstract":"<div><div>Integrated studies of trace-element and isotopic compositions in basalts can be used to investigate the mantle source heterogeneity and constrain the magma compositions of ocean-island basalt (OIB) -type basalts. In this study, we analyze the major and trace elements in the Naozhou Island basalts and present new Sr-Nd-Pb isotopic data to identify the recycled materials in the source and elucidate the origin of the basalts. Quaternary basalts from the Naozhou Island are predominantly tholeiitic. The Sr, Nd, and Pb isotopic compositions clustered around the depleted mantle (DM)- enriched mantle II (EM2) mixing trends indicate that the Naozhou Island basalts originated from a mixed source involving DM and EM2 components. Comparisons of major and trace element parameters (e.g., FeO/CaO − 3 × MgO/SiO₂ (FC3MS) values, Zn/Fe and Zn/Mn ratios), as well as CaO contents in estimated primary magma with experimental peridotite melt suggest that the source lithologies in this region necessitate contributions from both silica-deficient pyroxenite and peridotite. The Naozhou Island basalts exhibit elevated Sr_N/Sr* (&gt;1) and Eu_CHUR/Eu* (&gt;1) ratios, and the (Th/Nb)_N and ²⁰⁷Pb/²⁰⁴Pb values surpass those of the igneous oceanic crust (IOC), indicating the presence of recycled oceanic crust (ROC) and recycled sediment (RS) in their source. Quantitative Nd<img>Pb isotopic mixing model suggests that the mantle source heterogeneity recorded in the Naozhou Island basalts requires the involvement of three mantle end-members: DM, ROC, and a small amount of RS. A rare earth element (REE) modeling method applied in this study shows that the (La/Sm)_N and (Dy/Yb)_N ratios of the Naozhou Island basalts can be generated by mixing of peridotite-derived melts (F ≈ 0–1 %) and pyroxenite-derived melts (F ≈ 20–25 %). Our findings provide insights into the role of recycled materials in mantle heterogeneity of the Naozhou Island basalts, the REE modeling method further offers trace-element constraints on magma compositions, which are applicable not only to the Naozhou Island basalts but also to basalts throughout the Leiqiong Volcanic Area.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108372"},"PeriodicalIF":2.5,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749369","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":"Late Cretaceous granitic magmatism and W-Sn mineralization in Northeast Vietnam: similarity and differences with SW South China","authors":"DinhLuyen Nguyen ,&nbsp;Rucheng Wang ,&nbsp;Jinhai Yu ,&nbsp;Xiao-Lei Wang ,&nbsp;TrungHieu Pham ,&nbsp;Truong Xuan Le ,&nbsp;Lang Xia ,&nbsp;VanNam Pham","doi":"10.1016/j.lithos.2025.108362","DOIUrl":"10.1016/j.lithos.2025.108362","url":null,"abstract":"<div><div>Northeast Vietnam hosts Late Cretaceous granitic magmatism and genetically related W-Sn mineralization. Detailed zircon U-Pb analyses indicate that the Thien Ke granites were formed at 89–87 Ma and the Da Lien granites formed at 89–88 Ma, making them synchronous with the Pia Oac granites in NE Vietnam and numerous Late Cretaceous granites in Southwest South China. Cassiterite U-Pb dating constrains a later mineralization age of ∼82 Ma for Thien Ke W deposit, implying <em>ca</em> 5–7 Myr evolution from high-temperature magmatism to low-temperature mineralization. In contrast, the formation of the Nui Phao W-polymetallic deposit was nearly synchronous with the intrusion of the Da Lien granite, consistent with high-temperature mineralization. These granites have high A/CNK (&gt;1.1), K₂O/Na₂O, Rb/Sr and Rb/Ba, low CaO/Na₂O ratios (&lt;0.3) and variable zircon Hf isotopic compositions (Ԑ_Hf(t) = −6.0 to −14.2), characteristic of S-type granites. Integrating the geochemical and Hf-isotope compositions of the basement metamorphic rocks confirms that Late Cretaceous granites in NE Vietnam originated from partial melting of Neoproterozoic metapelitic sedimentary rocks. Although the Late Cretaceous granites in NE Vietnam have similar S-type granitic geochemistry, crystallization ages and associated rare-metal deposits to those in SW South China, the latter exhibit greater bulk-compositional complexity, extended formation durations and contrasting deposit types. Late Cretaceous granites in NE Vietnam are generally associated with W-polymetallic mineralization, whereas those in SW South China are associated with giant Sn-polymetallic mineralization. The differences in deposit type between the two regions are attributed to the different Sn and W abundances and rock types (pelitic/psammitic) of their sources and different melting conditions. The high-temperature melting of psammitic sources with high Sn abundances in SW South China generated Sn-rich magmas, whereas low-temperature melting of pelitic sources with high W abundances in NE Vietnam led to the production of W-rich melts.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108362"},"PeriodicalIF":2.5,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748379","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":"Equilibrium tellurium isotope fractionation in tellurides: A first-principles study","authors":"Jiaxin Liang ,&nbsp;Yang Zhao ,&nbsp;Huiquan Tian ,&nbsp;Shanqi Liu ,&nbsp;Yongbing Li","doi":"10.1016/j.lithos.2025.108355","DOIUrl":"10.1016/j.lithos.2025.108355","url":null,"abstract":"<div><div>Tellurium is a critical metal that is highly concentrated in tellurides, which also serve as important hosts of gold, silver, and platinum-group elements. Understanding the stable isotopic behavior of Te in tellurides is crucial not only for elucidating the formation and evolution of Te-bearing hydrothermal ore systems but also for constraining the genetic mechanisms of gold deposits. However, Te isotope fractionation in tellurides remains poorly characterized and inadequately understood. In this study, first-principles calculations were used to determine Te isotope fractionation between tellurides and native tellurium. The reduced partition function ratios of ¹³⁰Te/¹²⁵Te are found to decrease in the following order: frohbergite (FeTe₂) &gt; mattagamite (CoTe₂) &gt; vulcanite (CuTe) &gt; pampaloite (AuSbTe) &gt; petzite (Ag₃AuTe₂) &gt; melonite (NiTe₂) &gt; sylvanite (AuAgTe₄) ≥ coloradoite (HgTe) ≥ stützite (Ag₅Te₃) &gt; krennerite (Au₃AgTe₈) &gt; hessite (Ag₂Te) &gt; calaverite (AuTe₂) ≥ montbrayite (Au₂Te₃) &gt; tellurantimony (Sb₂Te₃) ≥ skippenite (Bi₂Se₂Te) ≥ Joséite-A (Bi₄TeS₂) &gt; tellurobismuthite (Bi₂Te₃) &gt; native tellurium ≥ tsumoite (BiTe) &gt; altaite (PbTe). The <em>β</em>₁₃₀_–₁₂₅ factors of tellurides show a weak correlation with Te coordination number, but they exhibit a negative correlation with the average length of chemical bonds formed by Te when minerals are grouped by Te coordination number and oxidation state. Our results provide a theoretical basis for determining whether isotopic equilibrium has been achieved in natural samples and enable more accurate interpretations of variations in Te isotopic compositions. This, in turn, advances our understanding of the formation and evolution of gold-telluride deposits.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108355"},"PeriodicalIF":2.5,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840407","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":"Pressure-temperature stability and equation of state of staurolite: Implications for the water transport during cold slab subduction","authors":"Shijie Huang ,&nbsp;Jingui Xu ,&nbsp;Dongzhou Zhang ,&nbsp;Shanrong Zhang ,&nbsp;Yufeng Liu ,&nbsp;Yikui Liang ,&nbsp;Zimo Li ,&nbsp;Wenge Zhou ,&nbsp;Dawei Fan","doi":"10.1016/j.lithos.2025.108361","DOIUrl":"10.1016/j.lithos.2025.108361","url":null,"abstract":"<div><div>The stability and thermal equation of state (EoS) of synthetic staurolite were investigated under high pressure and temperature (<em>P–T</em>) conditions up to ∼23 GPa and 850 <em>K. no</em> phase transition was observed within the experimental <em>P–T</em> range. The thermal EoS parameters, including the bulk modulus, pressure and temperature derivatives, and thermal expansion coefficient, were determined by fitting the pressure–volume–temperature data to high-temperature third-order Birch–Murnaghan EoS. Integrating the results of this study with those of previous studies led to an updated <em>P–T</em> phase diagram for staurolite. This diagram suggests that staurolite may have potential metastability extending to the depth of the Earth's mantle. The density and bulk sound velocity profiles along the Tonga slab geotherm indicate that staurolite could serve as an effective water carrier to sub-arc mantle depths. Notably, staurolite exhibits higher bulk sound velocities than most hydrous minerals do, implying that its presence in medium- to high-pressure metamorphic rocks may increase seismic velocities in corresponding lithologies.</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108361"},"PeriodicalIF":2.5,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748380","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":"The Vitória dike swarm – A key piece in the puzzle of low-Ti tholeiitic magmatism of the South Atlantic Magmatic Province","authors":"Antomat A. Macêdo Filho ,&nbsp;Valdecir A. Janasi ,&nbsp;Alisson L. Oliveira ,&nbsp;Elton L. Dantas ,&nbsp;Dawid Szymanowski ,&nbsp;Lucas M. Lino ,&nbsp;Mário Neto Cavalcanti de Araújo ,&nbsp;Maria Helena Hollanda","doi":"10.1016/j.lithos.2025.108360","DOIUrl":"10.1016/j.lithos.2025.108360","url":null,"abstract":"<div><div>During the Early Cretaceous, widespread tectono-magmatic activity along the South Atlantic Rift System led to the development of a complex system of sedimentary basins accompanied by basaltic, silicic, and alkaline magmatism. In the northern Mantiqueira Province (Espírito Santo, Brazil), the Vitória–Ecoporanga belt marks an intensely fractured/faulted NW–SE structural belt that hosts the Vitória dikes, representing the northernmost mafic dike swarm of the Paraná–Etendeka Magmatic Province (PEMP). The dikes are microgabbros composed of plagioclase, clinopyroxene, and Fe<img>Ti oxides, with MgO contents of 3.8–7.2 wt% and total alkalis of 2.4–4.8 wt%, consistent with subalkaline/tholeiitic basaltic compositions. They display enrichment in large-ion lithophile elements and pronounced negative Nb<img>Ta anomalies relative to Rb, Ba, U, Th, K, La, Ce, and Pb. Isotopic compositions show variable ⁸⁷Sr/⁸⁶Sr_(i) (0.70575–0.70994), εNd_(i) (−11.4 to −0.95), and heterogeneous Pb isotopic ratios (²⁰⁶Pb/²⁰⁴Pb = 16.7–18.2; ²⁰⁷Pb/²⁰⁴Pb = 15.4–15.6; ²⁰⁸Pb/²⁰⁴Pb = 37.6–38.9). K<img>Ar and ⁴⁰Ar/³⁹Ar data constrain the emplacement to the Early Cretaceous. Comparative geochemical, isotopic, and geochronological data reveal strong affinities between the Vitória and Riacho do Cordeiro dikes of the Equatorial Atlantic Magmatic Province (EQUAMP). These similarities indicate that both systems share a common evolutionary history, representing remnants of a possibly interconnected low-Ti tholeiitic magma plumbing system active during the early stages of West Gondwana breakup. Comparable compositional affinities are also recognized in other low-Ti tholeiites across the PEMP and EQUAMP. Collectively, this transcontinental low-Ti tholeiitic event represents the earliest stage of the South Atlantic Magmatic Province (SAMP).</div></div>","PeriodicalId":18070,"journal":{"name":"Lithos","volume":"522 ","pages":"Article 108360"},"PeriodicalIF":2.5,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692721","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}