Chemie Der Erde-Geochemistry最新文献

{"title":"Mineralogical and geochemical significance of secondary burial-related barite and celestine: Evidence from Late Paleozoic evaporites in the Karawanke Mountains (Slovenia)","authors":"Aleš Šoster ,&nbsp;Matej Dolenec ,&nbsp;Luna Grum-Verdinek ,&nbsp;Janez Zavašnik","doi":"10.1016/j.chemer.2025.126354","DOIUrl":"10.1016/j.chemer.2025.126354","url":null,"abstract":"<div><div>The evaporites in the Karawanke Mountains (northwestern Slovenia) are hosted in a structurally complex lithological sequence, intercalated between Carboniferous-Permian and Permo-Triassic rocks. These evaporites are primarily composed of gypsum, with minor amounts of anhydrite, dolomite, and barite-celestine. Geochemically, the evaporites are characterized by elevated Sr (2000–2700 mg kg⁻¹) and low Ba (210–400 mg kg⁻¹) contents, reflecting the contrasting solubility behaviors of these elements in low-temperature syngenetic environments. Thermal dehydration, induced by peak burial temperatures ranging from 190 to 260 °C facilitated the transformation of gypsum to anhydrite. Subsequent cooling below the anhydrite stability threshold enabled gradual rehydration, accounting for the coexistence of both minerals. Thermal alteration also mobilized trace elements from the evaporites, which precipitated as secondary celestine and barite through dissolution-reprecipitation mechanisms, producing compositionally zoned fracture infills. The observed zoning, transitioning from Ba-rich to Sr-rich endmembers, likely reflects shifts in temperature, solubility and the chemical reactivity of evaporite-derived brine. Sulfur isotope analyses reveal δ³⁴S values of +11.8 to +13.7 ‰ for the evaporitic sulfates, showing minimal variation and only a small difference relative to coexisting sulfides. This small isotopic offset indicates nearly complete sulfate reduction under high-temperature conditions, consistent with thermal alteration inferred from burial temperatures. These geochemical and isotopic results put forward not only the thermal and diagenetic evolution of the Karawanke evaporites but also their broader significance as minor reservoirs of strontium, a critical element with growing industrial and technological importance.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126354"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Major and trace element geochemistry and Sr–Nd isotopic constraints on mafic volcanic rocks from the Ventura-Espiritu Santo Volcanic Field, San Luis Potosi, Mexico: Petrogenesis and tectonic implications of Cenozoic volcanism in the Basin and Range Province","authors":"Karla R. Hernández Martínez ,&nbsp;Sanjeet K. Verma ,&nbsp;Darío Torres-Sánchez ,&nbsp;Erik Emmanuel M. Torres ,&nbsp;José R. Torres Hernández ,&nbsp;Sonia A. Torres-Sánchez ,&nbsp;Hector Hernández-Mendoza ,&nbsp;Juan Antonio Moreno ,&nbsp;José Manuel Fuenlabrada ,&nbsp;Beatriz A. Rivera-Escoto","doi":"10.1016/j.chemer.2025.126355","DOIUrl":"10.1016/j.chemer.2025.126355","url":null,"abstract":"<div><div>The Ventura Espiritu Santo Volcanic Field (VESVF), located in the central part of the Mesa Central (MC), Mexico, is a monogenetic volcanic field dominated by Late Pleistocene mafic volcanism. It covers an area of approximately 100 km between the localities of Cúcamo and Santa Lucia and is emplaced on a basement composed of metamorphic rocks of the Sierra de Salinas and Triassic marine sequences that are tectonically overlain by the Guerrero Terrane. This study presents new petrographic observations, whole-rock major-and trace-element geochemistry, and Sr-Nd isotopic data for mafic rocks from the Cúcamo, El Rosario, and Santa Lucía areas to constrain the magmatic processes involved in the origin and evolution. Chondrite-normalized REE patterns display moderate enrichment in Light Rare Earth Elements (LREE) accompanied by slight depletion in Heavy Rare Earth Elements (HREE) and absence of an Eu anomaly. Primitive mantle-normalized diagrams show prominent positive anomalies in K, P, and Ti, together with negative anomalies in Pb. The absence of Nb-Ta troughs, together with multidimensional discrimination diagrams, could indicate an affinity to intraplate geochemical signature. Isotopic composition (⁸⁷Sr/⁸⁶Sr_i = [0.70307–0.70353, εNd = +5.8 to +6.3] suggests derivation from an enriched mantle source. The trace-element behavior, supported by geochemical modeling, further indicates that the mafic rocks were generated by low degree of partial melting of the enriched lherzolite upper lithospheric mantle source, pointing to a tectonic environment dominated by lithospheric extension and asthenospheric upwelling.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126355"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear-deformation related Li-Rb-Cs mineralization: The case study from mineral chemistry and 40Ar39Ar ages of phlogopite in the Gaoligong Shear Zone, eastern Tibetan","authors":"Xuanchi Deng ,&nbsp;Xiaofeng Li ,&nbsp;Yiting Zhu ,&nbsp;Heng Xu ,&nbsp;Yong Yu","doi":"10.1016/j.chemer.2025.126365","DOIUrl":"10.1016/j.chemer.2025.126365","url":null,"abstract":"<div><div>Li-Rb-Cs rare metal mineralization is closely linked to highly fractionated granites. However, the origin of Li-Rb-Cs rare metal mineralization during the shear-deformation remains unclear. The Gaoligong Shear Zone (GSZ) is situated along the eastern margin of Tibetan in southwestern China. It is a dextral strike-slip shear zone formed by the northward movement of the India Plate to relative to the Eurasia Plate during Oligocene-Miocene. Bulk mineral composition, together with EMPA and LA-ICP-MS data, reveal that Li-Rb-Cs-rich phlogopite occurs in Carboniferous metamorphic rocks of the GSZ. This phlogopite is enriched in F (4.29–5.06 wt%), Li (1281–1849 ppm), Rb (2550–3242 ppm), and Cs (386–1575 ppm), but depleted in Be (&lt;1 ppm). In contrast, scapolite (marialite) intergrown with the Li-Rb-Cs-rich phlogopites is enriched in Be (31.31–91.34 ppm), and Ga (38.92–48.83 ppm), but poor in Li (1.86–18.71 ppm). Two phlogopite samples yield ⁴⁰Ar<img>³⁹Ar plateau ages of 15.64 ± 0.36 Ma, and 14.44 ± 0.23 Ma, indicating Miocene formation. These ages coincide with major shearing and regional metamorphism in the Gaoligong area. This suggests the formation of Li-Rb-Cs-rich phlogopite may have been related to intense shearing and intracrustal melting. Magma-derived metasomatic hydrothermal fluids may have contributed to the formation of the Li-Rb-Cs-rich phlogopite and the Be-rich scapolite. The study suggests that the Li-Rb-Cs rare metal mineralization can form during the shear deformation and that F-rich phlogopite is a promising indicator for rare-metal exploration in the shear deformation zone.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"86 1","pages":"Article 126365"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145658899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral chemistry of the Gülkonak Fe-Skarn Deposit, Central Anatolia, Türkiye: Implications for ore genesis and mineralization process","authors":"Ayşe Orhan","doi":"10.1016/j.chemer.2025.126357","DOIUrl":"10.1016/j.chemer.2025.126357","url":null,"abstract":"<div><div>The newly discovered Gülkonak Fe-skarn deposit is located in Central Anatolia and lies at the contact zone between the late Cretaceous Behrekdağ granitoid and the late Permian Bozçaldağ marble. The Behrekdağ granitoid is quartz-monzonite – monzonite in composition and contains abundant MMEs of monzonite – monzodiorite composition. Whole-rock and mineral chemistry data suggest that the pluton was associated with subduction in a continental arc setting and derived from crust, mantle, and/or mixed sources. A couple of phases representing different physicochemical conditions in the continental crust for iron mineralization have been identified based on amphibole mineral chemistry. The first phase, which indicates the mixing of mafic-felsic magmas, exhibits relatively high pressure (132–203 MPa), depth (5.0–7.7 km), and temperature (804–871 °C), and moderate-high ƒO₂ (ΔNNO: −0.01 to +0.50) and H₂O content (3.5–4.9 wt%) in the melt. The second phase is the dissolution of Fe-rich liquid, characterized by decreasing pressure (44–45 MPa), depth (1.7 km), temperature (732–736 °C), and H₂O content (3.6–3.9 wt%) and increasing ƒO₂ (ΔNNO: +1.1 to +1.2) conditions.</div><div>Magnetites in Gülkonak Fe deposits occur as massive, irregular lenses and disseminated in the proximal and distal zones. Different types of magnetites were characterized by skarn-type deposit with Ca, Al, Ti, and V contents. Five main stages for skarn formation and mineralization were distinguished in the region: (1) Na-(Ca) alterations consisting mainly of albite (Ab₉₈) and actinolite; (2) prograde stage representing of early-andradite (Grs_0.0–28And_72–100) and diopside (Di_66–95Hed_4–31Joh_0–3) genetically related to mineralization and late-grossular-andradite (Grs_0.00–99.9And_0.1–99.6); (3) retrograde stage consisting of epidote (Ep_57–72Cli_28–43), magnetite, quartz, calcite, and less sulfide (pyrite, chalcopyrite) and chlorite (Mg-chlorite); (4, 5) quartz‑carbonate and supergene stage characterized by quartz, calcite, hematite, goethite, and less siderite, bornite, chalcocite, covellite and malachite.</div><div>These findings suggest that skarn and Fe mineralization are genetically related to the Behrekdağ granitoid. It is suggested that the sudden uplift of Fe-Mg-enriched melt into the shallow continental crust through magma-mixing processes may have promoted extensive dissolution of magmatic fluids. The metasomatic reaction of high-ƒO₂ and Fe³⁺-rich ore-forming fluids with carbonate rocks produced andradite and diopside. It can be stated that the primary mechanisms responsible for the precipitation of metals in Gülkonak skarn deposits are increased pH and decreased temperatures, resulting from the reaction of metals transported as metal chlorides with carbonate rocks.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126357"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluid evolution and ore genesis of the Amensif ZnCu (Pb-Ag-Au) distal skarn deposit (western High Atlas, Morocco): Constraints from fluid inclusions, crush-leach analysis, REY geochemistry, and Pb isotopes","authors":"Larbi Rddad ,&nbsp;Abdessamad Jinari ,&nbsp;Benjamin F. Walter ,&nbsp;Mohsin Raza ,&nbsp;Rachid Benaouda ,&nbsp;El Mostafa Mouguina","doi":"10.1016/j.chemer.2025.126353","DOIUrl":"10.1016/j.chemer.2025.126353","url":null,"abstract":"<div><div>This study investigates the genesis of hydrothermal mineralization at the Amensif Zn<img>Cu (Pb-Ag-Au) ore deposit, hosted within Cambrian carbonates. Three stages of mineralization are identified, beginning with a pre-ore phase characterized by early pyrite precipitation from high-temperature (395–426 °C), highly saline (53.0–59.3 wt% NaCl + CaCl₂) magmatic-hydrothermal fluids under reducing conditions, consistent with a negative Eu anomaly in the Rare Earth Elements and Yttrium (REY) data. Stage I is marked by homogenization temperatures (340–395 °C) and moderate salinities (23.3–24.4 wt% NaCl + CaCl₂), indicating mixing of magmatic and cooler meteoric fluids. Stage II involves cooler (225–260 °C), less saline (17.6–20.4 wt% NaCl + CaCl₂) fluids, indicating dilution with meteoric waters. Principal Component Analysis (PCA) of crush-leach data indicates the involvement of both brine and vapor phases in metal transport and mineralization.</div><div>Lead isotopic and REY data point to a common metal source derived from both mantle and crustal reservoirs, with isotopic uniformity indicating thorough Pb mixing. This aligns with a conceptual metallogenic model in which deep-seated ENE-WSW faults enable magma ascent during post-collision collapse, whereas reactivated NE-SW and NW-SE faults provide pathways for metal-rich magmatic-hydrothermal fluids exsolved from a Permian granitic magma. Fluid mixing and fluid-rock interaction processes facilitated ore deposition in the Cambrian carbonates. These findings provide new insights into the structural and geochemical factors controlling ore genesis at the Amensif deposit and similar magmatic-hydrothermal skarn systems associated with the Hercynian/Variscan orogeny.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126353"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral composition, trace element geochemistry and metallogenic processes of the early Cambrian black rock series-hosted Xiajiadian gold‑vanadium deposit, southern Qinling, China","authors":"Bei Li,&nbsp;Laimin Zhu,&nbsp;Xiao Xiong,&nbsp;Lele Ding,&nbsp;Yuanbo Ma,&nbsp;Shenghao Li,&nbsp;Yang Jiang","doi":"10.1016/j.chemer.2025.126362","DOIUrl":"10.1016/j.chemer.2025.126362","url":null,"abstract":"<div><div>Black rock series are significant in economic geology as they harbor abunbant mineral resources and are often spatially associated with several types of ore deposits. The Xiajiadian deposit is a large-scale, unique Au<img>V co-product system within these series, yet its mineralogy and detailed metallogenic mechanisms remain poorly constrained. This study employs an integrated approach, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron probe micro-analysis (EMPA), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), to systematically determine the mineral composition, trace element geochemistry, and occurrence modes of Au and V.</div><div>The black rock series exhibit a complex mineral assemblage, comprising not only quartz, feldspar, carbonates, and clays but also key ore-related minerals such as barite, roscoelite, anatase, and goethite. Geochemical data reveal significant enrichment of Au, V, Ba, P, and Mo,compared to the upper continental crust. Furthermore, we propose a two-stage metallogenic model: first, a sedimentary/diagenesis and metallogenic stage during which hydrothermal-seawater-microbial interactions led to V enrichment to industrial grades and pre-concentration of Au; subsequently, a tectonic-hydrothermal reformation stage during which pre-enriched Au was remobilized and precipitated to form economic orebodies. Vanadium occurs primarily as V³⁺ in anatase and roscoelite, and in an adsorbed state on goethite and clay minerals. Gold exists predominantly as “invisible gold”, mainly in the form of adsorbed gold (on goethite, illite, kaolinite, and organic matter) and structurally bound Au⁺, with a minor component of nanoparticulate Au⁰. Rare earth element and yttrium (REE + Y) systematics indicate that the ore-forming materials were sourced primarily from the black rock series, which formed in a redox-stratified basin through the mixing of seawater, hydrothermal fluids, and microbial interactions. This two-stage genetic model elucidates the coupled enrichment and differential mobilization of Au and V, providing critical insights for regional exploration.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"86 1","pages":"Article 126362"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145685746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Mesoarchean crustal reworking/recycling and magma underplating process: Insights from the petrogenesis of 3.0–2.9 Ga potassic granitoids in the Anshan area, North China Craton","authors":"Yufei Xuan ,&nbsp;Jin Liu ,&nbsp;Zhenghong Liu ,&nbsp;Wang Ding ,&nbsp;Liqiang Liu","doi":"10.1016/j.chemer.2025.126361","DOIUrl":"10.1016/j.chemer.2025.126361","url":null,"abstract":"<div><div>The evolution and differentiation of early continental crust remain a fundamental research frontier, with potassic granitoids providing critical insights into these processes. This study investigates the petrogenesis and tectonic setting of Late Mesoarchean (3.0–2.9 Ga) potassic granitoids in the Anshan area of the North China Craton (NCC) through comprehensive geochronological, geochemical, and zircon Hf-O isotopic analyses. Zircon U-Pb dating reveals the studied Late Mesoarchean potassic granitoids include <em>ca.</em> 2.95 Ga Tiejiashan biotite monzogranitic-quartz monzonitic gneisses and <em>ca.</em> 3.0 Ga Donganshan monzogranitic gneisses.</div><div>The Tiejiashan potassic granitoids exhibit high SiO₂ (68.47–75.28 wt%), K₂O (4.32–4.93 wt%) contents, K₂O/Na₂O (1.19–1.53) ratios, low Mg# (23–25) values and strongly negative Eu anomalies (δEu = 0.19–0.31), with metaluminous and ferroan affinities, classifying them as A-type granites. Magmatic zircons yield δ¹⁸O values of+4.66 ‰–+6.10 ‰ and ε_Hf(<em>t</em>) values of −10.61 to −6.34, with T_DM² ages of 4.43–3.99 Ga. The geochemical and Hf-O isotope characteristics suggest that Tiejiashan potassic granitoids originated from partial melting of Eo-Paleoarchean TTGs (3.8–3.3 Ga) under shallow crustal conditions. In contrast, the Donganshan monzogranitic gneisses display higher SiO₂ (75.69–76.14 wt%) and peraluminous signatures, with pronounced LREE-HREE fractionation, moderately negative Eu anomalies (δEu = 0.69–0.80) and unradiogenic Hf isotopes (<em>i.e.</em>, ε_Hf(<em>t</em>) values = −0.85–+1.87, T_DM² age = 3.63–3.39 Ga), indicating Donganshan monzogranitic gneisses originated from partial melting of short-residence TTGs with garnet and amphibole residues. The emplacement of these potassic granitoids records a crustal recycling process, while primary magmatic fabrics (<em>i.e.</em> L ≫ S, L = S) in the <em>ca.</em> 2.95 Ga Tiejiashan pluton suggest high-temperature plastic flow linked to magma underplating. These findings highlight a Late Mesoarchean crustal reworking/recycling process of NCC, driven by the remelting of ancient crust due to magma underplating associated with mantle upwelling in an extensional setting.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126361"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Geochemistry of Silurian–Carboniferous sedimentary rocks of the Ulaanbaatar terrane, Hangay–Hentey belt, central Mongolia: Provenance, paleoweathering, tectonic setting, and relationship with the neighbouring Tsetserleg terrane” [Geochemistry (volume 73, issue 4) 481–493]","authors":"Narantuya Purevjav ,&nbsp;Barry Roser","doi":"10.1016/j.chemer.2025.126358","DOIUrl":"10.1016/j.chemer.2025.126358","url":null,"abstract":"","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"85 4","pages":"Article 126358"},"PeriodicalIF":2.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineralogy, geochemistry and genesis of newly discovered Sinandede kaolin deposit (Balıkesir, NW Türkiye): Potential applications","authors":"Fazlı Çoban ,&nbsp;Şenel Özdamar ,&nbsp;Oral Sarıkaya ,&nbsp;Gökhan Büyükkahraman ,&nbsp;Zeynep Döner ,&nbsp;Naşide Merve Sütçü","doi":"10.1016/j.chemer.2025.126364","DOIUrl":"10.1016/j.chemer.2025.126364","url":null,"abstract":"<div><div>This paper presents first X-ray diffraction (XRD), scanning electron microscopy (SEM), bulk-rock geochemical analyses, isotopic (O-H-C) and differential thermal analysis-thermogravimetric (DTA-TG), physical and thermal tests of Sinandede kaolin deposit (SKD) formed by hydrothermal alteration of Lower Miocene dacitic-rhyodacitic tuffs. The mineralogical analyses revealed that the SKD comprises mainly kaolinite with dickite, illite, smectite-chlorite, Ca-montmorillonite, alunite, halloysite, feldspar, quartz, opal CT, hematite and anhydrite. Geochemically, Al₂O₃, H₂O, Sr, S and Zr contents were markedly enriched, while Rb, Cs, U, Y and Ba were depleted compared with the parent rocks. The chondrite-normalized rare earth element (REE) patterns show identical trends characterized by light rare earth element (LREE) enrichment (La/Sm)_CN = 1.96–10.96 and (La/Yb)_CN = 20.51–37.08), heavy rare earth element (HREE) depletion (Gd/Yb)_CN = 1.37–5.62), slightly Eu anomaly (Eu/Eu* &lt;1), and positive Gd anomaly (Gd/Gd* = av.1.06). The δ¹⁸O values of the samples vary between +0.48 ‰ and, −4.96 ‰; δD values vary between −81.05 ‰ and − 89.97 ‰. On the other hand; δ¹³C (VPDB) values ranging between −25.70 ‰ and − 28.83 ‰ (VPDB) in kaolin samples are compatible with the δ¹³C (VPDB) values of hydrothermal waters mixed with meteoric water fed by C3 plants, indicating the contribution of meteoric water in SDK. Small positive Ce and Gd anomalies, which indicates the presence of a hypogene-supergene mix, further support the contribution of meteoric water. The SDK was formed as a result of post-magmatic hydrothermal activities at temperatures above 100 °C and influenced by both hypojene and supergene conditions. Technological tests suggest that the SDK can be used for wall and floor tiles in ceramic industry.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"86 1","pages":"Article 126364"},"PeriodicalIF":2.9,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145658900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New geochemical and geochronological findings from the Mesozoic ophiolites and marine rock sequences in the Tauride ribbon continent (southern Turkiye) and implications for the evolution of the Inner - Tauride and Pindos (Greece) seaways within the Mesozoic Neotethys","authors":"Ender Sarifakioglu ,&nbsp;Alican Ozturk ,&nbsp;Yıldırım Dilek ,&nbsp;Bilgehan Yabgu Horasan ,&nbsp;Tamara Bayanova ,&nbsp;Mustafa Sevin ,&nbsp;Muhammed Çoban ,&nbsp;Dmitry Elizarov","doi":"10.1016/j.chemer.2025.126356","DOIUrl":"10.1016/j.chemer.2025.126356","url":null,"abstract":"<div><div>Ophiolites exposed in the Konya region of south-central Anatolia play an important role in understanding the distribution of Neotethyan suture zones and paleogeography in the eastern Mediterranean region. The Dipsizgöl ophiolites consist mainly of upper mantle peridotites, rare ultramafic cumulates, and microgabbro – diabase dykes that locally crosscut the peridotites. Basaltic rocks of the Dipsizgöl ophiolite and the Huğlu Unit display P-MORB composition affected by subduction-affected melts. The Huğlu Unit developed in a continental back-arc setting within the Tauride ribbon continent during the Middle-Late Triassic through Cretaceous. The Dipsizgöl ophiolite is geochemically similar to the ophiolites derived from the Pindos back-arc basin, which opened between the Dinaride–Hellenide microcontinent and the Pelagonia Platform to the west during the Late Triassic. A diabase dyke from the Dipsizgöl ophiolite revealed a Rb–Sr whole-rock isochron age of 183 ± 69 Ma. Although we take into account the possibility of errors arising from processes within the system or external factors, this data indicates that the oceanic basin existed between the Lower Triassic to the latest Lower Cretaceous. This intra-continental back-arc basin was likely part of the Southern Inner-Tauride Ocean (SITO), which constituted the eastern equivalent of the Mesozoic Pindos ocean farther west. The Hatip-Çağırbağı, Yükselen, Yunak, Çeşmelisebil and Altınekin ophiolites in the Anatolides exhibit geochemical characteristics of back-arc to fore-arc environments, and represent the remnants of the Mesozoic Northern Inner-Tauride Ocean (NITO). The U<img>Pb zircon dating of a shoshonitic mafic dyke that crosscuts the Altinekin ophiolitic mélange revealed a 70–85 Ma crystallization age, which is interpreted as the timing of the development of an immature volcanic arc. With the opening of the Neotethys in the late Permian, the Apulian microcontinent, which comprised the Dinaride–Hellenide–Tauride carbonate platforms, broke away from the Gondwana continent and drifted northwards. The Pindos basin was a separate seaway in Neotethys and opened within the Apulian microcontinent in the early? Triassic and closed in the Late Cretaceous–Early Paleocene.</div></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"86 1","pages":"Article 126356"},"PeriodicalIF":2.9,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145685747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}