Ore Geology Reviews最新文献

{"title":"High-temperature uranium mineralization in the Jiling Na-metasomatism uranium deposit, northwest China: Evidence from the isotope and element of rutile and apatite","authors":"Xin-Yi Zhou ,&nbsp;Kai-Xing Wang ,&nbsp;Chi-Da Yu ,&nbsp;Gui Wang ,&nbsp;Xiao-Dong Liu ,&nbsp;Wei Wang ,&nbsp;Li-Qiang Sun ,&nbsp;Wen-Heng Liu","doi":"10.1016/j.oregeorev.2026.107118","DOIUrl":"10.1016/j.oregeorev.2026.107118","url":null,"abstract":"<div><div>The Jiling uranium deposit in Northwest China, which was previously considered a low-temperature system, presents evidence of high-temperature mineralization at depth. Petrographic analysis, elemental composition, and U–Pb dating of <em>syn</em>-ore hydrothermal rutile and apatite from this deposit were investigated in this study. Three distinct rutile types, each of which formed from a different precursor mineral, were identified: Rt-1 from altered Ti-rich magnetite, Rt-2 from ilmenite, and Rt-3 from biotite. These hydrothermal rutile types are contemporaneous with uraninite and apatite in the deposit. The three rutile types exhibit distinct rare earth element (REE) patterns. Rt-1 has a low REE content with light rare earth element (LREE) enrichment, and Rt-2 has a high REE content with a flat pattern. In contrast, Rt-3 shows an LREE-enriched pattern. These variations suggest that the REE signature of each rutile type is inherited from its precursor minerals. Furthermore, all three rutile types are enriched in high-field-strength elements (HFSEs). This enrichment was likely driven by the high-temperature, halogen- and CO₂-bearing magmatic fluids responsible for their formation. In situ U–Pb isotope dating of hydrothermal rutile and apatite yields weighted mean ages of 432 ± 6 Ma and 435 ± 3 Ma, respectively. This study demonstrates that rutile and apatite can be used as robust tool for tracing uranium mineralization.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107118"},"PeriodicalIF":3.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039410","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":"Magmatic evolution and chromite mineralization in the Gayahe ultramafic Complex, East Kunlun orogenic Belt, western China","authors":"Wen-Qi Ren ,&nbsp;Shao-Yong Jiang ,&nbsp;Hailin Xie ,&nbsp;Bin Wang ,&nbsp;Wei Wang ,&nbsp;Hui-Min Su","doi":"10.1016/j.oregeorev.2026.107125","DOIUrl":"10.1016/j.oregeorev.2026.107125","url":null,"abstract":"<div><div>Integrating chromite–silicate geochemistry with apatite U–Pb geochronology, this study deciphers the magmatic evolution and chromite mineralization of the Gayahe ultramafic complex in the East Kunlun Orogenic Belt. Newly identified massive chromitites occur within serpentinite, dunite, olivine pyroxenite, and pyroxenite. Apatite U–Pb dating yields an age of 430 ± 17 Ma, placing their formation in the Early Silurian during a major pulse of mantle-derived magmatism. Chromite from massive chromitite is characterized by high Cr# (70.2–80.6), low TiO₂, and trace-element patterns marked by relative Zn–Co–Mn enrichment and pronounced Sc depletion, indicating crystallization from a low-Ti parental melt consistent with forearc boninitic magmatism. Systematic contrasts among chromite types show that re-equilibration chiefly overprinted low-modal-abundance chromite in serpentinite and other ultramafic host rocks, whereas the multivalent-element chemistry of chromite from massive chromitite samples preserves near-primary melt signatures. Coexisting olivine shows high Mg# and Ni contents, consistent with crystallization from a depleted mantle-derived melt. Field, petrographic, and geochemical evidence collectively indicates that the Gayahe chromitite formed in an Early Silurian subduction-related arc setting, where chromite–silicate crystal-mush accumulation followed by gravitational settling generated the massive chromitite layers. These findings refine the petrogenesis of the Gayahe ultramafic complex and establish a geochemical framework for identifying high-Cr chromitite associated with boninite-series magmatism in comparable orogenic belts.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107125"},"PeriodicalIF":3.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039414","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":"Unveiling hydrothermal center in the Xiayu Ag-Pb-Zn-Au Orefield, central China: Insights from geology evidence and ore grade characteristic","authors":"Lei Zhu ,&nbsp;Min Liu ,&nbsp;Xiuquan Wang ,&nbsp;Wei Jian ,&nbsp;Jingwen Mao ,&nbsp;Yongfei Tian ,&nbsp;Li Jiang ,&nbsp;Yongqi Su","doi":"10.1016/j.oregeorev.2026.107116","DOIUrl":"10.1016/j.oregeorev.2026.107116","url":null,"abstract":"<div><div>The Xiayu orefield, situated within the Xiong’ershan ore concentration area of the southern margin of the North China Craton, is an important polymetallic production region. Recent studies suggest that the steeply dipping Ag-Pb-Zn-Au veins belong to a magmatic-hydrothermal system related to unexposed intrusions. The hydrothermal center and associated metal zoning, however, remain unclear. Addressing these knowledge gaps is essential for elucidating ore-forming processes and refining regional exploration strategies. This study addresses these issues through a statistical analysis of 436,003 ore grades, integrated with field and petrographic investigations. Our results reveal clear patterns of metal zoning that show a hydrothermal center is located under the southwestern part of Haopinggou deposit in the Xiayu orefield. Samples from this orefield clearly exhibit six paragenetic stages, in which sphalerite precipitation was followed by gold and lead mineralization, which in turn preceded the formation of chalcopyrite and argentite, with native silver occurring in the final stage. Based on these stages, we employed characteristic metal ratios to provide evidence for elemental zonings: Au/Ag, Zn/Ag, and Pb/Ag ratios increase toward the southwestern Haopinggou deposit. These variations reflect the sequential deposition of ore minerals, which is jointly governed by mineralization stages, decreasing temperature gradients, and intensifying fluid-rock interaction distal to the hydrothermal center. The observation aligns with the geological features of the Xiayu orefield, specifically the presence and spatial configuration of breccia pipes. This interpretation is further substantiated by a synthesis of existing fluid inclusion information, hydrothermal alteration assemblages, and geochronological constraints. These findings demonstrate the utility of statistical analysis methodologies in mineral exploration, providing a robust framework for identifying hydrothermal centers and delineating exploration targets.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107116"},"PeriodicalIF":3.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039368","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":"Genesis of the Linghou Cu–Zn polymetallic deposit, South China: Constraints from geological, mineralogical, geochronological and sulfur isotope data","authors":"Wei Zheng ,&nbsp;Kelei Chu ,&nbsp;Bo Xing","doi":"10.1016/j.oregeorev.2026.107121","DOIUrl":"10.1016/j.oregeorev.2026.107121","url":null,"abstract":"<div><div>Stratiform Cu deposits represent significant source of copper worldwide and have long been the subject of extensive scientific research. However, their origins remain highly debated. To address this key issue, we carried out a comprehensive investigation of the Linghou deposit in South China—a typical stratiform Cu deposit—utilizing microanalytical mineralogy and in situ sulfur isotope analysis of the main ore minerals, together with high-precision geochronology of genetically related hydrothermal apatite.</div><div>Hydrothermal apatite spatially and temporally associated with copper mineralization in the Linghou stratiform ores yields a lower intercept U–Pb age of 161.0 ± 4.6 Ma (MSWD = 1.09), consistent with ages obtained from the granodiorite porphyry in the deposit. Microtextural and thermometric analyses of coexisting chalcopyrite and sphalerite indicate formation temperatures of 255–303 °C, characteristic of magmatic-hydrothermal systems. The sulfur isotope compositions of sulfide minerals exhibit a narrow δ³⁴S range of +0.68 ‰ to +2.80 ‰, further supporting a genetic relationship with granitic magmatism.</div><div>Integrated geological evidence indicates that the Linghou deposit represents a Late Jurassic Cu-polymetallic skarn system. These findings not only resolve the long-standing genetic controversy of this deposit type but also highlight the considerable exploration potential for magmatic-hydrothermal Cu-polymetallic systems along the Qin-Hang metallogenic belt. The combined application of high-precision geochronology, microscale mineral chemistry, and detailed metal source tracing provides critical constraints for understanding ore-forming mechanisms, refining genetic classifications, and establishing robust metallogenic frameworks.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107121"},"PeriodicalIF":3.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039409","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":"In-situ geochronology and geochemistry of allanite, monazite and calcite in the Yushishan metasedimentary rock-hosted Nb-Ta-REE deposit (NW China)","authors":"Cheng-Lai Deng,&nbsp;Shao-Yong Jiang,&nbsp;Hui-Min Su,&nbsp;Wei Chen,&nbsp;Tao Liu","doi":"10.1016/j.oregeorev.2026.107128","DOIUrl":"10.1016/j.oregeorev.2026.107128","url":null,"abstract":"<div><div>The newly discovered Yushishan Nb-Ta-REE deposit is hosted by metasedimentary rocks (mainly leptynite) in the South Qilian orogen, northwestern China. However, key aspects of this deposit, including the precise timing of rare earth element (REE) mineralization, its metallogenic history, and the mechanisms driving REE enrichment, remain poorly constrained. This study integrates in-situ U-Pb geochronology of REE-rich minerals (allanite and monazite), in-situ geochemical and C-Sr isotopic analyses of calcite, and whole-rock Sr-Nd-Pb isotopic compositions to elucidate the deposit’s genesis. In-situ U-Pb dating of monazite and allanite constrains the timing of REE mineralization to ∼490 Ma, indicating a genetic connection between REE mineralization and regional alkaline intrusions.<!--> <!-->Petrological and geochemical characteristics identify four types of calcites (Cal-1 to Cal-4) from aegirine-augite syenite, syenite and mineralized leptynite. Cal-1 and Cal-3, characterized by higher (La/Lu)_N ratios, are inferred to derive from magmatic fluids, whereas Cal-2 and Cal-4 likely originate from metamorphic fluids. Additionally, petrological and geochemical evidence confirms a hydrothermal origin for monazite and allanite in mineralized leptynite, highlighting the critical role of hydrothermal fluids in mineralization. Calcite C-Sr isotopic compositions indicate that ore-forming fluids incorporated components from both host rock marble and ancient strata (e.g. Daken Daban Group). Whole-rock Sr-Nd isotopes reveal a shared magma source for alkaline intrusions and leptynite, pointing to a hybridized lithospheric mantle-derived reservoir as the primary source of ore-forming materials. The metallogenic history of the Yushishan deposit is divided into two key stages: (1) a Neoproterozoic pre-enrichment stage (∼830 Ma) involving REE-enriched alkaline volcanism, which laid the foundation for subsequent mineralization; and (2) an Early Paleozoic metallogenic event (∼490 Ma) triggered by the northward subduction of the North Qilian Block beneath the Central Qilian Block. This subduction event induced asthenospheric upwelling, promoting partial melting of the lithospheric mantle to generate Nb-Ta-REE-rich melts. These melts mixed with lower crustal melts and intruded into the Aoyougou Formation leptynites. Subsequent magmatic-hydrothermal fluids then remobilized pre-existing REE reservoirs in the leptynite, culminating in REE mineralization. This multistage model underscores the combined role of magmatic-hydrothermal and metamorphic-hydrothermal systems in the activation, transport, and deposition of REEs in the Yushishan deposit.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107128"},"PeriodicalIF":3.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039413","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":"Complex magmatic processes recorded by zoned clinopyroxene in the Wajilitag mafic–ultramafic intrusion of the Permian Tarim Large Igneous Province, northwest China","authors":"Yan Luan ,&nbsp;Zhen-Ye Zhang ,&nbsp;Yi-Jun Wang ,&nbsp;Xiao-Hui Sun ,&nbsp;Matthew J. Brzozowski ,&nbsp;Chang-Zhi Wu","doi":"10.1016/j.oregeorev.2026.107124","DOIUrl":"10.1016/j.oregeorev.2026.107124","url":null,"abstract":"<div><div>The Wajilitag intrusion is one of the most important mafic–ultramafic layered intrusions in the Tarim Large Igneous Province (LIP) as it hosts significant Fe–Ti–V mineralization. Despite this, the ubiquitous zoned clinopyroxene in this intrusion have largely been overlooked, limiting our understanding of the magmatic processes by which it formed. Here, we utilize major- and trace-element compositions of clinopyroxene to assess the petrogenetic evolution of Wajilitag, including the pressure–temperature conditions of crystallization, the magmatic processes by which it evolved, and the processes that led to the formation of Fe–Ti–V mineralization. Four types of zoned clinopyroxene are identified based on texture and zoning patterns. Type 1 clinopyroxene is characterized by abrupt zones and contains rounded, irregularly resorbed high-Mg cores (Mg# = 80.5–85.2) surrounded by low-Mg rims (Mg# = 66.1–77.5). Type 2–1 clinopyroxene is characterized by oscillatory zoning in which the mantle (Mg# = 73.8–80.3) has notably higher Mg contents than the core (Mg# = 72.7–77.1) and rim (Mg# = 70.7–75.1). Type 2–2 clinopyroxene exhibits normal zoning, in which Mg# and Cr contents gradually decrease from the core through the mantle to the rim. Type 3 clinopyroxene displays prism sector ({-111}) and hourglass sector ({010} and {110}) zoning, the presence of which implies a low to moderate degree of undercooling (ΔT = 40–51 °C). Type 4 clinopyroxene is euhedral and exhibits complex zoning (Mg# = 70.7–77.7). Clinopyroxene-only thermobarometry for mafic rocks at Wajilitag delineate two distinct magma reservoirs — (1) a deep, high-temperature magma chamber at ∼ 9.9 km depth and (2) a shallow, low-temperature magma chamber at ∼ 5.9 km depth. The parental magma in the deep chamber was likely more primitive than that in the shallow chamber, forming the Cr–Mg-rich core of type 1 clinopyroxene; the more evolved nature of the magma in the shallow chamber formed Cr–Ni-depleted clinopyroxenes represented by clinopyroxene types 2–4 and the rim of type 1. The H₂O contents of the parental magmas range from 1.3–2.3 wt% (average = 1.8 wt%) in the deep magma chamber and 0.8–3.0 wt% (average = 2.0 wt%) in the shallow chamber. Iron–Ti oxides in the Wajilitag intrusion crystallized from an Fe–Ti-rich, oxidized, and hydrous magma at pressures and temperatures of 0.4–1.6 kbar and 1096–1137℃, respectively, and then accumulated during magma replenishment and vigorous convection. The complex textural and compositional characteristics of clinopyroxene at Wajilitag indicate that the intrusion represents an open magmatic plumbing system beneath the Tarim LIP that was periodically replenished by evolved and hydrous magmas.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107124"},"PeriodicalIF":3.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039370","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":"Cu-Au vein-type mineralization in the Danyore Valley, Kohistan arc, northern Pakistan: Insights from geochemistry, geochronology, and sulfide alteration","authors":"Iqtidar Hussain ,&nbsp;Huan Li ,&nbsp;Mohamed Faisal ,&nbsp;Asad Khan ,&nbsp;Mohammad Naseer ,&nbsp;Jubril Izge Hassan ,&nbsp;Hasnain Ali","doi":"10.1016/j.oregeorev.2025.107091","DOIUrl":"10.1016/j.oregeorev.2025.107091","url":null,"abstract":"<div><div>The Kohistan terrane of northern Pakistan, one of the largest Cretaceous island-arc complexes, is well documented in terms of tectono-magmatic evolution, yet its metallogenic framework remains poorly constrained. The Danyore Valley in Gilgit-Baltistan hosts Cu-Au-bearing quartz veins associated with Mesozoic gabbro-diorite intrusions of the Ladakh-Kohistan arc. The age, petrogenesis, and ore-forming processes of this system have not previously been established. Here, we integrate field observations, petrography, whole-rock geochemistry, LA-ICP-MS zircon U-Pb geochronology, zircon and sulfide geochemistry, and S-Pb isotopic data to constrain the evolution of the host rocks and the origin of mineralization. Zircon U–Pb dating indicates Early Cretaceous crystallization ages (∼110 Ma) for the host rocks, while geochemical signatures reveal a calc-alkaline arc affinity, derived from a depleted mantle source metasomatized by slab-derived fluids and modified through fractional crystallization in a continental margin setting. The sulfide mineralization occurs in NW- and NE-trending quartz veins dominated by chalcopyrite, pyrite, and bornite with notable gold enrichment, accompanied by phyllic, propylitic, and carbonatization alteration. Sulfur and lead isotope compositions suggest mixed mantle and crustal sources, including contributions from granitoids of the Kohistan Batholith. Collectively, these results demonstrate that the Danyore Valley mineralization represents an Early Cretaceous, structurally controlled, arc-related Cu–Au vein system, thereby reducing metallogenic uncertainty within the Kohistan terrane and highlighting its exploration potential.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107091"},"PeriodicalIF":3.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039305","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":"In situ compositions and sulfur isotopes of the copper sulfides from the Jiama giant copper polymetallic deposit: implications for ore-forming material sources, gold enrichment mechanism and mineral exploration","authors":"Fenghua Gu ,&nbsp;Xiang Fang ,&nbsp;Juxing Tang ,&nbsp;Pan Tang ,&nbsp;Hongjin Chen ,&nbsp;Aorigele Zhou ,&nbsp;Miao Sun ,&nbsp;Zhengkun Yang","doi":"10.1016/j.oregeorev.2025.107095","DOIUrl":"10.1016/j.oregeorev.2025.107095","url":null,"abstract":"<div><div>The Jiama giant copper polymetallic deposit is one of the most important deposits in the Gangdise metallogenic belt, which consists of hornfels-type Cu-Mo, skarn-type Cu-polymetallic, porphyry-type Mo-Cu, and distal vein-type Au orebodies with associated Ag, W, and Bi mineralizations. This deposit develops a large number of copper sulfides, such as bornite, juxingite and chalcopyrite. This study carried out LA-ICP-MS and EPMA analyses on the aforementioned copper sulfides to (1) assess the elements’ partitioning and distribution pattern in the mineral assemblage, (2) trace the ore-forming material source, (3) decipher the metallogenetic physicochemical environment, and (4) ascertain the gold enrichment mechanism. The study results show that both bornite and juxingite are enriched in Bi, in particular with the juxingite, whose Bi peak content reaches 80425 ppm. Besides, as the most important gold carrier in the Jiama deposit, bornite contains significantly more Au and Ag contents than those in other sulfides, and the content of Bi, Au and Ag in bornite shows a decreasing trend from the distal skarn to the proximal skarn. In contrast to bornite and juxingite, chalcopyrite possesses much lower Bi, Au and Ag contents. Elemental correlation analysis shows that the contents of Au and Ag in bornite and chalcopyrite are positively correlated with those of the elements, such as Bi, Te and Se, which could be indicative of the spatial location of mineralization. The δ³⁴S values of the most sulfide samples in Jiama deposit range from −3.42 to −0.9, which are similar to those in the porphyry of the Gangdise metallogenic belt, indicating an ore-forming material source of the neogenic lower crust with addition of the mantle-derived materials. Locally, some bornite samples possess much lower δ³⁴S values (−7.52 to −6.81), which implies that there maybe a mixing of the organic sulfur from the wall rocks of the Linbuzong Formation or sulfur isotope fractionation caused by cooling. The formation temperature of bornite-chalcopyrite assemblages ranges from 236℃ to 345℃, and the mineral assemblages reveal that the log <em>f</em>S₂ was greater than −12 during the main stage of skarn mineralization, while the <em>f</em>S₂ was less than −11 during the late mineralization of skarn. The gold enrichment in bornite and juxingite was closely relevant to existence of the Bi-Au melt. During the mineralization process, Bi melts scavenged Au from hydrothermal fluids, and the fluctuation of oxygen fugacity led to precipitation of the Bi-Au melts and enrichment of gold in bornite. With the temperature cooling, the juxingite exsolved from the bornite and captured the residual gold in the fluid.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107095"},"PeriodicalIF":3.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981696","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":"Magmatic and hydrothermal superimposition in Nb-Ta-Li mineralization at the Hailuoling deposit, South China: Records from columbite-tantalite chronology and mica chemistry","authors":"Yu Zhou ,&nbsp;Yong Zhang ,&nbsp;Zhe Xu ,&nbsp;Fangrong Zhang ,&nbsp;Jiayong Pan ,&nbsp;Haotong Dai ,&nbsp;Fushen Zhang ,&nbsp;Wei Wan ,&nbsp;Bin He ,&nbsp;Cong Liu","doi":"10.1016/j.oregeorev.2025.107083","DOIUrl":"10.1016/j.oregeorev.2025.107083","url":null,"abstract":"<div><div>The Hailuoling Nb–Ta deposit in the Wuyi metallogenic belt of South China represents a typical granite-related rare-metal system that has recently been recognized to host associated Li mineralization. To constrain its metallogenic evolution, we integrate petrological, geochronological, and geochemical data. LA–ICP–MS U–Pb dating of monazite and columbite–tantalite indicates that the porphyritic biotite monzogranite crystallized at 147.2 ± 1.9 Ma, whereas Nb–Ta mineralization occurred at 144.4 ± 2.1 Ma, both during the Late Jurassic–Early Cretaceous transition. Li-bearing micas including protolithionite, zinnwaldite, lithium phengite, and lithium muscovite, in mineralized granite replace primary biotite, feldspar, and quartz and display irregular grain boundaries and well-developed compositional zoning, providing textural evidence for hydrothermal metasomatism. Mica compositions define a systematic evolutionary trend characterized by increasing SiO₂ and decreasing FeO contents, while trace element data reveal an initial enrichment followed by depletion of Li, Nb, and Ta. These features support a two-stage model involving an early post-magmatic hydrothermalism stage followed by a later hydrothermal metasomatism stage. Hydrothermal micas are characterized by Nb/Ta ratios of 0.5–2.5 and K/Rb ratios of 8–12. Comparative analyses with micas from unmineralized granites and from the Maoping and Xianghualing deposits highlights the necessity of overprinting by late-stage magmatic–hydrothermal fluids, in combination with external fluid input, to achieve economically significant rare-metal enrichment in early intrusions that did not independently reach ore-forming thresholds. We conclude that the interplay between magmatic differentiation and hydrothermal overprinting is critical for the mobilization and concentration of rare metals in certain granitic systems.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107083"},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950229","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":"Why Middle Jurassic coal seams generally lack volcanic-ash-altered kaolinitic layers and critical metals enrichment compared to the Carboniferous-Permian in the Ordos Basin, North China?","authors":"Shuai Zhang,&nbsp;Xiaomeng Sun,&nbsp;Xi Xu,&nbsp;Qinfu Liu","doi":"10.1016/j.oregeorev.2026.107108","DOIUrl":"10.1016/j.oregeorev.2026.107108","url":null,"abstract":"<div><div>The North China Craton (NCC) experiences two major coal-forming episodes: the Late Carboniferous–Early Permian and the Early–Middle Jurassic. Despite the tectonically active setting of the NCC during the Middle Jurassic, volcanic-ash-altered kaolinitic layers and an enrichment of critical metals are notably lacking in Middle Jurassic coal seams relative to those of the Carboniferous–Permian, and the causes of this disparity remain unclear. This study investigates the contributions of inorganic inputs during peat accumulation and the influence of hydrothermal activity on Middle Jurassic coal seams in the Ordos Basin, aiming to clarify the geological controls underlying this disparity. The clastic materials of the coal and partings were derived from the weathering of uplifts around Ordos Basin, without a critical metals-rich source rocks therein. The peat accumulation during the Middle Jurassic did not coincide with intensive magmatic events in adjacent tectonic domains (Mongol–Okhotsk, Paleo-Pacific, and Bangong-Nujiang Tethys), resulting in limited volcanic ash input. Although the No. 6 coal seam contains XRD-detectable apatite, it is authigenic, forming during peat deposition or early diagenesis, and is not significantly enriched in rare earth elements. Moreover, the intense Late Jurassic–Early Cretaceous magmatic–hydrothermal activity linked to rollback of the subducted Paleo-Pacific Plate in the eastern NCC did not extend to the Ordos Basin. Therefore, the lack of volcanic-ash-altered kaolinitic layers and an enrichment of critical metals in the Middle Jurassic coal seams is primarily attributed to the limited supply of critical metal-enriched detrital material and volcanic ash, and negligible hydrothermal influence during and after peat accumulation.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"189 ","pages":"Article 107108"},"PeriodicalIF":3.6,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950195","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}