Ore Geology Reviews最新文献

{"title":"Mode of occurrence of critical metals in the Jurassic coals, northern Xinjiang, China: Based on the sequential chemical extraction procedure","authors":"Ruoyu Wang ,&nbsp;Piaopiao Duan ,&nbsp;Wenfeng Wang ,&nbsp;Aleksei Kholodov ,&nbsp;Lingling Dong ,&nbsp;Zhen Feng","doi":"10.1016/j.oregeorev.2025.106730","DOIUrl":"10.1016/j.oregeorev.2025.106730","url":null,"abstract":"<div><div>In the Jurassic coals from northern Xinjiang, China, the enrichment of critical metals has been continuously discovered. However, there is limited research on their mode of occurrence and a lack of quantitative analysis of their presence in different components. This study used a sequential chemical extraction procedure combined with field emission-scanning electron microscopy to investigate the mode of occurrence of critical metals in the Early Jurassic Taliqike Formation coals from Kubai coalfield and the Middle Jurassic Xishanyao Formation coals from Tuokexun and Heshituoluogai coalfields. The mineral substance includes quartz, calcite, pyrite, dolomite, anatase, clays, and minor zircon, florencite and monazite. Additionally, significant amounts of sphalerite were found in Heishan coals in Tuokexun coalfield. The Xishanyao coal has a generally higher content of major element oxides (except for CaO). Apart from the abnormal enrichment of Ge in Heishan coal (44.76 µg/g) and Zr in Sulahema coal (232.96 µg/g), other critical metals are slightly enriched or normal. Zr(Hf) in coal primarily occurs in zircon and anatase, while Nb(Ta) mainly exists in aluminosilicate. They are also potentially adsorbed as ions in the clay interlayers, encapsulated in clays as carbonate minerals, or present in pyrite and phosphate minerals. Gallium in coal generally exists in clays and phosphate minerals, but Ga in Sulahema coal primarily occurs in inertinite. Germanium primarily occurs in inertinite, whereas Ge in Heishan coal is mainly associated with sulfide. Germanium exhibits a strong positive correlation with both zinc and sulfur, indicating that Ge is potentially in sphalerite and associates weakly with pyrite and organic matter.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106730"},"PeriodicalIF":3.2,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470738","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 sediment-hosted Sanshierzhan Au deposit, NE China: Evidences from the pyrite geochemistry and s-Hg isotopes","authors":"Xiangwen Li ,&nbsp;Changzhou Deng ,&nbsp;Deyou Sun ,&nbsp;Shanshan Liang ,&nbsp;Lidong Zhang ,&nbsp;Weipeng Liu ,&nbsp;Bizheng Yang ,&nbsp;Xingmin Zhang ,&nbsp;Xinran Ni","doi":"10.1016/j.oregeorev.2025.106719","DOIUrl":"10.1016/j.oregeorev.2025.106719","url":null,"abstract":"<div><div>The Mohe Basin is a famous placer gold (Au) field in Northeast (NE) China, and has garnered more attention due to the discovery of several sediment-hosted Au deposits. However, the genesis of these deposits remains poorly constrained. This study investigates the pyrite geochemical and S-Hg isotopic data from the sediment-hosted Sanshierzhan Au deposit to provide a critical insight into the metallogenic mechanism of the sediment-hosted Au mineralization in NE China. At Sanshierzhan, pyrite predominantly occurs as disseminated grains in altered sandstones, with minor occurrences in quartz veins. Three pyrite generations (Py I, Py II, and Py III) were identified from four mineralization stages. These include: coarse-grained pyrite (Py I) disseminated in altered sandstones, which shows dissolution textures; fine grained zonal pyrite (Py II) disseminated in polymetallic sulfide quartz vein with dissolution surface in its core (Py II-1) and relatively clean rim (Py II-2); medium grained pyrite (Py III) disseminated in calcite-quartz veins. These textural features, particularly zoned structures and inhomogeneous element distributions, record a dynamic change of fluid composition during the Au precipitation. The δ³⁴S values of the pyrite generations Py I, Py II, and Py III range from 3.07 ‰ to 4.27 ‰, 4.41 ‰ to 6.15 ‰, 6.27 ‰ to 9.96 ‰, respectively. Most of these values exceed the magmatic δ³⁴S values (−5.00 ‰ to + 5.00 ‰), indicating the involvement of the crustal sulfur (S) during the Au mineralization. Furthermore, Hg isotopic data from ore (pyritized and silicified rocks) and altered rock samples at Sanshierzhan show slightly negative to positive δ²⁰²Hg values (−0.28 ‰ to 0.76 ‰) and negative to near zero Δ¹⁹⁹Hg values (−0.11 ‰ to 0.04 ‰). Their positive δ²⁰²Hg values suggest preferential leaching of heavy Hg isotopes from source area. Significantly, the slightly negative Δ¹⁹⁹Hg values are similar with those of the terrestrial reservoirs, further indicating that some Hg as well as Au was likely derived from the upper continental crust. Therefore, our findings demonstrate that the Sanshierzhan mineralization is likely the result of strong water–rock reaction triggered by the magmatic-hydrothermal fluids. This hydrothermal system facilitated the remobilization of elements from the upper continental crust, together with the ore-forming metals carried by the magmatic fluids, causing the enrichment of Au in the hydrothermal system.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106719"},"PeriodicalIF":3.2,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289062","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":"Geochemical characteristics and their implications on mineralization of biotite from the Maodeng Mo-Bi-Sn-Cu deposit, southern Great Xing’an Range, China","authors":"Gen-Yuan Ji ,&nbsp;Xiang-Guo Guo ,&nbsp;Si-Hong Jiang ,&nbsp;Si-Zi Li ,&nbsp;Peng-Cheng Yan ,&nbsp;Lin-Jun Chen","doi":"10.1016/j.oregeorev.2025.106714","DOIUrl":"10.1016/j.oregeorev.2025.106714","url":null,"abstract":"<div><div>The Maodeng Mo-Bi-Sn-Cu deposit lies in the southern part of the Great Xing’an Range. In this deposit, the ore-associated Alubaogeshan complex has been identified, which consists of porphyritic monzogranite (PMG), granite porphyry (GP), and alkali feldspar granite (AFG). This research provides the major-trace element concentrations in biotites from the three granite subtypes, with the intention of uncovering the petrogenetic relationships among different lithologies. The biotites in the Alubaogeshan complex have a magmatic origin. As the granitic subtypes change from PMG and GP, to AFG, they vary from alkaline anorogenic to peraluminous types. Simultaneously, the biotites exhibit a diverse array of compositions, spanning from lepidomelane to protolithionite-zinnwaldite. The total aluminum content and the Fe/(Fe + Mg) values in biotites rise gradually from PMG to GP and then to AFG, indicating a progressive degree of magmatic evolution. The trend of increasing magmatic differentiation from PMG to AFG is manifested by the decline in K/Rb and Nb/Ta ratios and the increase in contents of Rb, Cs, Sn, W and Li in biotites. From PMG to GP and then to AFG, a decrease in IV(F) value and an increase in IV(Cl) value in biotite suggest that a high-degree fractional crystallization resulted in F enrichment, and fluid exsolution caused Cl depletion in the residual melt. From PMG to AFG, Nb/Ta ratios of biotite drop from 12.8 to 33.5 to 2.76–3.66. This study indicates that fractional crystallization of biotite, as well as intense interaction of melt and fluid, is the main factor causing the decrease in biotite Nb/Ta ratios in the Alubaogeshan complex. The highly fractional crystallization, intense exsolution of Cl-bearing fluid, and enrichment of the F element in the ore-related granite may exert a crucial role in mineralization in the Maodeng deposit.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106714"},"PeriodicalIF":3.2,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263926","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 Boka vein-type Au deposit, Dongchuan, southwestern China: Insights from rutile U–Pb dating and pyrite chemistry","authors":"Hongyu Ren ,&nbsp;Chao Li ,&nbsp;Qinggao Yan ,&nbsp;Xiaojun Jiang ,&nbsp;Hao Zhang ,&nbsp;Jihao Zhang ,&nbsp;Pengyue Yu ,&nbsp;Zeqi Liu","doi":"10.1016/j.oregeorev.2025.106716","DOIUrl":"10.1016/j.oregeorev.2025.106716","url":null,"abstract":"<div><div>The Boka gold deposit, located in the Kangdian metallogenic province of southwestern China, is a newly explored vein-type gold deposit that is distinct from the typical iron oxide-copper–gold (IOCG) deposits in the region. Gold mineralization is primarily hosted in quartz-sulfide veins within alteration zones surrounding diabase, with an estimated reserve of 20 tons and an average grade of 1.6 <!--> <!-->g/t. Given that gold predominantly occurs as native gold in quartz-pyrite veins, the timing and source of ore-forming materials remain widely debated. To better understand the genesis of the Boka deposit and its relationship to regional tectonic events, this study conducted <em>in situ</em> rutile U–Pb dating and geochemical analysis on hydrothermal rutile and pyrite associated with native gold. The U–Pb dating of rutile yields a lower intercept age of 783 ± 32 <!--> <!-->Ma, consistent with previously reported pyrite Re-Os ages, thereby providing a precise formation age for the Boka gold deposit. The δ³⁴S values of gold-stage pyrite (4.54 ‰-6.03 ‰), combined with its low Co/Ni ratios (&lt;1), indicate that hydrothermal fluids are primarily derived from magmatic fluids associated with coeval diabase. Gold-enriched strata in the region are interpreted to have formed in a continental-rift setting during the Paleoproterozoic to Mesoproterozoic, providing the primary source of gold. Magmatism of diabase, emplaced in an extensional tectonic setting, acts as a key driver for hydrothermal-fluid circulation and gold remobilization. Based on these findings, we propose that the Boka deposit is a product of subduction-related magmatism during Neoproterozoic, representing a new magmatic–hydrothermal deposit type in the Kangdian region. These insights are expected to advance our understanding of regional metallogenesis and offer valuable guidance for future exploration.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106716"},"PeriodicalIF":3.2,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271480","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":"Enhanced solubility of gold in crude oil at high temperatures: new insights into ore genesis","authors":"Zhiyong Ni ,&nbsp;Hengwang Cui ,&nbsp;Huan Chen ,&nbsp;Kai Shi ,&nbsp;Weng Zhang ,&nbsp;Ganggang Shao","doi":"10.1016/j.oregeorev.2025.106715","DOIUrl":"10.1016/j.oregeorev.2025.106715","url":null,"abstract":"<div><div>Gold’s exceptional conductivity and corrosion resistance make it indispensable in various industries, yet its transport and deposition mechanisms remain a subject of exploration. While hydrothermal fluids are traditionally considered the primary medium for gold mobilization, recent evidence suggests hydrocarbons could also transport metals under specific conditions. This study investigates the solubility of gold in crude oil with varying compositions at temperatures up to 250 °C, focusing on the role of sulfur (S) content and Total Acid Number (TAN). Crude oils from the Bohai Bay Basin, China, were exposed to gold wires for durations of up to 30 days in a quartz tube and titanium alloy tube setup. Results reveal that gold solubility increases with temperature and time, with maximum concentrations observed at 250 °C. The highest solubility (19.8 ppm) was observed in the oil sample with the highest sulfur (S) and Total Acid Number (TAN) content. Furthermore, X-ray Photoelectron Spectroscopy (XPS) analysis indicates that gold (Au) exhibits a strong affinity for carbon-, oxygen-, and sulfur-containing compounds in crude oil, suggesting the formation of thiol or organic acetate complexes. Post-experiment SEM analysis revealed significant surface erosion of gold wires, supporting the hypothesis of enhanced gold dissolution in hydrocarbons at elevated temperatures. These findings challenge conventional ore genesis models by highlighting hydrocarbons as a potential medium for metal transport in organic-rich and petroleum-bearing environments, offering new perspectives for understanding hydrocarbon-driven gold mineralization.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106715"},"PeriodicalIF":3.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255403","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":"Zinc and cadmium isotopes in pyrite constraint on metal sources in the Guoluolongwa orogenic gold deposit, East Kunlun metallogenic belt","authors":"Haitao Li ,&nbsp;Xinming Zhang ,&nbsp;Te Liu ,&nbsp;Jiajie Chen ,&nbsp;Ming Li ,&nbsp;Zhenli Zhu ,&nbsp;Yuqiu Ke ,&nbsp;Shenghong Hu","doi":"10.1016/j.oregeorev.2025.106717","DOIUrl":"10.1016/j.oregeorev.2025.106717","url":null,"abstract":"<div><div>The Guoluolongwa orogenic gold deposit is the most typical and largest gold deposit in the Gouli goldfield of the East Kunlun Orogen, and its mineralization was closely related to mantle magmatic hydrothermal fluid. However, its genesis study has been trapped due to the controversy regarding the relationship between mineralization and metamorphic wall rocks. Here, we use Zn and Cd isotopes in pyrite to trace the source of Guoluolongwa orogenic gold deposit. In the beginning, we verify that Zn and Cd in pyrite are closely connected with mineralization based on elemental compositions and mineralogy, which suggests that Zn and Cd in pyrite occur mainly as sphalerite inclusion and were precipitated from ore-forming fluid during pyrite precipitation. Pyrites from the Guoluolongwa deposit show obviously heavier δ⁶⁶Zn and <em>δ</em>^114/110Cd values (δ⁶⁶Zn_{JMC-Lyon 3-0749L} = 0.17 ∼ 0.44 ‰; <em>δ</em>^114/110Cd_{NIST SRM 3108} = 0.02 ∼ 0.56 ‰) than those of mantle magmatic fluid (δ⁶⁶Zn = 0.19 ∼ 0.27 ‰; <em>δ</em>^114/110Cd = 0.01 ∼ 0.21 ‰) and deposits which were closely associated with magmatism (δ⁶⁶Zn = −0.43 ∼ 0.23 ‰; <em>δ</em>^114/110Cd = −0.25 ∼ 0.05 ‰), indicating that the deposit was not formed solely by mantle magmatic fluid. The process of pyrite precipitation, including vigorous boiling of hydrothermal fluid and pyrite recrystallization, have limited impact on the Zn and Cd isotopes in pyrite. Therefore, Zn and Cd isotopes in pyrite inherit the isotopic composition of ore-forming fluid and can be used to trace the metal source of Guoluolongwa deposit. The δ⁶⁶Zn and <em>δ</em>^114/110Cd values of pyrites fall within the range of metamorphic wall rock (δ⁶⁶Zn = 0.47 ∼ 0.51 ‰; <em>δ</em>^114/110Cd = 0.52 ∼ 0.57 ‰) and mantle magmatic fluid, and they display a close positive correlation (R² = 0.71), This indicates that the Guoluolongwa deposit was formed by the mixing of metamorphic wall rock and mantle magmatic fluid. Furthermore, the systematic decrease of δ⁶⁶Zn and <em>δ</em>^114/110Cd values of pyrites reflects that the contribution from metamorphic wall rock decreased after stage I and that magmatic fluid became the dominant metal source in stage II and III. We propose that the Guoluolongwa deposit originated from the mixing of metamorphic wall rock and magmatic fluid and suggest that the combination of Zn and Cd isotopes in pyrite can be used to trace the metal sources of orogenic gold deposits. It is a promising indicator for future applications due to the widespread of pyrites in hydrothermal deposits.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106717"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242392","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":"Geochronology, geochemistry, and Hf isotopic compositions of the Jintonghu porphyry Cu-Mo deposit in the Zijinshan ore district, SE China: Insights into the controlling factors on magma fertility","authors":"Xuena Wang ,&nbsp;Chao Wu ,&nbsp;Chao Xu ,&nbsp;Bing Xiao","doi":"10.1016/j.oregeorev.2025.106720","DOIUrl":"10.1016/j.oregeorev.2025.106720","url":null,"abstract":"<div><div>The Jintonghu porphyry Cu-Mo deposit is located in the Zijinshan ore district within the southeastern coastal volcanic belt, China. Copper mineralization is predominantly restricted to the granodiorite porphyry, whereas the other intrusions remain barren. This disparity highlights the need for deeper insights into the controlling factors on magma fertility and its contribution to copper mineralization. There are four intrusive phases at Jintonghu, including the Early Cretaceous pre-mineralization Sifang granodiorite (109.2 ± 0.6 Ma), syn-mineralization diorite porphyry (105.4 ± 0.4 Ma), dacite porphyry (105.5 ± 0.5 Ma), and granodiorite porphyry (105.5 ± 0.5 Ma and 105.6 ± 0.5 Ma), late-mineralization porphyritic granodiorite (103.4 ± 0.6 Ma), and Late Cretaceous post-mineralization quartz syenite porphyry (99.1 ± 1.0 Ma). Zircon Hf isotopic compositions demonstrate that the Early Cretaceous intrusions share a similar source. The granodiorite porphyry and porphyritic granodiorite present higher zircon ε_Hf(t) values (−2.49 to 1.43), suggesting an increasing contribution from the mantle-derived materials or juvenile crust. The estimated oxygen fugacity based on zircon trace elements shows no clear differences among the pre-, syn-, and late-mineralization phases, suggesting that oxygen fugacity is not the first-order factor controlling magma fertility at Jintonghu. Instead, the granodiorite porphyry and porphyritic granodiorite are inferred to be more hydrous, as evidenced by distinctly elevated zircon Eu/Eu* (0.42–0.91), 10,000 × (Eu/Eu*)/Y (4.61–17.5), and (Ce/Nd)/Y (0.01–0.19) ratios, along with low zircon Dy/Yb (0.11–0.17) ratios and amphibole-dominated fractionation. Therefore, high magmatic water content is the dominant factor controlling magma fertility in the Jintonghu deposit. Furthermore, the porphyritic granodiorite shares coincident geochemical proxies with those of the ore-hosting granodiorite porphyry, combined with their comparable alteration patterns, indicating its copper mineralization potential.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106720"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255405","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":"Ambient noise seismic tomography of Tonglushan skarn-type Cu-Fe-Au deposit in Eastern China","authors":"Jialiang Jing ,&nbsp;Guoxiong Chen ,&nbsp;Pei Li ,&nbsp;Fuwen Xu","doi":"10.1016/j.oregeorev.2025.106718","DOIUrl":"10.1016/j.oregeorev.2025.106718","url":null,"abstract":"<div><div>The Tonglushan (TLS) skarn-type Cu-Fe-Au deposit, located in Hubei Province of China, is facing the challenge of depletion of shallow mineral resources, highlighting the urgent need for deep mineral exploration to sustain future resource development. A range of geophysical methods has been employed to delineate subsurface lithology beneath the TLS deposit, with a particular focus on identifying skarn mineralization, which is commonly occurs along granite-marble boundaries. However, gravity and magnetic methods are less effective for detecting small geological bodies at depths &gt; 1 km, while electromagnetic methods suffer from strong noise interference from ongoing mining activities herein. In this study, we present the first application of ambient noise tomography (ANT) to TLS ore deposit for imaging shear wave velocity structures by using a dense linear seismic array (∼10 km). The velocity images agree well with geological information revealed by drilling holes, accurately delineating the marble formation and fault structures, both of which are characterized by low-velocity anomalies. Notably, the magnetic responses of lithological model inferred from ANT agree well with the observed aeromagnetic data. The inversion results precisely delineate the interfaces between granite and marble, where the largest ore body of the TLS ore deposit is located. The geological model derived from geophysical inversion results provides a more comprehensive understanding of the TLS Cu-Fe-Au mineral system. It reveals that the granite intrusion extends to a depth of ca. 2.5 km, while the captive marble formation may reach depths of up to 2 km beneath the TLS ore deposit. These results provide key clues for finding potential skar-type Cu-Fe-Au ore bodies related to granite-sediment boundaries in the deep space (at ca. 1.0–2.0 km) of the TLS ore deposits.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106718"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306663","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":"Dating a sedimentary manganese ore deposit using U-Pb geochronology of hausmannite (Mn3O4) by LA-ICP-MS: An example from Heqing Mn deposit, Yunnan Province, Southwestern China","authors":"Wen-Tian Li ,&nbsp;Shao-Yong Jiang ,&nbsp;Hui-Min Su ,&nbsp;Qin Huang ,&nbsp;Dao-Hui Pi ,&nbsp;Wei Wang ,&nbsp;Shugang Xiao","doi":"10.1016/j.oregeorev.2025.106711","DOIUrl":"10.1016/j.oregeorev.2025.106711","url":null,"abstract":"<div><div>Accurately dating sedimentary manganese (Mn) deposits remains challenging due to the scarcity of suitable geochronometers. Mn oxide minerals—which host relatively high uranium (U) and low lead (Pb) concentrations—offer significant potential as a viable geochronometric tool.<!--> <!-->In this study, we report the first accurate direct measurements of in-situ U-Pb ages of hausmannite (Mn₃O₄) from the Heqing sedimentary Mn deposit (Yunnan Province, Southwestern China), obtained via laser ablation-inductively coupled mass spectrometry (LA-ICP-MS). The U-Pb age of 229.5 ± 4.5 Ma for U-bearing hausmannite aligns remarkably with the 226 ± 3.4 Ma age of interbedded basalt in the Late Triassic Mn-bearing Songgui Formation, confirming a sedimentary-diagenetic origin for this deposit. This concordance validates Mn oxide U-Pb geochronology as a novel and reliable method for dating sedimentary Mn deposits. Furthermore, these ages provide direct support for the oxic ore genetic model, indicating primary deposition of Mn as oxides in sediments. By enabling direct dating of hausmannite and other Mn oxides, this research fills a critical gap in Mn mineralization chronology. Applied globally to sedimentary Mn deposits across geological time, and leveraging Mn’s redox sensitivity, this method promises new insights into Earth’s exogenic environmental evolution.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"183 ","pages":"Article 106711"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205720","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":"Facies architecture, ore genesis (Zn-Pb-Cu) and structural evolution of the Paleoproterozoic Aijala–Metsämonttu area, SW Finland","authors":"J. Hokka ,&nbsp;R. Lahtinen","doi":"10.1016/j.oregeorev.2025.106707","DOIUrl":"10.1016/j.oregeorev.2025.106707","url":null,"abstract":"<div><div>A field-based study was conducted in the metamorphosed and deformed Aijala–Metsämonttu area within the Orijärvi formation, part of the Uusimaa belt (1.9–1.88 Ga) in southern Finland. The study aimed to enhance understanding of the regional facies architecture and tectonic framework. Volcanic facies analysis, lithogeochemistry, and sulfide textural interpretations were utilized, allowing us to reassess the previously suggested exhalative model of the Metsämonttu sulfide deposit (1.5 Mt at 3.5 wt% Zn, 0.8 wt% Pb, 0.3 wt% Cu, 13.2 wt% S, 25 g/t Ag, and 1.4 g/t Au, production 1952–1974) to assist regional exploration.</div><div>Regionally, D₁ thrusting was the primary significant structural event, associated with the common occurrence of both L–S and L-tectonites. D₂ represents nearly orthogonal shortening, producing upright to steeply inclined F₂ folds. The Aijala–Metsämonttu area is dominated by a felsic volcaniclastic lithofacies association, originating from voluminous silicic magmas. The region features both primary and redeposited rhyolitic pyroclastic deposits intercalated with carbonates and iron formations, alongside subordinate dacite-rhyolite complexes and submarine mafic fissure vents. Geochemically, the rocks exhibit subalkaline to transitional magmatic affinities, indicating a volcanic arc system likely associated with early-stage rifting, extensional basin formation in an intra-arc or back-arc setting. The Metsämonttu succession primarily consists of resedimented syn-eruptive volcaniclastic deposits intercalated with sedimentary facies. The Metsämonttu sulfide deposit, hosted by metavolcanic rocks, marble, and skarn, contains semimassive to stringer-style polymetallic sulfides, controlled by stretching along D₁ recumbent fold axes (L-tectonite) and subsequent vertical stretching along D₂ limbs. The mineralization is considered a metamorphosed subseafloor carbonate replacement deposit, hosted within permeable polymict dacitic fiamme-lithic pumiceous breccia.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"184 ","pages":"Article 106707"},"PeriodicalIF":3.2,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263927","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}