Ore Geology Reviews最新文献

{"title":"Metallic Mineral Resources: The Critical Components for a Sustainable Earth","authors":"Douglas J. Kirwin (Consultant Geologist)","doi":"10.1016/j.oregeorev.2025.106578","DOIUrl":"10.1016/j.oregeorev.2025.106578","url":null,"abstract":"","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106578"},"PeriodicalIF":3.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Melt fluid evolution and ore-forming mechanism of the Murong superlarge single-vein pegmatite-type lithium deposit in western Sichuan, China","authors":"Qing Lei , Guozhi Wang , Fufeng Zhao , Dabin Yue , Na Li , Yuzhen Fu , yuanliang Yang , Gang Liu , Zhaoliang Hou","doi":"10.1016/j.oregeorev.2025.106594","DOIUrl":"10.1016/j.oregeorev.2025.106594","url":null,"abstract":"<div><div>The Murong superlarge pegmatite-type lithium deposit is located in the Songpan–Ganze orogenic belt in western Sichuan, China, and is now the largest single-vein pegmatite-type lithium deposit in Asia. This paper analyzes the melt fluid evolution process, lithium enrichment, and mineralization mechanism of lithium-rich pegmatite by studying the types of inclusion assemblages, estimated capture temperatures and pressures, and inclusion compositions of spodumene and associated minerals in different zones of the pegmatite. The Murong pegmatite can be laterally divided into three zones: the felsic shell zone (Zone Ⅰ), the coarse-grained spodumene zone (Zone Ⅱ), and the felsic core zone (Zone Ⅲ). Spodumene mainly develops in Zone Ⅱ. This study reveals six types of inclusions in the Murong pegmatite: melt inclusions (T<sub>1-1</sub>), melt–fluid inclusions (T<sub>1-2</sub>), crystal–rich inclusions (T<sub>1-3</sub>), CO<sub>2</sub>–NaCl–H<sub>2</sub>O system inclusions (T<sub>2</sub>), NaCl–H<sub>2</sub>O system inclusions (T<sub>3</sub>), and monophase CO<sub>2</sub> inclusions (T<sub>4</sub>). There are significant differences in the melt/fluid inclusion assemblages and the formation temperatures of inclusions in different zones. The overall trend is from melt inclusions + melt–fluid inclusions to crystal–rich inclusions to CO<sub>2</sub>–NaCl–H<sub>2</sub>O system inclusions and then to NaCl–H<sub>2</sub>O system inclusions, which records the complete process of pegmatite magma evolution from melt fluids to hydrothermal fluids, indicating a high degree of evolution of the pegmatite magma. During evolution from melt fluids to hydrothermal fluids, the composition system evolves from a high temperature (>450 °C) lithium-rich phosphate-lithium-rich carbonate silicate system enriched with volatile components (F<sub>2</sub>, CO<sub>2</sub>, B) to a medium to high temperature (240–350 °C) lithium-rich phosphate–lithium-containing carbonate silicate system enriched with volatile components (CO<sub>2</sub>, B) and then to a medium to low temperature (<300 °C) hydrothermal fluid system enriched with volatile components (CO<sub>2</sub>). The ore-forming process mainly occurred during decompression and cooling as melt fluids evolved into hydrothermal fluids, with pressures ranging from approximately 5 kbar to 1.5 kbar during mineralization. The ore-forming fluids evolved from a weakly alkaline environment in the early stage to an acidic environment in the late stage. Immiscibility is an important mechanism for promoting the precipitation of spodumene during the evolution of Murong pegmatite magma fluid. Compared with other pegmatite-type lithium deposits in the same tectonic belt, the extremely thin Zone Ⅰ (magmatic crystallization zone) and the absence of planar zoning in the study area suggest that the original magma, from which the pegmatite-type lithium deposits in the study area formed, may have been highly differentiated. The full-vein mine","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106594"},"PeriodicalIF":3.2,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trace elemental systematics of auriferous sulfides within the dolerites of northern Cuddapah Basin, southern India: Implications for invisible gold mineralization","authors":"Ramesh Chandra Behera ,&nbsp;Sahendra Singh ,&nbsp;Shalivahan Srivastava ,&nbsp;K.S. Vijay Kumar ,&nbsp;N. Ramakrishna Reddy ,&nbsp;Anmol Barla ,&nbsp;Rohit Pandey","doi":"10.1016/j.oregeorev.2025.106569","DOIUrl":"10.1016/j.oregeorev.2025.106569","url":null,"abstract":"<div><div>In the present work, the trace elemental systematics of the dolerite-hosted auriferous sulfides have been carried out to understand the nature of invisible gold mineralization within the northern part of Cuddapah Basin, southern India. The whole-rock geochemistry suggests that the dolerite is derived from a spinel peridotite mantle source and emplaced as a result of the intraplate magmatic activities. Within the dolerite, pyrite is the dominant phase associated with chalcopyrite and magnetite. Two types of pyrite phases are identified on the basis of their textures, i.e. Py1 and Py2. Py1 is anhedral to subhedral, whereas Py2 is euhedral. The Co/Ni ratio of Py1 and Py2 suggest their hydrothermal and volcanic origin, respectively. The gold vs arsenic plot indicates that gold occurs as solid solution within pyrite. Py1 is comparatively enriched in gold than Py2. Along with gold, other trace elements like As, Se, Ga, Ge, Sb, Te, and Ti are also present within these pyrite phases. The positive correlation of the gold with these trace elements indicates its solid solution nature. Py2 has a lesser content of gold than Py1, because of the higher ambient temperature. This work is the first report on the invisible gold occurrences within the dolerite hosted sulfides and provides new insights into the gold metallogeny of the northern Cuddapah Basin. The findings also contribute to the broader understanding of the trace elemental behavior in ore-forming processes, particularly in the context of invisible gold within sulfide minerals, which may have exploration implications in this region.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106569"},"PeriodicalIF":3.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics of ore-forming fluid and sources of ore-forming material in the Yangzhaiyu gold deposit, Xiaoqinling gold district","authors":"Tong Wu ,&nbsp;Jiajun Liu ,&nbsp;Emmanuel John M. Carranza ,&nbsp;Degao Zhai ,&nbsp;Ming Chang ,&nbsp;Chao Yin ,&nbsp;Dazhao Wang","doi":"10.1016/j.oregeorev.2025.106579","DOIUrl":"10.1016/j.oregeorev.2025.106579","url":null,"abstract":"<div><div>The Yangzhaiyu deposit is a large lode gold deposit in the Xiaoqinling region, along the southern margin of North China Craton, and it occurs mainly in the deep metamorphic gneiss series of the Taihua Supergroup. Researches based on petrography, micro-thermometry and Laser Raman analysis suggest that the homogenization temperature of ore-forming fluid was 216–346 ℃, the salinity was 6–8.7 %, with corresponding average density of 0.72–0.9 g/cm³. The ore-forming fluid was medium–high temperature, low salinity, CO₂-rich, and belonged to the CO₂–H₂O–NaCl system. From stages I to IV, the metallogenic temperature, salinity and pressure showed a decreasing trend. Fluid immiscibility may be the precipitation mechanism of native gold in the Yangzhaiyu gold deposit. The H–O isotopic values of fluids (δD_H2O = – 61 to – 51.8 ‰, δ¹⁸O_H2O = 2.7 to 6.9 ‰) in stage I to IV suggest that the ore-forming hydrothermal fluid may have been a multi-source mixed hydrothermal fluid such as metamorphic water, magmatic water and meteoric water, which was mainly derived from metamorphic water and magmatic water, meteoric water gradually added with the mineralization process. The He–Ar isotopic values of fluids (³He/⁴He = 0.63–1.2 Ra,⁴⁰Ar/³⁶Ar = 3978.6–5044.9) in stage I to IV suggest that the ore-forming fluid was a mixture of mantle source and crust source, mainly crustal source helium. With the progress of mineralization, the proportion of mantle source helium in the ore-forming fluid gradually decreases. The S isotopic values of sulfide (δ³⁴S_V-CDT = – 3.7 to 4.7 ‰, δ³⁴S_∑s = – 5.4 to 4.5 ‰) in stage I to IV suggest that δ³⁴S consistent with the characteristics of mantle-derived sulfur and the ore-forming sulfur may come from the Taihua Supergroup. The Pb isotopic values of sulfide (²⁰⁶Pb/²⁰⁴Pb = 17.015–17.158, ²⁰⁷Pb/²⁰⁴Pb = 15.394–15.524, ²⁰⁸Pb/²⁰⁴Pb = 37.481–37.91) in stage I to IV suggest that the ore-forming fluid was deep source mixed Pb from the mantle and the crust. The source of Pb in the deposit could be the Taihua Supergroup. The main mechanism of ore-forming fluid evolution was that the deep-source ore-forming fluid produced by crust-mantle interaction mixed with metamorphic hydrothermal fluid, meteoric water and other source fluids during upward migration in multiple stages during the whole ore-forming period. According to the geological, tectonic environment, fluid inclusions and isotopic data, combined with previous studies, the Yangzhaiyu gold deposit is considered as an orogenic gold deposit.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106579"},"PeriodicalIF":3.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into the petrogenesis of the Sudbury Igneous Complex and its giant Ni-Cu-PGE sulfide deposits from orthopyroxene mineral chemistry","authors":"Reid R. Keays ,&nbsp;Peter C. Lightfoot","doi":"10.1016/j.oregeorev.2025.106585","DOIUrl":"10.1016/j.oregeorev.2025.106585","url":null,"abstract":"<div><div>The world-class “contact” Ni-Cu-PGE sulfide deposits of the Sudbury Igneous Complex are associated with physical depressions termed “embayments” that occur at its base. Whereas some of the embayments are exceptionally well mineralized, others are poorly mineralized. The mineralization in the embayments in the northern part of the complex is associated with a fragment-rich unit referred to as the Sublayer which is overlain by a melanorite unit termed the Mafic Norite. This study aimed to establish whether the whole rock geochemistry of the Mafic Norite and the mineral chemistry of the orthopyroxenes in it could be used to discriminate between the well mineralized embayments and those that are not. The mineral chemistry of orthopyroxenes also helps to establish the origin of domains of melanorite that occur within the Sublayer.</div><div>The Mafic Norite samples from the well mineralized embayments have higher Ni and Cu grades than those of samples from the weakly mineralized embayments. The Ni tenors of the sulfides in the Main Mass Mafic Norite samples are also higher in the former than in the latter. The Ni contents of the orthopyroxene in Mafic Norite samples from the well mineralized embayments are higher than those of orthopyroxene in samples from the weakly mineralized embayments. Hence, whole rock and mineral chemistry data as well as the Ni contents of the sulfides all provide good discriminants between well mineralized and poorly mineralized environments in the Sudbury Ni-Cu-PGE sulfide camp. As orthopyroxenes are present in all of the rocks in the lower portion of the SIC, they provide a useful indicator of mineral potential.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106585"},"PeriodicalIF":3.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recurrent granite-related mineralization along former Tethys sutures in southwestern China","authors":"Fucheng Yang ,&nbsp;Rolf L. Romer ,&nbsp;Xiaojun Jiang ,&nbsp;Wenchang Li","doi":"10.1016/j.oregeorev.2025.106584","DOIUrl":"10.1016/j.oregeorev.2025.106584","url":null,"abstract":"<div><div>The sutures of the Paleo-Tethys, Meso-Tethys, and Neo-Tethys oceans in southwestern China host many major porphyry- and/or granite-related mineral deposits. We compile age and geochemical data from these deposits. The age data show that most of these deposits are not related to the formation of the sutures, but to their later tectonic reactivation. For instance, intrusion-related deposits along fault zones in the Sanjiang area, which represent the suture of the former Paleo-Tethys Ocean, fall in one of the four age groups: 239–206 Ma, 182–162 Ma, 126–70 Ma, and 53–32 Ma. The oldest group of major porphyry- and/or granite-related deposits in the Sanjiang zone is related to the subduction and closure of the Paleo-Tethys Ocean, whereas younger deposits formed during the reactivation of Paleo-Tethys sutures during the closure of the Meso-Tethys and the Neo-Tethys oceans and during the India–Asia collision. Different types of coeval porphyry- and/or granite-related deposits occur along different segments of the same crustal-scale structure and are related to different types of intrusions: Cu (<img>Mo), Cu<img>Au, Au, and Mo (<img>Cu) porphyry or skarn deposits are associated with relatively oxidized rocks that were derived from the melting of subduction-modified mantle with variable contributions from the crust and W<img>Mo and Sn<img>W deposits are related to highly evolved, reduced porphyries and/or granites that originated from partial melting of metasedimentary rocks. Although the inventory of sedimentary source rocks along the sutures is controlled by the geological development before the suture formed, the later reactivation of the suture determines which source rocks become available for melting and, thus, which type of mineralization may form along different reactivated segments.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106584"},"PeriodicalIF":3.2,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The geochemistry, origins and metallurgical implications of different textural types of spodumene-quartz intergrowths (SQUI) from the Tanco pegmatite, Manitoba, Canada","authors":"Catriona M. Breasley ,&nbsp;Tânia Martins ,&nbsp;Robert L. Linnen ,&nbsp;Claude Deveau ,&nbsp;Lee A. Groat ,&nbsp;Lot Koopmans ,&nbsp;Emilie Landry ,&nbsp;Desmond Moser","doi":"10.1016/j.oregeorev.2025.106577","DOIUrl":"10.1016/j.oregeorev.2025.106577","url":null,"abstract":"<div><div>The Archean Tanco deposit in southeastern Manitoba is a complexly zoned petalite-subtype pegmatite. Lithium mineralization primarily occurs as spodumene-quartz intergrowths (SQUI), which are historically interpreted as pseudomorphs of petalite breakdown. This breakdown would produce a spodumene-to-quartz ratio of 56.3:43.7 vol%, volume reduction textures, and low trace element contents. However, SQUI at Tanco shows variable spodumene-to-quartz ratios, remarkably little petalite preservation or volume reduction textures and green spodumene with up to 8330 ppm Fe.</div><div>Three textural varieties of spodumene-quartz associations were identified and described in zones 45 and 50 of the pegmatite: (1) Classic SQUI with c-axis-oriented, oscillatory-zoned spodumene and quartz, which locally occur within relict crystal outlines; (2) spodumene-quartz symplectites (SQS) characterized by pervasive symplectic intergrowths with elevated Cs and depleted Mn and Sn; and (3) macro spodumene-quartz intergrowths with randomly oriented, stubby crystals and chaotic zonation.</div><div>Metastable virgilite exists as a solid solution with quartz and is known to crystallize from experimental pegmatite crystallization studies. The breakdown of virgilite into classic SQUI could explain the lack of petalite and volume reduction textures, variable mineralogical ratios, and iron-bearing spodumene in SQUI. SQS likely resulted from coupled dissolution-reprecipitation in the presence of a fluid, while macro intergrowths represent primary magmatic textures. The occurrence of SQS at Tanco poses a metallurgical issue due to the fine sizes and hardness of the intergrowths leading to Li recovery issues. Understanding the origins of lithium mineralization is important as the quartz-spodumene textural associations have metallurgical recovery implications, affecting the overall economic viability of deposits.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106577"},"PeriodicalIF":3.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extremely Fe-rich beryl from Zhangji deposit: Implications for the unique volcanic fluid environment of beryllium mineralization in Southeast China","authors":"Mianmian Ding ,&nbsp;Xudong Che ,&nbsp;Can Rao ,&nbsp;Qi Wang ,&nbsp;Zhiqi Zhang ,&nbsp;Wei Li","doi":"10.1016/j.oregeorev.2025.106558","DOIUrl":"10.1016/j.oregeorev.2025.106558","url":null,"abstract":"<div><div>Beryl group minerals and bertrandite have been identified in the altered rocks of the Zhangji deposit in the volcanic intrusion complex of Southeast China. Complex internal textures and compositional variations characterise two groups of beryl (primary magmatic beryl and secondary hydrothermal beryl). The primary beryl (Brl-I) with low FeO^T (&lt;1.52 wt%), Na₂O (&lt; 0.27 wt%), and minor MgO (&lt;0.07 wt%) showed a regular hexagonal crystal shape, compositional rhythmic annulus, and a planar contact relationship with primary K-feldspars. With the action of hydrothermal fluids, two types of secondary beryl can be distinguished: (1) The Fe-, Mg-, and Na-rich beryl (Brl-II-1), with up to 5.74 wt% FeO^T, 2.60 wt% MgO, and 2.31 wt% Na₂O occurs along fractures in beryl crystals. (2) The extremely Fe-enriched beryl (Brl-II-2) has with up to 11.59 wt% FeO^T, 1.70 wt% MgO, and 1.53 wt% Na₂O and is related to extended metasomatism of Fe-rich fluids. Furthermore, the detailed textural study revealed that beryl evolved through reactions to form bertrandite, K-feldspar, and muscovite. Compared with primary K-feldspar which exhibited a clear contact boundary with surrounding minerals, secondary K-feldspar was adularia and lacked complete crystal form. In addition, compared with primary muscovite which was a long lamellar crystalline shape, secondary muscovite was distributed in clusters in beryl and showed as small grains with higher Fe content. Fe-rich beryl is rarely reported, to our knowledge, the extremely Fe-, Mg-, and Na-rich beryl in Zhangji deposit contains the second highest Fe content in the world, only lower than that found in Latium (Italy), of the metallogenic environment formed as a result of iron-rich and strong oxidation fluids. The strong volcanic magmatic activity during the Late Mesozoic formed a volcanic intrusion complex in Southeast China, this extremely Fe-rich beryl was formed in the special volcanic hydrothermal environment of the volcanic intrusion complex along Southeast China.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106558"},"PeriodicalIF":3.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magmatic-hydrothermal processes forming the Meishan iron oxide-apatite deposit in the Ningwu volcanic basin (Eastern China): Insights from trace element and Fe-O isotope data of magnetite","authors":"Wan-Ting Li ,&nbsp;Chuan-Yu Zhang ,&nbsp;Guang Wen ,&nbsp;Hao Hu ,&nbsp;Xin-Fu Zhao ,&nbsp;Jian-Wei Li","doi":"10.1016/j.oregeorev.2025.106576","DOIUrl":"10.1016/j.oregeorev.2025.106576","url":null,"abstract":"<div><div>Iron oxide-apatite (IOA) deposits are an important source for Fe that is variably accompanied by other elements such as P, Co, and REE. Still, their origin remains enigmatic, with existing models highlighting the role of magmatic, liquid immiscibility, magmatic hydrothermal processes, or a combination of those processes. Here we present new trace element and Fe-O isotope data of magnetite from the Meishan IOA deposit (338Mt iron-oxide ores) in Eastern China to further constrain the ore genesis. The Meishan deposit consists of disseminated, massive, and vein-type iron ores that are hosted within the Early Cretaceous andesitic rocks and, less significantly, in a coeval porphyritic gabbro-diorite intrusion. Petrographic and textural studies reveal six types of magnetite from the gabbro-diorite porphyry and various types of iron ores, and many of them show dissolution-reprecipitation textures. Trace element concentrations of magnetite, notably Ti, Al, Ga, and V, progressively decrease upwards, indicating a cooling trend likely from magmatic to hydrothermal conditions. A similar decreasing trend is also observed from magmatic magnetite in the ore-hosting rocks through massive and brecciated to the vein-type ores. Magnetite from the vein-type ores has δ⁵⁶Fe values of 0.14–0.41 ‰ and δ¹⁸O values of 4.38–5.53 ‰, which are similar to those for the gabbro-diorite porphyry (0.25–0.36 ‰ and 3.77–4.62 ‰) and for the massive ores (0.16–0.19 ‰ and 3.41–5.70 ‰), respectively. The above textural, elemental, and isotopic evidence indicate that the Meishan IOA deposit is of magmatic-hydrothermal origin and records repeated vents of hydrothermal fluids.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106576"},"PeriodicalIF":3.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Re-Os dating of manganese carbonate ores in Zunyi, Guizhou and implication for their genesis","authors":"Guodong Liu ,&nbsp;Yong Fu ,&nbsp;DaiZhao Chen ,&nbsp;Chuan Guo ,&nbsp;Feng Tian ,&nbsp;Chao Li ,&nbsp;Shuai Chao Wei ,&nbsp;Ran Jiang ,&nbsp;Shuang Yan ,&nbsp;Deng Chen ,&nbsp;Rui Chen","doi":"10.1016/j.oregeorev.2025.106565","DOIUrl":"10.1016/j.oregeorev.2025.106565","url":null,"abstract":"<div><div>The Emeishan Large Igneous Province (ELIP) activities of Middle Permian (260.1 ∼ 259.5 Ma) in the Upper Yangtze block, Southwest China induced large-scale crustal doming, re-organization of basin-platform configuration (or topography) and facies distribution of surrounding marine platform, relative sea-level changes, transition of source materials and fluxes as well as biotic turnover. Several Middle Permian marine sedimentary manganese deposits (MSMDs) precipitated in the intraplatform rift (or trough) surrounding the central doming region of ELIP in the Upper Yangtze block, notably in Zhunyi area, northeastern Guizhou, which was suggested to be linked to the ELIP activity; however, the temporal linkage was loosely constrained. To establish the causal linkage, direct Re-Os isotopic dating was carried out upon the manganese carbonates on the top of the Middle Permian Maokou Formation in Zunyi, Guizhou, yielding an isochron age of 262.8 ± 2.5 Ma, thus establishing a robust temporal connection to the ELIP activity. Additionally, the initial ¹⁸⁷Os/¹⁸⁸Os ratio is 0.537 ± 0.012, lower than that of the coeval seawater, indicating additional influx of submarine mantle-sourced hydrothermal fluids likely associated with the ELIP.</div></div>","PeriodicalId":19644,"journal":{"name":"Ore Geology Reviews","volume":"180 ","pages":"Article 106565"},"PeriodicalIF":3.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}