Geosystems and Geoenvironment最新文献

{"title":"Petrogenetic evolution of I-type granitoids in the Gouna region, Northern Cameroon: Geochemical evidence for subduction-related to post-collisional magmatism during the Pan-African orogeny","authors":"Mahamat Abakar ,&nbsp;Jacques Wassouo Wadjou ,&nbsp;Amadou Diguim Kepnamou ,&nbsp;Yaya Fodoué ,&nbsp;Jean Marcel Abate Essi ,&nbsp;Nguihdama Dagwai ,&nbsp;Ngounouno Isamaila","doi":"10.1016/j.geogeo.2025.100485","DOIUrl":"10.1016/j.geogeo.2025.100485","url":null,"abstract":"<div><div>The Gouna region, located in the northern part of the Pan-African belt in Cameroon, comprises a diverse suite of granitoids, including amphibole granites, amphibole–biotite granites, biotite granites, biotite–muscovite granites, and muscovite-bearing leucogranites. Deciphering their magmatic sources and tectonic evolution is key to understanding the geodynamic framework of the Pan-African Belt, which records the transition from subduction-related to post-collisional regimes during the Neoproterozoic.</div><div>This study integrates petrographic investigations of 25 thin sections, whole-rock geochemical analyses of 13 representative samples (11 granites and 2 quartz diorites), and new Sr–Nd isotopic data to constrain the petrogenetic evolution of the Gouna granitoids. The rocks are metaluminous, calc-alkaline, and magnesian (SiO₂ = 67.55–73.15 wt%; K₂O/Na₂O &lt; 1), characteristic of I-type granites emplaced under hydrous, oxidizing conditions. Isotopic compositions (⁸⁷Sr/⁸⁶Sr<span>ᵢ</span> = 0.7068–0.7072; εNd (540 Ma) = −4.8 to −6.2) suggest hybrid magma sources derived from a metasomatized enriched mantle with variable crustal assimilation.</div><div>Amphibole granites display weak REE fractionation ((La/Yb)_n = 0.64–1.68) and pronounced negative Eu anomalies (Eu/Eu* = 0.29–0.45), whereas muscovite-bearing leucogranites are highly fractionated ((La/Yb)_n = 17.30–33.71). Primitive mantle–normalized patterns show consistent negative anomalies in Nb, Ta, Ti, Pb, Sr, Y, and Hf, and enrichment in LILEs relative to HFSEs, reflecting a subduction-modified source.</div><div>The geochemical and isotopic data collectively record a polyphase magmatic evolution, marking the transition from arc-related mantle magmatism to syn- and post-collisional anatexis (600–540 Ma), and highlight progressive mantle–crust interaction during the Pan-African orogeny.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100485"},"PeriodicalIF":0.0,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peridotite pyroxenite and granulite xenoliths from Cenozoic Shavaryn Tsaram volcanic center (Mongolia): New data","authors":"I.V. Ashchepkov ,&nbsp;A.A. Tsygankov ,&nbsp;G.N. Burmakina","doi":"10.1016/j.geogeo.2025.100484","DOIUrl":"10.1016/j.geogeo.2025.100484","url":null,"abstract":"<div><div>Mantle lherzolites (spinel- and garnet-bearing), megacrysts and pyroxenites from Moho and lower crust xenoliths of the Cenozoic basalts of Shavaryn-Tsaram volcanic center were newly studied by the EPMA, SEM and LA-ICP methods to define more precisely their geochemical features for genetic purposes.</div><div>Thermal conditions in sampled mantle are close to the Southeastern Australian (SEA) mantle plume geotherm in 1.2–2.5 GPa divided into three intervals according to orthopyroxene-garnet barometry. The monomineral thermobarometry for ortho-, clinopyroxenes and garnets gives wider PT range to 3.0 GPa deviating to lower temperature clusters at 2–2.4 GPa. Black megacrysts show ascending from 3.0 to 1.0 GPa trend for pyroxenes and garnet accompanied by increase of Fe# for equilibrated with olivine (Ol) from 0.15 to 35 %. The intermediate Cr-bearing transitional pyroxenites are locating between the lherzolitic and black pyroxenite trends. They are referring to the primitive or slightly depleted associations according to petrographic and trace element (TRE) compositions. According to TRE of clinopyroxenes from spinel peridotites were divided into 5 groups: primitive, slightly depleted, deeply depleted; metasomatized by light rare earth (LREE); rich-Th-U (reactions with carbonatite melt) and in addition rare garnet-bearing types. Orthopyroxenes reveal decreasing to LREE straight line REE patterns and in TRE spiderdiagrams U, Ta and high Hf peaks. Some clinopyroxenes have Sr peaks and jagged left part of multicomponent spiderdiagrams (MSD). Olivines show and concaved from Eu to Tm in spider diagrams they reveal minima in Th, Nb, Pb, Zr. The Cr- bearing amphiboles reveal slightly inclined to LREE pattern at 90–60/CI (chondrite). And garnet show LREE depleted patters from Lu at 10/CI to 0.1 for La and depleted all left part at spider diagram, The pyroxenitic clinopyroxenes have flattened REE pattern or rarely depleted in heavy (HREE) and the hump from La to Sm. They reveal minima in Zr, Hf, Sr, Pb and left part starting from Nb. Garnets in black pyroxenites have higher HREE at 80/CI (chondrite) and Hf peaks and lowered jugged left part in MSD. The clinopyroxenes from black garnets pyroxenites reveal asymmetric bell- like REE with the depleted HREE to 1/CI and middle rare earth (MREE) at 12/CI. The clinopyroxenes from plagioclase-bearing varieties show flattened REE pattern at 100–80/CI and Eu minima and the MSD for megacrystic pyroxenes. Rare mantle metasomatites contain mica or amphiboles and are LREE enriched. Peridotites from Shavaryn Tsaram have no signs of essential mantle diapirism and represent ancient MORB mantle.</div><div>Determined with LA-ICP-MS age of zircon in granulite 322 ± 8 Ma refer to rifting processes in Central Mongolia and be-modal volcanism while 42 ± 0.4 Ma to Early Cenozoic plume magmatism.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100484"},"PeriodicalIF":0.0,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical characterization of water in the Kadey watershed (Central Africa): An approach to the dynamics of groundwater/surface water exchanges","authors":"P.S. Kouassy Kalédjé ,&nbsp;A. Njueya Kopa ,&nbsp;C.G. Belinga Mboussame ,&nbsp;Z. Mfonka ,&nbsp;L. Kengni ,&nbsp;J.-R. Ndam Ngoupayou","doi":"10.1016/j.geogeo.2025.100482","DOIUrl":"10.1016/j.geogeo.2025.100482","url":null,"abstract":"<div><div>The Kadey watershed, a hydrogeochemical system in a quasi-isotropic fissured basement environment, presents distinct groundwater/surface water exchange functions. The analysis and interpretations of hydropluviometric, hydrodynamic, and hydrochemical data are used to understand these exchanges and their impact on the hydrodynamic behavior of the system. The results reveal that the watercourse and groundwater act as communicating vessels, with the direction of flow depending on the season. It also found that the river water and the groundwater predominantly originate from rain, as indicated by a principal components analysis (PCA). The first results show that the waters of the Kadey watershed are acidic (5.85 &lt; pH &lt; 6.17) and very weakly to weakly mineralized (18 &lt; CE &lt; 140 µS/cm) with two dominant facies: calcium-magnesium bicarbonate (HCO3-Ca-Mg) and the sodium-potassium bicarbonate facies (HCO₃-Na-K). Several environmental factors control the quality of the waters of this basin: lithology, anthropogenic activities and climate. It is also at the origin of the noted presence of ETMs (Fe &gt; Mn &gt; Pb &gt; Cr &gt; Cu &gt; Zn &gt; Cd &gt; As &gt; CN) in the groundwaters of the locality. These insights contribute to the understanding of water exchange mechanism and have implications for the management of water resources in the Kadey watershed.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100482"},"PeriodicalIF":0.0,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrating satellite observations, coral Sr/Ca proxies, and model simulations to analyze sea surface temperature variability (1915-2003) in Indonesia","authors":"Adinda Maharani ,&nbsp;Rima Rachmayani ,&nbsp;Adnya P.P. Pratiwi ,&nbsp;Zulfikar Kartadimaja ,&nbsp;Mutiara R. Putri ,&nbsp;Ivonne M. Radjawane ,&nbsp;Susanna Nurdjaman ,&nbsp;Lamona I. Bernawis ,&nbsp;Suliskania Nurfitri","doi":"10.1016/j.geogeo.2025.100481","DOIUrl":"10.1016/j.geogeo.2025.100481","url":null,"abstract":"<div><div>Coral reefs are vital indicators of past oceanic conditions due to their ability to record environmental changes in their calcium carbonate structures. Specifically, the strontium-to-calcium ratio (Sr/Ca) in coral skeletons serves as a reliable proxy for reconstructing SST over time. The purpose of this study is to evaluate the similarity between sea surface temperature (SST) variability simulated by climate models and actual observations. The study utilized a comprehensive dataset that integrates satellite-derived SST observations and Coupled Model Intercomparison Project Phase 5 (CMIP5) model simulations with coral Sr/Ca records from three locations in Indonesia: Gili Selang, Kupang, and Nusa Penida. Based on the result, CCSM4 is the model with high robustness for simulation the sea surface temperature variability in Indonesia. CCSM4 has a higher correlation than other models when comparing data SST with OISST satellite and Sr/Ca record, whose correlation values are 0.7 and 0.32. The phases of ENSO and IOD exhibit a weak relationship with sea surface temperature (SST) distribution in the Indonesian region, as indicated by the low correlation values in the spatial correlation maps with CCSM4. These low correlation values suggest that the ENSO and IOD phenomena have a minimal impact on SST variability over Indonesia, as simulated by the CCSM4 model. The correlation coefficients between CCSM4 SST and the Niño index and Dipole Mode Index (DMI) during the two periods range from -0.213 to 0.055. Moreover, CCSM4 often simulates SST responses that are opposite to the expected effects of ENSO and IOD phases. These results indicate that, despite its relative strength among CMIP5 models, CCSM4 still lacks sufficient accuracy in reproducing the regional impacts of ENSO and IOD on SST variability in the Indonesian seas.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100481"},"PeriodicalIF":0.0,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145685279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Astronomical and greenhouse gas configuration from past to future simulation: An analysis of sea surface temperature's impact on sea levels in Indonesia","authors":"Rima Rachmayani ,&nbsp;Nabilah Shafira Milennianti","doi":"10.1016/j.geogeo.2025.100480","DOIUrl":"10.1016/j.geogeo.2025.100480","url":null,"abstract":"<div><div>Climate change and steric variables influence sea level rise in the modern era. This study used the Community Climate System Model version 4 (CCSM4) to compare sea surface temperature (SST) and sea level height (SSH) in Indonesia during the mid-Holocene (MH), pre-industrial (PI), and future periods in 2300 with Representative Concentration Pathways 8.5 (RCP8.5). The results show that the average SST value is lower in the MH, with a change in values of around −1°C in the MAM season and increases in the future by around 2°C, whereas the average SSH value is lower in the MH with a change in values of around −0.1 m during the SON season in Western Sumatra and increases in the future over the SON season by around 0.1 m in Northern Papua, compared to PI. The average correlation between the two metrics is positive, with values of 0.55 (MH-PI) and 0.8 (RCP8.5-PI). SST and SSH climatological patterns in Western Sumatra, the Banda Sea, and Northern Papua reveal that SST and SSH fall during the JJA season and increase during the SON season, respectively. This fluctuation is produced by either a lag in insolation or the winter remnant effect. Signal analysis with Fourier transform reveals that the major signal spectrum for changes in SST and SSH is contributed by annual and semi-annual periodicity in the three regions. A notable interannual periodicity exists; however, it is not predominant, leading to variable interannual influences on SST and SSH in Indonesia.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100480"},"PeriodicalIF":0.0,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced machine learning based gold prospectivity mapping in the Dharwar Craton, India: A hybrid knowledge-data driven paradigm integrating ensemble and deep learning","authors":"Soumya Mitra ,&nbsp;Saptarshi Mallick ,&nbsp;Santu Biswas ,&nbsp;Kshounish Patra","doi":"10.1016/j.geogeo.2025.100473","DOIUrl":"10.1016/j.geogeo.2025.100473","url":null,"abstract":"<div><div>Developing more sophisticated as well as efficient exploration methods to identify the hidden ore bodies are necessary to meet the world wide increasing demand of mineral resources. In this regard, mineral prospectivity mapping (MPM) is crucial. This study undertakes a pioneering effort to apply and compare four machine learning (ML) models—random forest (RF), XGBoost (XGB), support vector classifier (SVC) and artificial neural network (ANN)—for gold prospectivity mapping within the Archean Dharwar Craton, India. The primary goals included the development and evaluation of these models, a systematic assessment of their comparative performance through cross-validation, feature important analysis and ultimately, production of prospectivity map. The culmination of this work is a high-resolution, combined prospectivity map, designed to produce a new prospectivity areas. Diverse geospatial data was meticulously integrated as per mineral system of the area, including geological maps, structural lineaments, geochemical, geophysical and ASTER remote sensing imagery. For model training, 79 known gold occurrences were carefully collected alongside an equal number of selected non-occurrence locations, framing the task as a supervised binary classification problem. Rigorous evaluation, employing 5-fold cross-validation and a 70:30 train-test split, confirmed the exceptional capabilities of these models. XGB and RF consistently emerged as top performers, with impressive AUC-ROC values of 0.9992 and 0.9965, respectively, coupled with high precision, recall and F1-scores and few false positives or negatives. While ANN also showed excellent performance, SVC, though strong, yielded comparatively lower metrics. A detailed feature importance analysis exhibits the positive role of Meta-Basalt, geochemical principal component 1 and Bouguer gravity anomaly and its derivative maps. Success-rate curves vividly illustrated the models' efficiency capturing over 76% of known occurrences within just 20% of the highest-ranked areas shows targeting precision. The generated combined prospectivity map, a robust synthesis from XGB, RF and ANN, based on a stringent consensus criterion validates existing knowledge and precisely delineates high-priority exploration targets, fundamentally reshaping the approach to future mineral exploration.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100473"},"PeriodicalIF":0.0,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the trend of dry spells and how ocean factors affect their patterns during the summer monsoon in Bangladesh using the Mann-Kendall and frontier atmospheric general circulation model","authors":"Md. Moniruzzaman Monir ,&nbsp;Subaran Chandra Sarker ,&nbsp;Md. Mostafizur Rahman ,&nbsp;Md. Nazrul Islam","doi":"10.1016/j.geogeo.2025.100472","DOIUrl":"10.1016/j.geogeo.2025.100472","url":null,"abstract":"<div><div>To assess drought risk, susceptibility to food security, and water resource utilization, it is crucial to comprehend dry spell patterns from a hydrological perspective. Some regional studies have noted an extension of dry spells on a global and regional scale, but it is still unclear how often dry spells occur during the summer monsoon season, which is dominated by rainfall. This study uses the Mann-Kendall trend test to examine the trend of dry spells during Bangladesh's summer monsoon from 1985 to 2022 to close this gap. Using the frontier atmospheric general circulation model and remote sensing methods to examine the effects of ocean elements such as Indian Ocean Dipole (IOD), sea surface temperature (SST), El Niño-southern oscillation (ENSO) conditions, and the zonal wind. Daily rainfall data for 34 weather stations were obtained from the Bangladesh Meteorological Department, while surface water occurrence and change intensity data were retrieved from the JRC Global Surface Water Mapping Layers, v1.3 (FAO, UN). The NOAA Physical Sciences Laboratory (PSL) and the Tokyo Climate Center/WMO Regional Climate Centre in RA II (Asia) provided the IOD, SST, ENSO, and zonal wind data. A notable dry spell anomaly over Bangladesh was also observed in this research, with short, medium-length, and long dry spells increasing at 82.35 %, 73.53 %, and 50 % of the weather stations, respectively. Dry spells become less frequent during El Niño but more during La Niña. The climatic variability of IOD events and SST anomalies in the eastern and western tropical Indian Ocean was also noted by this study to be connected to these anomalous events. The correlation coefficient between summer monsoon rainfall and DMI is 0.34. Throughout the study period, there were changes in the upper atmosphere's and lower troposphere's wind circulation. The study allows the prioritization of regions for drought, effective water resource management, and food scarcity preparedness.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100472"},"PeriodicalIF":0.0,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prioritization of sub-watersheds based on hydro-morphometric assessment in relation to soil erosion: A case study in Haora Drainage Basin, Tripura","authors":"Sudipta Pal,&nbsp;Nibedita Das Pan","doi":"10.1016/j.geogeo.2025.100471","DOIUrl":"10.1016/j.geogeo.2025.100471","url":null,"abstract":"<div><div>Among all the environmental issues of the world, soil erosion is of significant concern in terms of watershed management. For proper planning and management of watersheds in terms of soil erosion, characterization and prioritization of sub-watersheds (SWs) through appropriate techniques is crucial. Thus the present study focuses on prioritizing the erosion prone sub-watersheds of Haora Drainage Basin, Tripura using Hydro-Morphometric analysis. Remote sensing (RS) and geographical information system (GIS) play a vital role for providing cost-effective and accurate data of the study area. The generation of drainage networks and delineation of sub-watersheds has been done using ASTER DEM of 30 m resolution in the Arc-GIS 10.8 software. On one hand, nineteen vital morphometric parameters among the linear, areal and relief aspects in relation to soil erodibility were computed using pre-defined mathematical formulae and methods using the DEM and on the other hand, field surveys with necessary equipment for three consecutive water years (2021–2024) helped in evaluating six important hydrological parameters. The study area consists of nine sub-watersheds in order of SW1-SW9. The prioritization of the sub-watersheds has been done on the basis of compound value of each sub-watershed calculated by using the Preliminary Rankings of the parameters and weighted sum approach (WSA). As a result, SW5, SW7 and SW3 have been categorized into high priority and SW9 and SW1 comes under moderate priority. Four sub-watersheds namely SW6, SW4, SW8 and SW2 have been assigned low priority, suggesting that these are more sustainable than others. The study provides scientific information for decision makers toward effective soil and watershed management.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100471"},"PeriodicalIF":0.0,"publicationDate":"2025-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of structurally controlled potential mineralization zones in Chhotanagpur Gneissic Complex, Eastern India from gravity and magnetic data","authors":"Afaque Karim ,&nbsp;Anurag Tripathi ,&nbsp;Upananda Low ,&nbsp;Mohd Tabish Ansari ,&nbsp;Deepak Yadav ,&nbsp;Kashi Nath Prasad","doi":"10.1016/j.geogeo.2025.100470","DOIUrl":"10.1016/j.geogeo.2025.100470","url":null,"abstract":"<div><div>The present study delineates zones of potential mineralization within the Chhotanagpur Gneissic Complex (CGC) using integrated geophysical methods. Comprehensive gravity and magnetic surveys were conducted across ∼3500 km² revealing seven high–priority blocks characterized by distinct Bouguer gravity anomalies (–46 to –19 mGal) and magnetic intensity variations (–246 to +710 nT). These geophysical anomalies are linked to surface lithologies like mica–schist belts, amphibolites and intrusive bodies which are indicative of economically significant mineral deposits. In this study, structural analysis highlights NE–SW and NW–SE trending lineaments and faults that may play a key control on mineralization in the area. Depth estimations from radially averaged power spectrum (RAPS) and Euler 3D solutions shows causative bodies are deeper (∼4 km) in western region than the eastern region (∼1–2 km). The integration of geophysical data with geological interpretations enhances understanding of the CGC in the context of possible influence on mineralization processes. The present findings provide a strategic pathway for guiding further mineral exploration initiatives in seven potential zones identified in the study area.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"5 2","pages":"Article 100470"},"PeriodicalIF":0.0,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stage of the vein series formation processes of the Burpala massif (North Baikal), according to chemical microprobe Th-U-Pb dating of monazites","authors":"Irina Sotnikova ,&nbsp;Anna Spivak ,&nbsp;Alla Viryus ,&nbsp;Michael Kuzmin ,&nbsp;Egor Zakharchenko ,&nbsp;Tatiana Kolotilina ,&nbsp;Natalia Alymova","doi":"10.1016/j.geogeo.2024.100345","DOIUrl":"10.1016/j.geogeo.2024.100345","url":null,"abstract":"<div><div>The typomorphic features and ages of monazites from two zones of ore-bearing pegmatites of the Burpala massif (Western and Britolite) were studied. This made it possible to clarify the stages of formation of the vein phase of the intrusive rocks. Information on the relationship of monazites with rock-forming and ore minerals was also obtained. Using the CHIME method, the isochronous Th-U-Pb age of monazites from rare-metal pegmatites was calculated: 287 ± 54 Ma (Western zone) and 273 ± 69 Ma (Britholite zone). The obtained age values for the rare-metal pegmatites of the Burpala massif are in good agreement with the available geological and geochronological information and indicate the existence of several stages of their formation, which allows us to supplement the magmatism scheme of the vein complex (mariupolites → foyaites → rare-metal pegmatites of the Western zone → rare-metal pegmatites of the Britholite zone → apatite-fluorite rocks → carbonatites→ alaskites and alkaline granites). The obtained age for monazites from two zones of pegmatites is close by time of formation to the pulaskites of the main phase and rare-metal pegmatites of the North-Western zone of the Burpala massif and belongs to the general Late Paleozoic stage of intraplate magmatism in the northern framing of the Angara-Vitim batholith.</div></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"4 4","pages":"Article 100345"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}