Journal of Geochemical Exploration最新文献

{"title":"Distribution dynamics and health risks of polyaromatic hydrocarbons and heavy metals in the anthropogenically impacted Omi-Asoro Stream, Nigeria","authors":"Adebanjo Jacob Anifowose ,&nbsp;Gideon Temitope Arowosaye ,&nbsp;Oluwaseyi Esther Adaramodu ,&nbsp;Esther Oluwaponmile Akintola ,&nbsp;Jesufunmilayo Abosede Otunniya ,&nbsp;Adedoyin Demilade Makinde ,&nbsp;Tesleem Olalekan Kolawole ,&nbsp;Shola Hezekiah Awojide","doi":"10.1016/j.gexplo.2025.107675","DOIUrl":"10.1016/j.gexplo.2025.107675","url":null,"abstract":"<div><div>The study carried out concerted analytical measurements of twenty polyaromatic hydrocarbons (PAHs) and eighteen heavy metals in the Omi-Asoro Stream, Ilesa, Nigeria to unravel their sources and the impacts of anthropogenic activities around it. Samples from the stream water were collected in March 2023. The resident PAHs were subjected to solid-phase extraction (SPE) and analyzed on a gas chromatograph-mass spectrometer. The acid-extracted heavy metals were also analyzed with an inductively coupled plasma-optical emission spectrometer (ICP-OES). Results showed that naphthalene (6.00 ± 7.79 μg/L) and fluoranthene (2.99 ± 4.24 μg/L) were the two dominant PAHs in the stream water. Similarly, Fe and Zn, with concentrations (μg/L) of 1291 ± 2361 and 53.1 ± 89.3, respectively, were the dominant heavy metals. Fe concentration constituted 84.4% of the total heavy metals in the water. Using principal component analysis (PCA), the PAH sources were traced to internal combustion engines, biomass burning, and pesticides/wood preservatives. The heavy metal sources were resolved to internal combustion of engines, metallic wear/rust, electronic devices, geogenic releases and agrochemicals. The risk assessment showed that among the detected PAHs, benzo(<em>a</em>)pyrene constituted a carcinogenic effect on humans. The heavy metals which posed carcinogenic effects included As, Ni, Cd and Cr. Thus, the industrial and agricultural activities, as well as emissions from the internal combustion of engines in the area released the environmental pollutants which adversely impacted the stream.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"271 ","pages":"Article 107675"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182302","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":"Unsupervised detection of multivariate geochemical anomalies using a high-performance deep autoencoder Gaussian mixture model","authors":"Xuemei Wang,&nbsp;Yongliang Chen","doi":"10.1016/j.gexplo.2025.107671","DOIUrl":"10.1016/j.gexplo.2025.107671","url":null,"abstract":"<div><div>It is of great significance to construct an efficient geochemical anomaly detection model for the successful accomplishment of a mineral exploration process in a complex geological environment. However, the complex geological environment of the prospecting area often results in the high-dimensional unknown complex population distribution of geochemical exploration data. This complex distribution is difficult to fit with a theoretical probability distribution model. As a result, it becomes a challenge to carry out an effective detection of geochemical anomalies. Therefore, to develop an anomaly detection model that can effectively fit the complex population distribution of geochemical exploration data is the key for accurately detecting geochemical anomalies. For this reason, the deep autoencoder Gaussian mixture model (DAGMM) was adopted to model the geochemical exploration data obtained in the 1:200,000 geological survey conducted in the Baishan area (Jilin, China) to check its superiority in identifying multivariate geochemical anomalies. As an innovative deep learning framework for unsupervised anomaly detection, DAGMM ingeniously combines the data dimensionality reduction and compression capabilities of a deep autoencoder (DAE) with the probability density estimation advantage of the Gaussian mixture model (GMM). The DAGMM model can deeply explore the deep-level features of geochemical exploration data and effectively model the complex unknown data distribution through the synergistically work and joint optimization strategy in training the DAE and GMM model, so it can accurately identify geochemical anomalies. To show the superiority of the DAGMM model in detecting polymetallic geochemical anomalies, the DAGMM model was compared with the GMM and DAE models. The receiver operating characteristic (ROC) curves of the three models were plotted, and the areas under the ROC curves (AUCs) and lift indices were calculated. The ROC curve of the DAGMM model dominates that of the DAE model and GMM model. The DAGMM model has an AUC of 0.904 and a lift index of 10.44, respectively, which are much larger than those of the GMM model (AUC = 0.858, lift index = 3.63) and DAE model (AUC = 0.83, lift index = 5.31). Therefore, the DAGMM model significantly outperforms the other two models in detecting multivariate geochemical anomalies and the polymetallic geochemical anomalies detected by the DAGMM model contain all the known polymetallic deposits. Compared with DAE and GMM, DAGMM is more efficient and more powerful in detecting multivariate geochemical anomalies in complex geological environments.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"271 ","pages":"Article 107671"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182303","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":"Modeling mineralization potential of catchment basins: Insight from geochemical fingerprint","authors":"Haicheng Wang ,&nbsp;Ruiwen Shen ,&nbsp;Liuan Duan ,&nbsp;Qiuming Cheng ,&nbsp;Zhaoxian Yuan ,&nbsp;Shengyuan Zhang","doi":"10.1016/j.gexplo.2025.107669","DOIUrl":"10.1016/j.gexplo.2025.107669","url":null,"abstract":"<div><div>Stream sediments are common sampling media in cost-effective regional exploration programs. Catchment basins are the basic sampling units of steam sediments, which have distinct geochemical characteristics. In this study, the mineralization potential of catchment basin using stream sediments is evaluated from the perspective of geochemical fingerprints. Firstly, the spatial distribution of catchment basins was acquired based on digital elevation model data. The local singularity analysis was employed to reduce the impact of the overburden, revealing the weak geochemical anomalies. The catchment basins with known mineral occurrences as the prior dataset were used to train the random forest model, which improved the model accuracy and interpretability. The geochemical fingerprints of different types of mineralization were constructed based on the importance of geochemical variables in the random forest modeling, which revealed the importance of geochemical elements for different types of mineralization occurrences. All catchment basins lacking mineral occurrences were categorized based on the trained random forest model, achieving the potential types of mineralization for each catchment basin. Most of catchment basins with the same types of mineralization occurrences exhibited the spatial cluster, suggesting the migration characteristics of metal element in stream sediments through river system. Geochemical fingerprinting is a valuable tool for classifying the different types of mineralization occurrences at the scale of catchment basins. The delineated potential mineral occurrence types for catchment basins provided an indicator for future mineral exploration endeavors.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"271 ","pages":"Article 107669"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182304","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":"Uptake and toxicity of heavy metals: The protective frontiers of metal binding proteins","authors":"Ravneet Kaur,&nbsp;Harleen Kaur,&nbsp;Ashish Sharma","doi":"10.1016/j.gexplo.2025.107673","DOIUrl":"10.1016/j.gexplo.2025.107673","url":null,"abstract":"<div><div>In environment, several contaminants and pollutants are released, the content of which is increasing alarmingly. Out of several contaminants released into environment, one such contaminant is heavy metals. Such contaminants being released into the environment then enter into plant system via soil. Plants uptake heavy metals from soil via apoplast symplast continuum. Plant require several nutrients in minute concentrations however presence of such nutrients in excess cause toxic effects on plants. Such heavy metals caused varied toxicities such as chlorosis, impaired photosynthesis, lipid peroxidation etc. in plants resulting in overall decline in plant biomass. Excess concentration of heavy metals such as copper, chromium, nickel are known to induce morphological, physiological deformities in several plant species. In response to ROS generated due to heavy metal toxicity, plants activate several defense mechanisms. In addition to this, several metal binding proteins such as metallothioneins, phytochelatins, glutathione etc. are activated. These metal binding protein act to reduce the toxic effects of heavy metals by binfing to them and sequestering then into vacuoles. The current review will highlight the uptake mechanism of heavy metals by plants, toxicity caused by some commonly occurring heavy metals in plants and role of metal binding proteins in sequestering such heavy metals.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"271 ","pages":"Article 107673"},"PeriodicalIF":3.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181099","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":"Using principal component analysis to distinguish sources of radioactivity and nitrates contamination in Southern Tunisian groundwater samples","authors":"Tiziano Boschetti ,&nbsp;Younes Hamed ,&nbsp;Rihab Hadji ,&nbsp;Maurizio Barbieri ,&nbsp;Matteo Gentilucci ,&nbsp;Mattia Rossi ,&nbsp;Rayan Khalil ,&nbsp;Shuhab D. Khan ,&nbsp;Bassem Asghar ,&nbsp;Abdulrasoul Al-Omran ,&nbsp;Elimame Elaloui","doi":"10.1016/j.gexplo.2025.107670","DOIUrl":"10.1016/j.gexplo.2025.107670","url":null,"abstract":"<div><div>The manuscript discusses using Principal Component Analysis (PCA) to distinguish the sources of radioactive and nitrate contamination in 33 groundwater samples from southern Tunisia. The study focuses on the Gafsa basin, an area known for its phosphate mining activities and significant agricultural use, both of which contribute to the contamination of groundwater resources. The radioactivity in the water is primarily attributed to phosphate mining and deep groundwater sources from the North Western Sahara Aquifer System (NWSAS). Additionally, the nitrate contamination is largely due to agricultural runoff, though secondary sources related to phosphate mining are also considered.</div><div>Through the application of PCA, the study was able to classify the groundwater samples into different groups based on their contamination sources: phosphate mining, combined agricultural and mining activities, fossil geothermal waters, and low-agricultural areas. The PCA revealed that samples most affected by anthropogenic activities exhibited high levels of radium and nitrate, with contamination patterns correlating with specific environmental and chemical factors.</div><div>This analysis underscores the complexity of groundwater contamination in the region and highlights the need for targeted mitigation strategies to address radioactive and nitrate pollution in southern Tunisia. The study provides critical insights for managing water quality in areas with similar environmental challenges.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"271 ","pages":"Article 107670"},"PeriodicalIF":3.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181101","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":"Corrigendum to “Assessment of potentially toxic elements in some wild edible plants of district Doda, Jammu and Kashmir, India” [J. Geochem. Explor. 267, p. 107604. (Dec 2024)]","authors":"Sania Hamid ,&nbsp;Devendra Kumar Pandey ,&nbsp;Deepika Singh","doi":"10.1016/j.gexplo.2024.107668","DOIUrl":"10.1016/j.gexplo.2024.107668","url":null,"abstract":"","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"270 ","pages":"Article 107668"},"PeriodicalIF":3.4,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164552","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":"Vectoring towards buried high-purity quartz metapegmatites using low-elevation radiometric and soil geochemical surveying: Method validation in Tysfjord, Norway","authors":"Mario Hopfner ,&nbsp;Marco Brönner ,&nbsp;Lawrence Carter ,&nbsp;Teimoor Nazari-Dehkordi ,&nbsp;Julian Menuge ,&nbsp;Axel Müller ,&nbsp;Ben Williamson","doi":"10.1016/j.gexplo.2024.107667","DOIUrl":"10.1016/j.gexplo.2024.107667","url":null,"abstract":"<div><div>Group 2/NYF pegmatites may be economically enriched in rare minerals. In this study we report testing of two exploration methods, gamma ray surveying and soil geochemical mapping, undertaken within the GREENPEG project. Palaeoproterozoic metapegmatites in the Tysfjord area, Nordland, Norway, include some which have been mined for pure quartz. Geologically, the ore zones are the quartz cores of metapegmatites whose other zones and metasomatic halos are enriched in U, Th, REE, Nb and other rare elements. The Jennyhaugen metapegmatite was the main test site because its subcrop beneath 0.1–1.0 m soil can be traced from an open pit mine, and aerial surveying is unobstructed by trees. Helicopter-borne radiometry at 60 m altitude and drone-borne radiometry at 25–35 m altitude detect the metapegmatite, while walking (1.0 or 1.6 m height) and 15 m altitude drone-borne radiometry resolve the metapegmatite and metasomatic halo subcrop in detail. Total gamma ray count measurements provide as good an exploration tool as Th or U radiation; K radiation does not show useful anomalies. Both A- and C-horizon soil geochemical mapping also reveal U, Th, Nb and other geochemical anomalies above metapegmatite and halo subcrop. A-horizon soil samples appear to more accurately locate these targets, perhaps because they effectively sample larger surface areas of subcropping rock, whose grain size is very coarse (typically metre scale) within the metapegmatite. C-horizon samples collected from the soil-rock interface are less likely to be representative of the metapegmatite. Gamma ray surveying is recommended rather than soil chemical mapping for exploration, by helicopter at district scale and by drone or walking at prospect scale. It is quicker, requires less field workers, has higher resolution and is less expensive than soil geochemical mapping. Soil chemistry may be preferred for prospect-scale exploration, however, where the commodity sought does not spatially correlate with U and/or Th concentrations.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"270 ","pages":"Article 107667"},"PeriodicalIF":3.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164546","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":"Ore-forming processes of giant carbonate-hosted ZnPb deposit and Ge enrichment mechanism in Zhugongtang, Guizhou Province, China: Constraints from trace element and isotopic compositions of sulfides","authors":"Qing Yang ,&nbsp;Shao-Yong Jiang ,&nbsp;Suo-Fei Xiong ,&nbsp;Jun-Jie Hou","doi":"10.1016/j.gexplo.2024.107666","DOIUrl":"10.1016/j.gexplo.2024.107666","url":null,"abstract":"<div><div>The Zhugongtang Zn<img>Pb deposit, with &gt;3.27 million tons of Zn + Pb averaging 6.76 % Zn and 2.27 % Pb, along with 592 tons of Ge, is a newly discovered giant Zn<img>Pb deposit in northwest Guizhou Province of the Sichuan-Yunnan-Guizhou metallogenic region, Southwest China. This deposit is hosted in Devonian, Carboniferous, and Permian carbonate rocks. Three stages of hydrothermal mineralization were identified: (1) the pyrite-sphalerite-quartz stage, (2) the sphalerite-galena-pyrite-calcite stage, and (3) the carbonate stage, and three generations of sphalerite (Sp-1, Sp-2, and Sp-3) were identified. In this study, analyses of in situ trace element compositions in sphalerite and S<img>Pb isotopic compositions of sulfides were conducted to determine the origin and mineralization processes of the Zhugongtang deposit. Sphalerite is characterized by enrichment of Ge (mean = 109 ppm), Cd (mean = 875 ppm), and Ga (mean = 30 ppm) and depletion of In, Sn, and Co, with increasing Ge and Cu and decreasing Mn, Ag and Pb from the early to late stages. Ge incorporates into sphalerite via a coupled substitution of 3Cu⁺ + Sb³⁺ + Ge⁴⁺ ↔ 5Zn²⁺. The temperature and sulfur fugacity (<em>f</em>S₂) are estimated from the trace element concentrations in sphalerite, which indicate medium- to low-temperature and intermediate-sulfidation conditions with decreasing temperature and <em>f</em>S₂ from Sp-1 to Sp-3. The pyrite, sphalerite, and galena have δ³⁴S values ranging from 11.3 to 17.8 ‰, 10.2 to 17.3 ‰, and 8.4 to 14.7 ‰, respectively, indicating that the reduced sulfur likely originated from the thermochemical reduction of sulfate (TSR) with multiple sources. High-precision in situ Pb isotope ratios of ²⁰⁸Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, and ²⁰⁶Pb/²⁰⁴Pb range from 39.609 to 40.230, 15.860 to 16.042, and 18.768 to 18.984, respectively, which implies that the lead was sourced primarily from the host rock and basement strata. On the basis of a comprehensive analysis of ore geology and geochemical data, the Zhugongtang deposit is classified as an MVT deposit. With the gradual decrease in temperature and <em>f</em>S₂, sphalerite (Sp-2 and Sp-3) precipitated in large quantities with significant enrichment of Ge (mean 147 ppm).</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"270 ","pages":"Article 107666"},"PeriodicalIF":3.4,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164047","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":"Global distribution and sources of uranium and fluoride in groundwater: A comprehensive review","authors":"C.N. Sridhar ,&nbsp;M. Thirumurugan ,&nbsp;T. Subramani ,&nbsp;P. Gopinathan","doi":"10.1016/j.gexplo.2024.107665","DOIUrl":"10.1016/j.gexplo.2024.107665","url":null,"abstract":"<div><div>Contamination of elements in water due to geogenic and anthropogenic activities is common around the world. Intake of contaminated water causes severe health hazards to the living community. To avoid the health hazards, World Health Organisation (WHO) has specified certain limit of the level of elements as well as ions present in the water for drinking purpose. Some common chemical contaminates in the groundwater are Uranium (U) and Fluoride (Fˉ). The intake of groundwater which is having excess amount of Uranium (U) and Fluoride (Fˉ) may lead to serious health issues. The permissible level of Uranium in water as is 30 ppb as per WHO, but in some regions due to the rock type, mining activity, chemical waste; the level of U present in water might be higher than the prescribed limit and its consumption may cause carcinogenic and non-carcinogenic diseases. As like Uranium, Fluoride has certain limit fixed by WHO that is 1.5 ppm. If the level of Fˉ is higher than 1.5 ppm it may cause dental fluorosis and skeletal fluorosis. To reduce the health risks due to intake of the elements or ions, the contaminated groundwater needs to be monitored and treated by means of constructing artificial recharge structures and other rainwater harvesting methods. However, certain ex-situ processes like membrane method, ion exchange, adsorption, and precipitation may be adopted to reduce or remove the contaminated elements/ions in the groundwater.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"270 ","pages":"Article 107665"},"PeriodicalIF":3.4,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164551","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":"Hydrochemical processes and water balance trends based on stable isotopes of typical alpine lakes in the Qinghai-Tibet Plateau","authors":"Changchang Fu ,&nbsp;Xiangquan Li ,&nbsp;Xu Cheng ,&nbsp;Cong Liu ,&nbsp;Zhanxue Bai ,&nbsp;Jinqiu Li","doi":"10.1016/j.gexplo.2024.107663","DOIUrl":"10.1016/j.gexplo.2024.107663","url":null,"abstract":"<div><div>Due to the warming climate, the hydrological cycle of the Qinghai-Tibet Plateau (QTP) is accelerating, leading to continuous growth of alpine lakes. In case of overflow, this can pose significant risks to downstream water quality and resources. However, there is a lack of comprehensive investigations on the chemical composition and water balance of lakes in QTP. This study examines the evolutionary mechanisms of alpine lakes in the Yanhu Lake Basin (YHB) located in central QTP. It investigates stable isotopes (<em>δ</em>¹⁸O and δD), hydrochemistry, and utilizes the isotope balance model to determine the evaporation to inflow (E/I) ratio of lake water. The findings reveal that lake water exhibits a Cl<img>Na hydrochemical type with enrichment in total dissolved solids (TDS), boron (B), and lithium (Li) elements. On the δD- <em>δ</em>¹⁸O plot, lake water falls below the Local Meteoric Water Line (LMWL) towards rightward direction with a slope of 4.75 and an intercept of 11.83, indicating pronounced evaporation characteristics. The presence of more positive isotope signals and ratios among major ions suggests that evaporation processes primarily govern lake water's hydrochemistry. The modeled E/I ratio ranges from 0.19 to 0.65 across YHB, implying a positive lake water balance which contributes to consistent expansion in surface area. This highlights the need for local government to enhance monitoring efforts, closely observe fluctuations in Yanhu Lake's water level, expedite implementation of lake water diversion projects, and conduct comprehensive assessment on their potential impact on local ecological environment.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"270 ","pages":"Article 107663"},"PeriodicalIF":3.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164548","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}