Geochemistry-Exploration Environment Analysis最新文献_第8页

Near real-time management of spectral interferences with portable X-ray fluorescence spectrometers: application to Sc quantification in nickeliferous laterite ores 便携式x射线荧光光谱仪光谱干扰的近实时管理:在含镍红土矿石中钪定量中的应用

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-08-01 DOI: 10.1144/geochem2021-015

E. Lacroix, J. Cauzid, Y. Teitler, M. Cathelineau

{"title":"Near real-time management of spectral interferences with portable X-ray fluorescence spectrometers: application to Sc quantification in nickeliferous laterite ores","authors":"E. Lacroix, J. Cauzid, Y. Teitler, M. Cathelineau","doi":"10.1144/geochem2021-015","DOIUrl":"https://doi.org/10.1144/geochem2021-015","url":null,"abstract":"Since the development of portable X-ray fluorescence (pXRF) spectrometers, few studies have been conducted on the influence of spectral interferences between chemical elements. This study aims to improve the management of these interferences to obtain more reliable geochemical analyses. We specifically investigate Ca-related interferences on Sc analysis for the case of Ni-rich laterite samples using the Niton XL3t GOLDD + pXRF analyser. Three quantification methods were tested on 59 pelletized samples using the ‘Soil’ mode. The first, named ‘Manufacturer’, represents the elemental quantification directly provided by the device based on regions of interest and multilinear corrections of spectral interferences configured during the spectrometer design. The second, the ‘20 Cu’ method, is based on spectral fitting using the PyMCA software. The third, the ‘18 Fe’ method, combines spectral fitting with modified experimental conditions. For each, a quantification methodology was developed, establishing (i) Ca and Sc calibration lines and (ii) Ca/Sc threshold values delimiting fields of ‘reliable’, ‘to be confirmed’ and ‘unreliable’ measurements. The ‘20 Cu’ and ‘18 Fe’ methods greatly extend the ‘reliable measurements’ field concerning the Ca/Sc ratio compared to the ‘Manufacturer’ method. The ‘18 Fe’ method was also found to provide the most negligible measurement dispersion. Supplementary material: Figures A–F and Tables A and B are available at https://doi.org/10.6084/m9.figshare.c.5511838","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47928022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Sources of lanthanides in soils and estimation of their hazards 土壤中镧系元素的来源及其危害性评价

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-08-01 DOI: 10.1144/geochem2021-024

Y. Vodyanitskii, T. Minkina, T. Bauer

{"title":"Sources of lanthanides in soils and estimation of their hazards","authors":"Y. Vodyanitskii, T. Minkina, T. Bauer","doi":"10.1144/geochem2021-024","DOIUrl":"https://doi.org/10.1144/geochem2021-024","url":null,"abstract":"In recent years, an increase in the input of lanthanides (Ln), an important group of heavy metals (HMs), has been observed in the environment throughout the world (in particular soil). Anthropogenic Ln sources are mainly connected to phosphogypsum, Ln-bearing microfertilizer and micronutrients, and mine waste. Therefore, assessment of the hazards associated with the presence of Ln in the soil is an urgent issue. Hazardousness, depending strongly upon the buffer capacity of a specified soil, is determined by the organic matter content, the pH value and other soil properties. For a standard soil (containing 10% organic matter and 25% clay), the discrepancy of the hazardousness of HMs can be estimated based on the maximum permissible concentration (MPC) values proposed by ecologists in the Netherlands. Low levels of Ln contamination in the soil are found, making it possible to classify them in the group of moderately and weakly acting pollutants. The MPC value proposed for cerium (Ce) in the standard soil is 44 mg kg−1. Approximate MPC values for several other lanthanides (Ln, Pr, Nd, Sm, Gd and Dy) in soils were proposed based on MPC values for freshwater sediments in the Netherlands. According to the MPC value, Ln falls into the group of moderate- and low-hazardous heavy metals.","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41674882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Reactivation mechanisms and related-porosity enhancement of shear zones in the context of basement-hosted uranium mineralization: case of the Spitfire discovery in the Patterson Lake corridor, Canada 基底型铀矿化背景下剪切带的活化机制及相关孔隙度增强:以加拿大Patterson Lake走廊Spitfire油田发现为例

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-07-28 DOI: 10.1144/geochem2020-082

M. Abdelrazek, A. Benedicto, Olivier Gerbeaud, P. Ledru

{"title":"Reactivation mechanisms and related-porosity enhancement of shear zones in the context of basement-hosted uranium mineralization: case of the Spitfire discovery in the Patterson Lake corridor, Canada","authors":"M. Abdelrazek, A. Benedicto, Olivier Gerbeaud, P. Ledru","doi":"10.1144/geochem2020-082","DOIUrl":"https://doi.org/10.1144/geochem2020-082","url":null,"abstract":"Uranium mineralization in the Patterson Lake corridor (southwestern Churchill province, Canada) is hosted in the metamorphosed Paleoproterozoic basement covered to the north by the flat-lying sandstone formations of the Athabasca Basin. The mineralization is exclusively contained within inherited ductile structures that were reactivated under a brittle regime. Petrographic and micro-structural studies of drill core samples from the Spitfire discovery (Hook Lake project) reveal the linkages between structural evolution of the basement, alteration and mineralization. During basement exhumation, localization of non-coaxial deformation led to the formation of a large anastomosing shear zone system made of mylonitic rocks. Strain localization associated with fluid circulation induced strong mineralogical and rheological changes, forming discontinuities in mechanical anisotropy. During and post-deposition of the Athabasca Basin after 1.80 Ga, these zones of anisotropy localized brittle reactivation, expressed by a network of micro-fractures later amplified by dissolution processes which enhanced porosity later filled with phyllosilicates and uranium oxides. Cross-cutting relationships between alteration minerals and structures indicate that fluid circulation was active after the basement exhumation. Uranium-bearing fluids moved through the network of micro-fractures. As shown for the Spitfire prospect, fertile structures in the basement below the Athabasca Basin have a combined poly-phase structural and alteration history during which development of ductile shear zones followed by brittle reactivation and dissolution processes led to the formation of superimposed shear and damaged zones in which uranium orebodies are located. Thematic collection: This article is part of the Uranium Fluid Pathways collection available at: https://www.lyellcollection.org/cc/uranium-fluid-pathways","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45480651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Near real-time management of spectral interferences with portable XRF spectrometers: Application to Sc quantification in nickeliferous laterite ores 便携式XRF光谱仪光谱干扰的近实时管理:在含镍红土矿石中钪定量中的应用

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-07-23 DOI: 10.6084/M9.FIGSHARE.C.5511838.V1

E. Lacroix, J. Cauzid, Y. Teitler, M. Cathelineau

{"title":"Near real-time management of spectral interferences with portable XRF spectrometers: Application to Sc quantification in nickeliferous laterite ores","authors":"E. Lacroix, J. Cauzid, Y. Teitler, M. Cathelineau","doi":"10.6084/M9.FIGSHARE.C.5511838.V1","DOIUrl":"https://doi.org/10.6084/M9.FIGSHARE.C.5511838.V1","url":null,"abstract":"Since the development of portable XRF (pXRF) spectrometers, few studies have been conducted on the influence of spectral interferences between chemical elements. This study aims to improve the management of these interferences to obtain more reliable geochemical analyses. We specifically investigate Ca-related interferences on Sc analysis for the case of Ni-rich laterite samples using the Niton XL3t GOLDD+ pXRF analyser. Three quantification methods were tested on 59 pelletised samples using the ‘Soil’ mode. The first named ‘Manufacturer’, represents the elemental quantification directly provided by the device based on Regions of Interest (ROI) and multilinear corrections of spectral interferences configured during the spectrometer design. The second, the ‘20 Cu’ method, is based on spectral fitting using the PyMCA software. The third, the ‘18 Fe’ method, combines spectral fitting with modified experimental conditions. For each, a quantification methodology was developed, establishing (i) Ca and Sc calibration lines and (ii) Ca/Sc threshold values delimiting fields of ‘reliable’, 'to be confirmed,’ and ‘unreliable’ measurements. The ‘20 Cu’ and ‘18 Fe’ methods greatly extend the ‘reliable measurements’ field concerning the Ca/Sc ratio compared to the ‘Manufacturer’ method. The ‘18 Fe’ method was also found to provide the most negligible measurement dispersion.","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":"15 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91290872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogeochemical characteristics and geothermometry of hot springs in the Altai region, Mongolia 内蒙古阿尔泰地区温泉水文地球化学特征及地热测量

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-07-14 DOI: 10.1144/geochem2021-016

Bolormaa Chimeddorj, D. Munkhbat, B. Altanbaatar, Oyuntsetseg Dolgorjav, B. Oyuntsetseg

{"title":"Hydrogeochemical characteristics and geothermometry of hot springs in the Altai region, Mongolia","authors":"Bolormaa Chimeddorj, D. Munkhbat, B. Altanbaatar, Oyuntsetseg Dolgorjav, B. Oyuntsetseg","doi":"10.1144/geochem2021-016","DOIUrl":"https://doi.org/10.1144/geochem2021-016","url":null,"abstract":"This study determines the properties of hot spring waters and associated rocks, calculates reservoir temperatures and depths in the Mongolian Altai region, and constructs a conceptual model for geothermal water based on these results. The hot springs consist of HCO3–Na, SO4–Na, and HCO3–SO4–Na mixed waters. They exhibit alkaline pH levels and temperatures in the range 21.3–35°C. X-ray diffraction analyses of outcrop rocks reveal silicate and carbonate-type minerals such as quartz, albite, orthoclase, dolomite, mica and actinolite, while correlation analysis indicates that the chemical composition of the hot spring water is directly related to rock mineral composition, where dissolution of albite, orthoclase and dolomite minerals has played an important role. Reservoir water circulation depths are 2615–3410 m according to quartz and chalcedony geothermometry. The results indicate that the spring water in the Mongolian Altai region comprises a low mineral content with alkaline pH levels and that the reservoir temperature can reach up to 106°C. We also propose a conceptual model for geothermal water in the Chikhertei hot spring. The geothermal water in the Mongolian Altai region has the potential for use in heating systems. Thematic collection: This article is part of the Hydrochemistry related to exploration and environmental issues collection available at: https://www.lyellcollection.org/cc/hydrochemistry-related-to-exploration-and-environmental-issues","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47465565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Petrology of Precambrian metagranites and heavy mineral chemistry of the Olounou area within the Cameroon mineral belt (Ntem complex, South Cameroon): relationships with the Fe mineralization 喀麦隆矿带(南喀麦隆Ntem杂岩)内前寒武纪变质岩的岩石学与重矿物化学:与铁成矿的关系

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-06-21 DOI: 10.1144/geochem2021-006

Mboudou Germain Marie Monespérance, Owona Sébastien, Ndema Mbongué Jean Lavenir, Agyingi Christopher Mbaringong, Balla Ateba Moise Christian, Emmanuel Eseya Mengu Junior

{"title":"Petrology of Precambrian metagranites and heavy mineral chemistry of the Olounou area within the Cameroon mineral belt (Ntem complex, South Cameroon): relationships with the Fe mineralization","authors":"Mboudou Germain Marie Monespérance, Owona Sébastien, Ndema Mbongué Jean Lavenir, Agyingi Christopher Mbaringong, Balla Ateba Moise Christian, Emmanuel Eseya Mengu Junior","doi":"10.1144/geochem2021-006","DOIUrl":"https://doi.org/10.1144/geochem2021-006","url":null,"abstract":"The petrology of Achaean biotite- and amphibole-rich metagranites, the geochemistry of Fe occurrences and heavy mineral concentrations in stream sediments from Olounou (Ntem complex) help to constrain their inter-relationships. These metagranites display granoblastic textures outlined by microcline, biotite, amphibole and oxides. Ilmenite (60 to 80%), zircon (15 to 20%) and rutile (1 to 2%) are the mineral fractions in pan concentrates. Two types of Fe mineralization as silicified veins cross-cut the above rocks: hematite ± magnetite quartzites with primary hematite enclosing magnetite relicts contain high average Fe2O3 (69.05 wt%) and TiO2 (0.73 wt%); banded magnetite-rich quartzites with magnetite partially replaced by hematite are characterized by Fe2O3 (52.15 wt%), TiO2 (0.27 wt%), relatively high W (286 ppm) and Ni (108 ppm). Both types have Zn, Cu, Ga contents below 10 ppm, positive Eu anomalies, HREE enrichment over LREEs and low ΣREE (9.76 to 12.07). Iron and SiO2 were derived from weathering of Archean biotite and amphibole metagranites, deposited in existing Post-Archean intracratonic basins under greenschist facies and impacted by submarine hydrothermal solutions. These results are genetically comparable to other Precambrian BIFs and underline the iron potential of Olounou. They equally contribute to iron ore exploration in Cameroon and worldwide. Supplementary material: Table S1 is available at https://doi.org/10.6084/m9.figshare.c.5426547","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":"21 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41648391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of the C-N fractal model, factor analysis and geochemical mineralization probability index (GMPI) for delineating geochemical anomalies related to a Mn-Fe deposit and associated Cu mineralization in west-central Sinai, Egypt 应用C-N分形模型、因子分析和地球化学成矿概率指数(GMPI)圈定了埃及西奈中西部某锰铁矿床及其伴生铜矿化地球化学异常

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-06-17 DOI: 10.1144/geochem2021-031

H. Helba, A. M. El-Makky, K. Khalil

{"title":"Application of the C-N fractal model, factor analysis and geochemical mineralization probability index (GMPI) for delineating geochemical anomalies related to a Mn-Fe deposit and associated Cu mineralization in west-central Sinai, Egypt","authors":"H. Helba, A. M. El-Makky, K. Khalil","doi":"10.1144/geochem2021-031","DOIUrl":"https://doi.org/10.1144/geochem2021-031","url":null,"abstract":"The west-central Sinai area includes one of the most productive manganese deposits in Egypt (Um Bogma Mn-Fe ore). The explored area is covered by a Carboniferous and Cambro-Ordovician sedimentary succession overlying Precambrian basement rocks. The purpose of this study is to delineate geochemical anomalies of ore and related elements and track their dispersion trains, which may lead to the discovery of unknown ore deposits. For this purpose, 143 stream sediment samples were analysed and the data were interpreted using the concentration–number (C-N) fractal model, factor analysis and the geochemical mineralization probability index (GMPI). Geochemical thresholds obtained from the C-N fractal model, factor scores and GMPI were used for constructing geochemical anomaly maps and delineating probable anomalous sites. The spatial distribution of Mn, Cu, Co, Pb and Zn anomalies was correlated to Mn and Cu mineralization sites whereas those of Fe and Cr were consistent with mafic rock distributions. Factor analysis revealed significant element associations for mineralization (Cu, Co, Mn, Zn, Pb), country rock composition (Fe, Cr) and element mobility (Cd, Zn). The spatial distribution of ore elements (Mn, Cu) delineated by the factor score and GMPI distribution maps was confirmed and more accurately interpreted using geochemical anomaly maps constructed based on the fractal-derived thresholds. Based on the current study, recent Cu and Mn mineralization sites may be suggested. Cobalt, Zn, Pb and Cd are suggested as efficient pathfinder elements for marine Mn deposits. A dispersion sequence of Cd>Mn>Co>Pb>Zn>Cu>Cr>Fe was proposed based on the threshold distribution patterns of these elements. Supplementary material: Tables S1–S3 and Figures S1 and S2 are available at https://doi.org/10.6084/m9.figshare.c.5463511","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48136319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Efficiency of acid digestion procedures for geochemical analysis of tungsten mining wastes 酸消化法对钨矿废物地球化学分析的效率研究

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-06-03 DOI: 10.1144/geochem2021-034

Zheng Han, M. Edraki, A. Nguyen, Marietjie Mostert

{"title":"Efficiency of acid digestion procedures for geochemical analysis of tungsten mining wastes","authors":"Zheng Han, M. Edraki, A. Nguyen, Marietjie Mostert","doi":"10.1144/geochem2021-034","DOIUrl":"https://doi.org/10.1144/geochem2021-034","url":null,"abstract":"There is an increasing global demand for tungsten, which is a critical element used in various industries. There are millions of tons of current and legacy mineral processing tungsten tailings worldwide that can potentially contaminate the environment and pose human health risks. These tailings could also become valuable resources if we thoroughly characterize their geochemical composition. In this study, an innovative method was developed to achieve the complete digestion of tungsten tailings. We tested three different digestion methods (hotplate digestion, bomb digestion and ColdBlockTM digestion) and compared the results. Additionally, an alkali fusion for major element analysis was applied and tested. The results showed that alkali fusion is the best method for major element analysis, while bomb digestion is best for tungsten and trace element analysis, although volatile chlorite loss was also observed. The hot plate digestion method was not recommended, owing to poor recovery of trace elements compared to the bomb digestion method. The quicker and safer ColdBlockTM digestion method can be used for bismuth, molybdenum, and several rare-earth element analyses, as indicated by their recovery being close to that from the bomb digestion method.","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47046188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Using an analytic hierarchy process-based index and geographic information system in geochemical exploration of gold 利用层次分析法和地理信息系统在金矿化探中的应用

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-06-03 DOI: 10.1144/geochem2021-013

Erkan Yılmazer, M. Kavurmacı, Sercan Bozan

{"title":"Using an analytic hierarchy process-based index and geographic information system in geochemical exploration of gold","authors":"Erkan Yılmazer, M. Kavurmacı, Sercan Bozan","doi":"10.1144/geochem2021-013","DOIUrl":"https://doi.org/10.1144/geochem2021-013","url":null,"abstract":"In this study, a gold exploration index (GEI) that reduces financial expenditure and time losses during exploration studies has been developed using the analytical hierarchy process in a region where a high-sulfidation epithermal gold (Au) deposit exists. The GEI can be used to predict the location of the target element by evaluating the maps obtained from related element distributions together with a GEI-based prediction map. The hierarchical structure of the index has been established based on geochemistry of the rock samples. The elements used in the design of the hierarchical structure are arsenic (As), silver (Ag), antimony (Sb), copper (Cu), manganese (Mn), lead (Pb) and zinc (Zn), which are determined by the correlation analysis and experts’ opinions. The efficiency scores of the alternatives are converted into prediction maps called GEI-based anomaly distribution maps. These are compared with the maps derived from both geographic information system-based overlay analysis of the rock samples and spatial gold distribution. The efficiency scores of the alternatives in these maps are categorized into three groups as ‘high’, ‘medium’ and ‘weak’ in terms of gold potential. Comparison of the results with those derived using principal component analysis, weighted sum and weighted product models shows that the produced index yields reliable information that can be used to determine where gold enrichment occurs, especially in high-sulfidation epithermal environments. Supplementary material: Geochemical analysis results are available at https://doi.org/10.6084/m9.figshare.c.5443218","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44752656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of freeze–thaw cycles on soil physicochemical properties and fractions of Pb and Cr in the northeastern Qinghai–Tibet Plateau 青藏高原东北部冻融循环对土壤理化性质及Pb、Cr含量的影响

IF 2.4 4区地球科学

Geochemistry-Exploration Environment Analysis Pub Date : 2021-06-03 DOI: 10.1144/geochem2021-029

Leiming Li, Jun Wu, Jian Lu, Xiuyun Min

{"title":"Effect of freeze–thaw cycles on soil physicochemical properties and fractions of Pb and Cr in the northeastern Qinghai–Tibet Plateau","authors":"Leiming Li, Jun Wu, Jian Lu, Xiuyun Min","doi":"10.1144/geochem2021-029","DOIUrl":"https://doi.org/10.1144/geochem2021-029","url":null,"abstract":"Simulation experiments were conducted using soils in the northeastern Qinghai–Tibet Plateau to explore the effects of freeze–thaw cycles on soil physicochemical properties, Pb and Cr distribution, and fraction transformation. Soils were incubated at −15°C for 24 h and at 5°C for 24 h to complete a freeze–thaw cycle. The soil physicochemical properties and fractions of Pb and Cr were analyzed after serial freeze–thaw treatments. The results showed that different freeze–thaw cycles and water content affected soil physicochemical properties and fractions of Pb and Cr to some extent. The cation exchange capacity increased significantly in agricultural and pastoral soils after five freeze–thaw cycles. The sand proportion of soil in an urban area decreased at 60 cycles. Freeze–thaw cycles did not change the functional groups and mineral constituents of the soils. The infrared peaks of soils with different freeze–thaw conditions were very similar. The freeze–thaw treatment influenced the mobility, chemical fractions of Pb and ecological risk in most of the soils. The exchangeable Pb in agricultural and pastoral areas increased from 0.19 to 1.52/0.90% after 5/10 freeze–thaw cycles with 60% water content. The ecological values of Pb in urban soil were 8.32/7.38% higher at 10/15 freeze–thaw cycles compared with the control treatment. Hence, these findings provide useful information on physicochemical properties and fraction transformation of Pb and Cr in soils undergoing freeze–thaw cycles, and offer an additional insight on Pb and Cr behaviors in cold and freezing environments. Thematic collection: This article is part of the Hydrochemistry related to exploration and environmental issues collection available at: https://www.lyellcollection.org/cc/hydrochemistry-related-to-exploration-and-environmental-issues","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44183222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1