Integrating principal component analysis and U-statistics for mapping polluted areas in mining districts

Seyedrahimi-Niaraq, Mirmahdi; Mahdiyanfar, Hossein; Mokhtari, Ali

doi:10.1016/j.gexplo.2021.106924

Cited by 5 publications

(2 citation statements)

References 61 publications

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“…Principal component analysis aims to transform multiple indicators into a few composite indicators (i.e., principal components) using the idea of dimensionality reduction, and each principal component is used to analyze and interpret the information contained in the original data indicators [8,9,29,30]. In order to identify the sources of major elements in geothermal fluids, the eight indicators of Ca 2+ , Mg 2+ , Na + , K + , Cl − , SO 4 2− , HCO 3 − , and H 2 SiO 3 of eight geothermal water samples were subjected to principal component analysis in this study.…”

Section: Ion Source Analysis 421 Principal Component Analysismentioning

confidence: 99%

Geochemical Investigations of the Geothermal Waters in the Kangding Area, SW China: Constraints from Hydrochemistry and D-O-T Isotopy

Zhang,

Deng,

Feng

et al. 2023

Water

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Geothermal resources, as a representative of clean energy, has been paid significant attention in the world. Due to active neotectonics and widespread magmatic rocks, the abundant geothermal waters in the Kangding area have been investigated. Hydrochemistry and D–O–T isotopy studies were carried out to clarify the genetic mechanism of geothermal waters. The hydrochemical types of geothermal waters are mainly Ca2+–Na+–HCO3− type, Na+–Cl−–HCO3− type, and Na+–HCO3− type. Silicate dissolution and the cation exchange process are the water–rock interactions determining hydrochemical compositions. The recharge elevation of geothermal water was calculated to be 3034–3845 m, with an average of 3416 m. The reservoir temperatures of shallow and deep geothermal reservoirs vary from 50 to 115 °C and from 114 to 219 °C, respectively, and the mixing ratio of cold water is 0.56–0.89. These findings help to reveal the genetic mechanism of geothermal waters in the Kangding area.

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Section: Ion Source Analysis 421 Principal Component Analysismentioning

confidence: 99%

Geochemical Investigations of the Geothermal Waters in the Kangding Area, SW China: Constraints from Hydrochemistry and D-O-T Isotopy

Zhang,

Deng,

Feng

et al. 2023

Water

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show abstract

“…Each principal component is extracted to explain the information of the raw data variables. The principal component contribution scores can explain the geospatial distribution and temporal variation characteristics of the raw hydrochemical data [25][26][27].…”

Section: Principal Component Analysismentioning

confidence: 99%

Coupling Hydrochemistry and Stable Isotopes (δ2H, δ18O and 87Sr/86Sr) to Identify the Major Factors Affecting the Hydrochemical Process of Groundwater and Surface Water in the Lower Reaches of the Yarlung-Zangbo River, Southern Tibet, Southwestern China

Xiao

Yuan

Guo

et al. 2022

Water

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In Tibet, water resource has been less studied due to remote and harsh conditions. In this study, hydrochemistry and stable isotopes (δ2H, δ18O and 87Sr/86Sr) were employed to investigate the major factors affecting the hydrochemical process of groundwater and surface water in the lower reaches of the Yarlung-Zangbo River, southern Tibet. Groundwater and surface water were weakly alkaline and very soft to moderately hard water. The hydrochemical type of surface water is mainly Ca-HCO3 (mainstream) and Ca-SO4-HCO3 (tributary), while the hydrochemical type of groundwater was mainly Ca-SO4-HCO3. Multivariate statistical analysis and Gibbs analysis proposed hydrochemical components were dominated by water-rock interaction. Ion ratio, saturation index, and Sr isotope revealed calcite dissolution and silicate weathering with local sulfide oxidation were involved in water–rock interaction. D-O isotopes indicated the recharge source was mainly derived from atmosphere precipitation. The entropy-weighted water quality index indicated surface water and groundwater reach the standard of drinking purpose in the lower reaches of the Yarlung-Zangbo River. The hydrochemical type varied regularly along the Yarlung-Zangbo River. The dissolution of carbonate rocks and local silicate weather and evaporate dissolution are the primary hydrochemical process along the Yarlung-Zangbo River. This study would provide a preliminary insight for hydrochemical process in the Yarlung-Zangbo River.

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Application of U-spatial statistics for separating magnetic anomalies: a case study on the Galali iron ore deposit in western Iran

Seyedrahimi-Niaraq

Shahsavani²,

Hekmatnejad³

2022

Arab J Geosci

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Integrating principal component analysis and U-statistics for mapping polluted areas in mining districts

Cited by 5 publications

References 61 publications

Geochemical Investigations of the Geothermal Waters in the Kangding Area, SW China: Constraints from Hydrochemistry and D-O-T Isotopy

Geochemical Investigations of the Geothermal Waters in the Kangding Area, SW China: Constraints from Hydrochemistry and D-O-T Isotopy

Coupling Hydrochemistry and Stable Isotopes (δ2H, δ18O and 87Sr/86Sr) to Identify the Major Factors Affecting the Hydrochemical Process of Groundwater and Surface Water in the Lower Reaches of the Yarlung-Zangbo River, Southern Tibet, Southwestern China

Application of U-spatial statistics for separating magnetic anomalies: a case study on the Galali iron ore deposit in western Iran

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