Variations in the magnetic properties of quaternary sediments from various physiographic regions along the bank of Matla River, Sundarban, West Bengal, India

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-08-18 DOI:10.1007/s12665-025-12496-7

Swagata Das, M. Venkateshwarlu, Supriya Mondal, Ashis Kr. Das, Debesh Gain, Solanky Das

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引用次数: 0

Abstract

Magnetic susceptibility measurements at low and high frequencies (χ_lf, χ_hf) and rock magnetic experiments (i.e., Curie curve analysis, Isothermal Remanent Magnetization, Hysteresis) are carried out on quaternary mangrove sediments from the bank of Matla River, Sundarban, West Bengal, India. Magnetic investigations being simple, fast, cost-effective, and non-destructive, are utilized to gather extensive data as a proxy for the spatial distribution of pollution. The study emphasizes magnetic parameters, such as concentration-dependent factors (magnetic susceptibility, isothermal remanent magnetization) and feature-dependent factors (coercivity of remanence, magnetic susceptibility ratio), as indicators of pollution. This study aims to investigate the application of magnetic parameters to determine magnetic property enhancement within the mangrove sediments along Matla River and thereby evaluate anthropogenic activities. The analysis of variations of χ_lf and frequency-dependent susceptibilities (χ_fd and χ_fd%) indicate that the superparamagnetic (SP) grains dominate in the soil samples which mainly supports the magnetic susceptibility enhancement with few exceptions. The thermomagnetic curve identifies Curie temperature of the magnetic minerals and tracks magnetic carrier transformations during heating and cooling, showing both reversible and irreversible magnetization-temperature (J-T) behaviours. The Isothermal Remanent Magnetization (IRM) curve saturates at ~ 300 mT, characteristic of ferrimagnetic minerals like magnetite or maghemite, while some samples remain unsaturated at ~ 800 mT, suggesting high coercivity minerals like haematite or iron sulfides. Moving downstream, increasing coercivity indicates higher concentrations of these minerals. Hysteresis parameters (M_rs/M_s vs. B_cr/B_c) on a Day plot show samples within the Pseudo Single Domain (PSD) range, likely a mix of Single Domain (SD) and Multi Domain (MD) grains.

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印度西孟加拉邦孙德班马特拉河沿岸不同地理区域第四纪沉积物磁性的变化

对印度西孟加拉邦Sundarban Matla河沿岸第四纪红树林沉积物进行了低、高频磁化率测量（χlf, χhf）和岩石磁性实验（居里曲线分析、等温剩磁、磁滞）。磁法调查具有简单、快速、经济、非破坏性等优点，可用于收集大量数据，作为污染空间分布的代表。该研究强调磁性参数作为污染的指标，如浓度相关因素（磁化率、等温剩余磁化率）和特征相关因素（剩磁矫顽力、磁化率比）。本研究旨在探讨磁参数在马特拉河沿岸红树林沉积物中磁性增强的应用，从而评估人类活动。χf和频率相关磁化率的变化分析（χfd和χfd%）表明，超顺磁性（SP）颗粒在土壤样品中占主导地位，这主要支持磁化率的增强，少数例外。热磁曲线识别了磁性矿物的居里温度，并跟踪了加热和冷却过程中磁性载流子的转变，表现出可逆和不可逆的磁化温度（J-T）行为。等温剩余磁化（IRM）曲线在~ 300 mT时达到饱和，这是铁磁性矿物如磁铁矿或磁铁矿的特征，而一些样品在~ 800 mT时仍保持不饱和，可能是高矫顽力矿物如赤铁矿或硫化铁。向下游移动，矫顽力的增加表明这些矿物的浓度更高。日图上的滞后参数（Mrs/Ms vs. Bcr/Bc）显示了伪单畴（PSD）范围内的样本，可能是单畴（SD）和多畴（MD）颗粒的混合。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.