Mineralogical Changes in Acid Sulfate Soils With Thionic Horizons: Insights From the Delta Doce River, Brazil

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Francis Henrique Tenório Firmino, João Carlos Ker, Maurício Paulo Ferreira Fontes, Luiz Felipe Mesquita
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Abstract

Acid sulfate soils (ASS) with sulfide minerals (i.e., contain sulfidic materials) are widely distributed in both coastal and inland regions, and if exposed to air, the oxidation of sulfide minerals results in the production of sulfuric acid with the formation of thionic horizons (pH < 4) along with profound mineralogical changes. This study, conducted in the Delta of the Doce River, Espírito Santo, Brazil, investigated the mineralogical transformations of ASS with thionic horizons, focusing on the crystallinity of kaolinites under sulfurization conditions. Soil samples from six profiles with thionic horizons were analysed using X-ray diffraction (XRD), selective extractions and magnetic susceptibility measurements. Mineralogical analysis revealed the predominance of quartz, kaolinite, illite and gibbsite, along with secondary Fe(III) minerals such as jarosite, goethite and hematite, accompanied by a reduction in sulfide content, indicating the advanced stages of sulfide oxidation. In strongly sulfurized soils, an increase in kaolinite crystallinity was observed, suggesting that sulfurization intensifies the destruction of less crystalline phases in the soil. The formation of magnetic minerals was associated with burning processes, highlighting the role of anthropogenic interventions in the mineral transformation of these soils.

Abstract Image

含硫层酸性硫酸盐土壤的矿物学变化:来自巴西多塞河三角洲的见解
含硫化物矿物(即含硫化物物质)的酸性硫酸盐土壤(ASS)广泛分布于沿海和内陆地区,如果暴露于空气中,硫化物矿物氧化产生硫酸,形成硫离子层(pH < 4),并发生深刻的矿物学变化。本研究在巴西多塞河(Espírito Santo)三角洲进行,研究了硫化物层as的矿物学转变,重点研究了硫化条件下高岭石的结晶度。采用x射线衍射(XRD)、选择性萃取和磁化率测量等方法对6个含硫层的土壤样品进行了分析。矿物学分析显示,石英、高岭石、伊利石、三水铝石为主,黄钾铁矾、针铁矿、赤铁矿等次生铁(III)矿物伴生,硫化物含量减少,表明硫化物氧化阶段较晚。在强硫化土壤中,观察到高岭石结晶度的增加,表明硫化加剧了土壤中较少结晶相的破坏。磁性矿物的形成与燃烧过程有关,突出了人为干预在这些土壤矿物转化中的作用。
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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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