巴西东北部角闪岩形成的luvisol的层间相粘土矿物形成

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-09-17 DOI:10.1016/j.clay.2025.107995

Artur Henrique Nascimento da Silva , Gabriel Ramatis Pugliese Andrade , Sheila Aparecida Correia Furquim , Fábio Soares de Oliveira , Marilya Gabryella de Sousa , Marcelo Metri Correa , Ygor Jacques Agra Bezerra da Silva , Juliet Emília Santos de Sousa , Tiago Osório Ferreira , Xose Lois Otero , Valdomiro Souza Junior

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引用次数: 0

摘要

研究了巴西东北部半干旱气候条件下角闪岩上形成的luvisol中粘土矿物的转化，以了解风化强度如何驱动混合层矿物（MLMs）的发育并影响关键的土壤性质。从相似的角闪岩母物质中发育而来的两个铬色luvisol分别代表不同的气候条件（剖面1：年降水量= 415 mm yr - 1；剖面2:= 777 mm yr - 1）在A、B和Cr层上取样。利用x射线衍射、傅里叶变换红外光谱、热重和Mössbauer光谱对粘土组分及其层间矿物进行了表征。结果表明，两种土壤均以层间高岭石-蒙脱石（KS）相为主，剖面1中可膨胀蒙脱石层的比例较高。剖面2各深度高岭石层富集程度较高。值得注意的是，本研究表明，来自巴西半干旱地区的天然luvisol中的成土粘土矿物由过渡性mlm组成，而不是离散的端元。气候变化对土壤矿物学成分的影响主要是通过混合层相的变化。

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Clay mineral formation via interstratified phases in Luvisols formed from amphibolite, northeastern Brazil

The transformations of clay minerals in Luvisols formed on amphibolite under contrasting semi-arid climates in northeastern Brazil were examined to understand how weathering intensity drives the development of mixed-layer minerals (MLMs) and affects key soil properties. Two Chromic Luvisols, developed from similar amphibolite parent material, each representing distinct climatic conditions (Profile 1: annual precipitation = 415 mm yr⁻¹; Profile 2: = 777 mm yr⁻¹) were sampled across their A, B, and Cr horizons. X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetry and Mössbauer spectroscopy were used to characterize the clay fractions and their interstratified minerals. The results revealed that both soils predominantly feature interstratified kaolinite–smectite (KS) phases, with Profile 1 showing higher proportions of expandable smectite layers. In contrast, Profile 2 exhibited a greater enrichment in kaolinitic layers at all depths. Notably, this study demonstrates that the pedogenetic clay minerals in natural Luvisols from the Brazilian semiarid region consist of transitional MLMs rather than discrete endmembers. It also shows that climatic variation influenced the soil mineralogical composition, primarily through changes in the mixed-layer phases.

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...