巴西东南部圣保罗州Cuesta和Paulista周边坳陷段红土硬壳形成的地球化学分析

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Everton Tiago Sulato , Karen Luko-Sulato , Daniel Godoy , Reiner Neumann , Vania Rosolen
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引用次数: 0

摘要

本研究旨在研究巴西Cuesta和Paulista外围凹陷红土风化剖面中的稀土元素(REE)、U、Th、Pb浓度和Pb同位素比值。样品分析提供了元素运移和分布的地球化学和矿物学指标,增强了对红土剖面风化过程和亲本遗传的认识。红土硬壳主要由针铁矿、赤铁矿、高岭石、石英和稀有磁铁矿组成,碱性阳离子损失明显,风化淋滤作用强烈。然而,风化锋面向强烈红土化的进展有限,可能受气候、地形、母岩成分和排水的控制。矿物学趋势根据海拔区分红土硬壳,赤铁矿在中高海拔(Cuesta)占主导地位,针铁矿在中低海拔(周边凹陷)占主导地位。稀土元素含量与矿物学的关系大于与母岩组成的关系,高海拔富赤铁矿红土硬壳中稀土元素含量较低,而高海拔富针铁矿红土硬壳中稀土元素含量较高,受富针铁矿红土硬壳蚀变阶段的影响。在红土硬壳、土壤和母质岩石中,轻稀土比重稀土富集,土壤表现出较大的流动性和差异富集。Pb在风化过程中发生再分配,红土硬壳保持中间同位素特征,土壤表现出最明显的放射性成因,而207Pb/206Pb和208Pb/206Pb比值表明各基质之间存在亲本遗传。高海拔红土硬壳在U和Pb或Th之间表现出反比关系,可能是由矿物学稳定、选择性吸附以及U和Th随时间的放射性衰变成Pb驱动的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geochemical analysis of lateritic duricrust formation in the Cuesta and Paulista Peripheral Depression sectors of São Paulo State, southeastern Brazil
This study aims to investigate rare earth elements (REE), U, Th, Pb concentrations, and Pb isotopic ratios in lateritic weathering profiles from the Cuesta and Paulista Peripheral Depression, Brazil. Sample analysis provided geochemical and mineralogical indicators of element mobilization and distribution, enhancing the understanding of weathering processes and parental inheritance in lateritic profiles. The lateritic duricrusts are composed of goethite, hematite, kaolinite, quartz, and rare magnetite, with a significant loss of basic cation, indicating intense weathering and leaching. However, weathering fronts show limited advancement toward intense laterization, likely controlled by climate, topography, parent rock composition, and drainage. A mineralogical trend distinguishes lateritic duricrusts by elevation, with hematite predominating at mid-to-high (Cuesta) and goethite predominating at low-to-mid (Peripheral Depression) elevations. REE concentrations correlate more with mineralogy than parent rock composition, with lower REE levels in hematite-rich lateritic duricrusts at higher elevations and higher REE content in goethite-rich ones from all elevations, influenced by the alteration stage of goethite-rich lateritic duricrusts. Light REE enrichment over heavy REE is observed in lateritic duricrusts, soils, and parent rock, with soils showing greater mobility and differential accumulation. Pb redistribution occurs during weathering, with lateritic duricrusts retaining intermediate isotopic signatures and soils exhibiting the most radiogenic Pb, while 207Pb/206Pb and 208Pb/206Pb ratios suggest parental inheritance among all matrices. Higher elevation lateritic duricrusts exhibit an inverse relationship between U and Pb or Th, likely driven by mineralogical stabilization, selective adsorption, and the radioactive decay of U and Th into Pb over time.
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来源期刊
Journal of South American Earth Sciences
Journal of South American Earth Sciences 地学-地球科学综合
CiteScore
3.70
自引率
22.20%
发文量
364
审稿时长
6-12 weeks
期刊介绍: Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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