Geophysical characterization of a sand deposit in a small-scale mining in the central east region of São Paulo State, Brazil

IF 2.1 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2025-10-13 DOI:10.1016/j.jappgeo.2025.105986

Jorge Luís Porsani , Victor Hugo Hott Costa , Nathália de Souza Penna , Rodrigo Corrêa Rangel , Marcelo Cesar Stangari , Gustavo Isnard Jarussi , Gabriel Alencar Silva Almeida Dantas , Rafael Josimar Araos Huaman

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引用次数: 0

Abstract

This research employs Electrical Resistivity Tomography (ERT), Ground-Penetrating Radar (GPR), and Transient Electromagnetic (TEM) to characterize a sand deposit located in a small-scale mining (SSM) in Leme, São Paulo State, Brazil. The region has a high demand for sand, particularly in the construction industry. The applied geophysical methods provide complementary information. ERT and GPR data enable the investigation of shallow subsurface layers (up to ∼30 m), whereas TEM is employed to investigate deeper structures, reaching depths of up to ∼350 m. The integrated geophysical results allowed the identification of a geoelectrical stratigraphy down to a few hundred meters, characterizing both unsaturated and saturated sand layers. A 3D model of the sand deposit was built based on the geophysical results and lithological information from boreholes in the study region. This model includes the deposit's geometry, mass, and volume, which are crucial information for an economic assessment of the SSM. Moreover, our results demonstrate how near-surface geophysical methods can be employed to help with a sustainable exploration of a sand deposit in an SSM.

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在巴西圣保罗州中部东部地区的一个小规模采矿砂矿床的地球物理特征

本研究采用电阻率断层扫描（ERT）、探地雷达（GPR）和瞬变电磁（TEM）技术，对巴西圣保罗州Leme的一个小型矿山（SSM）中的砂矿进行了表征。该地区对沙子的需求量很大，特别是在建筑行业。应用地球物理方法提供了补充信息。ERT和GPR数据可以调查浅层次表层（高达~ 30 m），而TEM用于调查更深的结构，可达到~ 350 m的深度。综合地球物理结果可以识别几百米深的地电地层学，表征非饱和和饱和砂层。根据研究区钻孔的地球物理结果和岩性信息，建立了砂体三维模型。该模型包括矿床的几何形状、质量和体积，这些都是对SSM进行经济评估的关键信息。此外，我们的研究结果表明，近地表地球物理方法可以用来帮助在SSM砂沉积的可持续勘探。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Geophysics 地学-地球科学综合

CiteScore

3.60

自引率

10.00%

发文量

274

审稿时长

4 months

期刊介绍： The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.