Marco Antônio Couto

Serviço Geológico do Brasil - CPRM

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Jorge Luís Porsani

Sociedade Brasileira de Geofísica

Cassiano Antônio Bortolozo

Centro Nacional de Monitoramento e Alertas de Desastres Naturais

Gianluca Fiandaca

University of Milan

Esben Auken

Oak Ridge National Laboratory

David Nakamura Leite

Universidade de São Paulo

Fernando A. Monteiro Santos

University of Lisbon

Anders Vest Christiansen

Aarhus University

Julian David Realpe Campaña

Departamento de Ciência e Tecnologia

Emerson Rodrigo Almeida

Universidade Federal de Uberlândia

Pradip Kumar Maurya

Aarhus University

Cooperative Institutions

Universidade de São Paulo

Instituto de Geofísica y Astronomía

Universidade Estadual Paulista (Unesp)

Centro Nacional de Monitoramento e Alertas de Desastres Naturais

Hospital Universitário da Universidade de São Paulo

Serviço Geológico do Brasil - CPRM

Sociedade Brasileira de Geofísica

Universidade Federal de Minas Gerais

Instituto de Geociencias

Instituto Geológico

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The Effects of Negative Values of Apparent Resistivity in TEM Surveys

International Journal of Geosciences (2016)

Cassiano Antônio Bortolozo Julian David Realpe Campaña Marco Antônio Couto Jorge Luís Porsani Fernando A. Monteiro Santos

The calculation of apparent resistivity in electrical methods is relatively simple and consolidated in the literature. Furthermore, in the case of DC methods, the apparent resistivity values are for the most part, intuitive and enable an initial interpretation of the results. On the other hand, in TEM method the apparent resistivity values are not very intuitive and interpretation based only on the apparent resistivity values cannot be done reasonably. In this way, this paper presents a discussion about the reasons and effects of the negatives values of apparent resistivity in TEM soundings. The main objective of this paper is to clarify the meanings of these negatives values and the possible effects in TEM inversion.

10.4236/ijg.2016.710088

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Citations (7)

Geoelectrical characterization with 1D VES/TDEM joint inversion in Urupês-SP region, Paraná Basin: Applications to hydrogeology

Journal of Applied Geophysics (2018)

David Nakamura Leite Cassiano Antônio Bortolozo Jorge Luís Porsani Marco Antônio Couto Julian David Realpe Campaña

Vertical electrical sounding

10.1016/j.jappgeo.2018.02.022

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Citations (13)

VTEM and Aeromagnetic Data Modeling Applied to Cu, Zn and Pb Prospection in Palmeirópolis Project, TO, Brazil

Marco Antônio Couto Ricardo Wosniak Eduardo Duarte Marques Tiago Rocha Faria Duque Marco Túlio Naves de Carvalho

This paper presents the results of forward sheet modeling for conductors bodies and Magnetization Vector Inversion (MVI) technique applied for an airborne geophysical survey located over Palmeirópolis region, TO State, Brazil. The airborne geophysical survey was provided by Votorantim Metais and Lara do Brasil LTDA. It is composed by Versatile Transient Electromagnetic (VTEM) and aeromagnetometric data. The region is characterized by Cu, Zn and Pb mineralization associated with Volcanic Hosted Massive Sulfide (VHMS) environment. The modeling was focused in four known ore bodies (C1, C2, C3 and C4) and presents significant results associated with the mineralizationm, its structural control and spatial extension. Also, to minimize the inherent ambiguities of each method, a Spectral Induced Polarization (SIP) and geochemical follow-up and regional CPRM surveys were integrated to the results.

Prospection

10.1190/sbgf2017-104

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Citations (1)

AEMIP robust inversion using maximum phase angle Cole–Cole model re-parameterisation applied for HTEM survey over Lamego gold mine, Quadrilátero Ferrífero, MG, Brazil

Exploration Geophysics (2019)

Marco Antônio Couto Gianluca Fiandaca Pradip Kumar Maurya Anders Vest Christiansen Jorge Luís Porsani

This paper presents the results of airborne electromagnetic induced polarisation inversions using the Maximum Phase Angle (MPA) model for a helicopter time domain survey in the Quadrilátero Ferrífero area, Minas Gerais State (MG), Brazil. The inversions were conducted using a laterally constrained robust scheme, in order to decrease the difficulties to recover the multi-parametric model in a very ill-posed inverse problem, often found in induced polarisation studies. A set of six flight lines over the Lamego gold mine mineralised structure were inverted using the MPA re-parameterisation of the Cole–Cole model and also the classical resistivity-only parameterisation, in order to understand the implications of the induced polarisation effect in the data and, consequently, in the resistivity model. A synthetic study was also conducted, seeking to understand what to expect from the resistivity-only inversions in the real data. According to borehole lithological data and previous structural knowledge from the literature, the results from the Maximum Phase Angle approach indicate an important chargeable body that seems to be in good agreement with a sulfide enriched carbonaceous/graphite and altered mafic unities, which are important markers for the gold mineralisation.

10.1080/08123985.2019.1682458

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Citations (12)

Investigação de Depósitos Auríferos no Quadrilátero Ferrífero, MG, Por Meio da Análise de Dados HTEM

Marco Antônio Couto

I would like to strongly thank my co-advisor, Esben Auken

10.11606/t.14.2021.tde-10082021-111900

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A discussion of 2D induced polarization effects in airborne electromagnetic and inversion with a robust 1D laterally constrained inversion scheme

Geophysics (2018)

Changhong Lin Gianluca Fiandaca Esben Auken Marco Antônio Couto Anders Vest Christiansen

Recently, the interest in the induced polarization (IP) phenomenon in airborne time-domain electromagnetic (ATEM) data has increased considerably. IP may affect the ATEM data significantly and mask underlying geologic structures. To simulate 2D airborne IP data, a 2D finite-element forward-modeling algorithm has been developed with the dispersive conductivity described by the well-known Cole-Cole model. We verify our algorithm by comparison with the 1D solution of the AarhusInv code. Two-dimensional forward responses on six synthetic models, mimicking archetypal 2D conductive and chargeable anomalies, have been generated, and the results indicate that 2D IP affects the data significantly. Differences between the 2D IP responses and the 1D IP responses are evident above the 2D anomalies and at their edges. These differences are similar to what is found when comparing 2D and 1D forward responses over conductive 2D anomalies without considering IP. We evaluate an effective robust inversion scheme to recover the 2D IP parameters using the 1D laterally constrained inversion (LCI) scheme. The inversion of the synthetic data using the robust scheme indicates that not only can the IP parameters be recovered, but also the IP inversions can provide more accurate resistivity sections than a resistivity-only inversion, in terms of resistivity values and anomaly thickness/depth. The field example from Hope Bay area in Canada is even more valuable, considering that part of the profile consists of only negative data, which cannot be inverted with a resistivity-only scheme. Furthermore, the edge effects at the anomaly boundaries are less pronounced in the IP parameters than in the resistivity parameter on the synthetic models with more conductive backgrounds.

Induced polarization

Synthetic data

10.1190/geo2018-0102.1

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Citations (25)

Inversion of Electromagnetic and Magnetic Data and Self-Organizing Maps applied to Palmeirópolis Project

Telma Aisengart D. A. B. Barbosa Geoffrey Plastow Marco Antônio Couto

In this paper we took advantage of cloud computing power, modelling techniques like VOXI inversion and machine learning (Self Organizing Maps) to map and model regional structures, local anomalies some already known (C1, C2, C3 AND C4) and also propose new targets to explore in Palmeirópolis area which is located in the state of Tocantins, Brazil.The airborne Geophysical survey was provided by Votorantim Metais and Lara do Brasil LTDA and it is composed by Versatile Transient Electromagnetic (VTEM) and Airborne Magnetic Data.To produce the results we performed MVI (Magnetization Vector Inversion) and VTEM inversion through VOXI to generate Susceptibility, Magnetization Vector and Conductivity models and Self-Organizing Maps to also characterize the magnetization domains for the entire area.With these products, we were able to analyze, integrate and better interpret the known orebodies and identify new targets.C3 C2 C1 C4 C3 T05 C2 C1 C4 T04 C3 T05 C2 C1 C4 T04

10.22564/16cisbgf2019.227

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Citations (1)

Geoelectrical Studies by VES/TDEM Joint Inversion in the Parana Sedimentary Basin, Brazil

Proceedings (2014)

Jorge Luís Porsani David Nakamura Leite Cassiano Antônio Bortolozo Marco Antônio Couto Julian David Realpe Campaña

Summary In this work the authors shows results of VES/TDEM joint inversion for Urupês region, located in Paraná basin, São Paulo State, Brazil. The objectives were to map the sedimentary and crystalline aquifers. The sedimentary aquifer is characterized by Adamantina Formation (Bauru aquifer) and the crystalline aquifer is characterized by fractures zones in the basalt layers of the Serra Geral Formation. The joint inversion results are promising and they permit to map the tick of the Adamantina Formation, as well as locate a fracture zones inside of the basalt layer of the Serra Geral Formation.

10.3997/2214-4609.20142017

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Citations (1)

Geoelectrical characterization by joint inversion of VES/TEM in Paraná basin, Brazil

AGU Fall Meeting Abstracts (2012)

Cassiano Antônio Bortolozo Marco Antônio Couto Emerson Rodrigo Almeida Jorge Luís Porsani F. M. Santos

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Citations (2)

Geoelectrical characterization using joint inversion of VES/TEM data: A case study in Paraná Sedimentary Basin, São Paulo State, Brazil

Journal of Applied Geophysics (2014)

Cassiano Antônio Bortolozo Marco Antônio Couto Jorge Luís Porsani Emerson Rodrigo Almeida Fernando A. Monteiro Santos

10.1016/j.jappgeo.2014.09.009

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Citations (21)