Geophysical study of the Sertãozinho, Rio Aguapeí and Nova anomalies (SW of Mato Grosso, Brazil)

Ribeiro, Vanessa Biondo; Louro, Vinicius Hector Abud; Mantovani, Marta Sílvia Maria

doi:10.1190/sbgf2013-146

13th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 26–29 August 2013 2013

DOI: 10.1190/sbgf2013-146

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Geophysical study of the Sertãozinho, Rio Aguapeí and Nova anomalies (SW of Mato Grosso, Brazil)

Vanessa Biondo Ribeiro¹,

Vinicius Hector Abud Louro²,

Marta Sílvia Maria Mantovani³

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Cited by 3 publications

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Magnetic field analysis of Morro do Leme nickel deposit

2014

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The Morro do Leme laterite nickel deposit lies inside the western border of the Parecis Basin (Brazil). This deposit is characterized by high concentrations of lateritic Ni (about 1.8%) and anomalous contents of Pd, Au, Cu, Na, Co, Zn, and Pt in a peridotite and dunite layered intrusion. Besides the existence of geochemical and drilling data, the 3D distribution in the subsurface of this layered intrusion is still unknown. An airborne magnetic survey revealed three east–west elongated magnetic anomalies, characterized by a significant remanent magnetization. The sources of these anomalies were delimitated laterally and had their depths estimated between 90 and 150 m, using techniques that use derivatives. Further, the total magnetization direction was obtained from a distortion analysis of the magnetic anomalies. All these data were united in an initial model for the 3D inversion of the magnetic data. The total and induced magnetization directions were attributed to the inverted model of 0.12 (SI) susceptibility, allowing indirect estimation of the remanence. The model, defined by the depth, the inversion, and the remanence estimates, linked the intrusion to analogue events in the Rondonian-San Ignácio Province. The results indicated that to explore for laterite Ni, the best locations are the southern part of the main anomaly and in the cover above the two smaller anomalies, whereas to explore for Pd, Au, Cu, Na, Co, Zn, and/or Pt, the indicated region is the central portion of the main anomaly.

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Magnetic field analysis of Morro do Leme nickel deposit

2014

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Application of Geophysical Methods in the Identification of Mineralized Structures and Ranking of Areas for Drilling as Exemplified by Alto Guaporé Orogenic Gold Province

Echague,

Leão-Santos,

Melo

et al. 2024

Minerals

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Mineral exploration works conducted in the Alto Guaporé Gold Province (AGGP), situated in the southwest region of the Amazon Craton in Brazil, faces the challenges of many gold provinces around the world, i.e., declines in the discoveries of new economic deposits and increases in exploration costs. Ground geophysical methods, combined with structural analyses and geological mapping, are valuable tools that have potential to improve accuracy in selecting exploration targets and in determining drilling locations. AGGP deposits are primarily associated with regional N20°–W50° inverse faulting and sheared geologic contacts between Meso-Neoproterozoic siliciclastic metasedimentary rocks and Mesoproterozoic basement (granite and volcano–sedimentary sequences). Mining currently occurring in the central portion of the province drives exploration works towards the many existing targets at the area. Among them, the ABP target is one of the most promising for being located few kilometers north of the Pau-a-Pique mine. At the ABP target, gold is associated with hydrothermal alteration located in the sheared contacts and in the hinge zone of folded metasedimentary sequence. Hydrothermal phases include Fe-oxides, sulfide (py), muscovite and quartz veins. In this study, we use magnetic and geoelectric (induced polarization) surveys coupled with structural and geological mapping to identify potential footprints within the ABP target. The results from induced polarization (IP) profiles successfully mapped the shape and orientation of the main structures down to approximately 350 m at the ABP target, indicating potential locations for hydrothermal alteration hosting gold. Additionally, 3D magnetic data inversions illustrated the distribution of magnetic susceptibilities and magnetization vectors associated with shear zone structures and isolated magnetic bodies. Magnetic data highlighted fault zones along the contacts between metamorphic rocks and granites, while IP data identified areas with high chargeability, correlating with sulfidation zones mineralized with gold. These findings suggest a metallogenic model where gold deposits are transported through deep structures connected to regional faults, implying significant tectonic and structural control over gold deposition. The results underscore the potential of multiparameter geophysics in identifying and characterizing deposits in both deep and strike, thereby advancing our understanding of mineral occurrences in the region and enhancing the search for new mineralized zones.

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Gamaespectrometria De Um Lixão Desativado

et al. 2014

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O presente trabalho foi desenvolvido em um lixão desativado do município de Lages-SC durante o ano de 2014. Foram quantificadas as concentrações dos elementos radioativos (Urânio, Tório e Potássio). O lixão desativado do município de Lages-SC localizado entre as coordenadas 27º46´15,38’’S e 50º15´10,92’’O em uma área de 48.000 m2 com extensa rede de drenagem, cujo entorno encontram-se áreas de proteção permanente e reflorestamentos com pinus. Efetuou-se a aquisição de dados gamaespectrométricos com o aparelho Pico Envirotec PGIS-2 em cinco células onde se encontram depositados os resíduos sólidos objetivando detectar a presença dos elementos radioativos: (40K; 232Th; 238U) que apresentaram valores máximos e coeficiente de variação respectivamente: 40K (7,342x10-5 ppm; 43,1%); 232Th (8,43 ppm; 96,4%) e 238U (0,7 ppm; 93,4%).

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Geophysical study of the Sertãozinho, Rio Aguapeí and Nova anomalies (SW of Mato Grosso, Brazil)

Cited by 3 publications

References 5 publications

Magnetic field analysis of Morro do Leme nickel deposit

Magnetic field analysis of Morro do Leme nickel deposit

Application of Geophysical Methods in the Identification of Mineralized Structures and Ranking of Areas for Drilling as Exemplified by Alto Guaporé Orogenic Gold Province

Gamaespectrometria De Um Lixão Desativado

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