Abstract
A large number of mineral deposits are associated with hydrothermal processes, especially auriferous deposits. In such processes, studies on percolating fluids may indicate the presence of potash (K), among other elements. In this study, aerogammaspectrometric data-processing methodologies are evaluated, especially those methods based on the suppression of the primary contribution of potassium, the result of lithological and soil variations, and to environmental conditions. Resulting maps point out the contribution of hydrothermal K. This processing procedure was used because of the association of hydrothermal K and auriferous mineralizations according to the deposit model defined for the studied region. Intensity maps locate the areas with great influence of hydrothermal K. Data integration required to improve a change in the gammaspectrometric data processing in order to positively correlate hydrothermalised areas. Data integration could distinguish high and medium favorable targets for mineral exploration of lode-Au deposits in the studied region.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Adams, J. A. S., and Gasparini, P., 1970., Gamma ray spectrometry of rocks: Elselvier Publ. Co., New York, 295p.
Agterberg, F. P., and Bonham-Carter, G. F., 1999., Logistic regression and weights of evidence modeling in mineral exploration, in Computer Applications in the Mineral Industries: Proc. 28th Intern. Symp. APCOM'99, p. 583–590.
An, P., Moon, W. M., and Rencz, A., 1991, Application of fuzzy set theory for integration of geological, geophysical and remote sensing data: Can. Jour. Exploration Geophysics, v.27, no.1, p. 1–11.
Dickson, B. L., and Scott, K. M., 1997, Interpretation of aerial gamma-ray surveys—adding the geochemical factors: AGSO Jour. Australian Geology & Geophysics, v.17, no.2, p. 187–200
Efimov, A.V., 1978, Multiplikativniyj pokazatel dlja vydelenija endogennych rud aerogamma-spectrometriceskim dannym, in Metody rudnoj geofiziki: Lenigrad, Naucno-proizvodstvennoje objedinenie Geofizica Ed., p. 59–68.
Frey, M., Hunziker, J. C., O'Neil, J. R., and Schwander, H. W., 1976, Equilibrium-disequilibrium relations in the Monte Rosa Granite, Western Alps: petrological, Rb-Sr and stable isotope data: Contr. Mineralogy and Petrology, v.55, no.2, p. 147–179.
Galbraith, J. H., and Saunders, D. F., 1983, Rock classification by characteristics of aerial gamma-ray measurements: Jour. Geochemical Exploration, v.18, no.1 p. 47–73.
Gnojek, I., and Prichystal A., 1985, A new zinc mineralization detected by airborne gamma-ray spectrometry in Northern Moravia (Czechoslovakia):Geoexplorationr, v.23, no.4, p. 491–502.
Hartmann, L. A., Silva, L. C., Remus, M. V. D., Leite, J. A. D., and Philipp, R. P., 1998, Evoluccao Geotectonica do Sil do Brasil e Uruguai entre 3,3 Ga e 470 Ma., in II Congresso Uruguayo de Geologia, Punta del Este, Anais, p. 277–284.
Hoover, D. B., and Pierce, H. A., 1990, Annotated bibliography of gamma-ray methods applied to gold exploration: U.S. Geol. Survey Open-File Rept. 90–203, 23 p.
I. A. E. A. Report, Exploranium, 1991, 'Airborne gamma-ray spectrometer surveying: Tech. Rept. 323, 122p.
Matheron, G., 1963, Principles of geostatistics: Econ. Geology, v.58, no.8, p. 1246–1266
Naylor, M. A., Mandl, G., and Supesteijn, C. H. K., 1986, Fault geometries in basement-induced wrench faulting under different initial stress states: Jour. Structural Geology, v.8, no.7, p. 737–752.
Pires, A. C. B., 1995, Identificaccao Geofisica de Areas de Alteraccao Hidrotermal, Crix 'as-Guarinos, G'oias: Revista Brasileira de Geociencias, v.25, no.1, p. 61–68.
Quadros, T. F. P. de, 1995, Geologia e génese do depósito aurífero da Mina San Gregorio. Dissertaçoã de Mestrado, Curso de Poãs-graduaçoã em Geociéncias: Universidade Federal do Rio Grande do Sul, Porto Alegre, 196p.
Quadros, T. F. P. de, 2000, Integraçoã de dados para pesquisa mineral de ouro em ambiente SIG na Ilha Cristalina de Rivera, Uruguai. Tese de Doutoramento, PPGEM, Escola de Engenharia: Universidade Federal do Rio Grande do Sul, PortoAlegre, 260p.
Quadros, T. F. P. de Koppe, J C., Strieder, A. J., and Costa, J. F. C. L., 2002, Arcabouco Estrutural da Ilha Cristalina de Rivera esua implicação na potencialidade mineral: REM Revista da Escola de Minas de Ouro Preto, v.55, no 1, p. 65–71.
Saunders, D. F., Branch, J. F., and Thompsom, C. K., 1994, Tests of Australian aerial radiometric data for use in petroleum reconnaissance: Geophysics, v.59, no.3, p. 411–419.
Saunders, D. F., Terry, S. A., and Thompsom, C. K., 1987, Test of National Uranium Resource Evaluation gamma-ray spectral data in petroleum reconnaissance: Geophysics, v.52, no.11, p. 1547–1556.
Saunders, D. F., Burson, K. R., Branch, J. F., and Thompsom, C. K., 1993, Relation of thorium-normalizaded surface and aerial radiometric data to subsurface petroleum accumulations: Geophysics, v.58, no.10, p. 1417–1427.
Shives, R. B. K., Charbonneau, B. K., and Ford, K. L., 1997, The detection of potassic alteration by gamma ray recognition of alteration related to mineralization, in Exploration 97, Fourth Decennial Intern. Conf. Mineral Exploration, (Toronto, Canada), p. 345–353.
Soliani Jr. E., 1986, Os dados geocronoloãgicos do Escudo Sul-riograndense e suas implicações de ordem geotectô.nica. Tese de Doutoramento: Curso de Pós-Graduação em Geociência, IGnUSP, São Paulo, 298p.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
de Quadros, T.F.P., Koppe, J.C., Strieder, A.J. et al. Gamma-Ray Data Processing and Integration for Lode-Au Deposits Exploration. Natural Resources Research 12, 57–65 (2003). https://doi.org/10.1023/A:1022608505873
Issue Date:
DOI: https://doi.org/10.1023/A:1022608505873