Prospeccion biogeoquimica del oro en el yacimiento de Pau-a-Pique, Estado de Mato Grosso, Brasil

M. C. Lima e Cunha; G. M. Pulz; C. J. Fernandes; F. E. Pinho; A. Pizzato Quadros; M. Sobral

doi:10.3989/egeol.01571-2123

Prospeccion biogeoquimica del oro en el yacimiento de Pau-a-Pique, Estado de Mato Grosso, Brasil

Authors

M. C. Lima e Cunha Centro de Estudios em Petrologia e Geoquímica-CPGq. Instituto de Geociencias. Universidade Federal do Rio Grande do Sul.
G. M. Pulz Centro de Estudios em Petrologia e Geoquímica-CPGq. Instituto de Geociencias. Universidade Federal do Rio Grande do Sul.
C. J. Fernandes Centro de Estudios em Petrologia e Geoquímica-CPGq. Instituto de Geociencias. Universidade Federal do Rio Grande do Sul.
F. E. Pinho Instituto de Ciencias Exatas e da Terra. Departamento de Geologia. Universidade Federal do Mato Grosso
A. Pizzato Quadros Instituto de Ciencias Exatas e da Terra. Departamento de Geologia. Universidade Federal do Mato Grosso.
M. Sobral Faculdade de Farmácia. Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.3989/egeol.01571-2123

Keywords:

Gold, hiogeochemistry, soil geochemistry, tropical environment

Abstract

During the dry season (July-August 1997) eleven samples of soil-plant pairs were collected in the Pau-a-Pique gold deposit, southwestern of Amazonic Craton, about 440 km NW of Cuiabá city. The area contains rocks of Aguapeí Group, Rondonian Belt and recent cover. The area has a steep relief covered by thin soils. The vegetation is sparse and predominantly composed of xerophitic shrubs. Two kinds of plant species were sampled, one belonging to the Annonaceae family and the other one to the Piperaceae family. The ashes of these plants and the soils were analysed by INAA and ICP. The highest gold contents are found in the ashes of plants collected in the colluvium soil (white mica, clay minerals and Fe-oxyhydroxides) covering the hydrothermal halo of the deposit. In the soil, the highest gold values are those from eluvium related to the quartz veins. The higher gold values in plants respect to the soils suggest that the plants could be useful to establish hydrothermal targets.

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Published

2001-04-30

How to Cite

Lima e Cunha, M. C., Pulz, G. M., Fernandes, C. J., Pinho, F. E., Pizzato Quadros, A., & Sobral, M. (2001). Prospeccion biogeoquimica del oro en el yacimiento de Pau-a-Pique, Estado de Mato Grosso, Brasil. Estudios Geológicos, 57(1-2), 3–13. https://doi.org/10.3989/egeol.01571-2123

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Issue

Vol. 57 No. 1-2 (2001)

Section

Articles

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