| Autor: | Francisco Egidio Pinho, Genova Maria Pulz, A. Pizzato Quadros, M. C. Lima e Cunha, C. J. Fernandes, M. Sobral |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Estudios Geológicos. 57 |
| ISSN: | 1988-3250 0367-0449 |
| DOI: | 10.3989/egeol.01571-2123 |
| Popis: | 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 Cuiaba city. The area contains rocks of Aguapei 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. |
| Databáze: | OpenAIRE |
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