Caulinita e caulins de pegmatitos da borborema-seridó nos Estados da Paraíba e Rio Grande do Norte - composições e origem.

Abstract

The studies presented were performed aiming at a better knowledge of the kaolin from the region of Borborema-Seridó (Paraíba and Rio Grande do North, Brazil) and consist of: a detailed presentation of sample preparation for analysis; a brief review of the general geology and pegmatites as well as the pegmatites of the region (some of them kaolinized) followed by description of the pegmatites focused on this research; a mineralogical examination of the kaolinite-serpentine group emphasizing kaolinite and its structure crystallographic with its possible formation processes; a show about the caufin / cauFinita occurrences in the Brazilian Northeast, Brazil and abroad, with its main industrial applications. Then the results of the chemical (ICP-MS) and diffraction (X-RAY) analyzes performed, showing Li, Ti, Cr, Cu, Ba, Sr, Bi, Nb and TI elements found in Alto Boqueirão (ALTO CABEQA) samples. In the end, the work, always accompanied by bibliographic studies, was concluded presenting as possible cause of the formation of the studied kaolin kaolin, surface waters descendants