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Characteristics of some weathering products of chromitic ultrabasic rocks in Bahia state, Brazil : nontronites, chlorites and chromiferous talc
| Content Provider | Semantic Scholar |
|---|---|
| Author | Besnus, Yves Fusil, Ginette Janot, Christian Pinta, Maurice Sieffermann, Gaston |
| Copyright Year | 1975 |
| Abstract | The study concems weathering products derived from chromite-rich dunites in the region of Campo- Formoso. In the zone where the weathered rock retains its initial structure, brown, pink and green colors predomi- nate; they are closely related with the presence of weathering-produced iron and chrome sili?ates. The climate of this area of moderate altitude is tropical with a rainfall of 880 mm. About fifty samples have been collected and studied by chemical analysis, atomic absorption, direct reading The most salient clay minerals are: spectrometry, X-ray diffraction, electron microscopy and Mbssbauer spectrometry. I. a pink chromiferous chlorite, containing about 8 '96 of CIO, in the form of Cr6 +; 2. bright green coloured chromiferous nonlronite containing up to 1 I ?'I Cr&; 3. other minerals showing a much lower content of chromium: a 1 ?6 Cra, talc, anda I % Cr@,chrysotile. The main conclusion that can be drawn from this study is that high-& clay minerals can be found in the field. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34364.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
