Genetic typication of boxites of the Futa province of Jallon-Mandingo (West Africa) by textural and structural features

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

In the process of the formation of classical lateritic bauxites in the Futa Jallon-Mandingo province, due to a complex of two-three-stage genesis, different lithological and genetic types of bauxites were formed in external characteristics, color, texture, structure. The proposed genetic typification of bauxite, based on the textural and structural features of the rocks, in fact is the basis for the geological and industrial classification of deposits of the region. Studying the textural and structural features of bauxites is the only way through which one can get an idea of the conditions of their formation. It is in the textures and structures of ores their genetic history is imprinted. The analysis shows that the deposits, within which deposits of sedimentary-lateritic and chemically transformed bauxites predominate, are distinguished not only by greater thicknesses of ore bodies and a significantly higher content of total alumina in the ores, but also by increased contents of monohydrate forms. This also determines various economic indicators of the operation and technology of metallurgical processing of bauxite.

Толық мәтін

Рұқсат жабық

Авторлар туралы

D. Vnuchkov

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: dim89060471812@mail.ru
Ресей, Staromonetny per., 35, Moscow, 119017

N. Boeva

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: boeva@igem.ru
Ресей, Staromonetny per., 35, Moscow, 119017

М. Makarova

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: dim89060471812@mail.ru
Ресей, Staromonetny per., 35, Moscow, 119017

Е. Shipilova

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: dim89060471812@mail.ru
Ресей, Staromonetny per., 35, Moscow, 119017

V. Mamedov

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: dim89060471812@mail.ru
Ресей, Staromonetny per., 35, Moscow, 119017

N. Bortnikov

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: dim89060471812@mail.ru
Ресей, Staromonetny per., 35, Moscow, 119017

Әдебиет тізімі

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Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Schematic arrangement of genetic types of bauxites in the bauxite-bearing profile of the weathering crust: 1 – sedimentary-lateritic, 2 – infiltration-metasomatic, 3 – lateritic (in situ), 4 – ferruginous laterites, 5 – ferriplantites, 6 – parent rocks.

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3. Fig. 2. Examples of bauxites in situ: a – on sedimentary rocks of the Pita Formation, b – on sedimentary rocks of the Telimele Formation, c – on sedimentary rocks of the Devonian, d – on sedimentary rocks of the Faro Formation, d – on sedimentary rocks of the Faro Formation, hornfelsed to varying degrees, e – on igneous rocks of basic composition.

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4. Fig. 3. a – bauxite formed after siltstone, b – bauxite formed after quartz sandstone. Transparent section (nick. +). Gbs – gibbsite, Gth – goethite, SiO2 – quartz.

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5. Fig. 4. Bauxite on dolerite: a – brecciated bauxite, b – apodolerite bauxite of massive texture, c – bauxite of massive texture. Transparent section (Nik. +, Pl – plagioclase, Gbs – gibbsite, Gth – goethite).

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6. Fig. 5. Chemically transformed bauxites in situ: a – white gelomorphic porcelain-like bauxite with oolites, b – gelomorphic aphanitic bauxite that has not retained the features of the original rock, c – bauxite on siltstone-argillite that has retained the structural features of the original rocks.

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7. Fig. 6. Chemically transformed helemorphic bauxite: a – aphanitic structure; b – oolitic structure, c – large gibbsite crystals, d – secondary helephication along a crack. Transparent section (Nik. +, Gbs – gibbsite, SiO2 – quartz, Bhm – boehmite, Gth – goethite, Hem – hematite)

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8. Fig. 7. Sedimentary-lateritic bauxites: a – conglomerate bauxite in the Sangaredi series deposits, b – gravelstone-bauxite in the Sangaredi series deposits, c – sandstone-like bauxite in the Sangaredi series deposits.

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9. Fig. 8. Conglomerate bauxites: a – ferruginous boules with gibbsite rims, b – rounded fragments of apoaleurolite bauxite. Transparent thin section (Nick. +, Gbs – gibbsite, Bhm – boehmite).

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10. Fig. 9. Gravelite-bauxites: a – psamic, bean-detrital bauxite, b – bauxite on silty mudstones. Transparent thin section (Nik. +, Gbs – gibbsite, Gth – goethite, Hem – hematite, Bhm – boehmite).

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11. Fig. 10. Sandstone-like bauxite: fragments of sand and fine gravel size (a); quartz grains in a gibbsite-boehmite mineral mass (b). Transparent thin section (Nik. +, Gbs – gibbsite, Gth – goethite, SiO2 – quartz, Hem – hematite, Bhm – boehmite)

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