Geochemical studies on the formation of iron-manganese nodules and crusts in recent basins I. Eningi-Lampi lake, Central Karelia /
The processes of formation of iron-manganese nodules and crusts have been studied on an example of the Eningi-Lampi lake, Central Karelia, where the relationships between the source of the ore, sedimentary materials and areas of their accumulation prove relatively simple and apparent. Nodules and cr...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
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University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1972
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| Sorozat: | Acta mineralogica-petrographica
20 No. 2 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24552 |
| Tartalmi kivonat: | The processes of formation of iron-manganese nodules and crusts have been studied on an example of the Eningi-Lampi lake, Central Karelia, where the relationships between the source of the ore, sedimentary materials and areas of their accumulation prove relatively simple and apparent. Nodules and crusts are composed mostly by birnessite, amorphous hydrous ferric oxides and hydro-goethite. They occur, as a rule, on the surface of relatively coarse-grained sediments, at the ground-water interface. Considerably in a lesser extent are found the nodules in the upper part (0—5 cm) of the red-brown flooded watery mud covering dark-green, black muds. The nucleus of nodules, or the basis of crusts of iron-manganese hydroxides are various, frequently altered, fragments of rocks, sometimes pieces of wood. Distribution of Mn and Fe in sediments and Mn waters of the lake is considered. It is shown that -pr- ratio considerably decreases in waters, sediments and nodules of the lake with the moving off the source. The main role in the process of formation of iron-manganese nodules belongs to the selective chemosorption interaction (with autocatalytic oxidation) of component-bearing solutions with active surfaces. |
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| Terjedelem/Fizikai jellemzők: | 363-381 |
| ISSN: | 0365-8066 |