Varentsov, Igor M (1972): Analysis of Mn-deposits from Lake Eningi-Lampi. PANGAEA, https://doi.org/10.1594/PANGAEA.855333, Supplement to: Varentsov, IM (1972): Geochemical studies on the formation of iron-manganese nodules and crusts in recent basins, I. Eningi-Lampi Lake, Central Karelia. Acta Mineralogica-Petrographica, Szeged, XX/2, 363-381, hdl:10013/epic.46293.d001
Always quote above citation when using data! You can download the citation in several formats below.
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 (0ó5 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 waters of the lake is considered. It is shown that the Mn/Fe ratio decreases considerably in waters, sediments and nodules of the lake while moving off a distance from the source. The main role in the process of formation of iron-manganese nodules belongs to the selective chemosorption interaction (with auto-catalytic oxidation) of component-bearing solutions with active surfaces.
Source data set:
Fig. 9a-1 Quarzite pebble coated with Fe-Mn hydroxides, thickness to 103 mm. In bottom of channel, connecting the Lakes Eningi-Lampi and Seletskoe Ozeru
Fig. 9a-3 Pebble of altered basic volcanite coated by Fe-Mn hydroxides. The upper part rising above the water-sediment interface is covered with a crust thickness to 25-40 mm thick. Part in sediment has no crust
Fig. 9b-1 Photomicrograph. The core of a nodule is a gravel fragment of quarzite covered by a layer of Fe-Mn hydroxides around which developed a mixture of Fe-Mn hydroxides and patches of chlorite-like mineral
Median Latitude: 62.564442 * Median Longitude: 33.690297 * South-bound Latitude: 62.036410 * West-bound Longitude: 33.195860 * North-bound Latitude: 63.119070 * East-bound Longitude: 34.149040
Datasets listed in this publication series
- Varentsov, IM (1972): (Table 3-VI, page 67 in Marine Manganese Deposits, Edited by G. P. Glasby, 1977), Chemical composition of lacustrine ferromanganese concretions from Lake Eningi-Lampi. https://doi.org/10.1594/PANGAEA.854651
- Varentsov, IM (1972): (Table 4, page 381), Chemical composition of lacustrine ferromanganese concretions and crusts from Lake Eningi-Lampi. https://doi.org/10.1594/PANGAEA.855332