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Aschan, Joh:s (1906): (Tables, page 17-18) Chemical composition of ferromanganese concretions of the lakes of Northern Savolax in Eastern Finland. PANGAEA,, Supplement to: Aschan, J (1906): Om några förekomster af manganrik sjömalm i norra Savolax = On occurrences of enrichment in managanese in the lake ores of Savolax (Eastern Finland). original at, Teknikern, 456, 78-80, hdl:10013/epic.45961.d001

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This paper discusses the occurrence of manganese-rich concretions in the lakes of Northern Savolax in Eastern Finland. The samples were collected in the summer of 1905 and left to dry for 2 months at room temperature. The quantity of H2O mentionned in the analysis was obtained by dessication at 155°C. The amount of Mn is calulated as MnO2 although other valences might be present in the samples. The contents in CO2 and organic substances was not determined. J. Aschan determined that as a general rule, in Finland the manganese rich lake deposits are rather associated with soft bottom sediments while the iron rich deposits are more assocaited with hard or sandy bottoms.
Source data set:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA,
Further details:
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA,
Median Latitude: 63.152059 * Median Longitude: 27.581768 * South-bound Latitude: 61.347250 * West-bound Longitude: 27.222730 * North-bound Latitude: 63.567660 * East-bound Longitude: 29.214640
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
Kilpijarvi_A * Latitude: 63.567430 * Longitude: 27.227670 * Elevation: 86.0 m * Lake water depth: 5 m * Location: Finland * Method/Device: Dredge (DRG)
Kirmajarvi_A * Latitude: 63.480800 * Longitude: 27.308530 * Elevation: 84.0 m * Lake water depth: 5 m * Location: Finland * Method/Device: Dredge (DRG)
Nerkoonjarvi_A * Latitude: 63.462720 * Longitude: 27.273540 * Elevation: 86.0 m * Lake water depth: 16 m * Location: Finland * Method/Device: Dredge (DRG)
Samples have been dried at 155°C in order to evaluate the contents in H2O.Depth of lake see Event(s) information.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventAschan, Joh:s
2Latitude of eventLatitudeAschan, Joh:s
3Longitude of eventLongitudeAschan, Joh:s
4Elevation of eventElevationmAschan, Joh:s
5DEPTH, sediment/rockDepthmAschan, Joh:sGeocode
6IdentificationIDAschan, Joh:sof Aschan
7Iron oxide, Fe2O3Fe2O3%Aschan, Joh:sWet chemistry
8Manganese dioxideMnO2%Aschan, Joh:sWet chemistry
9Silicon dioxideSiO2%Aschan, Joh:sWet chemistry
10Aluminium oxideAl2O3%Aschan, Joh:sWet chemistry
11Calcium oxideCaO%Aschan, Joh:sWet chemistry
12Magnesium oxideMgO%Aschan, Joh:sWet chemistry
13Phosphorus oxideP2O5%Aschan, Joh:sWet chemistry
14Water content, wet massWater wm%Aschan, Joh:sWet chemistry
15Deposit typeDeposit typeAschan, Joh:s
16Area/localityAreaAschan, Joh:s
186 data points

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