Unknown
PANGAEA
In:
Supplement to: Winterhalter, Boris (1966): Pohjanlahden ja Suomenlahden rauta-mangaani-saostumista. Summary: Iron-manganese concretions from the gulf of Bothnia and the gulf of Finland. Geoteknillisiä julkaisuja - Geotekniska meddelanden - Geotechnical publications, 69, 77 pp, https://tupa.gtk.fi/julkaisu/geoteknillinen/gt_s_069.pdf
Publication Date:
2023-08-28
Description:
Iron-manganese concretions, closely related to lacustrine ores and deep sea manganese nodules, are presently forming in different parts of Gulfs of Bothnia and Finland. They can be divided according to physical form into three distinct groups: (1) round pea-shaped concretions, (2) ring-shaped concrections, and (3) flat sheets and crusts of concretionary material. A definite correlation was found to exist between the form i.e. type of concretions and their chemical composition (Mn/Fe ratio). Trace element concentrations were generally rather high, although not as high as in deep sea manganese nodules. X-ray and DTA was used to study the mineralogy and crystal structure of the concretions. Surface concentrations and geographical distribution of the concretions were estimated on the basis of samples, diving observations and echo-grams.
Keywords:
NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
Type:
Dataset
Format:
application/zip, 4 datasets
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