Zobrazeno 1 - 10
of 111
pro vyhledávání: '"T. Koljonen"'
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 58, Iss 2, Pp 53-58 (1986)
Externí odkaz:
https://doaj.org/article/8b0d05dbac6f4813a48f774a9179c2da
Autor:
T. Koljonen, R.J. Rosenberg
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 47, Iss 1-2, Pp 127-138 (1975)
The contents of rare earth elements (REE) have been determined in five Svecofennian metamorphosed volcanic rocks and are compared with those found in the Karelian zone and Recent tholeiites. In the Svecofennian zone, REE contents in low silica volcan
Externí odkaz:
https://doaj.org/article/b429c086c76d4967bae407b944f324b3
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 49, Iss 2, Pp 159-173 (1977)
A study was made of the mineral and chemical composition of a concentric precipitate formed around a ground-water discharge, where manganese had precipitated before iron. Birnessite was identified in the Mn-rich precipitate and goethite and lepidocro
Externí odkaz:
https://doaj.org/article/d7c7c89846bd4c34a4b20f591419ef9e
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 46, Iss 1, Pp 15-21 (1974)
Almost 100 sediments, mostly Finnish, have been analyzed for selenium. Tentative values for the average selenium contents of the various groups are given. The distribution of the element in the sediments studied is interpreted as follows. During weat
Externí odkaz:
https://doaj.org/article/38c4af4d757f4d2ea55ecee568e09daf
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 45, Iss 2, Pp 107-117 (1973)
The selenium contents of Precambrian metamorphic rocks from Finland were studied and tentative averages are presented. The pattern of the distribution of selenium in metamorphic rocks can be summarized as follows: Selenium most probably does not ente
Externí odkaz:
https://doaj.org/article/20dff1e518e247e69a023b88469746b8
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 47, Iss 1-2, Pp 175-181 (1975)
Spherically layered ferruginous concretions formed in soils in Finland are described. The cementing iron-rich material is in an amorphic state and binds the loose detrital mineral grains of quartz, feldspars, amphiboles, etc. Electron microprobe anal
Externí odkaz:
https://doaj.org/article/76ec5ff7463d4dd3bbdeabc543139a42
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 46, Iss 2, Pp 133-138 (1974)
Selenium is very mobile in the conditions under which granitic rocks are crystallized and is depleted in silicic plutonic rocks and in pegmatites. It tends to separate from magma and be enriched into gaseous phase. The concentrations found in migmati
Externí odkaz:
https://doaj.org/article/c2c2cec9d9ba4d4c9bdf5bb2b488803a
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 47, Iss 1-2, Pp 25-31 (1975)
Selenium content is high and the S/Se ratio low in the economically most important sulfide ores which are situated in the Svecokarelian schist belt. The S/Se ratio is like that in Middle Precambrian (1.4–2.5 Ga) Svecokarelian carbonaceous and argil
Externí odkaz:
https://doaj.org/article/5a09bb2a7863456db0a428cbe3746f39
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 49, Iss 2, Pp 85-88 (1977)
Selenium is always present in sulphide ores and can be used as an indicator element in the geochemical exploration of those ores. Being an anion selenium also gives information, e.g., about ore type, that cannot be obtained through the analysis of ca
Externí odkaz:
https://doaj.org/article/03f5a205e7e54505877f54a5eb11e450
Autor:
T. Koljonen
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 45, Iss 2, Pp 119-123 (1973)
The selenium contents of some sedimentary rocks were studied and tentative averages are presented. The distribution pattern of selenium in sedimentary rocks can be summarized as follows: The highest contents are found in clayey sediments (excluding p
Externí odkaz:
https://doaj.org/article/8563e6657e1b45e597e3c952aac75a64